./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/nested_1-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/nested_1-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --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 8828f6ff39cd2bcfba4fe3d04f0119d60137bcad91eabef2e2b840cbd0802b98 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:51:33,335 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:51:33,401 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:51:33,407 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:51:33,408 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:51:33,437 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:51:33,438 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:51:33,438 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:51:33,439 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:51:33,440 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:51:33,441 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:51:33,441 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:51:33,442 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:51:33,443 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:51:33,443 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:51:33,444 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:51:33,445 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:51:33,445 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:51:33,446 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:51:33,447 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:51:33,447 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:51:33,448 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:51:33,449 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:51:33,450 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:51:33,450 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:51:33,451 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:51:33,452 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:51:33,452 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:51:33,453 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:51:33,454 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:51:33,454 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:51:33,455 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:51:33,455 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:51:33,456 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:51:33,457 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:51:33,457 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:51:33,457 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:51:33,458 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:51:33,458 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:51:33,459 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:51:33,459 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:51:33,459 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:51:33,460 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:51:33,460 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:51:33,460 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:51:33,461 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_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8828f6ff39cd2bcfba4fe3d04f0119d60137bcad91eabef2e2b840cbd0802b98 [2023-11-12 00:51:33,702 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:51:33,742 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:51:33,744 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:51:33,746 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:51:33,746 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:51:33,749 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/loop-acceleration/nested_1-2.c [2023-11-12 00:51:36,845 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:51:37,041 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:51:37,043 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/sv-benchmarks/c/loop-acceleration/nested_1-2.c [2023-11-12 00:51:37,055 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/data/1b81dcf6b/c5fc3f25843f46738499fe611a8395d5/FLAG61b9fee0e [2023-11-12 00:51:37,087 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/data/1b81dcf6b/c5fc3f25843f46738499fe611a8395d5 [2023-11-12 00:51:37,095 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:51:37,098 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:51:37,102 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:51:37,102 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:51:37,109 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:51:37,112 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,113 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d291287 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37, skipping insertion in model container [2023-11-12 00:51:37,114 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,138 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:51:37,336 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_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/sv-benchmarks/c/loop-acceleration/nested_1-2.c[322,335] [2023-11-12 00:51:37,350 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:51:37,363 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:51:37,375 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_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/sv-benchmarks/c/loop-acceleration/nested_1-2.c[322,335] [2023-11-12 00:51:37,378 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:51:37,394 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:51:37,394 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37 WrapperNode [2023-11-12 00:51:37,394 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:51:37,396 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:51:37,396 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:51:37,396 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:51:37,406 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,415 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,431 INFO L138 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 33 [2023-11-12 00:51:37,431 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:51:37,432 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:51:37,432 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:51:37,433 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:51:37,443 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,444 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,445 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,446 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,449 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,453 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,454 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,455 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,456 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:51:37,457 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:51:37,457 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:51:37,457 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:51:37,458 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (1/1) ... [2023-11-12 00:51:37,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:51:37,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:51:37,497 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:51:37,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:51:37,544 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:51:37,545 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:51:37,545 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:51:37,546 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:51:37,637 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:51:37,640 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:51:37,841 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:51:37,902 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:51:37,903 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-12 00:51:37,906 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:51:37 BoogieIcfgContainer [2023-11-12 00:51:37,906 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:51:37,910 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:51:37,910 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:51:37,915 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:51:37,915 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:51:37" (1/3) ... [2023-11-12 00:51:37,916 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f5f4844 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:51:37, skipping insertion in model container [2023-11-12 00:51:37,916 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:51:37" (2/3) ... [2023-11-12 00:51:37,917 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f5f4844 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:51:37, skipping insertion in model container [2023-11-12 00:51:37,918 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:51:37" (3/3) ... [2023-11-12 00:51:37,920 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_1-2.c [2023-11-12 00:51:37,942 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:51:37,943 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:51:38,012 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:51:38,024 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=LoopHeads, 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;@4ed3b0ca, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:51:38,025 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:51:38,030 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:38,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:51:38,037 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:38,039 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:51:38,040 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:51:38,049 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:38,049 INFO L85 PathProgramCache]: Analyzing trace with hash 2252617, now seen corresponding path program 1 times [2023-11-12 00:51:38,061 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:38,063 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060911651] [2023-11-12 00:51:38,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:38,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:38,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:38,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:51:38,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:38,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060911651] [2023-11-12 00:51:38,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2060911651] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:38,340 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:38,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:51:38,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94600504] [2023-11-12 00:51:38,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:38,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:51:38,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:38,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:51:38,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:51:38,381 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:38,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:38,415 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2023-11-12 00:51:38,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:51:38,418 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 00:51:38,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:38,426 INFO L225 Difference]: With dead ends: 15 [2023-11-12 00:51:38,426 INFO L226 Difference]: Without dead ends: 8 [2023-11-12 00:51:38,429 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 [2023-11-12 00:51:38,433 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:38,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 8 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:51:38,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-12 00:51:38,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2023-11-12 00:51:38,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:38,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2023-11-12 00:51:38,467 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2023-11-12 00:51:38,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:38,467 INFO L495 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2023-11-12 00:51:38,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:38,468 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2023-11-12 00:51:38,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:51:38,469 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:38,469 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 00:51:38,469 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:51:38,470 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:51:38,470 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:38,470 INFO L85 PathProgramCache]: Analyzing trace with hash 2130164165, now seen corresponding path program 1 times [2023-11-12 00:51:38,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:38,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411925011] [2023-11-12 00:51:38,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:38,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:38,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:38,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:51:38,542 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:38,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411925011] [2023-11-12 00:51:38,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411925011] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:51:38,543 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:51:38,543 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:51:38,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569426203] [2023-11-12 00:51:38,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:51:38,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:51:38,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:38,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:51:38,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:51:38,547 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 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) [2023-11-12 00:51:38,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:38,564 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2023-11-12 00:51:38,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:51:38,565 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 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 [2023-11-12 00:51:38,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:38,566 INFO L225 Difference]: With dead ends: 13 [2023-11-12 00:51:38,566 INFO L226 Difference]: Without dead ends: 8 [2023-11-12 00:51:38,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:51:38,569 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:38,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:51:38,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-12 00:51:38,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-12 00:51:38,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:38,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2023-11-12 00:51:38,574 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2023-11-12 00:51:38,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:38,575 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2023-11-12 00:51:38,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 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) [2023-11-12 00:51:38,575 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2023-11-12 00:51:38,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:51:38,576 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:38,576 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:51:38,576 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:51:38,576 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:51:38,577 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:38,577 INFO L85 PathProgramCache]: Analyzing trace with hash 1585602295, now seen corresponding path program 1 times [2023-11-12 00:51:38,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:38,578 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338309323] [2023-11-12 00:51:38,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:38,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:38,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:38,722 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:51:38,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:38,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338309323] [2023-11-12 00:51:38,723 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1338309323] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:51:38,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418318308] [2023-11-12 00:51:38,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:38,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:51:38,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:51:38,735 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:51:38,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:51:38,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:38,805 INFO L262 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:51:38,810 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:51:38,865 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:51:38,865 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:51:38,927 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:51:38,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418318308] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:51:38,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [542154431] [2023-11-12 00:51:38,956 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-12 00:51:38,956 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:51:38,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:51:38,967 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:51:38,971 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:51:39,608 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:51:39,711 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '121#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:51:39,711 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:51:39,712 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:51:39,712 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2023-11-12 00:51:39,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293119858] [2023-11-12 00:51:39,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:51:39,713 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 00:51:39,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:39,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 00:51:39,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:51:39,715 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:39,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:39,921 INFO L93 Difference]: Finished difference Result 27 states and 39 transitions. [2023-11-12 00:51:39,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-12 00:51:39,922 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 00:51:39,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:39,923 INFO L225 Difference]: With dead ends: 27 [2023-11-12 00:51:39,923 INFO L226 Difference]: Without dead ends: 21 [2023-11-12 00:51:39,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2023-11-12 00:51:39,929 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 16 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:39,930 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 10 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:51:39,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-12 00:51:39,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-12 00:51:39,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 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) [2023-11-12 00:51:39,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-12 00:51:39,939 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 7 [2023-11-12 00:51:39,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:39,939 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-12 00:51:39,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:39,940 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-12 00:51:39,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-12 00:51:39,941 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:39,941 INFO L195 NwaCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1] [2023-11-12 00:51:39,953 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:51:40,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:51:40,148 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:51:40,148 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:40,149 INFO L85 PathProgramCache]: Analyzing trace with hash -140644807, now seen corresponding path program 2 times [2023-11-12 00:51:40,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:40,149 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663668373] [2023-11-12 00:51:40,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:40,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:40,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:40,410 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-12 00:51:40,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:40,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663668373] [2023-11-12 00:51:40,411 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663668373] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:51:40,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1155498734] [2023-11-12 00:51:40,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:51:40,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:51:40,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:51:40,413 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:51:40,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:51:40,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-12 00:51:40,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:51:40,489 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-12 00:51:40,491 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:51:40,522 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 25 proven. 22 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-11-12 00:51:40,522 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:51:40,571 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-12 00:51:40,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1155498734] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:51:40,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1001952199] [2023-11-12 00:51:40,574 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-12 00:51:40,574 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:51:40,574 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:51:40,575 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:51:40,575 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:51:40,967 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:51:41,068 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '351#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:51:41,068 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:51:41,069 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:51:41,069 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-12 00:51:41,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093707309] [2023-11-12 00:51:41,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:51:41,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:51:41,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:41,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:51:41,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:51:41,071 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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) [2023-11-12 00:51:41,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:41,153 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2023-11-12 00:51:41,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 00:51:41,153 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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 20 [2023-11-12 00:51:41,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:41,154 INFO L225 Difference]: With dead ends: 53 [2023-11-12 00:51:41,155 INFO L226 Difference]: Without dead ends: 37 [2023-11-12 00:51:41,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2023-11-12 00:51:41,156 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:41,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:51:41,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-12 00:51:41,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-11-12 00:51:41,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:41,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2023-11-12 00:51:41,169 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 20 [2023-11-12 00:51:41,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:41,169 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2023-11-12 00:51:41,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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) [2023-11-12 00:51:41,169 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2023-11-12 00:51:41,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-12 00:51:41,170 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:41,171 INFO L195 NwaCegarLoop]: trace histogram [24, 4, 4, 1, 1, 1, 1] [2023-11-12 00:51:41,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:51:41,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:51:41,376 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:51:41,377 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:41,377 INFO L85 PathProgramCache]: Analyzing trace with hash 500624441, now seen corresponding path program 3 times [2023-11-12 00:51:41,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:41,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641244524] [2023-11-12 00:51:41,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:41,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:41,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:41,653 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2023-11-12 00:51:41,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:41,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641244524] [2023-11-12 00:51:41,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641244524] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:51:41,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915249462] [2023-11-12 00:51:41,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:51:41,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:51:41,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:51:41,656 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:51:41,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:51:41,738 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:51:41,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:51:41,740 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-12 00:51:41,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:51:41,971 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-11-12 00:51:41,972 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:51:42,427 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 10 proven. 314 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2023-11-12 00:51:42,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915249462] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:51:42,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [525922024] [2023-11-12 00:51:42,430 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-12 00:51:42,430 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:51:42,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:51:42,431 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:51:42,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:51:42,731 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:51:42,930 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '766#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:51:42,930 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:51:42,930 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:51:42,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11] total 29 [2023-11-12 00:51:42,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393553523] [2023-11-12 00:51:42,931 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:51:42,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-12 00:51:42,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:42,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-12 00:51:42,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2023-11-12 00:51:42,934 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 29 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 29 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:54,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:54,053 INFO L93 Difference]: Finished difference Result 135 states and 176 transitions. [2023-11-12 00:51:54,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2023-11-12 00:51:54,053 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 29 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2023-11-12 00:51:54,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:54,056 INFO L225 Difference]: With dead ends: 135 [2023-11-12 00:51:54,056 INFO L226 Difference]: Without dead ends: 107 [2023-11-12 00:51:54,063 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5253 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=2638, Invalid=11168, Unknown=0, NotChecked=0, Total=13806 [2023-11-12 00:51:54,064 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 70 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 619 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:54,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 32 Invalid, 646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 619 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-12 00:51:54,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-11-12 00:51:54,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2023-11-12 00:51:54,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.2169811320754718) internal successors, (129), 106 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:54,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 129 transitions. [2023-11-12 00:51:54,098 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 129 transitions. Word has length 36 [2023-11-12 00:51:54,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:54,098 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 129 transitions. [2023-11-12 00:51:54,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 29 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:54,099 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 129 transitions. [2023-11-12 00:51:54,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-11-12 00:51:54,102 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:54,103 INFO L195 NwaCegarLoop]: trace histogram [70, 10, 10, 1, 1, 1, 1] [2023-11-12 00:51:54,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:51:54,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:51:54,309 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:51:54,310 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:54,310 INFO L85 PathProgramCache]: Analyzing trace with hash 198990345, now seen corresponding path program 4 times [2023-11-12 00:51:54,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:54,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606974191] [2023-11-12 00:51:54,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:54,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:54,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:54,835 INFO L134 CoverageAnalysis]: Checked inductivity of 3215 backedges. 586 proven. 28 refuted. 0 times theorem prover too weak. 2601 trivial. 0 not checked. [2023-11-12 00:51:54,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:54,836 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606974191] [2023-11-12 00:51:54,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606974191] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:51:54,836 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162681780] [2023-11-12 00:51:54,837 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:51:54,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:51:54,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:51:54,839 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:51:54,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:51:54,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:54,974 INFO L262 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-12 00:51:54,978 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:51:55,320 INFO L134 CoverageAnalysis]: Checked inductivity of 3215 backedges. 0 proven. 2935 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2023-11-12 00:51:55,321 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:51:55,605 INFO L134 CoverageAnalysis]: Checked inductivity of 3215 backedges. 0 proven. 1630 refuted. 0 times theorem prover too weak. 1585 trivial. 0 not checked. [2023-11-12 00:51:55,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162681780] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:51:55,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [742244086] [2023-11-12 00:51:55,607 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-12 00:51:55,607 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:51:55,607 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:51:55,608 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:51:55,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:51:55,852 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:51:56,030 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1997#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:51:56,030 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:51:56,030 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:51:56,030 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 4] total 25 [2023-11-12 00:51:56,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267927370] [2023-11-12 00:51:56,030 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:51:56,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-12 00:51:56,031 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:51:56,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-12 00:51:56,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=680, Unknown=0, NotChecked=0, Total=756 [2023-11-12 00:51:56,033 INFO L87 Difference]: Start difference. First operand 107 states and 129 transitions. Second operand has 25 states, 25 states have (on average 2.32) internal successors, (58), 25 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:58,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:51:58,910 INFO L93 Difference]: Finished difference Result 436 states and 566 transitions. [2023-11-12 00:51:58,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2023-11-12 00:51:58,910 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 25 states have internal predecessors, (58), 0 states have call successors, (0), 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 94 [2023-11-12 00:51:58,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:51:58,913 INFO L225 Difference]: With dead ends: 436 [2023-11-12 00:51:58,913 INFO L226 Difference]: Without dead ends: 338 [2023-11-12 00:51:58,920 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 265 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5654 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=932, Invalid=16624, Unknown=0, NotChecked=0, Total=17556 [2023-11-12 00:51:58,921 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 14 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 1605 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 1608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1605 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-12 00:51:58,921 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 27 Invalid, 1608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 1605 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-12 00:51:58,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2023-11-12 00:51:58,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 123. [2023-11-12 00:51:58,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.1639344262295082) internal successors, (142), 122 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:58,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 142 transitions. [2023-11-12 00:51:58,967 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 142 transitions. Word has length 94 [2023-11-12 00:51:58,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:51:58,968 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 142 transitions. [2023-11-12 00:51:58,968 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 25 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:51:58,968 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 142 transitions. [2023-11-12 00:51:58,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-12 00:51:58,970 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:51:58,970 INFO L195 NwaCegarLoop]: trace histogram [88, 11, 11, 1, 1, 1, 1] [2023-11-12 00:51:58,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:51:59,175 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-12 00:51:59,176 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:51:59,176 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:51:59,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1024538781, now seen corresponding path program 5 times [2023-11-12 00:51:59,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:51:59,176 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493933050] [2023-11-12 00:51:59,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:51:59,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:51:59,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:51:59,656 INFO L134 CoverageAnalysis]: Checked inductivity of 4917 backedges. 821 proven. 36 refuted. 0 times theorem prover too weak. 4060 trivial. 0 not checked. [2023-11-12 00:51:59,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:51:59,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493933050] [2023-11-12 00:51:59,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493933050] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:51:59,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676878400] [2023-11-12 00:51:59,657 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:51:59,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:51:59,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:51:59,661 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:51:59,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:51:59,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-11-12 00:51:59,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:51:59,858 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-12 00:51:59,862 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:51:59,898 INFO L134 CoverageAnalysis]: Checked inductivity of 4917 backedges. 821 proven. 36 refuted. 0 times theorem prover too weak. 4060 trivial. 0 not checked. [2023-11-12 00:51:59,898 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:52:00,069 INFO L134 CoverageAnalysis]: Checked inductivity of 4917 backedges. 821 proven. 36 refuted. 0 times theorem prover too weak. 4060 trivial. 0 not checked. [2023-11-12 00:52:00,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676878400] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:52:00,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1708763278] [2023-11-12 00:52:00,072 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-12 00:52:00,072 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:52:00,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:52:00,073 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:52:00,073 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:52:00,306 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:52:00,464 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4016#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:52:00,464 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:52:00,464 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:52:00,465 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2023-11-12 00:52:00,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999131386] [2023-11-12 00:52:00,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:52:00,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-12 00:52:00,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:52:00,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-12 00:52:00,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2023-11-12 00:52:00,467 INFO L87 Difference]: Start difference. First operand 123 states and 142 transitions. Second operand has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:52:00,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:52:00,601 INFO L93 Difference]: Finished difference Result 249 states and 300 transitions. [2023-11-12 00:52:00,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-12 00:52:00,602 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2023-11-12 00:52:00,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:52:00,603 INFO L225 Difference]: With dead ends: 249 [2023-11-12 00:52:00,603 INFO L226 Difference]: Without dead ends: 137 [2023-11-12 00:52:00,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2023-11-12 00:52:00,605 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:52:00,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:52:00,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2023-11-12 00:52:00,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2023-11-12 00:52:00,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.088235294117647) internal successors, (148), 136 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:52:00,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 148 transitions. [2023-11-12 00:52:00,687 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 148 transitions. Word has length 114 [2023-11-12 00:52:00,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:52:00,688 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 148 transitions. [2023-11-12 00:52:00,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:52:00,689 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 148 transitions. [2023-11-12 00:52:00,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-11-12 00:52:00,701 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:52:00,701 INFO L195 NwaCegarLoop]: trace histogram [110, 11, 11, 1, 1, 1, 1] [2023-11-12 00:52:00,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:52:00,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:52:00,908 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:52:00,909 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:52:00,909 INFO L85 PathProgramCache]: Analyzing trace with hash 17179741, now seen corresponding path program 6 times [2023-11-12 00:52:00,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:52:00,909 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545816470] [2023-11-12 00:52:00,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:52:00,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:52:01,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:52:01,733 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 0 proven. 6721 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2023-11-12 00:52:01,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:52:01,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545816470] [2023-11-12 00:52:01,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545816470] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:52:01,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150961199] [2023-11-12 00:52:01,734 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:52:01,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:52:01,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:52:01,736 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:52:01,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:52:01,904 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:52:01,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:52:01,907 INFO L262 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-12 00:52:01,912 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:52:02,118 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 0 proven. 6721 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2023-11-12 00:52:02,118 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:52:02,691 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 0 proven. 6721 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2023-11-12 00:52:02,692 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150961199] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:52:02,692 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [799514853] [2023-11-12 00:52:02,694 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-12 00:52:02,695 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:52:02,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:52:02,698 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:52:02,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:52:02,912 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:52:03,097 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5617#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:52:03,097 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:52:03,097 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:52:03,097 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2023-11-12 00:52:03,097 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897580594] [2023-11-12 00:52:03,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:52:03,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-12 00:52:03,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:52:03,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-12 00:52:03,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=642, Unknown=0, NotChecked=0, Total=870 [2023-11-12 00:52:03,099 INFO L87 Difference]: Start difference. First operand 137 states and 148 transitions. Second operand has 27 states, 27 states have (on average 2.740740740740741) internal successors, (74), 26 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:52:18,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:52:18,086 INFO L93 Difference]: Finished difference Result 626 states and 691 transitions. [2023-11-12 00:52:18,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-12 00:52:18,087 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.740740740740741) internal successors, (74), 26 states have internal predecessors, (74), 0 states have call successors, (0), 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 136 [2023-11-12 00:52:18,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:52:18,092 INFO L225 Difference]: With dead ends: 626 [2023-11-12 00:52:18,092 INFO L226 Difference]: Without dead ends: 623 [2023-11-12 00:52:18,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 391 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=525, Invalid=1115, Unknown=0, NotChecked=0, Total=1640 [2023-11-12 00:52:18,093 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 30 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:52:18,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 182 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:52:18,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2023-11-12 00:52:18,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 305. [2023-11-12 00:52:18,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 1.0855263157894737) internal successors, (330), 304 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:52:18,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 330 transitions. [2023-11-12 00:52:18,226 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 330 transitions. Word has length 136 [2023-11-12 00:52:18,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:52:18,226 INFO L495 AbstractCegarLoop]: Abstraction has 305 states and 330 transitions. [2023-11-12 00:52:18,227 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.740740740740741) internal successors, (74), 26 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:52:18,227 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 330 transitions. [2023-11-12 00:52:18,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2023-11-12 00:52:18,232 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:52:18,232 INFO L195 NwaCegarLoop]: trace histogram [250, 25, 25, 1, 1, 1, 1] [2023-11-12 00:52:18,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:52:18,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:52:18,435 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:52:18,436 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:52:18,436 INFO L85 PathProgramCache]: Analyzing trace with hash 669174437, now seen corresponding path program 7 times [2023-11-12 00:52:18,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:52:18,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406716862] [2023-11-12 00:52:18,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:52:18,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:52:18,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:52:21,312 INFO L134 CoverageAnalysis]: Checked inductivity of 38000 backedges. 0 proven. 36625 refuted. 0 times theorem prover too weak. 1375 trivial. 0 not checked. [2023-11-12 00:52:21,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:52:21,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406716862] [2023-11-12 00:52:21,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406716862] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:52:21,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657065373] [2023-11-12 00:52:21,313 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:52:21,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:52:21,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:52:21,317 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:52:21,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ccfd994a-f414-4e15-a9f9-bbaa8ff3e6f2/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:52:21,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:52:21,696 INFO L262 TraceCheckSpWp]: Trace formula consists of 933 conjuncts, 53 conjunts are in the unsatisfiable core [2023-11-12 00:52:21,704 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:52:22,149 INFO L134 CoverageAnalysis]: Checked inductivity of 38000 backedges. 0 proven. 36625 refuted. 0 times theorem prover too weak. 1375 trivial. 0 not checked. [2023-11-12 00:52:22,151 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:52:24,459 INFO L134 CoverageAnalysis]: Checked inductivity of 38000 backedges. 0 proven. 36625 refuted. 0 times theorem prover too weak. 1375 trivial. 0 not checked. [2023-11-12 00:52:24,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657065373] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:52:24,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1117092172] [2023-11-12 00:52:24,471 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-12 00:52:24,471 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:52:24,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:52:24,472 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:52:24,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:52:24,679 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:52:25,038 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9366#(and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) 0)) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:52:25,039 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:52:25,039 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:52:25,039 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 54 [2023-11-12 00:52:25,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923936704] [2023-11-12 00:52:25,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:52:25,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2023-11-12 00:52:25,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:52:25,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2023-11-12 00:52:25,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=844, Invalid=2462, Unknown=0, NotChecked=0, Total=3306 [2023-11-12 00:52:25,044 INFO L87 Difference]: Start difference. First operand 305 states and 330 transitions. Second operand has 55 states, 55 states have (on average 2.8727272727272726) internal successors, (158), 54 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)