./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_palindrome_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_palindrome_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp --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 270a2842345dc5b188d8b64dce3436ccc5910bc1472a41053bc5c00e7f4ceeb6 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:59:14,022 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:59:14,159 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:59:14,172 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:59:14,173 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:59:14,221 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:59:14,222 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:59:14,222 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:59:14,224 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:59:14,231 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:59:14,232 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:59:14,233 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:59:14,234 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:59:14,236 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:59:14,236 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:59:14,237 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:59:14,237 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:59:14,238 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:59:14,238 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:59:14,239 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:59:14,239 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:59:14,240 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:59:14,241 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:59:14,242 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:59:14,242 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:59:14,243 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:59:14,243 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:59:14,244 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:59:14,244 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:59:14,244 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:59:14,246 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:59:14,246 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:59:14,247 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:59:14,247 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:59:14,247 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:59:14,247 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:59:14,248 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:59:14,248 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:59:14,248 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:59:14,249 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:59:14,249 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:59:14,249 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:59:14,250 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:59:14,250 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:59:14,251 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:59:14,251 INFO L153 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_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 270a2842345dc5b188d8b64dce3436ccc5910bc1472a41053bc5c00e7f4ceeb6 [2023-11-06 20:59:14,546 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:59:14,581 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:59:14,584 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:59:14,586 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:59:14,587 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:59:14,589 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2023-11-06 20:59:17,814 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:59:18,029 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:59:18,030 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/sv-benchmarks/c/array-examples/standard_palindrome_ground.i [2023-11-06 20:59:18,038 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/data/b7aca8f8a/db26642bb997431bafbbeee68d87d411/FLAG83f75dddd [2023-11-06 20:59:18,054 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/data/b7aca8f8a/db26642bb997431bafbbeee68d87d411 [2023-11-06 20:59:18,057 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:59:18,059 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:59:18,060 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:59:18,061 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:59:18,067 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:59:18,068 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,069 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e66b299 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18, skipping insertion in model container [2023-11-06 20:59:18,070 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,093 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:59:18,286 WARN L240 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_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/sv-benchmarks/c/array-examples/standard_palindrome_ground.i[819,832] [2023-11-06 20:59:18,301 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:59:18,310 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:59:18,321 WARN L240 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_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/sv-benchmarks/c/array-examples/standard_palindrome_ground.i[819,832] [2023-11-06 20:59:18,328 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:59:18,343 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:59:18,343 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18 WrapperNode [2023-11-06 20:59:18,343 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:59:18,345 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:59:18,345 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:59:18,345 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:59:18,351 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,357 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,375 INFO L138 Inliner]: procedures = 16, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 58 [2023-11-06 20:59:18,375 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:59:18,376 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:59:18,376 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:59:18,376 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:59:18,384 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,384 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,386 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,387 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,392 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,396 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,397 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,398 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,400 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:59:18,401 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:59:18,401 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:59:18,401 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:59:18,402 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (1/1) ... [2023-11-06 20:59:18,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:59:18,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:18,461 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:59:18,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:59:18,513 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:59:18,513 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:59:18,514 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 20:59:18,514 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 20:59:18,514 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:59:18,514 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:59:18,516 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 20:59:18,517 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 20:59:18,593 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:59:18,596 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:59:18,739 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:59:18,779 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:59:18,780 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-06 20:59:18,782 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:59:18 BoogieIcfgContainer [2023-11-06 20:59:18,783 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:59:18,785 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:59:18,786 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:59:18,796 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:59:18,797 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:59:18" (1/3) ... [2023-11-06 20:59:18,798 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fd0520f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:59:18, skipping insertion in model container [2023-11-06 20:59:18,798 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:59:18" (2/3) ... [2023-11-06 20:59:18,798 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fd0520f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:59:18, skipping insertion in model container [2023-11-06 20:59:18,798 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:59:18" (3/3) ... [2023-11-06 20:59:18,800 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2023-11-06 20:59:18,821 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:59:18,821 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:59:18,881 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:59:18,888 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@7dfd9650, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:59:18,889 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:59:18,892 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) [2023-11-06 20:59:18,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-06 20:59:18,897 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:18,898 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-06 20:59:18,898 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:18,904 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:18,904 INFO L85 PathProgramCache]: Analyzing trace with hash -1568606099, now seen corresponding path program 1 times [2023-11-06 20:59:18,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:18,915 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891337553] [2023-11-06 20:59:18,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:18,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:19,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:19,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:59:19,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:19,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891337553] [2023-11-06 20:59:19,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891337553] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:59:19,248 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:59:19,248 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:59:19,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145094048] [2023-11-06 20:59:19,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:59:19,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:59:19,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:19,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:59:19,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:59:19,344 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) [2023-11-06 20:59:19,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:19,418 INFO L93 Difference]: Finished difference Result 18 states and 25 transitions. [2023-11-06 20:59:19,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:59:19,421 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 [2023-11-06 20:59:19,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:19,429 INFO L225 Difference]: With dead ends: 18 [2023-11-06 20:59:19,442 INFO L226 Difference]: Without dead ends: 10 [2023-11-06 20:59:19,445 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:59:19,449 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:19,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:19,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-11-06 20:59:19,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-11-06 20:59:19,496 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) [2023-11-06 20:59:19,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2023-11-06 20:59:19,498 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 6 [2023-11-06 20:59:19,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:19,499 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2023-11-06 20:59:19,500 INFO L496 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) [2023-11-06 20:59:19,500 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2023-11-06 20:59:19,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 20:59:19,501 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:19,501 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:19,501 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:59:19,502 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:19,503 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:19,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1735287936, now seen corresponding path program 1 times [2023-11-06 20:59:19,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:19,504 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741283561] [2023-11-06 20:59:19,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:19,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:19,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:19,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:59:19,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:19,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741283561] [2023-11-06 20:59:19,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741283561] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:19,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290396903] [2023-11-06 20:59:19,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:19,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:19,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:19,659 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:19,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:59:19,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:19,746 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-06 20:59:19,758 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:19,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:59:19,805 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:19,839 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:59:19,840 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290396903] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:19,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1633069907] [2023-11-06 20:59:19,872 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:59:19,872 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:19,875 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:19,880 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:19,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:20,444 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:20,602 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '103#(and (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 399996) |ULTIMATE.start_main_#t~mem7#1|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (<= 50000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-06 20:59:20,602 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:20,603 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:20,603 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2023-11-06 20:59:20,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736376315] [2023-11-06 20:59:20,605 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:20,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:59:20,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:20,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:59:20,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-11-06 20:59:20,608 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:20,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:20,656 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2023-11-06 20:59:20,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:59:20,657 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 20:59:20,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:20,658 INFO L225 Difference]: With dead ends: 21 [2023-11-06 20:59:20,658 INFO L226 Difference]: Without dead ends: 14 [2023-11-06 20:59:20,660 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-11-06 20:59:20,663 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 6 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:20,665 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 12 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:59:20,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-06 20:59:20,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-06 20:59:20,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 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) [2023-11-06 20:59:20,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2023-11-06 20:59:20,676 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2023-11-06 20:59:20,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:20,677 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2023-11-06 20:59:20,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:20,678 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2023-11-06 20:59:20,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-06 20:59:20,679 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:20,679 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:20,690 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-06 20:59:20,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:20,894 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:20,896 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:20,896 INFO L85 PathProgramCache]: Analyzing trace with hash 1325194765, now seen corresponding path program 2 times [2023-11-06 20:59:20,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:20,901 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512989584] [2023-11-06 20:59:20,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:20,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:20,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:21,139 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:59:21,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:21,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512989584] [2023-11-06 20:59:21,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512989584] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:21,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126215696] [2023-11-06 20:59:21,149 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:59:21,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:21,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:21,156 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:21,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:59:21,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 20:59:21,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:21,242 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:59:21,245 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:21,259 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:59:21,259 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:21,301 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:59:21,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126215696] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:21,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [50707461] [2023-11-06 20:59:21,306 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:59:21,306 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:21,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:21,307 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:21,307 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:21,547 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:21,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '239#(and (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 399996) |ULTIMATE.start_main_#t~mem7#1|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (<= 50000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-06 20:59:21,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:21,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:21,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2023-11-06 20:59:21,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181253439] [2023-11-06 20:59:21,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:21,702 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-06 20:59:21,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:21,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-06 20:59:21,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2023-11-06 20:59:21,704 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:21,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:21,757 INFO L93 Difference]: Finished difference Result 32 states and 45 transitions. [2023-11-06 20:59:21,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-06 20:59:21,758 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-06 20:59:21,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:21,759 INFO L225 Difference]: With dead ends: 32 [2023-11-06 20:59:21,759 INFO L226 Difference]: Without dead ends: 24 [2023-11-06 20:59:21,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2023-11-06 20:59:21,761 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:21,762 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:59:21,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-06 20:59:21,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-06 20:59:21,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:21,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2023-11-06 20:59:21,769 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 12 [2023-11-06 20:59:21,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:21,769 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2023-11-06 20:59:21,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:21,770 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2023-11-06 20:59:21,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-06 20:59:21,771 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:21,771 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:21,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:21,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-06 20:59:21,977 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:21,977 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:21,977 INFO L85 PathProgramCache]: Analyzing trace with hash 887484397, now seen corresponding path program 3 times [2023-11-06 20:59:21,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:21,978 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150179008] [2023-11-06 20:59:21,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:21,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:22,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:22,253 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-06 20:59:22,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:22,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150179008] [2023-11-06 20:59:22,253 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1150179008] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:22,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409989593] [2023-11-06 20:59:22,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:59:22,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:22,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:22,255 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:22,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:59:22,361 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:59:22,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:22,363 INFO L262 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-06 20:59:22,365 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:22,390 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-06 20:59:22,390 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:22,578 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-06 20:59:22,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1409989593] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:22,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1829450538] [2023-11-06 20:59:22,580 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:59:22,580 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:22,581 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:22,581 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:22,581 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:22,762 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:22,912 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '487#(and (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 399996) |ULTIMATE.start_main_#t~mem7#1|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (<= 50000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-06 20:59:22,913 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:22,913 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:22,913 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2023-11-06 20:59:22,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158972547] [2023-11-06 20:59:22,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:22,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-06 20:59:22,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:22,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-06 20:59:22,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=348, Unknown=0, NotChecked=0, Total=552 [2023-11-06 20:59:22,916 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 20 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:23,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:23,016 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2023-11-06 20:59:23,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-06 20:59:23,017 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-06 20:59:23,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:23,018 INFO L225 Difference]: With dead ends: 49 [2023-11-06 20:59:23,018 INFO L226 Difference]: Without dead ends: 35 [2023-11-06 20:59:23,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=204, Invalid=348, Unknown=0, NotChecked=0, Total=552 [2023-11-06 20:59:23,021 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 6 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:23,022 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 12 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:23,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-06 20:59:23,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-11-06 20:59:23,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:23,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2023-11-06 20:59:23,039 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 22 [2023-11-06 20:59:23,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:23,039 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2023-11-06 20:59:23,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:23,045 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2023-11-06 20:59:23,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-06 20:59:23,048 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:23,048 INFO L195 NwaCegarLoop]: trace histogram [18, 9, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:23,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:23,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:23,255 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:23,255 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:23,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1840066658, now seen corresponding path program 4 times [2023-11-06 20:59:23,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:23,258 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358408136] [2023-11-06 20:59:23,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:23,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:23,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:23,958 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-06 20:59:23,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:23,958 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358408136] [2023-11-06 20:59:23,958 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358408136] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:23,958 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648529881] [2023-11-06 20:59:23,959 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:59:23,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:23,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:23,962 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:23,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:59:24,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:24,105 INFO L262 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-06 20:59:24,114 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:24,162 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-06 20:59:24,162 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:24,804 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-06 20:59:24,804 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648529881] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:24,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [494741558] [2023-11-06 20:59:24,807 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:59:24,807 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:24,807 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:24,807 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:24,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:24,975 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:25,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '877#(and (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 399996) |ULTIMATE.start_main_#t~mem7#1|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (<= 50000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-06 20:59:25,128 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:25,129 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:25,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2023-11-06 20:59:25,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806769959] [2023-11-06 20:59:25,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:25,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-11-06 20:59:25,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:25,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-11-06 20:59:25,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=794, Invalid=1098, Unknown=0, NotChecked=0, Total=1892 [2023-11-06 20:59:25,133 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 40 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:25,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:25,325 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2023-11-06 20:59:25,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-11-06 20:59:25,326 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2023-11-06 20:59:25,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:25,327 INFO L225 Difference]: With dead ends: 80 [2023-11-06 20:59:25,327 INFO L226 Difference]: Without dead ends: 65 [2023-11-06 20:59:25,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=794, Invalid=1098, Unknown=0, NotChecked=0, Total=1892 [2023-11-06 20:59:25,329 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 12 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:25,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 12 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:59:25,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-06 20:59:25,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-11-06 20:59:25,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:25,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2023-11-06 20:59:25,340 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 33 [2023-11-06 20:59:25,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:25,341 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2023-11-06 20:59:25,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:25,341 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2023-11-06 20:59:25,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-11-06 20:59:25,343 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:25,344 INFO L195 NwaCegarLoop]: trace histogram [38, 19, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:25,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:25,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:25,554 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:25,554 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:25,555 INFO L85 PathProgramCache]: Analyzing trace with hash -1113335938, now seen corresponding path program 5 times [2023-11-06 20:59:25,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:25,555 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694297290] [2023-11-06 20:59:25,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:25,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:25,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:59:27,592 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-11-06 20:59:27,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:59:27,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694297290] [2023-11-06 20:59:27,597 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694297290] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:59:27,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999111249] [2023-11-06 20:59:27,597 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:59:27,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:59:27,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:59:27,599 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:59:27,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:59:47,880 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-11-06 20:59:47,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:59:47,895 INFO L262 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-06 20:59:47,899 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:59:47,954 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2023-11-06 20:59:47,954 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:59:49,191 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2023-11-06 20:59:49,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999111249] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:59:49,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1312324863] [2023-11-06 20:59:49,197 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:59:49,197 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:59:49,197 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:59:49,198 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:59:49,198 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:59:49,396 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:59:49,679 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1590#(and (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 399996) |ULTIMATE.start_main_#t~mem7#1|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (<= 50000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-06 20:59:49,680 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:59:49,680 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:59:49,680 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 22, 22] total 61 [2023-11-06 20:59:49,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126761967] [2023-11-06 20:59:49,681 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:59:49,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2023-11-06 20:59:49,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:59:49,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2023-11-06 20:59:49,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1844, Invalid=2316, Unknown=0, NotChecked=0, Total=4160 [2023-11-06 20:59:49,691 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 61 states, 61 states have (on average 1.459016393442623) internal successors, (89), 61 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:50,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:59:50,120 INFO L93 Difference]: Finished difference Result 151 states and 215 transitions. [2023-11-06 20:59:50,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2023-11-06 20:59:50,121 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.459016393442623) internal successors, (89), 61 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2023-11-06 20:59:50,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:59:50,125 INFO L225 Difference]: With dead ends: 151 [2023-11-06 20:59:50,125 INFO L226 Difference]: Without dead ends: 126 [2023-11-06 20:59:50,128 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1844, Invalid=2316, Unknown=0, NotChecked=0, Total=4160 [2023-11-06 20:59:50,129 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:59:50,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:59:50,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2023-11-06 20:59:50,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2023-11-06 20:59:50,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.024) internal successors, (128), 125 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:50,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 128 transitions. [2023-11-06 20:59:50,168 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 128 transitions. Word has length 63 [2023-11-06 20:59:50,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:59:50,169 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 128 transitions. [2023-11-06 20:59:50,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.459016393442623) internal successors, (89), 61 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:59:50,169 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 128 transitions. [2023-11-06 20:59:50,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-11-06 20:59:50,179 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:59:50,179 INFO L195 NwaCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1] [2023-11-06 20:59:50,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 20:59:50,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c9e81a29-7ad4-47d6-9903-3ecf6f18ad5e/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 20:59:50,380 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:59:50,380 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:59:50,381 INFO L85 PathProgramCache]: Analyzing trace with hash -2093612000, now seen corresponding path program 6 times [2023-11-06 20:59:50,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:59:50,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327558461] [2023-11-06 20:59:50,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:59:50,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:59:50,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat