./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrcpy-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_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/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_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrcpy-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/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_aab85c93-f3ab-4879-8118-2bdc099f256b/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 4b6873ae1a0d665798beb3dd9c0c48e89806da7dd46f1d2066800a52e0a2aa51 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:54:37,247 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:54:37,250 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:54:37,304 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:54:37,305 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:54:37,309 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:54:37,311 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:54:37,314 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:54:37,317 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:54:37,323 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:54:37,324 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:54:37,327 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:54:37,327 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:54:37,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:54:37,333 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:54:37,342 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:54:37,345 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:54:37,346 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:54:37,349 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:54:37,359 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:54:37,361 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:54:37,363 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:54:37,367 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:54:37,368 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:54:37,379 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:54:37,380 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:54:37,380 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:54:37,383 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:54:37,383 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:54:37,385 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:54:37,386 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:54:37,387 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:54:37,389 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:54:37,391 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:54:37,393 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:54:37,393 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:54:37,394 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:54:37,394 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:54:37,395 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:54:37,396 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:54:37,397 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:54:37,398 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-21 00:54:37,447 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:54:37,453 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:54:37,455 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:54:37,455 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:54:37,456 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:54:37,457 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:54:37,457 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:54:37,457 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:54:37,457 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:54:37,458 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:54:37,459 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:54:37,459 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:54:37,460 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:54:37,460 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:54:37,460 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:54:37,460 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:54:37,461 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:54:37,461 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:54:37,462 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-21 00:54:37,462 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-21 00:54:37,462 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:54:37,463 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:54:37,463 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 00:54:37,465 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:54:37,465 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:54:37,465 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:54:37,465 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-21 00:54:37,466 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-21 00:54:37,466 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-21 00:54:37,466 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:54:37,467 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-21 00:54:37,467 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:54:37,467 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:54:37,468 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:54:37,468 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:54:37,468 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:54:37,468 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:54:37,469 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:54:37,469 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:54:37,469 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:54:37,469 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:54:37,470 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:54:37,470 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_aab85c93-f3ab-4879-8118-2bdc099f256b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4b6873ae1a0d665798beb3dd9c0c48e89806da7dd46f1d2066800a52e0a2aa51 [2021-11-21 00:54:37,797 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:54:37,829 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:54:37,832 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:54:37,834 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:54:37,835 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:54:37,836 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-memsafety/openbsd_cstrcpy-alloca-2.i [2021-11-21 00:54:37,898 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/data/aaf5b8703/097bbc7caa854a07b9aa15dedd6914d0/FLAGb649ba375 [2021-11-21 00:54:38,401 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:54:38,402 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/sv-benchmarks/c/array-memsafety/openbsd_cstrcpy-alloca-2.i [2021-11-21 00:54:38,439 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/data/aaf5b8703/097bbc7caa854a07b9aa15dedd6914d0/FLAGb649ba375 [2021-11-21 00:54:38,709 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/data/aaf5b8703/097bbc7caa854a07b9aa15dedd6914d0 [2021-11-21 00:54:38,712 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:54:38,714 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:54:38,715 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:54:38,716 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:54:38,722 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:54:38,723 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:54:38" (1/1) ... [2021-11-21 00:54:38,724 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e23a551 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:38, skipping insertion in model container [2021-11-21 00:54:38,724 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:54:38" (1/1) ... [2021-11-21 00:54:38,735 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:54:38,783 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:54:39,157 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:54:39,168 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:54:39,221 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:54:39,261 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:54:39,262 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39 WrapperNode [2021-11-21 00:54:39,262 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:54:39,263 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:54:39,264 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:54:39,264 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:54:39,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,301 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,333 INFO L137 Inliner]: procedures = 117, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2021-11-21 00:54:39,334 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:54:39,335 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:54:39,335 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:54:39,335 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:54:39,344 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,344 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,359 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,359 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,366 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,385 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,387 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,390 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:54:39,391 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:54:39,391 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:54:39,391 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:54:39,398 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (1/1) ... [2021-11-21 00:54:39,406 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:54:39,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:54:39,429 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:54:39,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:54:39,470 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:54:39,470 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:54:39,470 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:54:39,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:54:39,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:54:39,471 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:54:39,556 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:54:39,558 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:54:39,727 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:54:39,790 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:54:39,790 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 00:54:39,793 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:54:39 BoogieIcfgContainer [2021-11-21 00:54:39,793 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:54:39,794 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:54:39,794 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:54:39,798 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:54:39,798 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:54:38" (1/3) ... [2021-11-21 00:54:39,810 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@620372e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:54:39, skipping insertion in model container [2021-11-21 00:54:39,810 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:39" (2/3) ... [2021-11-21 00:54:39,810 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@620372e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:54:39, skipping insertion in model container [2021-11-21 00:54:39,811 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:54:39" (3/3) ... [2021-11-21 00:54:39,812 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrcpy-alloca-2.i [2021-11-21 00:54:39,818 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:54:39,818 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 9 error locations. [2021-11-21 00:54:39,886 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:54:39,893 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 00:54:39,894 INFO L340 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2021-11-21 00:54:39,908 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 10 states have (on average 2.3) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 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 00:54:39,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:54:39,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:39,916 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:54:39,916 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:39,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:39,922 INFO L85 PathProgramCache]: Analyzing trace with hash 105340, now seen corresponding path program 1 times [2021-11-21 00:54:39,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:39,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339603065] [2021-11-21 00:54:39,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:39,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:40,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:40,125 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 00:54:40,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:40,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339603065] [2021-11-21 00:54:40,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339603065] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:40,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:40,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:54:40,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066714742] [2021-11-21 00:54:40,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:40,135 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:54:40,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:40,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:54:40,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:54:40,169 INFO L87 Difference]: Start difference. First operand has 20 states, 10 states have (on average 2.3) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 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 00:54:40,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:40,221 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-11-21 00:54:40,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:54:40,223 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 00:54:40,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:40,231 INFO L225 Difference]: With dead ends: 21 [2021-11-21 00:54:40,232 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 00:54:40,233 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 00:54:40,237 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:40,238 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 20 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:40,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 00:54:40,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-21 00:54:40,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 10 states have (on average 2.0) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 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 00:54:40,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-21 00:54:40,271 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 3 [2021-11-21 00:54:40,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:40,272 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-21 00:54:40,272 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 00:54:40,272 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-21 00:54:40,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:54:40,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:40,273 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:54:40,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:54:40,274 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:40,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:40,275 INFO L85 PathProgramCache]: Analyzing trace with hash 3267810, now seen corresponding path program 1 times [2021-11-21 00:54:40,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:40,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488128096] [2021-11-21 00:54:40,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:40,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:40,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:40,333 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 00:54:40,333 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:40,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488128096] [2021-11-21 00:54:40,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488128096] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:40,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:40,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:54:40,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613432642] [2021-11-21 00:54:40,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:40,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:54:40,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:40,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:54:40,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:54:40,338 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 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 00:54:40,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:40,369 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-11-21 00:54:40,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:54:40,370 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 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 00:54:40,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:40,371 INFO L225 Difference]: With dead ends: 17 [2021-11-21 00:54:40,371 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 00:54:40,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:54:40,374 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 13 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:40,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 6 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:40,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 00:54:40,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 00:54:40,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.8) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 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 00:54:40,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-11-21 00:54:40,380 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 4 [2021-11-21 00:54:40,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:40,380 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-11-21 00:54:40,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 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 00:54:40,381 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-11-21 00:54:40,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:54:40,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:40,382 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:54:40,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:54:40,382 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:40,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:40,383 INFO L85 PathProgramCache]: Analyzing trace with hash 3267811, now seen corresponding path program 1 times [2021-11-21 00:54:40,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:40,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383409833] [2021-11-21 00:54:40,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:40,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:40,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:40,558 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 00:54:40,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:40,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383409833] [2021-11-21 00:54:40,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383409833] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:40,559 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:40,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:54:40,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605497896] [2021-11-21 00:54:40,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:40,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:54:40,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:40,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:54:40,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:54:40,561 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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 00:54:40,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:40,613 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2021-11-21 00:54:40,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:54:40,616 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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 00:54:40,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:40,617 INFO L225 Difference]: With dead ends: 16 [2021-11-21 00:54:40,617 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 00:54:40,617 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:54:40,619 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 16 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:40,620 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 4 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:40,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 00:54:40,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-21 00:54:40,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 10 states have (on average 1.7) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 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 00:54:40,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-21 00:54:40,625 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 4 [2021-11-21 00:54:40,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:40,625 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-21 00:54:40,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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 00:54:40,626 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-21 00:54:40,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:54:40,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:40,627 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:54:40,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:54:40,627 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:40,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:40,628 INFO L85 PathProgramCache]: Analyzing trace with hash 3266345, now seen corresponding path program 1 times [2021-11-21 00:54:40,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:40,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35252156] [2021-11-21 00:54:40,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:40,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:40,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:40,787 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:54:40,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:40,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35252156] [2021-11-21 00:54:40,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35252156] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:40,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:40,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:54:40,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056537740] [2021-11-21 00:54:40,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:40,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:54:40,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:40,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:54:40,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:54:40,795 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) 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 00:54:40,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:40,892 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2021-11-21 00:54:40,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:54:40,893 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) 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 00:54:40,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:40,894 INFO L225 Difference]: With dead ends: 29 [2021-11-21 00:54:40,895 INFO L226 Difference]: Without dead ends: 29 [2021-11-21 00:54:40,895 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 00:54:40,897 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 13 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:40,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 14 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:54:40,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-21 00:54:40,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 18. [2021-11-21 00:54:40,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 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 00:54:40,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-11-21 00:54:40,912 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 4 [2021-11-21 00:54:40,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:40,912 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-11-21 00:54:40,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) 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 00:54:40,913 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-11-21 00:54:40,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:54:40,913 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:40,914 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:54:40,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:54:40,914 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:40,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:40,919 INFO L85 PathProgramCache]: Analyzing trace with hash 101303240, now seen corresponding path program 1 times [2021-11-21 00:54:40,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:40,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940504506] [2021-11-21 00:54:40,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:40,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:40,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:40,979 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 00:54:40,980 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:40,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940504506] [2021-11-21 00:54:40,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940504506] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:40,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:40,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:54:40,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010279226] [2021-11-21 00:54:40,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:40,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:54:40,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:40,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:54:40,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:54:40,984 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 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 00:54:41,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:41,013 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2021-11-21 00:54:41,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:54:41,014 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 00:54:41,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:41,014 INFO L225 Difference]: With dead ends: 17 [2021-11-21 00:54:41,015 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 00:54:41,015 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:54:41,017 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 6 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:41,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 8 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:41,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 00:54:41,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 00:54:41,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.5833333333333333) 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 00:54:41,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-11-21 00:54:41,022 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 5 [2021-11-21 00:54:41,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:41,023 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-11-21 00:54:41,023 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 00:54:41,024 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-11-21 00:54:41,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:54:41,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:41,025 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:54:41,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:54:41,025 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:41,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:41,026 INFO L85 PathProgramCache]: Analyzing trace with hash 101303241, now seen corresponding path program 1 times [2021-11-21 00:54:41,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:41,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47461304] [2021-11-21 00:54:41,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:41,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:41,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:41,120 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 00:54:41,121 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:41,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47461304] [2021-11-21 00:54:41,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47461304] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:41,121 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:41,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:54:41,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388113392] [2021-11-21 00:54:41,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:41,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:54:41,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:41,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:54:41,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:54:41,124 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 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 00:54:41,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:41,169 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-11-21 00:54:41,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:54:41,170 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 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 00:54:41,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:41,171 INFO L225 Difference]: With dead ends: 25 [2021-11-21 00:54:41,171 INFO L226 Difference]: Without dead ends: 25 [2021-11-21 00:54:41,172 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 00:54:41,173 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 27 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 10 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 00:54:41,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 10 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:41,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-21 00:54:41,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18. [2021-11-21 00:54:41,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 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 00:54:41,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-11-21 00:54:41,178 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 5 [2021-11-21 00:54:41,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:41,179 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-11-21 00:54:41,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 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 00:54:41,179 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-11-21 00:54:41,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:54:41,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:41,180 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 00:54:41,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:54:41,180 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:41,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:41,181 INFO L85 PathProgramCache]: Analyzing trace with hash -1154566839, now seen corresponding path program 1 times [2021-11-21 00:54:41,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:41,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938179519] [2021-11-21 00:54:41,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:41,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:41,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:41,295 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 00:54:41,295 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:41,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938179519] [2021-11-21 00:54:41,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [938179519] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:41,296 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:41,296 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:54:41,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706174700] [2021-11-21 00:54:41,297 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:41,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:54:41,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:41,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:54:41,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:54:41,298 INFO L87 Difference]: Start difference. First operand 18 states and 20 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 00:54:41,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:41,356 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2021-11-21 00:54:41,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:54:41,356 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 00:54:41,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:41,360 INFO L225 Difference]: With dead ends: 17 [2021-11-21 00:54:41,360 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 00:54:41,360 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 00:54:41,362 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 13 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:41,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 6 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:41,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 00:54:41,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 00:54:41,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.4615384615384615) 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 00:54:41,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-11-21 00:54:41,367 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 6 [2021-11-21 00:54:41,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:41,367 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-11-21 00:54:41,368 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 00:54:41,368 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-11-21 00:54:41,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:54:41,369 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:41,369 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 00:54:41,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-21 00:54:41,369 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:41,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:41,370 INFO L85 PathProgramCache]: Analyzing trace with hash -1154566838, now seen corresponding path program 1 times [2021-11-21 00:54:41,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:41,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613811679] [2021-11-21 00:54:41,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:41,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:41,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:41,536 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 00:54:41,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:41,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613811679] [2021-11-21 00:54:41,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613811679] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:41,536 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:41,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:54:41,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711338709] [2021-11-21 00:54:41,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:41,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:54:41,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:41,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:54:41,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:54:41,539 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 5 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 00:54:41,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:41,726 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-11-21 00:54:41,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:54:41,726 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 5 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 00:54:41,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:41,728 INFO L225 Difference]: With dead ends: 32 [2021-11-21 00:54:41,732 INFO L226 Difference]: Without dead ends: 32 [2021-11-21 00:54:41,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:54:41,737 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 34 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:41,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 13 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:54:41,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-21 00:54:41,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 20. [2021-11-21 00:54:41,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.375) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 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 00:54:41,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-21 00:54:41,746 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 6 [2021-11-21 00:54:41,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:41,751 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-21 00:54:41,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 5 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 00:54:41,751 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-21 00:54:41,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:54:41,751 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:41,751 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-21 00:54:41,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-21 00:54:41,752 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:41,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:41,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1155972366, now seen corresponding path program 1 times [2021-11-21 00:54:41,752 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:41,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125444010] [2021-11-21 00:54:41,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:41,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:41,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:41,822 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 00:54:41,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:41,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125444010] [2021-11-21 00:54:41,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [125444010] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:54:41,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78299464] [2021-11-21 00:54:41,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:41,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:54:41,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:54:41,825 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:54:41,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:54:41,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:41,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:54:41,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:54:42,013 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:54:42,014 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 00:54:42,147 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 00:54:42,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:54:42,365 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 00:54:42,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78299464] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:54:42,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1743449308] [2021-11-21 00:54:42,395 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 00:54:42,395 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:54:42,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:54:42,409 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:54:42,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:54:42,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:42,648 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 00:54:42,877 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 00:54:43,350 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:54:43,351 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 200 treesize of output 199 [2021-11-21 00:54:44,307 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 00:54:44,655 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 00:54:44,752 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:54:45,468 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:54:45,469 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:54:45,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2021-11-21 00:54:45,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046157821] [2021-11-21 00:54:45,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:54:45,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 00:54:45,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:45,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 00:54:45,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-21 00:54:45,471 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 9 states, 8 states have (on average 1.75) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 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 00:54:45,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:45,632 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2021-11-21 00:54:45,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:54:45,632 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 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 00:54:45,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:45,633 INFO L225 Difference]: With dead ends: 38 [2021-11-21 00:54:45,633 INFO L226 Difference]: Without dead ends: 38 [2021-11-21 00:54:45,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:54:45,635 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 40 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:45,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 19 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:54:45,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-21 00:54:45,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 18. [2021-11-21 00:54:45,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 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 00:54:45,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-11-21 00:54:45,638 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 6 [2021-11-21 00:54:45,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:45,639 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-11-21 00:54:45,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 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 00:54:45,639 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-11-21 00:54:45,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:54:45,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:45,640 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:54:45,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:54:45,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:54:45,853 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:45,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:45,854 INFO L85 PathProgramCache]: Analyzing trace with hash -1437168687, now seen corresponding path program 1 times [2021-11-21 00:54:45,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:45,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264995189] [2021-11-21 00:54:45,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:45,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:45,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:45,935 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 00:54:45,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:45,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264995189] [2021-11-21 00:54:45,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264995189] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:45,935 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:45,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:54:45,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238343035] [2021-11-21 00:54:45,936 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:45,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:54:45,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:45,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:54:45,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:54:45,937 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 00:54:46,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:46,006 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2021-11-21 00:54:46,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:54:46,006 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 00:54:46,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:46,007 INFO L225 Difference]: With dead ends: 23 [2021-11-21 00:54:46,007 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 00:54:46,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:54:46,008 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 13 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:46,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 24 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:46,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 00:54:46,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2021-11-21 00:54:46,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 16 states have (on average 1.3125) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 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 00:54:46,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-11-21 00:54:46,012 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 8 [2021-11-21 00:54:46,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:46,012 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-11-21 00:54:46,012 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 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 00:54:46,012 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-11-21 00:54:46,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:54:46,013 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:46,013 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:54:46,013 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 00:54:46,013 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:46,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:46,014 INFO L85 PathProgramCache]: Analyzing trace with hash 1508528851, now seen corresponding path program 1 times [2021-11-21 00:54:46,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:46,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834015730] [2021-11-21 00:54:46,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:46,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:46,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:46,102 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:54:46,102 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:46,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834015730] [2021-11-21 00:54:46,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834015730] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:54:46,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896669967] [2021-11-21 00:54:46,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:46,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:54:46,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:54:46,109 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:54:46,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:54:46,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:46,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 00:54:46,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:54:46,213 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:54:46,214 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 21 treesize of output 22 [2021-11-21 00:54:46,221 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 20 treesize of output 18 [2021-11-21 00:54:46,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:54:46,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:54:46,532 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 00:54:46,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896669967] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:54:46,533 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:54:46,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 4] total 11 [2021-11-21 00:54:46,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954602184] [2021-11-21 00:54:46,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:46,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:54:46,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:46,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:54:46,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:54:46,535 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 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 00:54:46,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:46,615 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2021-11-21 00:54:46,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:54:46,621 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 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 00:54:46,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:46,624 INFO L225 Difference]: With dead ends: 23 [2021-11-21 00:54:46,625 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 00:54:46,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-11-21 00:54:46,626 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 24 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:46,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 9 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:46,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 00:54:46,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-11-21 00:54:46,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 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 00:54:46,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-21 00:54:46,637 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 8 [2021-11-21 00:54:46,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:46,638 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-21 00:54:46,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 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 00:54:46,638 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-21 00:54:46,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 00:54:46,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:46,639 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:54:46,685 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:54:46,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:54:46,865 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:46,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:46,866 INFO L85 PathProgramCache]: Analyzing trace with hash -1602571835, now seen corresponding path program 1 times [2021-11-21 00:54:46,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:46,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129691393] [2021-11-21 00:54:46,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:46,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:46,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:46,934 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 00:54:46,934 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:46,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129691393] [2021-11-21 00:54:46,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129691393] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:46,935 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:46,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:54:46,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473038664] [2021-11-21 00:54:46,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:46,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:54:46,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:46,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:54:46,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:54:46,936 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 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 00:54:46,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:46,954 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2021-11-21 00:54:46,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:54:46,955 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 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 9 [2021-11-21 00:54:46,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:46,956 INFO L225 Difference]: With dead ends: 19 [2021-11-21 00:54:46,956 INFO L226 Difference]: Without dead ends: 13 [2021-11-21 00:54:46,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 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 00:54:46,957 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 5 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:46,958 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 8 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:46,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-21 00:54:46,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-21 00:54:46,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 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 00:54:46,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-11-21 00:54:46,962 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2021-11-21 00:54:46,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:46,962 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-11-21 00:54:46,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 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 00:54:46,962 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-11-21 00:54:46,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 00:54:46,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:46,963 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:54:46,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-21 00:54:46,964 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:46,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:46,964 INFO L85 PathProgramCache]: Analyzing trace with hash -2002719974, now seen corresponding path program 1 times [2021-11-21 00:54:46,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:46,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464778023] [2021-11-21 00:54:46,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:46,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:46,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:47,103 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 00:54:47,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:47,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464778023] [2021-11-21 00:54:47,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [464778023] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:54:47,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121430380] [2021-11-21 00:54:47,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:47,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:54:47,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:54:47,109 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:54:47,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:54:47,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:47,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 00:54:47,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:54:47,285 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 00:54:47,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:54:47,378 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 00:54:47,403 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 00:54:47,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121430380] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:54:47,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [366736596] [2021-11-21 00:54:47,406 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:54:47,406 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:54:47,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:54:47,407 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:54:47,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:54:47,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:47,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 00:54:47,780 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 00:54:48,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:48,040 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 206 treesize of output 198 [2021-11-21 00:54:48,688 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 00:54:48,947 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 00:54:49,841 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:54:49,842 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 105 treesize of output 101 [2021-11-21 00:54:50,666 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:54:50,720 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:54:50,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:54:51,678 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:54:51,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:54:52,215 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:54:52,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:54:52,419 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:54:53,559 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:54:53,561 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:54:53,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2021-11-21 00:54:53,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16363644] [2021-11-21 00:54:53,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:54:53,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 00:54:53,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:53,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 00:54:53,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-11-21 00:54:53,567 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 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 00:54:53,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:53,711 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-11-21 00:54:53,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:54:53,711 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 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 00:54:53,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:53,712 INFO L225 Difference]: With dead ends: 19 [2021-11-21 00:54:53,712 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 00:54:53,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=109, Invalid=541, Unknown=0, NotChecked=0, Total=650 [2021-11-21 00:54:53,713 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 35 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:53,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 1 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:54:53,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 00:54:53,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2021-11-21 00:54:53,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 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 00:54:53,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-21 00:54:53,715 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-11-21 00:54:53,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:53,716 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-21 00:54:53,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 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 00:54:53,716 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-21 00:54:53,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 00:54:53,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:53,717 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:54:53,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:54:53,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:54:53,929 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:54:53,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:53,930 INFO L85 PathProgramCache]: Analyzing trace with hash -1954777063, now seen corresponding path program 1 times [2021-11-21 00:54:53,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:53,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220685720] [2021-11-21 00:54:53,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:53,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:53,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:54,055 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:54:54,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:54,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220685720] [2021-11-21 00:54:54,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220685720] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:54:54,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [468417586] [2021-11-21 00:54:54,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:54,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:54:54,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:54:54,061 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:54:54,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:54:54,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:54,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:54:54,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:54:54,147 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:54:54,148 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 21 treesize of output 22 [2021-11-21 00:54:54,152 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 20 treesize of output 18 [2021-11-21 00:54:54,435 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:54:54,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:54:54,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:54:54,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [468417586] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:54:54,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [734532509] [2021-11-21 00:54:54,604 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:54:54,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:54:54,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:54:54,605 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:54:54,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:54:54,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:54,689 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 00:54:54,894 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 00:54:55,235 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:54:55,235 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 200 treesize of output 199 [2021-11-21 00:54:55,963 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 00:54:56,180 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 00:54:56,881 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:54:56,881 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 105 treesize of output 101 [2021-11-21 00:54:57,791 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:54:57,849 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:54:57,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:54:58,663 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:54:58,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:54:59,244 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:54:59,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:54:59,531 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:55:00,792 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:55:00,792 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:55:00,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 16 [2021-11-21 00:55:00,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960244095] [2021-11-21 00:55:00,793 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:55:00,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 00:55:00,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:00,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 00:55:00,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2021-11-21 00:55:00,794 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 17 states, 16 states have (on average 1.9375) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 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 00:55:00,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:00,902 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-11-21 00:55:00,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 00:55:00,903 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.9375) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 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 00:55:00,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:00,903 INFO L225 Difference]: With dead ends: 21 [2021-11-21 00:55:00,904 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 00:55:00,904 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:55:00,905 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 2 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:00,906 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 7 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 26 Unchecked, 0.0s Time] [2021-11-21 00:55:00,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 00:55:00,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 16. [2021-11-21 00:55:00,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 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 00:55:00,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-21 00:55:00,908 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-11-21 00:55:00,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:00,908 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-21 00:55:00,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.9375) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 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 00:55:00,909 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-21 00:55:00,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 00:55:00,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:00,909 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:55:00,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:01,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:01,125 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:55:01,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:01,126 INFO L85 PathProgramCache]: Analyzing trace with hash -1640048928, now seen corresponding path program 2 times [2021-11-21 00:55:01,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:01,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457555893] [2021-11-21 00:55:01,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:01,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:01,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:01,329 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:01,330 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:01,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457555893] [2021-11-21 00:55:01,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457555893] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:01,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137295286] [2021-11-21 00:55:01,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:55:01,330 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:01,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:01,331 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:01,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:55:01,389 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:55:01,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:55:01,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-21 00:55:01,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:01,403 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 00:55:01,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 00:55:01,568 INFO L354 Elim1Store]: treesize reduction 34, result has 22.7 percent of original size [2021-11-21 00:55:01,568 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 32 treesize of output 31 [2021-11-21 00:55:01,644 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-21 00:55:01,644 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 24 treesize of output 16 [2021-11-21 00:55:01,673 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:01,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:55:06,737 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 77 treesize of output 71 [2021-11-21 00:55:06,889 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:06,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137295286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:55:06,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2060096322] [2021-11-21 00:55:06,891 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:55:06,891 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:55:06,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:55:06,891 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:55:06,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:55:07,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:07,024 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 00:55:07,220 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 20 treesize of output 16 [2021-11-21 00:55:07,583 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:55:07,584 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 200 treesize of output 199 [2021-11-21 00:55:08,321 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 00:55:08,573 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 00:55:09,224 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:55:09,224 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 105 treesize of output 101 [2021-11-21 00:55:09,959 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:10,007 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:55:10,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:55:10,932 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:10,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:11,523 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:11,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:11,812 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:55:13,004 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:55:13,004 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:55:13,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 24 [2021-11-21 00:55:13,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953468096] [2021-11-21 00:55:13,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:55:13,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 00:55:13,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:13,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 00:55:13,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=879, Unknown=6, NotChecked=0, Total=992 [2021-11-21 00:55:13,006 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 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 00:55:13,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:13,289 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2021-11-21 00:55:13,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:55:13,290 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 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) Word has length 13 [2021-11-21 00:55:13,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:13,291 INFO L225 Difference]: With dead ends: 26 [2021-11-21 00:55:13,291 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 00:55:13,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=168, Invalid=1158, Unknown=6, NotChecked=0, Total=1332 [2021-11-21 00:55:13,293 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:13,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 26 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 116 Invalid, 0 Unknown, 30 Unchecked, 0.1s Time] [2021-11-21 00:55:13,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 00:55:13,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-11-21 00:55:13,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 16 states have (on average 1.1875) internal successors, (19), 17 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 00:55:13,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-11-21 00:55:13,296 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2021-11-21 00:55:13,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:13,296 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-11-21 00:55:13,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 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 00:55:13,297 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-11-21 00:55:13,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:55:13,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:13,297 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 00:55:13,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:13,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 00:55:13,509 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:55:13,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:13,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1222009545, now seen corresponding path program 3 times [2021-11-21 00:55:13,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:13,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125442416] [2021-11-21 00:55:13,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:13,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:13,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:13,628 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:13,629 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:13,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125442416] [2021-11-21 00:55:13,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [125442416] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:13,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347477040] [2021-11-21 00:55:13,630 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:55:13,630 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:13,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:13,631 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:13,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:55:13,688 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:55:13,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:55:13,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-21 00:55:13,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:13,715 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:55:13,715 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 00:55:13,725 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 00:55:13,854 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 15 treesize of output 11 [2021-11-21 00:55:13,933 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 23 treesize of output 22 [2021-11-21 00:55:13,984 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:55:13,984 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 19 treesize of output 19 [2021-11-21 00:55:14,063 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:14,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:55:14,775 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 187 treesize of output 175 [2021-11-21 00:55:15,235 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:15,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347477040] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:55:15,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2108692299] [2021-11-21 00:55:15,237 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:55:15,237 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:55:15,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:55:15,238 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:55:15,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:55:15,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:15,370 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 00:55:15,486 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 20 treesize of output 16 [2021-11-21 00:55:15,753 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:55:15,753 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 200 treesize of output 199 [2021-11-21 00:55:16,358 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 00:55:16,523 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 23 treesize of output 19 [2021-11-21 00:55:17,246 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:55:17,247 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 105 treesize of output 101 [2021-11-21 00:55:17,920 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:17,962 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:55:17,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:55:18,778 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:18,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:19,293 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:19,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:19,509 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:55:20,741 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:55:20,741 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:55:20,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 10] total 24 [2021-11-21 00:55:20,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870350805] [2021-11-21 00:55:20,742 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:55:20,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:55:20,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:20,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:55:20,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=943, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:55:20,743 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 25 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 25 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 00:55:21,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:21,225 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2021-11-21 00:55:21,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:55:21,226 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 25 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) Word has length 15 [2021-11-21 00:55:21,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:21,227 INFO L225 Difference]: With dead ends: 23 [2021-11-21 00:55:21,227 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 00:55:21,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=237, Invalid=1485, Unknown=0, NotChecked=0, Total=1722 [2021-11-21 00:55:21,229 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 90 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:21,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 1 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 158 Invalid, 0 Unknown, 38 Unchecked, 0.2s Time] [2021-11-21 00:55:21,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 00:55:21,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-11-21 00:55:21,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 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 00:55:21,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-21 00:55:21,233 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2021-11-21 00:55:21,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:21,233 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-21 00:55:21,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 25 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 00:55:21,234 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-21 00:55:21,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 00:55:21,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:21,235 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 00:55:21,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:21,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 00:55:21,445 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:55:21,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:21,446 INFO L85 PathProgramCache]: Analyzing trace with hash 772409756, now seen corresponding path program 2 times [2021-11-21 00:55:21,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:21,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502137399] [2021-11-21 00:55:21,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:21,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:21,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:21,543 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:21,543 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:21,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502137399] [2021-11-21 00:55:21,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502137399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:21,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [896447557] [2021-11-21 00:55:21,544 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:55:21,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:21,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:21,545 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:21,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:55:21,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:55:21,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:55:21,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-21 00:55:21,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:21,628 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-21 00:55:21,629 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 21 treesize of output 22 [2021-11-21 00:55:21,631 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 20 treesize of output 18 [2021-11-21 00:55:22,014 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:22,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:55:22,240 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:22,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [896447557] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:55:22,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1566059758] [2021-11-21 00:55:22,243 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:55:22,243 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:55:22,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:55:22,244 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:55:22,244 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:55:22,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:22,316 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 00:55:22,530 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 20 treesize of output 16 [2021-11-21 00:55:22,769 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:55:22,770 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 200 treesize of output 199 [2021-11-21 00:55:23,470 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 00:55:23,632 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 00:55:24,276 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:55:24,277 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 105 treesize of output 101 [2021-11-21 00:55:24,919 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:24,967 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:55:24,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:55:25,699 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:25,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:26,162 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:26,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:26,528 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:55:27,810 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:55:27,810 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:55:27,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 21 [2021-11-21 00:55:27,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091242433] [2021-11-21 00:55:27,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:55:27,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 00:55:27,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:27,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 00:55:27,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=769, Unknown=0, NotChecked=0, Total=870 [2021-11-21 00:55:27,812 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 22 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 22 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 00:55:28,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:28,113 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-11-21 00:55:28,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:55:28,115 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 22 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-21 00:55:28,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:28,116 INFO L225 Difference]: With dead ends: 21 [2021-11-21 00:55:28,116 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 00:55:28,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=166, Invalid=1240, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 00:55:28,117 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 3 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:28,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 3 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 33 Unchecked, 0.0s Time] [2021-11-21 00:55:28,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 00:55:28,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-21 00:55:28,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 20 states have internal predecessors, (22), 0 states have call successors, (0), 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 00:55:28,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-11-21 00:55:28,120 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2021-11-21 00:55:28,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:28,120 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-11-21 00:55:28,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 22 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 00:55:28,120 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-11-21 00:55:28,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 00:55:28,121 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:28,121 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-21 00:55:28,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:28,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 00:55:28,337 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:55:28,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:28,338 INFO L85 PathProgramCache]: Analyzing trace with hash -743566429, now seen corresponding path program 4 times [2021-11-21 00:55:28,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:28,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932754214] [2021-11-21 00:55:28,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:28,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:28,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:28,584 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:28,584 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:28,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932754214] [2021-11-21 00:55:28,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932754214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:28,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216789410] [2021-11-21 00:55:28,585 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:55:28,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:28,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:28,589 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:28,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:55:28,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:28,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-21 00:55:28,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:28,679 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 00:55:28,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 00:55:28,889 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 28 treesize of output 27 [2021-11-21 00:55:28,954 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-21 00:55:28,954 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 00:55:28,982 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 7 [2021-11-21 00:55:28,990 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:28,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:55:33,714 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 2)) 0)) is different from false [2021-11-21 00:55:37,428 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 378 treesize of output 366 [2021-11-21 00:55:37,811 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2021-11-21 00:55:37,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216789410] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:55:37,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1144971343] [2021-11-21 00:55:37,813 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:55:37,814 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:55:37,814 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:55:37,814 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:55:37,814 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:55:37,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:37,946 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 00:55:38,065 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 00:55:38,329 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:55:38,329 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 200 treesize of output 199 [2021-11-21 00:55:38,953 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 00:55:39,287 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 00:55:39,974 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:55:39,974 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 105 treesize of output 101 [2021-11-21 00:55:40,720 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:40,754 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:55:40,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:55:41,577 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:41,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:42,045 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:42,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:42,236 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:55:43,485 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:55:43,485 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:55:43,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 13] total 23 [2021-11-21 00:55:43,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765257826] [2021-11-21 00:55:43,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:55:43,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 00:55:43,486 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:43,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 00:55:43,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=776, Unknown=9, NotChecked=56, Total=930 [2021-11-21 00:55:43,486 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 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 00:55:43,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:43,738 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-11-21 00:55:43,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:55:43,739 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 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) Word has length 18 [2021-11-21 00:55:43,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:43,739 INFO L225 Difference]: With dead ends: 34 [2021-11-21 00:55:43,740 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 00:55:43,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=158, Invalid=1169, Unknown=9, NotChecked=70, Total=1406 [2021-11-21 00:55:43,741 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 34 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:43,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 41 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 187 Invalid, 0 Unknown, 34 Unchecked, 0.1s Time] [2021-11-21 00:55:43,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 00:55:43,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-11-21 00:55:43,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 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 00:55:43,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-21 00:55:43,744 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2021-11-21 00:55:43,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:43,744 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-21 00:55:43,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6956521739130435) internal successors, (39), 23 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 00:55:43,745 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-21 00:55:43,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:55:43,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:43,746 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-21 00:55:43,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:43,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 00:55:43,961 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:55:43,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:43,962 INFO L85 PathProgramCache]: Analyzing trace with hash 822389676, now seen corresponding path program 5 times [2021-11-21 00:55:43,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:43,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912245040] [2021-11-21 00:55:43,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:43,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:43,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:44,083 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:44,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:44,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912245040] [2021-11-21 00:55:44,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912245040] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:44,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2127871134] [2021-11-21 00:55:44,084 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:55:44,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:44,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:44,086 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:44,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:55:44,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:55:44,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:55:44,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 00:55:44,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:44,342 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:44,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:55:44,514 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 00:55:44,544 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:44,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2127871134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:55:44,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [780509637] [2021-11-21 00:55:44,546 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:55:44,546 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:55:44,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:55:44,547 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:55:44,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:55:44,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:44,709 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 00:55:44,859 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 00:55:45,243 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:55:45,243 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 200 treesize of output 199 [2021-11-21 00:55:45,833 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 00:55:46,097 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 00:55:46,775 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:55:46,775 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 105 treesize of output 101 [2021-11-21 00:55:47,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:47,518 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:55:47,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:55:48,265 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:48,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:48,830 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:48,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:49,055 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:55:50,209 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:55:50,209 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:55:50,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 23 [2021-11-21 00:55:50,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633543070] [2021-11-21 00:55:50,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:55:50,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 00:55:50,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:50,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 00:55:50,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=862, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:55:50,211 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 24 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 24 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 00:55:50,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:50,421 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-11-21 00:55:50,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:55:50,421 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 24 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 20 [2021-11-21 00:55:50,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:50,422 INFO L225 Difference]: With dead ends: 28 [2021-11-21 00:55:50,422 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 00:55:50,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=223, Invalid=1183, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 00:55:50,423 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 53 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:50,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 1 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:55:50,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 00:55:50,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2021-11-21 00:55:50,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 24 states have internal predecessors, (26), 0 states have call successors, (0), 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 00:55:50,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-11-21 00:55:50,427 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2021-11-21 00:55:50,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:50,427 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-11-21 00:55:50,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 24 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 00:55:50,427 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-11-21 00:55:50,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-21 00:55:50,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:50,428 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-21 00:55:50,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:50,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:50,633 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:55:50,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:50,634 INFO L85 PathProgramCache]: Analyzing trace with hash -275723833, now seen corresponding path program 3 times [2021-11-21 00:55:50,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:50,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426649342] [2021-11-21 00:55:50,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:50,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:50,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:50,775 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:50,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:50,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426649342] [2021-11-21 00:55:50,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426649342] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:50,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475113359] [2021-11-21 00:55:50,776 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:55:50,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:50,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:50,777 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:50,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:55:50,837 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:55:50,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:55:50,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-21 00:55:50,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:50,862 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:55:50,862 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 13 treesize of output 18 [2021-11-21 00:55:50,873 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 00:55:51,211 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:55:51,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:55:51,634 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-21 00:55:51,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475113359] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:55:51,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1308059227] [2021-11-21 00:55:51,638 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:55:51,638 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:55:51,639 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:55:51,639 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:55:51,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:55:51,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:51,701 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 00:55:51,928 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 00:55:52,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:52,151 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 206 treesize of output 198 [2021-11-21 00:55:52,635 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 00:55:52,885 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 00:55:53,588 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:55:53,588 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 105 treesize of output 101 [2021-11-21 00:55:54,213 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:54,256 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:55:54,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:55:55,017 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:55,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:55,612 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:55:55,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:55:55,874 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:55:57,134 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:55:57,134 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:55:57,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 25 [2021-11-21 00:55:57,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654895426] [2021-11-21 00:55:57,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:55:57,135 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 00:55:57,135 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:57,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 00:55:57,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=998, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:55:57,137 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 26 states, 25 states have (on average 2.12) internal successors, (53), 26 states have internal predecessors, (53), 0 states have call successors, (0), 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 00:55:57,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:57,957 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2021-11-21 00:55:57,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 00:55:57,958 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.12) internal successors, (53), 26 states have internal predecessors, (53), 0 states have call successors, (0), 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 21 [2021-11-21 00:55:57,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:57,958 INFO L225 Difference]: With dead ends: 38 [2021-11-21 00:55:57,958 INFO L226 Difference]: Without dead ends: 38 [2021-11-21 00:55:57,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=349, Invalid=2003, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 00:55:57,959 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 60 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:57,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 2 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 234 Invalid, 0 Unknown, 33 Unchecked, 0.2s Time] [2021-11-21 00:55:57,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-21 00:55:57,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2021-11-21 00:55:57,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 34 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 00:55:57,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-11-21 00:55:57,963 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 21 [2021-11-21 00:55:57,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:57,963 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-11-21 00:55:57,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.12) internal successors, (53), 26 states have internal predecessors, (53), 0 states have call successors, (0), 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 00:55:57,964 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-11-21 00:55:57,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-21 00:55:57,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:57,965 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-21 00:55:57,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:58,189 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:58,189 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:55:58,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:58,190 INFO L85 PathProgramCache]: Analyzing trace with hash 1317369102, now seen corresponding path program 6 times [2021-11-21 00:55:58,190 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:58,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328968900] [2021-11-21 00:55:58,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:58,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:58,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:58,428 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 4 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:58,429 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:58,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328968900] [2021-11-21 00:55:58,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328968900] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:58,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439543640] [2021-11-21 00:55:58,429 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:55:58,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:58,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:58,430 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:58,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:55:58,481 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:55:58,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:55:58,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-21 00:55:58,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:58,497 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 00:55:58,503 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 00:55:58,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 00:55:58,762 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 23 treesize of output 22 [2021-11-21 00:55:58,842 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 23 treesize of output 22 [2021-11-21 00:55:58,935 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:55:58,936 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 27 treesize of output 26 [2021-11-21 00:55:59,004 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-21 00:55:59,004 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 34 treesize of output 25 [2021-11-21 00:55:59,017 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 11 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:55:59,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:56:14,574 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 10232 treesize of output 10104 [2021-11-21 00:56:14,933 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-21 00:56:14,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1055677771] [2021-11-21 00:56:14,935 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:56:14,935 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:56:14,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:56:14,936 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:56:14,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:56:15,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:15,036 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 00:56:15,185 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 00:56:15,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:15,387 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 206 treesize of output 198 [2021-11-21 00:56:15,958 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 00:56:16,108 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 00:56:16,912 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:56:16,912 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 105 treesize of output 101 [2021-11-21 00:56:17,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:17,516 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:56:17,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:56:18,335 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:56:18,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:56:18,970 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:56:18,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:56:19,168 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:56:20,535 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:56:20,535 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:56:20,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-21 00:56:20,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25017685] [2021-11-21 00:56:20,535 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:56:20,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:56:20,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:20,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:56:20,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1413, Unknown=10, NotChecked=0, Total=1560 [2021-11-21 00:56:20,536 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 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 00:56:20,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:20,875 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-11-21 00:56:20,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:56:20,876 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 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 23 [2021-11-21 00:56:20,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:20,878 INFO L225 Difference]: With dead ends: 51 [2021-11-21 00:56:20,878 INFO L226 Difference]: Without dead ends: 38 [2021-11-21 00:56:20,879 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=180, Invalid=1972, Unknown=10, NotChecked=0, Total=2162 [2021-11-21 00:56:20,880 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:20,880 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 27 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:56:20,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-21 00:56:20,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-11-21 00:56:20,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 36 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 00:56:20,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-21 00:56:20,885 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 23 [2021-11-21 00:56:20,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:20,885 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-21 00:56:20,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 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 00:56:20,886 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-21 00:56:20,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 00:56:20,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:20,887 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-21 00:56:20,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:56:21,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:21,113 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:56:21,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:21,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1189706405, now seen corresponding path program 7 times [2021-11-21 00:56:21,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:21,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107706421] [2021-11-21 00:56:21,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:21,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:21,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:21,315 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:56:21,316 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:21,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107706421] [2021-11-21 00:56:21,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107706421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:21,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295034142] [2021-11-21 00:56:21,316 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:56:21,316 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:21,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:21,321 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:56:21,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:56:21,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:21,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-21 00:56:21,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:56:21,615 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 9 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:56:21,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:56:21,799 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 00:56:21,834 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 9 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:56:21,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295034142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:56:21,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [842921166] [2021-11-21 00:56:21,835 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:56:21,835 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:56:21,835 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:56:21,836 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:56:21,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:56:21,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:21,887 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 00:56:22,091 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 00:56:22,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:22,283 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 206 treesize of output 198 [2021-11-21 00:56:22,925 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 00:56:23,101 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 00:56:23,788 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:56:23,789 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 105 treesize of output 101 [2021-11-21 00:56:24,537 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:24,572 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:56:24,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:56:25,116 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:56:25,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:56:25,683 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:56:25,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:56:25,887 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:56:27,119 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:56:27,119 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:56:27,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 24 [2021-11-21 00:56:27,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187533464] [2021-11-21 00:56:27,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:56:27,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:56:27,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:27,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:56:27,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=931, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:56:27,121 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 25 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 25 states have internal predecessors, (53), 0 states have call successors, (0), 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 00:56:27,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:27,551 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2021-11-21 00:56:27,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:56:27,555 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 25 states have internal predecessors, (53), 0 states have call successors, (0), 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 25 [2021-11-21 00:56:27,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:27,556 INFO L225 Difference]: With dead ends: 37 [2021-11-21 00:56:27,556 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 00:56:27,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=237, Invalid=1323, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 00:56:27,557 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 112 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:27,558 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 1 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:56:27,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 00:56:27,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-21 00:56:27,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 36 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:56:27,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2021-11-21 00:56:27,561 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 25 [2021-11-21 00:56:27,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:27,561 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2021-11-21 00:56:27,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 25 states have internal predecessors, (53), 0 states have call successors, (0), 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 00:56:27,561 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2021-11-21 00:56:27,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 00:56:27,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:27,562 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-21 00:56:27,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:56:27,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-21 00:56:27,763 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:56:27,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:27,763 INFO L85 PathProgramCache]: Analyzing trace with hash 473372533, now seen corresponding path program 8 times [2021-11-21 00:56:27,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:27,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441113890] [2021-11-21 00:56:27,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:27,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:27,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:28,137 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:56:28,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:28,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441113890] [2021-11-21 00:56:28,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441113890] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:28,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349499248] [2021-11-21 00:56:28,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:56:28,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:28,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:28,138 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:56:28,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:56:28,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 00:56:28,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:56:28,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-21 00:56:28,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:56:28,262 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 00:56:28,446 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 00:56:28,518 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 28 treesize of output 27 [2021-11-21 00:56:28,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-21 00:56:28,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-21 00:56:28,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-21 00:56:28,612 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 7 [2021-11-21 00:56:28,618 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:56:28,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:56:29,329 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= 0 (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 1)))) is different from false [2021-11-21 00:56:30,011 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 2)) 0)) is different from false [2021-11-21 00:56:43,064 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcpy_#t~mem4#1_115| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_112| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_81| Int) (|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_83| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_83| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_115|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_81| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_112|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 3)) 0)) is different from false [2021-11-21 00:56:43,737 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcpy_#t~mem4#1_115| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_112| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_81| Int) (|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_83| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_83| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_115|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_81| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_112|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 4)) 0)) is different from false [2021-11-21 00:56:52,206 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 6322 treesize of output 6274 [2021-11-21 00:56:52,784 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-21 00:56:52,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1251499816] [2021-11-21 00:56:52,786 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:56:52,786 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:56:52,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:56:52,786 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:56:52,786 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:56:52,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:52,886 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 00:56:53,012 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 00:56:53,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:53,282 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 206 treesize of output 198 [2021-11-21 00:56:53,765 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 23 treesize of output 19 [2021-11-21 00:56:53,954 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 00:56:54,596 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:56:54,597 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 105 treesize of output 101 [2021-11-21 00:56:55,308 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:55,361 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:56:55,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:56:56,089 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:56:56,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:56:56,633 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:56:56,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:56:56,912 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:56:58,262 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:56:58,262 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:56:58,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-11-21 00:56:58,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554614102] [2021-11-21 00:56:58,262 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:56:58,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 00:56:58,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:58,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 00:56:58,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1084, Unknown=26, NotChecked=276, Total=1482 [2021-11-21 00:56:58,264 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 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 00:56:58,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:58,623 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2021-11-21 00:56:58,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 00:56:58,623 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 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 00:56:58,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:58,624 INFO L225 Difference]: With dead ends: 56 [2021-11-21 00:56:58,624 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 00:56:58,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 25.4s TimeCoverageRelationStatistics Valid=165, Invalid=1631, Unknown=26, NotChecked=340, Total=2162 [2021-11-21 00:56:58,625 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:58,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 28 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:56:58,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 00:56:58,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-11-21 00:56:58,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 37 states have (on average 1.135135135135135) internal successors, (42), 38 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 00:56:58,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-11-21 00:56:58,628 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 28 [2021-11-21 00:56:58,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:58,629 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-11-21 00:56:58,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 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 00:56:58,629 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-11-21 00:56:58,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-21 00:56:58,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:58,630 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1] [2021-11-21 00:56:58,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:56:58,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-21 00:56:58,853 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:56:58,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:58,854 INFO L85 PathProgramCache]: Analyzing trace with hash 1278867518, now seen corresponding path program 9 times [2021-11-21 00:56:58,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:58,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044581978] [2021-11-21 00:56:58,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:58,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:58,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:59,098 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 9 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:56:59,098 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:59,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044581978] [2021-11-21 00:56:59,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044581978] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:59,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110556945] [2021-11-21 00:56:59,099 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:56:59,099 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:59,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:59,100 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:56:59,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:56:59,169 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:56:59,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:56:59,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-21 00:56:59,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:56:59,194 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 00:56:59,194 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 00:56:59,203 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 00:56:59,444 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 15 treesize of output 11 [2021-11-21 00:56:59,532 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 23 treesize of output 22 [2021-11-21 00:56:59,606 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 23 treesize of output 22 [2021-11-21 00:56:59,696 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 23 treesize of output 22 [2021-11-21 00:56:59,782 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-21 00:56:59,782 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 27 treesize of output 26 [2021-11-21 00:56:59,867 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:56:59,867 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 19 treesize of output 19 [2021-11-21 00:56:59,969 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 20 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:56:59,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:57:08,037 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 6395 treesize of output 6347 [2021-11-21 00:57:08,340 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-21 00:57:08,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1551898705] [2021-11-21 00:57:08,342 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:57:08,343 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:57:08,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:57:08,343 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:57:08,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:57:08,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:57:08,432 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 00:57:08,712 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 00:57:08,962 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:57:08,962 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 200 treesize of output 199 [2021-11-21 00:57:09,600 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 00:57:09,844 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 00:57:10,464 INFO L354 Elim1Store]: treesize reduction 28, result has 33.3 percent of original size [2021-11-21 00:57:10,465 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 105 treesize of output 101 [2021-11-21 00:57:11,199 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:57:11,238 INFO L354 Elim1Store]: treesize reduction 118, result has 19.2 percent of original size [2021-11-21 00:57:11,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 119 treesize of output 117 [2021-11-21 00:57:11,919 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:57:11,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:57:12,421 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:57:12,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:57:12,732 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:57:14,336 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:57:14,336 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:57:14,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-21 00:57:14,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332761749] [2021-11-21 00:57:14,337 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 00:57:14,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 00:57:14,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:14,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 00:57:14,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=2132, Unknown=7, NotChecked=0, Total=2352 [2021-11-21 00:57:14,339 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 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 00:57:14,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:14,739 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2021-11-21 00:57:14,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 00:57:14,739 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 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 00:57:14,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:14,740 INFO L225 Difference]: With dead ends: 39 [2021-11-21 00:57:14,740 INFO L226 Difference]: Without dead ends: 39 [2021-11-21 00:57:14,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=311, Invalid=2762, Unknown=7, NotChecked=0, Total=3080 [2021-11-21 00:57:14,742 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 40 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:14,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 1 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:57:14,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-21 00:57:14,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-21 00:57:14,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 38 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 00:57:14,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2021-11-21 00:57:14,746 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 30 [2021-11-21 00:57:14,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:14,746 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2021-11-21 00:57:14,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 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 00:57:14,747 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2021-11-21 00:57:14,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-21 00:57:14,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:14,748 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-21 00:57:14,779 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-21 00:57:14,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:14,957 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 5 more)] === [2021-11-21 00:57:14,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:14,958 INFO L85 PathProgramCache]: Analyzing trace with hash -1912666308, now seen corresponding path program 10 times [2021-11-21 00:57:14,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:14,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736164882] [2021-11-21 00:57:14,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:14,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:14,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:15,393 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 6 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:57:15,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:15,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736164882] [2021-11-21 00:57:15,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736164882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:15,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465854597] [2021-11-21 00:57:15,393 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:57:15,393 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:15,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:15,394 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:15,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aab85c93-f3ab-4879-8118-2bdc099f256b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 00:57:15,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:15,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-21 00:57:15,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:15,492 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 00:57:15,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-21 00:57:15,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:57:15,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:57:15,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:57:16,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:57:16,086 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-21 00:57:16,086 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 23 treesize of output 22 [2021-11-21 00:57:16,165 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 7 [2021-11-21 00:57:16,172 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 6 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:57:16,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:57:25,997 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 2)) 0)) is different from false [2021-11-21 00:57:37,778 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcpy_#t~mem4#1_146| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_103| Int) (|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_103| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_146|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 3)) 0)) is different from false [2021-11-21 00:57:46,656 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcpy_~to#1.offset_105| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_146| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_103| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_149| Int) (|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_105| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_149|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_103| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_146|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 4)) 0)) is different from false [2021-11-21 00:57:47,483 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcpy_~to#1.offset_105| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_146| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_103| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_149| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_107| Int) (|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_152| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_107| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_152|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_105| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_149|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_103| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_146|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 4)) 0)) is different from false [2021-11-21 00:57:48,301 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcpy_~to#1.offset_105| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_146| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_103| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_149| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_107| Int) (|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_152| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_107| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_152|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_105| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_149|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_103| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_146|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 5)) 0)) is different from false [2021-11-21 00:57:49,202 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrcpy_~to#1.offset_105| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_146| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_103| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_149| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_109| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_155| Int) (|v_ULTIMATE.start_cstrcpy_~to#1.offset_107| Int) (|ULTIMATE.start_cstrcpy_#t~mem4#1| Int) (|v_ULTIMATE.start_cstrcpy_#t~mem4#1_152| Int) (|ULTIMATE.start_cstrcpy_~to#1.offset| Int)) (= 0 (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base| (store (store (store (store (store (select |c_#memory_int| |c_ULTIMATE.start_cstrcpy_~to#1.base|) |ULTIMATE.start_cstrcpy_~to#1.offset| |ULTIMATE.start_cstrcpy_#t~mem4#1|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_109| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_155|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_107| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_152|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_105| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_149|) |v_ULTIMATE.start_cstrcpy_~to#1.offset_103| |v_ULTIMATE.start_cstrcpy_#t~mem4#1_146|)) |c_ULTIMATE.start_cstrcpy_~from#1.base|) (+ |c_ULTIMATE.start_cstrcpy_~from#1.offset| 5)))) is different from false [2021-11-21 00:57:49,340 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 1612709872 treesize of output 1606418416