./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1b9a71645175fee79e6d6cd797db38ce6044ffb9 .......................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1b9a71645175fee79e6d6cd797db38ce6044ffb9 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 07:13:58,384 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 07:13:58,385 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 07:13:58,438 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 07:13:58,438 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 07:13:58,443 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 07:13:58,446 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 07:13:58,450 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 07:13:58,453 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 07:13:58,461 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 07:13:58,462 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 07:13:58,464 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 07:13:58,464 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 07:13:58,468 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 07:13:58,470 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 07:13:58,478 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 07:13:58,479 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 07:13:58,480 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 07:13:58,482 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 07:13:58,485 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 07:13:58,487 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 07:13:58,491 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 07:13:58,495 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 07:13:58,496 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 07:13:58,508 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 07:13:58,509 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 07:13:58,509 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 07:13:58,511 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 07:13:58,512 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 07:13:58,514 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 07:13:58,515 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 07:13:58,516 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 07:13:58,518 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 07:13:58,519 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 07:13:58,521 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 07:13:58,521 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 07:13:58,522 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 07:13:58,522 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 07:13:58,523 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 07:13:58,524 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 07:13:58,524 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 07:13:58,525 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-13 07:13:58,576 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 07:13:58,580 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 07:13:58,582 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 07:13:58,582 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 07:13:58,582 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 07:13:58,582 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 07:13:58,583 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-13 07:13:58,583 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 07:13:58,590 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 07:13:58,590 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-13 07:13:58,591 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-13 07:13:58,592 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 07:13:58,592 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-13 07:13:58,592 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-13 07:13:58,592 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-13 07:13:58,593 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 07:13:58,593 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 07:13:58,594 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 07:13:58,594 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 07:13:58,594 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 07:13:58,594 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 07:13:58,594 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 07:13:58,595 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 07:13:58,595 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 07:13:58,595 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 07:13:58,595 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 07:13:58,596 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 07:13:58,596 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 07:13:58,596 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 07:13:58,596 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 07:13:58,597 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:13:58,597 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 07:13:58,597 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 07:13:58,598 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 07:13:58,598 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-13 07:13:58,598 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 07:13:58,598 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 07:13:58,599 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 07:13:58,599 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 07:13:58,599 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_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1b9a71645175fee79e6d6cd797db38ce6044ffb9 [2021-10-13 07:13:58,885 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 07:13:58,913 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 07:13:58,916 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 07:13:58,917 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 07:13:58,918 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 07:13:58,919 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/loops/invert_string-1.c [2021-10-13 07:13:58,986 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data/9bde69d6f/fe087a78915840748374e9178bf02124/FLAGc0b4a4a78 [2021-10-13 07:13:59,482 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 07:13:59,483 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/sv-benchmarks/c/loops/invert_string-1.c [2021-10-13 07:13:59,494 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data/9bde69d6f/fe087a78915840748374e9178bf02124/FLAGc0b4a4a78 [2021-10-13 07:13:59,834 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data/9bde69d6f/fe087a78915840748374e9178bf02124 [2021-10-13 07:13:59,837 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 07:13:59,839 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 07:13:59,854 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 07:13:59,854 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 07:13:59,857 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 07:13:59,858 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:13:59" (1/1) ... [2021-10-13 07:13:59,859 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13e687e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:59, skipping insertion in model container [2021-10-13 07:13:59,859 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:13:59" (1/1) ... [2021-10-13 07:13:59,883 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 07:13:59,897 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 07:14:00,113 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2021-10-13 07:14:00,147 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:14:00,169 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 07:14:00,187 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2021-10-13 07:14:00,217 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:14:00,235 INFO L208 MainTranslator]: Completed translation [2021-10-13 07:14:00,235 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00 WrapperNode [2021-10-13 07:14:00,236 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 07:14:00,237 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 07:14:00,237 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 07:14:00,237 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 07:14:00,246 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,256 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,280 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 07:14:00,281 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 07:14:00,281 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 07:14:00,281 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 07:14:00,291 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,294 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,294 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,300 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,305 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,306 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,309 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 07:14:00,310 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 07:14:00,310 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 07:14:00,310 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 07:14:00,311 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (1/1) ... [2021-10-13 07:14:00,319 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:14:00,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:14:00,348 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 07:14:00,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 07:14:00,401 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-13 07:14:00,401 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 07:14:00,401 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-13 07:14:00,401 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 07:14:00,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 07:14:00,402 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-13 07:14:00,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 07:14:00,805 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 07:14:00,806 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-10-13 07:14:00,808 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:14:00 BoogieIcfgContainer [2021-10-13 07:14:00,821 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 07:14:00,823 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 07:14:00,824 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 07:14:00,827 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 07:14:00,827 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 07:13:59" (1/3) ... [2021-10-13 07:14:00,828 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23fcc7c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:14:00, skipping insertion in model container [2021-10-13 07:14:00,829 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:00" (2/3) ... [2021-10-13 07:14:00,829 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23fcc7c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:14:00, skipping insertion in model container [2021-10-13 07:14:00,829 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:14:00" (3/3) ... [2021-10-13 07:14:00,831 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2021-10-13 07:14:00,836 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 07:14:00,840 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 07:14:00,915 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 07:14:00,922 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-10-13 07:14:00,922 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 07:14:00,937 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:00,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 07:14:00,942 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:00,942 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 07:14:00,943 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:14:00,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:00,949 INFO L82 PathProgramCache]: Analyzing trace with hash -1214562904, now seen corresponding path program 1 times [2021-10-13 07:14:00,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:14:00,959 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470152860] [2021-10-13 07:14:00,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:00,960 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:14:01,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:01,165 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:01,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:14:01,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470152860] [2021-10-13 07:14:01,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470152860] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:14:01,168 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:14:01,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 07:14:01,170 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994839833] [2021-10-13 07:14:01,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:14:01,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:14:01,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:14:01,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:14:01,193 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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) [2021-10-13 07:14:01,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:14:01,228 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2021-10-13 07:14:01,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:14:01,230 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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 [2021-10-13 07:14:01,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:14:01,239 INFO L225 Difference]: With dead ends: 17 [2021-10-13 07:14:01,239 INFO L226 Difference]: Without dead ends: 9 [2021-10-13 07:14:01,242 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:14:01,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-10-13 07:14:01,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-10-13 07:14:01,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:01,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2021-10-13 07:14:01,275 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2021-10-13 07:14:01,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:14:01,275 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2021-10-13 07:14:01,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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) [2021-10-13 07:14:01,276 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2021-10-13 07:14:01,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-13 07:14:01,276 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:01,276 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:14:01,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 07:14:01,277 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:14:01,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:01,278 INFO L82 PathProgramCache]: Analyzing trace with hash 748360949, now seen corresponding path program 1 times [2021-10-13 07:14:01,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:14:01,278 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030532672] [2021-10-13 07:14:01,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:01,300 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:14:01,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:01,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:14:01,429 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:14:01,429 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030532672] [2021-10-13 07:14:01,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030532672] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:14:01,430 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:14:01,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 07:14:01,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534586712] [2021-10-13 07:14:01,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:14:01,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:14:01,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:14:01,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:14:01,434 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:01,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:14:01,470 INFO L93 Difference]: Finished difference Result 15 states and 18 transitions. [2021-10-13 07:14:01,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:14:01,471 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-10-13 07:14:01,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:14:01,472 INFO L225 Difference]: With dead ends: 15 [2021-10-13 07:14:01,472 INFO L226 Difference]: Without dead ends: 10 [2021-10-13 07:14:01,473 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 07:14:01,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-10-13 07:14:01,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-10-13 07:14:01,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:01,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-10-13 07:14:01,478 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2021-10-13 07:14:01,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:14:01,478 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-10-13 07:14:01,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:01,479 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-10-13 07:14:01,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-13 07:14:01,479 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:01,480 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:14:01,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 07:14:01,480 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:14:01,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:01,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1720655960, now seen corresponding path program 1 times [2021-10-13 07:14:01,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:14:01,482 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772445388] [2021-10-13 07:14:01,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:01,482 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:14:01,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:02,034 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:02,035 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:14:02,041 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772445388] [2021-10-13 07:14:02,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772445388] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 07:14:02,043 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386463238] [2021-10-13 07:14:02,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:02,044 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:14:02,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:14:02,046 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:14:02,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 07:14:02,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:02,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 25 conjunts are in the unsatisfiable core [2021-10-13 07:14:02,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:02,229 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 47 treesize of output 45 [2021-10-13 07:14:02,421 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 15 treesize of output 15 [2021-10-13 07:14:02,621 INFO L354 Elim1Store]: treesize reduction 26, result has 10.3 percent of original size [2021-10-13 07:14:02,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 36 [2021-10-13 07:14:02,667 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:02,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:02,781 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:02,781 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 23 treesize of output 26 [2021-10-13 07:14:02,807 INFO L354 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2021-10-13 07:14:02,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 29 [2021-10-13 07:14:02,831 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 29 treesize of output 24 [2021-10-13 07:14:03,023 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:03,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386463238] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:03,024 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1254149407] [2021-10-13 07:14:03,058 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-10-13 07:14:03,058 INFO L166 IcfgInterpreter]: Building call graph [2021-10-13 07:14:03,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-13 07:14:03,074 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-13 07:14:03,074 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-13 07:14:03,113 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:03,119 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 07:14:03,120 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:03,121 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 92 [2021-10-13 07:14:03,122 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 07:14:03,123 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:03,123 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-10-13 07:14:03,165 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 238 [2021-10-13 07:14:03,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:03,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 18 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 26 [2021-10-13 07:14:03,266 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:03,267 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-10-13 07:14:03,268 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:03,269 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-10-13 07:14:03,269 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-13 07:14:03,295 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-10-13 07:14:03,296 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:03,296 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-13 07:14:03,297 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:03,298 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-10-13 07:14:03,298 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-13 07:14:03,301 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-13 07:14:03,377 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:03,387 INFO L180 QuantifierPusher]: treesize reduction 2, result has 99.1 percent of original size [2021-10-13 07:14:03,398 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 215 [2021-10-13 07:14:03,402 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-13 07:14:03,403 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:427, output treesize:215 [2021-10-13 07:14:03,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:03,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:14:03,605 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#valid_39| at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.constructTermVarsProc(BasicPredicateFactory.java:92) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.newPredicate(BasicPredicateFactory.java:81) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.predicate(SymbolicTools.java:174) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-13 07:14:03,608 INFO L168 Benchmark]: Toolchain (without parser) took 3769.14 ms. Allocated memory was 96.5 MB in the beginning and 117.4 MB in the end (delta: 21.0 MB). Free memory was 55.2 MB in the beginning and 53.2 MB in the end (delta: 2.0 MB). Peak memory consumption was 20.3 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:03,609 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 96.5 MB. Free memory is still 71.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:14:03,609 INFO L168 Benchmark]: CACSL2BoogieTranslator took 382.22 ms. Allocated memory is still 96.5 MB. Free memory was 55.0 MB in the beginning and 71.9 MB in the end (delta: -16.8 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:03,610 INFO L168 Benchmark]: Boogie Procedure Inliner took 43.13 ms. Allocated memory is still 96.5 MB. Free memory was 71.9 MB in the beginning and 70.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:03,610 INFO L168 Benchmark]: Boogie Preprocessor took 28.43 ms. Allocated memory is still 96.5 MB. Free memory was 70.3 MB in the beginning and 69.1 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:03,611 INFO L168 Benchmark]: RCFGBuilder took 511.68 ms. Allocated memory is still 96.5 MB. Free memory was 69.1 MB in the beginning and 54.1 MB in the end (delta: 14.9 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:03,611 INFO L168 Benchmark]: TraceAbstraction took 2784.05 ms. Allocated memory was 96.5 MB in the beginning and 117.4 MB in the end (delta: 21.0 MB). Free memory was 53.6 MB in the beginning and 53.2 MB in the end (delta: 466.5 kB). Peak memory consumption was 20.4 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:03,613 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 96.5 MB. Free memory is still 71.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 382.22 ms. Allocated memory is still 96.5 MB. Free memory was 55.0 MB in the beginning and 71.9 MB in the end (delta: -16.8 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 43.13 ms. Allocated memory is still 96.5 MB. Free memory was 71.9 MB in the beginning and 70.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.43 ms. Allocated memory is still 96.5 MB. Free memory was 70.3 MB in the beginning and 69.1 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 511.68 ms. Allocated memory is still 96.5 MB. Free memory was 69.1 MB in the beginning and 54.1 MB in the end (delta: 14.9 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2784.05 ms. Allocated memory was 96.5 MB in the beginning and 117.4 MB in the end (delta: 21.0 MB). Free memory was 53.6 MB in the beginning and 53.2 MB in the end (delta: 466.5 kB). Peak memory consumption was 20.4 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#valid_39| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#valid_39|: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-13 07:14:03,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 07:14:06,346 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 07:14:06,348 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 07:14:06,403 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 07:14:06,404 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 07:14:06,409 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 07:14:06,411 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 07:14:06,417 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 07:14:06,421 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 07:14:06,430 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 07:14:06,432 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 07:14:06,435 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 07:14:06,435 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 07:14:06,439 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 07:14:06,442 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 07:14:06,448 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 07:14:06,450 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 07:14:06,451 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 07:14:06,454 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 07:14:06,464 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 07:14:06,466 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 07:14:06,468 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 07:14:06,472 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 07:14:06,474 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 07:14:06,484 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 07:14:06,485 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 07:14:06,485 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 07:14:06,488 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 07:14:06,488 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 07:14:06,490 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 07:14:06,491 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 07:14:06,492 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 07:14:06,495 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 07:14:06,496 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 07:14:06,498 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 07:14:06,498 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 07:14:06,514 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 07:14:06,515 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 07:14:06,515 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 07:14:06,518 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 07:14:06,519 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 07:14:06,525 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-10-13 07:14:06,587 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 07:14:06,588 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 07:14:06,589 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 07:14:06,589 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 07:14:06,590 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 07:14:06,590 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 07:14:06,590 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 07:14:06,590 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 07:14:06,590 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 07:14:06,592 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 07:14:06,593 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 07:14:06,594 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 07:14:06,594 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 07:14:06,594 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 07:14:06,594 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 07:14:06,594 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 07:14:06,595 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 07:14:06,595 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 07:14:06,595 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 07:14:06,595 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 07:14:06,596 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 07:14:06,596 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 07:14:06,596 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 07:14:06,596 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 07:14:06,597 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 07:14:06,597 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 07:14:06,597 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:14:06,597 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 07:14:06,598 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 07:14:06,598 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 07:14:06,598 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-13 07:14:06,598 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 07:14:06,598 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 07:14:06,599 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 07:14:06,599 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 07:14:06,599 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1b9a71645175fee79e6d6cd797db38ce6044ffb9 [2021-10-13 07:14:07,063 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 07:14:07,090 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 07:14:07,095 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 07:14:07,096 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 07:14:07,097 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 07:14:07,098 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/loops/invert_string-1.c [2021-10-13 07:14:07,177 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data/145e56d69/a141e6e2daea4010b62f506559c6308f/FLAGce3e0f855 [2021-10-13 07:14:07,824 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 07:14:07,825 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/sv-benchmarks/c/loops/invert_string-1.c [2021-10-13 07:14:07,833 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data/145e56d69/a141e6e2daea4010b62f506559c6308f/FLAGce3e0f855 [2021-10-13 07:14:08,183 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/data/145e56d69/a141e6e2daea4010b62f506559c6308f [2021-10-13 07:14:08,186 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 07:14:08,188 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 07:14:08,202 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 07:14:08,203 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 07:14:08,207 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 07:14:08,208 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,209 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e494b45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08, skipping insertion in model container [2021-10-13 07:14:08,210 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,219 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 07:14:08,235 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 07:14:08,416 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2021-10-13 07:14:08,439 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:14:08,451 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 07:14:08,466 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2021-10-13 07:14:08,477 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:14:08,521 INFO L208 MainTranslator]: Completed translation [2021-10-13 07:14:08,522 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08 WrapperNode [2021-10-13 07:14:08,522 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 07:14:08,523 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 07:14:08,524 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 07:14:08,524 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 07:14:08,563 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,579 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,605 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 07:14:08,606 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 07:14:08,606 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 07:14:08,607 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 07:14:08,618 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,618 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,628 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,628 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,642 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,647 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,649 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,652 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 07:14:08,653 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 07:14:08,654 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 07:14:08,654 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 07:14:08,655 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (1/1) ... [2021-10-13 07:14:08,662 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:14:08,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:14:08,691 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 07:14:08,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 07:14:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-10-13 07:14:08,746 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-13 07:14:08,746 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 07:14:08,746 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 07:14:08,746 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 07:14:08,747 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-10-13 07:14:08,755 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 07:14:09,162 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 07:14:09,162 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-10-13 07:14:09,164 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:14:09 BoogieIcfgContainer [2021-10-13 07:14:09,164 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 07:14:09,166 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 07:14:09,166 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 07:14:09,169 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 07:14:09,169 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 07:14:08" (1/3) ... [2021-10-13 07:14:09,170 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1107e775 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:14:09, skipping insertion in model container [2021-10-13 07:14:09,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:14:08" (2/3) ... [2021-10-13 07:14:09,171 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1107e775 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:14:09, skipping insertion in model container [2021-10-13 07:14:09,171 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:14:09" (3/3) ... [2021-10-13 07:14:09,172 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2021-10-13 07:14:09,178 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 07:14:09,178 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 07:14:09,280 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 07:14:09,287 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-10-13 07:14:09,287 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 07:14:09,308 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:09,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 07:14:09,333 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:09,334 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:14:09,335 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:14:09,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:09,347 INFO L82 PathProgramCache]: Analyzing trace with hash -56209308, now seen corresponding path program 1 times [2021-10-13 07:14:09,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:14:09,362 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2123500812] [2021-10-13 07:14:09,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:09,363 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:14:09,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:14:09,368 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:14:09,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 07:14:09,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:09,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 1 conjunts are in the unsatisfiable core [2021-10-13 07:14:09,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:09,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:09,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:09,641 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:09,642 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:14:09,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2123500812] [2021-10-13 07:14:09,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2123500812] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:14:09,643 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:14:09,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-13 07:14:09,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566014348] [2021-10-13 07:14:09,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-13 07:14:09,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:14:09,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-13 07:14:09,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-13 07:14:09,673 INFO L87 Difference]: Start difference. First operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 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 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:09,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:14:09,690 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2021-10-13 07:14:09,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-13 07:14:09,691 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-10-13 07:14:09,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:14:09,699 INFO L225 Difference]: With dead ends: 37 [2021-10-13 07:14:09,699 INFO L226 Difference]: Without dead ends: 16 [2021-10-13 07:14:09,702 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-13 07:14:09,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-10-13 07:14:09,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-10-13 07:14:09,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 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) [2021-10-13 07:14:09,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-10-13 07:14:09,741 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2021-10-13 07:14:09,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:14:09,742 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-10-13 07:14:09,742 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:09,742 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-10-13 07:14:09,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 07:14:09,743 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:09,744 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:14:09,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:09,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:14:09,956 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:14:09,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:09,961 INFO L82 PathProgramCache]: Analyzing trace with hash -411746854, now seen corresponding path program 1 times [2021-10-13 07:14:09,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:14:09,964 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1649565008] [2021-10-13 07:14:09,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:09,965 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:14:09,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:14:09,966 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:14:09,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 07:14:10,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:10,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:14:10,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:10,118 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:10,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:10,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:10,190 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:14:10,190 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1649565008] [2021-10-13 07:14:10,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1649565008] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:14:10,191 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:14:10,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-10-13 07:14:10,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280192431] [2021-10-13 07:14:10,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:14:10,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:14:10,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:14:10,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:14:10,195 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 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) [2021-10-13 07:14:10,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:14:10,330 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-10-13 07:14:10,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:14:10,331 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 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) Word has length 11 [2021-10-13 07:14:10,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:14:10,332 INFO L225 Difference]: With dead ends: 28 [2021-10-13 07:14:10,332 INFO L226 Difference]: Without dead ends: 21 [2021-10-13 07:14:10,334 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 55.6ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:14:10,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-10-13 07:14:10,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 17. [2021-10-13 07:14:10,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:10,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-10-13 07:14:10,339 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-10-13 07:14:10,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:14:10,340 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-10-13 07:14:10,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 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) [2021-10-13 07:14:10,340 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-10-13 07:14:10,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-13 07:14:10,341 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:10,341 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:14:10,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:10,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:14:10,565 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:14:10,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:10,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1093647992, now seen corresponding path program 1 times [2021-10-13 07:14:10,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:14:10,566 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [887939873] [2021-10-13 07:14:10,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:10,567 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:14:10,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:14:10,568 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:14:10,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 07:14:10,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:10,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:14:10,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:10,719 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:14:10,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:10,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:10,880 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:14:10,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [887939873] [2021-10-13 07:14:10,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [887939873] provided 1 perfect and 1 imperfect interpolant sequences [2021-10-13 07:14:10,881 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-13 07:14:10,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2021-10-13 07:14:10,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599402084] [2021-10-13 07:14:10,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:14:10,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:14:10,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:14:10,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-10-13 07:14:10,884 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:10,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:14:10,970 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-10-13 07:14:10,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:14:10,973 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-10-13 07:14:10,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:14:10,974 INFO L225 Difference]: With dead ends: 36 [2021-10-13 07:14:10,974 INFO L226 Difference]: Without dead ends: 25 [2021-10-13 07:14:10,975 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 91.5ms TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-10-13 07:14:10,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-10-13 07:14:10,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18. [2021-10-13 07:14:10,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1764705882352942) 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) [2021-10-13 07:14:10,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-10-13 07:14:10,983 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2021-10-13 07:14:10,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:14:10,985 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-10-13 07:14:10,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:10,986 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-10-13 07:14:10,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-13 07:14:10,987 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:10,987 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:14:11,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:11,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:14:11,202 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:14:11,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:11,203 INFO L82 PathProgramCache]: Analyzing trace with hash 467501014, now seen corresponding path program 1 times [2021-10-13 07:14:11,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:14:11,204 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1941746634] [2021-10-13 07:14:11,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:11,204 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:14:11,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:14:11,205 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:14:11,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-10-13 07:14:11,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:11,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 17 conjunts are in the unsatisfiable core [2021-10-13 07:14:11,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:11,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-10-13 07:14:11,701 INFO L354 Elim1Store]: treesize reduction 52, result has 36.6 percent of original size [2021-10-13 07:14:11,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 43 [2021-10-13 07:14:12,560 INFO L354 Elim1Store]: treesize reduction 50, result has 12.3 percent of original size [2021-10-13 07:14:12,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 51 [2021-10-13 07:14:12,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:14:12,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:18,090 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:18,091 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 516 treesize of output 405 [2021-10-13 07:14:22,284 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-10-13 07:14:22,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 627 treesize of output 602 [2021-10-13 07:14:22,364 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:22,365 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 658 treesize of output 600 [2021-10-13 07:14:22,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 400 treesize of output 360 [2021-10-13 07:14:33,058 INFO L354 Elim1Store]: treesize reduction 16, result has 56.8 percent of original size [2021-10-13 07:14:33,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 71 treesize of output 73 [2021-10-13 07:14:33,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:14:33,368 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:14:33,368 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1941746634] [2021-10-13 07:14:33,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1941746634] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:33,369 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1714982232] [2021-10-13 07:14:33,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:33,370 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:14:33,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:14:33,375 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:14:33,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-10-13 07:14:33,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:33,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 18 conjunts are in the unsatisfiable core [2021-10-13 07:14:33,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:33,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-10-13 07:14:34,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-10-13 07:14:34,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:34,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2021-10-13 07:14:34,719 INFO L354 Elim1Store]: treesize reduction 50, result has 12.3 percent of original size [2021-10-13 07:14:34,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 77 treesize of output 55 [2021-10-13 07:14:34,748 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:34,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:35,019 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:35,020 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 516 treesize of output 405 [2021-10-13 07:14:35,448 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-10-13 07:14:35,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 627 treesize of output 602 [2021-10-13 07:14:35,500 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:14:35,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 658 treesize of output 600 [2021-10-13 07:14:35,925 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:35,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 31 [2021-10-13 07:14:36,079 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:36,085 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 46 treesize of output 31 [2021-10-13 07:14:36,272 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:36,278 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 31 treesize of output 21 [2021-10-13 07:14:36,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:36,526 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 31 treesize of output 21 [2021-10-13 07:14:36,589 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:36,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 21 [2021-10-13 07:14:36,848 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:36,858 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 46 treesize of output 31 [2021-10-13 07:14:36,957 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:36,969 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 129 treesize of output 94 [2021-10-13 07:14:37,387 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:37,396 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 134 treesize of output 99 [2021-10-13 07:14:37,748 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:37,759 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 129 treesize of output 94 [2021-10-13 07:14:38,703 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:38,713 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 98 treesize of output 73 [2021-10-13 07:14:38,894 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:38,909 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 98 treesize of output 73 [2021-10-13 07:14:39,666 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 249 treesize of output 219 [2021-10-13 07:14:39,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:40,008 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 261 treesize of output 231 [2021-10-13 07:14:40,279 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 249 treesize of output 219 [2021-10-13 07:14:40,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:40,565 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 261 treesize of output 231 [2021-10-13 07:14:40,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:40,894 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 249 treesize of output 219 [2021-10-13 07:14:41,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:41,208 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:41,216 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 46 treesize of output 31 [2021-10-13 07:14:41,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:41,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:41,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:41,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:41,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:14:42,576 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:42,582 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 46 treesize of output 31 [2021-10-13 07:14:42,662 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:42,668 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 46 treesize of output 31 [2021-10-13 07:14:42,775 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:42,781 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 31 treesize of output 21 [2021-10-13 07:14:42,980 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:42,988 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 31 treesize of output 21 [2021-10-13 07:14:43,044 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:43,054 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 31 treesize of output 21 [2021-10-13 07:14:43,222 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:43,229 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 129 treesize of output 94 [2021-10-13 07:14:43,456 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:43,477 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 46 treesize of output 31 [2021-10-13 07:14:43,538 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:43,544 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 129 treesize of output 94 [2021-10-13 07:14:43,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:43,890 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 129 treesize of output 94 [2021-10-13 07:14:44,600 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:44,606 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 114 treesize of output 84 [2021-10-13 07:14:44,895 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:14:44,905 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 114 treesize of output 84 [2021-10-13 07:14:49,759 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 196 treesize of output 176 [2021-10-13 07:14:52,406 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 196 treesize of output 176 [2021-10-13 07:14:54,495 INFO L354 Elim1Store]: treesize reduction 16, result has 56.8 percent of original size [2021-10-13 07:14:54,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 710 treesize of output 654 [2021-10-13 07:15:09,980 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: No corresponding IProgramVar for v_arrayElimCell_43 [2021-10-13 07:15:09,980 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590207054] [2021-10-13 07:15:09,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:15:09,980 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:15:09,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:15:09,983 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:15:09,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-13 07:15:10,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:15:10,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 22 conjunts are in the unsatisfiable core [2021-10-13 07:15:10,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:15:10,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 10 [2021-10-13 07:15:10,248 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 [2021-10-13 07:15:10,408 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 07:15:10,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2021-10-13 07:15:10,960 INFO L354 Elim1Store]: treesize reduction 50, result has 12.3 percent of original size [2021-10-13 07:15:10,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 77 treesize of output 55 [2021-10-13 07:15:10,978 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:15:10,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:15:11,596 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-10-13 07:15:11,596 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 516 treesize of output 1 [2021-10-13 07:15:11,617 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:15:11,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590207054] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:15:11,617 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2021-10-13 07:15:11,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 12, 8] total 26 [2021-10-13 07:15:11,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750670573] [2021-10-13 07:15:11,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-10-13 07:15:11,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:15:11,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-10-13 07:15:11,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=595, Unknown=1, NotChecked=0, Total=756 [2021-10-13 07:15:11,620 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 26 states, 26 states have (on average 1.6923076923076923) internal successors, (44), 26 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:15:28,109 WARN L207 SmtUtils]: Spent 16.16 s on a formula simplification that was a NOOP. DAG size: 42 [2021-10-13 07:15:50,504 WARN L207 SmtUtils]: Spent 8.92 s on a formula simplification that was a NOOP. DAG size: 41 [2021-10-13 07:16:25,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:16:25,041 INFO L93 Difference]: Finished difference Result 78 states and 88 transitions. [2021-10-13 07:16:25,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-10-13 07:16:25,041 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6923076923076923) internal successors, (44), 26 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-10-13 07:16:25,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:16:25,043 INFO L225 Difference]: With dead ends: 78 [2021-10-13 07:16:25,043 INFO L226 Difference]: Without dead ends: 59 [2021-10-13 07:16:25,046 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 612 ImplicationChecksByTransitivity, 65247.8ms TimeCoverageRelationStatistics Valid=611, Invalid=1928, Unknown=11, NotChecked=0, Total=2550 [2021-10-13 07:16:25,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-10-13 07:16:25,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 25. [2021-10-13 07:16:25,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 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) [2021-10-13 07:16:25,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-10-13 07:16:25,055 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 15 [2021-10-13 07:16:25,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:16:25,055 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-10-13 07:16:25,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.6923076923076923) internal successors, (44), 26 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:16:25,056 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-10-13 07:16:25,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-10-13 07:16:25,057 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:16:25,057 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:16:25,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-13 07:16:25,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-10-13 07:16:25,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (6)] Forceful destruction successful, exit code 0 [2021-10-13 07:16:25,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:16:25,666 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:16:25,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:16:25,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1570853842, now seen corresponding path program 2 times [2021-10-13 07:16:25,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:16:25,667 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [742153800] [2021-10-13 07:16:25,667 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:16:25,667 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:16:25,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:16:25,668 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:16:25,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-10-13 07:16:25,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:16:25,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:16:25,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 22 conjunts are in the unsatisfiable core [2021-10-13 07:16:25,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:16:25,888 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 [2021-10-13 07:16:26,279 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 19 [2021-10-13 07:16:26,723 INFO L354 Elim1Store]: treesize reduction 18, result has 14.3 percent of original size [2021-10-13 07:16:26,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 69 treesize of output 48 [2021-10-13 07:16:26,796 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:16:26,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:16:27,206 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:16:27,207 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 82 treesize of output 78 [2021-10-13 07:16:27,371 INFO L354 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2021-10-13 07:16:27,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 28 [2021-10-13 07:16:27,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 42 [2021-10-13 07:16:27,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 36 [2021-10-13 07:16:27,500 INFO L354 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2021-10-13 07:16:27,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 91 treesize of output 80 [2021-10-13 07:16:28,467 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 07:16:28,467 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:16:28,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [742153800] [2021-10-13 07:16:28,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [742153800] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:16:28,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [383692474] [2021-10-13 07:16:28,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:16:28,468 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:16:28,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:16:28,471 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:16:28,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-10-13 07:16:28,773 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-13 07:16:28,774 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302411113] [2021-10-13 07:16:28,774 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:16:28,774 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:16:28,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:16:28,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 1 [2021-10-13 07:16:28,786 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:16:28,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-13 07:16:29,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:16:29,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:16:29,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 20 conjunts are in the unsatisfiable core [2021-10-13 07:16:29,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:16:29,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-10-13 07:16:29,854 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 19 [2021-10-13 07:16:30,267 INFO L354 Elim1Store]: treesize reduction 18, result has 14.3 percent of original size [2021-10-13 07:16:30,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 69 treesize of output 48 [2021-10-13 07:16:30,284 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 07:16:30,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:16:30,415 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:16:30,415 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 82 treesize of output 78 [2021-10-13 07:16:30,433 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 47 treesize of output 42 [2021-10-13 07:16:30,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 36 [2021-10-13 07:16:30,529 INFO L354 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2021-10-13 07:16:30,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 104 treesize of output 93 [2021-10-13 07:16:30,883 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 07:16:30,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302411113] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:16:30,883 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2021-10-13 07:16:30,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 11, 10] total 27 [2021-10-13 07:16:30,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256783567] [2021-10-13 07:16:30,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-13 07:16:30,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:16:30,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-13 07:16:30,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=585, Unknown=0, NotChecked=0, Total=702 [2021-10-13 07:16:30,886 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 27 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) [2021-10-13 07:16:41,459 WARN L207 SmtUtils]: Spent 8.11 s on a formula simplification. DAG size of input: 50 DAG size of output: 39 [2021-10-13 07:16:49,905 WARN L207 SmtUtils]: Spent 8.14 s on a formula simplification. DAG size of input: 52 DAG size of output: 41 [2021-10-13 07:16:55,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:16:55,147 INFO L93 Difference]: Finished difference Result 85 states and 92 transitions. [2021-10-13 07:16:55,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-10-13 07:16:55,162 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 27 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 19 [2021-10-13 07:16:55,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:16:55,164 INFO L225 Difference]: With dead ends: 85 [2021-10-13 07:16:55,164 INFO L226 Difference]: Without dead ends: 83 [2021-10-13 07:16:55,167 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1031 ImplicationChecksByTransitivity, 24767.8ms TimeCoverageRelationStatistics Valid=797, Invalid=3363, Unknown=0, NotChecked=0, Total=4160 [2021-10-13 07:16:55,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-13 07:16:55,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 29. [2021-10-13 07:16:55,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 28 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:16:55,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2021-10-13 07:16:55,178 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 19 [2021-10-13 07:16:55,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:16:55,178 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2021-10-13 07:16:55,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 27 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) [2021-10-13 07:16:55,179 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2021-10-13 07:16:55,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-10-13 07:16:55,180 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:16:55,180 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:16:55,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-10-13 07:16:55,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-13 07:16:55,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:16:55,595 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:16:55,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:16:55,595 INFO L82 PathProgramCache]: Analyzing trace with hash 1541946442, now seen corresponding path program 1 times [2021-10-13 07:16:55,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:16:55,596 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2054320871] [2021-10-13 07:16:55,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:16:55,596 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:16:55,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:16:55,597 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:16:55,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-10-13 07:16:55,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:16:55,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 07:16:55,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:16:55,964 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:16:55,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:16:56,223 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:16:56,223 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:16:56,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2054320871] [2021-10-13 07:16:56,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2054320871] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:16:56,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [649745092] [2021-10-13 07:16:56,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:16:56,224 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:16:56,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:16:56,225 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:16:56,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-10-13 07:16:56,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:16:56,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 07:16:56,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:16:56,791 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:16:56,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:16:57,185 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:16:57,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [649745092] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:16:57,186 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175230795] [2021-10-13 07:16:57,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:16:57,186 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:16:57,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:16:57,187 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:16:57,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-13 07:16:57,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:16:57,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 07:16:57,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:16:57,568 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:16:57,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:16:57,991 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 07:16:57,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175230795] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:16:57,991 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:16:57,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 10, 9, 7, 8] total 26 [2021-10-13 07:16:57,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242096057] [2021-10-13 07:16:57,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-10-13 07:16:57,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:16:57,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-10-13 07:16:57,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=473, Unknown=0, NotChecked=0, Total=650 [2021-10-13 07:16:57,994 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 26 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:16:59,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:16:59,103 INFO L93 Difference]: Finished difference Result 99 states and 111 transitions. [2021-10-13 07:16:59,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-10-13 07:16:59,105 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 26 states have internal predecessors, (56), 0 states have call successors, (0), 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 [2021-10-13 07:16:59,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:16:59,106 INFO L225 Difference]: With dead ends: 99 [2021-10-13 07:16:59,106 INFO L226 Difference]: Without dead ends: 87 [2021-10-13 07:16:59,108 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 1357.3ms TimeCoverageRelationStatistics Valid=469, Invalid=1091, Unknown=0, NotChecked=0, Total=1560 [2021-10-13 07:16:59,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-10-13 07:16:59,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 51. [2021-10-13 07:16:59,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.18) internal successors, (59), 50 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:16:59,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2021-10-13 07:16:59,124 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 21 [2021-10-13 07:16:59,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:16:59,124 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2021-10-13 07:16:59,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 26 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:16:59,125 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2021-10-13 07:16:59,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-10-13 07:16:59,126 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:16:59,126 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:16:59,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-10-13 07:16:59,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-10-13 07:16:59,558 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-10-13 07:16:59,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:16:59,733 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 07:16:59,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:16:59,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1262940008, now seen corresponding path program 2 times [2021-10-13 07:16:59,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:16:59,734 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [105706089] [2021-10-13 07:16:59,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:16:59,735 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:16:59,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:16:59,736 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:16:59,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-10-13 07:17:00,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:17:00,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-10-13 07:17:00,035 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-13 07:17:00,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-13 07:17:00,174 INFO L133 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-10-13 07:17:00,175 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-13 07:17:00,176 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-13 07:17:00,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-10-13 07:17:00,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:17:00,384 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 07:17:00,441 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 07:17:00 BoogieIcfgContainer [2021-10-13 07:17:00,441 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 07:17:00,442 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 07:17:00,442 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 07:17:00,442 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 07:17:00,443 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:14:09" (3/4) ... [2021-10-13 07:17:00,445 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-13 07:17:00,497 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_caf9f53f-7093-4b66-940f-0bc6fe8fa0ec/bin/utaipan-q2qaUkNPG8/witness.graphml [2021-10-13 07:17:00,498 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 07:17:00,499 INFO L168 Benchmark]: Toolchain (without parser) took 172310.86 ms. Allocated memory was 50.3 MB in the beginning and 79.7 MB in the end (delta: 29.4 MB). Free memory was 27.1 MB in the beginning and 40.3 MB in the end (delta: -13.2 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. [2021-10-13 07:17:00,499 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 50.3 MB. Free memory was 30.9 MB in the beginning and 30.8 MB in the end (delta: 38.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:17:00,500 INFO L168 Benchmark]: CACSL2BoogieTranslator took 320.06 ms. Allocated memory was 50.3 MB in the beginning and 65.0 MB in the end (delta: 14.7 MB). Free memory was 26.9 MB in the beginning and 49.0 MB in the end (delta: -22.1 MB). Peak memory consumption was 8.3 MB. Max. memory is 16.1 GB. [2021-10-13 07:17:00,500 INFO L168 Benchmark]: Boogie Procedure Inliner took 81.53 ms. Allocated memory is still 65.0 MB. Free memory was 48.7 MB in the beginning and 47.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:17:00,500 INFO L168 Benchmark]: Boogie Preprocessor took 46.24 ms. Allocated memory is still 65.0 MB. Free memory was 47.2 MB in the beginning and 45.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:17:00,501 INFO L168 Benchmark]: RCFGBuilder took 511.01 ms. Allocated memory is still 65.0 MB. Free memory was 45.9 MB in the beginning and 34.8 MB in the end (delta: 11.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 07:17:00,501 INFO L168 Benchmark]: TraceAbstraction took 171275.48 ms. Allocated memory was 65.0 MB in the beginning and 79.7 MB in the end (delta: 14.7 MB). Free memory was 34.2 MB in the beginning and 43.1 MB in the end (delta: -8.9 MB). Peak memory consumption was 6.4 MB. Max. memory is 16.1 GB. [2021-10-13 07:17:00,502 INFO L168 Benchmark]: Witness Printer took 55.88 ms. Allocated memory is still 79.7 MB. Free memory was 43.1 MB in the beginning and 40.3 MB in the end (delta: 2.8 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-13 07:17:00,504 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 50.3 MB. Free memory was 30.9 MB in the beginning and 30.8 MB in the end (delta: 38.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 320.06 ms. Allocated memory was 50.3 MB in the beginning and 65.0 MB in the end (delta: 14.7 MB). Free memory was 26.9 MB in the beginning and 49.0 MB in the end (delta: -22.1 MB). Peak memory consumption was 8.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 81.53 ms. Allocated memory is still 65.0 MB. Free memory was 48.7 MB in the beginning and 47.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 46.24 ms. Allocated memory is still 65.0 MB. Free memory was 47.2 MB in the beginning and 45.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 511.01 ms. Allocated memory is still 65.0 MB. Free memory was 45.9 MB in the beginning and 34.8 MB in the end (delta: 11.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 171275.48 ms. Allocated memory was 65.0 MB in the beginning and 79.7 MB in the end (delta: 14.7 MB). Free memory was 34.2 MB in the beginning and 43.1 MB in the end (delta: -8.9 MB). Peak memory consumption was 6.4 MB. Max. memory is 16.1 GB. * Witness Printer took 55.88 ms. Allocated memory is still 79.7 MB. Free memory was 43.1 MB in the beginning and 40.3 MB in the end (delta: 2.8 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 [L35] COND TRUE i