./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a0165632 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_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje --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 bd654f01b412711828f8177df5f8f7c2933e3d7436939e6c61fdcced19c9515c --- Real Ultimate output --- This is Ultimate 0.2.5-dev-a016563 [2024-11-09 07:24:22,205 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-09 07:24:22,282 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-09 07:24:22,285 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-09 07:24:22,286 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-09 07:24:22,306 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-09 07:24:22,307 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-09 07:24:22,307 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-09 07:24:22,308 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-09 07:24:22,309 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-09 07:24:22,309 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-09 07:24:22,310 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-09 07:24:22,310 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-09 07:24:22,310 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-09 07:24:22,311 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-09 07:24:22,311 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-09 07:24:22,312 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-09 07:24:22,312 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-09 07:24:22,313 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-09 07:24:22,313 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-09 07:24:22,313 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-09 07:24:22,314 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-09 07:24:22,315 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-09 07:24:22,315 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-09 07:24:22,315 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-09 07:24:22,316 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-09 07:24:22,316 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-09 07:24:22,317 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-09 07:24:22,317 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-09 07:24:22,321 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-09 07:24:22,321 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-09 07:24:22,322 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-09 07:24:22,322 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-09 07:24:22,322 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-09 07:24:22,322 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-09 07:24:22,323 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-09 07:24:22,323 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-09 07:24:22,323 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-09 07:24:22,324 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 07:24:22,324 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-09 07:24:22,324 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-09 07:24:22,325 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-09 07:24:22,325 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-09 07:24:22,326 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-09 07:24:22,326 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-09 07:24:22,326 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-09 07:24:22,327 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-09 07:24:22,327 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_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bd654f01b412711828f8177df5f8f7c2933e3d7436939e6c61fdcced19c9515c [2024-11-09 07:24:22,600 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-09 07:24:22,631 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-09 07:24:22,634 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-09 07:24:22,636 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-09 07:24:22,637 INFO L274 PluginConnector]: CDTParser initialized [2024-11-09 07:24:22,638 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/../../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c Unable to find full path for "g++" [2024-11-09 07:24:24,663 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-09 07:24:24,834 INFO L384 CDTParser]: Found 1 translation units. [2024-11-09 07:24:24,835 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c [2024-11-09 07:24:24,842 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/data/5c1f75041/fedd681e775d4748a147b2b3e0ba324a/FLAG8fdeccfa4 [2024-11-09 07:24:25,230 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/data/5c1f75041/fedd681e775d4748a147b2b3e0ba324a [2024-11-09 07:24:25,233 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-09 07:24:25,234 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-09 07:24:25,235 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-09 07:24:25,235 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-09 07:24:25,241 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-09 07:24:25,241 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,242 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a652dc1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25, skipping insertion in model container [2024-11-09 07:24:25,243 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,263 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-09 07:24:25,431 WARN L250 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_063a3e4d-896a-4395-8546-0b52e4ea6189/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c[408,421] [2024-11-09 07:24:25,456 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 07:24:25,464 INFO L200 MainTranslator]: Completed pre-run [2024-11-09 07:24:25,477 WARN L250 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_063a3e4d-896a-4395-8546-0b52e4ea6189/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c[408,421] [2024-11-09 07:24:25,486 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 07:24:25,503 INFO L204 MainTranslator]: Completed translation [2024-11-09 07:24:25,504 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25 WrapperNode [2024-11-09 07:24:25,504 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-09 07:24:25,505 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-09 07:24:25,505 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-09 07:24:25,505 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-09 07:24:25,513 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,520 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,540 INFO L138 Inliner]: procedures = 16, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 98 [2024-11-09 07:24:25,540 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-09 07:24:25,541 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-09 07:24:25,541 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-09 07:24:25,541 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-09 07:24:25,550 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,550 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,552 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,553 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,558 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,563 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,564 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,565 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,567 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-09 07:24:25,568 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-09 07:24:25,568 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-09 07:24:25,568 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-09 07:24:25,569 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (1/1) ... [2024-11-09 07:24:25,575 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 07:24:25,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:25,604 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-09 07:24:25,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-09 07:24:25,642 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-09 07:24:25,642 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-09 07:24:25,642 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-09 07:24:25,642 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2024-11-09 07:24:25,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-09 07:24:25,643 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-09 07:24:25,643 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2024-11-09 07:24:25,715 INFO L238 CfgBuilder]: Building ICFG [2024-11-09 07:24:25,717 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-09 07:24:25,935 INFO L? ?]: Removed 20 outVars from TransFormulas that were not future-live. [2024-11-09 07:24:25,936 INFO L287 CfgBuilder]: Performing block encoding [2024-11-09 07:24:25,960 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-09 07:24:25,960 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-09 07:24:25,961 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 07:24:25 BoogieIcfgContainer [2024-11-09 07:24:25,961 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-09 07:24:25,963 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-09 07:24:25,964 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-09 07:24:25,967 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-09 07:24:25,967 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 07:24:25" (1/3) ... [2024-11-09 07:24:25,967 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10d53b5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 07:24:25, skipping insertion in model container [2024-11-09 07:24:25,968 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 07:24:25" (2/3) ... [2024-11-09 07:24:25,968 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10d53b5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 07:24:25, skipping insertion in model container [2024-11-09 07:24:25,968 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 07:24:25" (3/3) ... [2024-11-09 07:24:25,969 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m3.c [2024-11-09 07:24:25,985 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-09 07:24:25,985 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-09 07:24:26,034 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-09 07:24:26,040 INFO L333 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, 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;@43e52660, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-09 07:24:26,040 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-09 07:24:26,045 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 28 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:26,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-11-09 07:24:26,053 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:26,053 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:24:26,054 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:26,060 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:26,060 INFO L85 PathProgramCache]: Analyzing trace with hash 1288797282, now seen corresponding path program 1 times [2024-11-09 07:24:26,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:26,071 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815747672] [2024-11-09 07:24:26,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:26,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:26,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:26,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:26,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:26,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815747672] [2024-11-09 07:24:26,361 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815747672] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 07:24:26,361 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 07:24:26,361 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-09 07:24:26,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114669814] [2024-11-09 07:24:26,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 07:24:26,368 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-09 07:24:26,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:26,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-09 07:24:26,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-09 07:24:26,397 INFO L87 Difference]: Start difference. First operand has 29 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 28 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:26,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:26,498 INFO L93 Difference]: Finished difference Result 56 states and 85 transitions. [2024-11-09 07:24:26,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-09 07:24:26,502 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2024-11-09 07:24:26,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:26,509 INFO L225 Difference]: With dead ends: 56 [2024-11-09 07:24:26,510 INFO L226 Difference]: Without dead ends: 28 [2024-11-09 07:24:26,513 INFO L431 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 [2024-11-09 07:24:26,520 INFO L432 NwaCegarLoop]: 39 mSDtfsCounter, 1 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:26,522 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 43 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:24:26,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-09 07:24:26,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2024-11-09 07:24:26,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 27 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) [2024-11-09 07:24:26,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 41 transitions. [2024-11-09 07:24:26,560 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 41 transitions. Word has length 18 [2024-11-09 07:24:26,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:26,561 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 41 transitions. [2024-11-09 07:24:26,562 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:26,562 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 41 transitions. [2024-11-09 07:24:26,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2024-11-09 07:24:26,564 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:26,564 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:24:26,565 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-09 07:24:26,565 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:26,567 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:26,567 INFO L85 PathProgramCache]: Analyzing trace with hash 845702919, now seen corresponding path program 1 times [2024-11-09 07:24:26,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:26,568 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272828628] [2024-11-09 07:24:26,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:26,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:26,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:26,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 07:24:26,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:26,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272828628] [2024-11-09 07:24:26,740 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1272828628] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 07:24:26,740 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 07:24:26,740 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-09 07:24:26,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218858952] [2024-11-09 07:24:26,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 07:24:26,746 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-09 07:24:26,746 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:26,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-09 07:24:26,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-09 07:24:26,747 INFO L87 Difference]: Start difference. First operand 28 states and 41 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:26,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:26,909 INFO L93 Difference]: Finished difference Result 59 states and 93 transitions. [2024-11-09 07:24:26,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-09 07:24:26,910 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2024-11-09 07:24:26,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:26,911 INFO L225 Difference]: With dead ends: 59 [2024-11-09 07:24:26,913 INFO L226 Difference]: Without dead ends: 40 [2024-11-09 07:24:26,913 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-09 07:24:26,915 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 41 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:26,916 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 13 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:24:26,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2024-11-09 07:24:26,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2024-11-09 07:24:26,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.358974358974359) internal successors, (53), 39 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) [2024-11-09 07:24:26,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 53 transitions. [2024-11-09 07:24:26,930 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 53 transitions. Word has length 20 [2024-11-09 07:24:26,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:26,931 INFO L471 AbstractCegarLoop]: Abstraction has 40 states and 53 transitions. [2024-11-09 07:24:26,931 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:26,931 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 53 transitions. [2024-11-09 07:24:26,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-11-09 07:24:26,932 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:26,932 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:24:26,932 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-09 07:24:26,933 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:26,934 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:26,935 INFO L85 PathProgramCache]: Analyzing trace with hash 1718447749, now seen corresponding path program 1 times [2024-11-09 07:24:26,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:26,935 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671036996] [2024-11-09 07:24:26,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:26,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:26,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:27,118 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-09 07:24:27,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:27,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671036996] [2024-11-09 07:24:27,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671036996] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:27,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246565142] [2024-11-09 07:24:27,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:27,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:27,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:27,121 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:27,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-09 07:24:27,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:27,229 INFO L255 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-09 07:24:27,235 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:27,327 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-09 07:24:27,328 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:27,370 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-09 07:24:27,374 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246565142] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:27,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1831585269] [2024-11-09 07:24:27,399 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:24:27,399 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:27,403 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:27,411 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:27,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:29,905 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:30,784 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '279#true' at error location [2024-11-09 07:24:30,786 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:30,786 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:30,786 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2024-11-09 07:24:30,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606239612] [2024-11-09 07:24:30,787 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:30,787 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-09 07:24:30,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:30,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-09 07:24:30,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2024-11-09 07:24:30,791 INFO L87 Difference]: Start difference. First operand 40 states and 53 transitions. Second operand has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:30,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:30,920 INFO L93 Difference]: Finished difference Result 76 states and 102 transitions. [2024-11-09 07:24:30,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-09 07:24:30,922 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2024-11-09 07:24:30,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:30,923 INFO L225 Difference]: With dead ends: 76 [2024-11-09 07:24:30,923 INFO L226 Difference]: Without dead ends: 42 [2024-11-09 07:24:30,924 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2024-11-09 07:24:30,925 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 2 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:30,926 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 32 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:24:30,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2024-11-09 07:24:30,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2024-11-09 07:24:30,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:30,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2024-11-09 07:24:30,933 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 32 [2024-11-09 07:24:30,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:30,934 INFO L471 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2024-11-09 07:24:30,934 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:30,934 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2024-11-09 07:24:30,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-11-09 07:24:30,935 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:30,935 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:24:30,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-11-09 07:24:31,139 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:31,140 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:31,140 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:31,140 INFO L85 PathProgramCache]: Analyzing trace with hash 1192121450, now seen corresponding path program 2 times [2024-11-09 07:24:31,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:31,141 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948829034] [2024-11-09 07:24:31,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:31,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:31,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:31,269 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 07:24:31,269 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:31,269 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948829034] [2024-11-09 07:24:31,270 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [948829034] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:31,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018218286] [2024-11-09 07:24:31,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:24:31,270 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:31,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:31,272 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:31,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-09 07:24:31,342 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-09 07:24:31,342 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:24:31,343 INFO L255 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-09 07:24:31,345 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:31,395 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 07:24:31,396 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:31,427 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 07:24:31,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2018218286] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:31,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1572429760] [2024-11-09 07:24:31,433 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:24:31,433 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:31,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:31,434 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:31,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:33,045 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:33,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '640#true' at error location [2024-11-09 07:24:33,700 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:33,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:33,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2024-11-09 07:24:33,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115479650] [2024-11-09 07:24:33,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:33,702 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-09 07:24:33,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:33,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-09 07:24:33,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2024-11-09 07:24:33,704 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 8 states, 8 states have (on average 4.875) internal successors, (39), 8 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:33,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:33,855 INFO L93 Difference]: Finished difference Result 78 states and 94 transitions. [2024-11-09 07:24:33,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-09 07:24:33,856 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 8 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2024-11-09 07:24:33,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:33,857 INFO L225 Difference]: With dead ends: 78 [2024-11-09 07:24:33,857 INFO L226 Difference]: Without dead ends: 54 [2024-11-09 07:24:33,857 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 77 SyntacticMatches, 7 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2024-11-09 07:24:33,858 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 74 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:33,859 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 13 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 07:24:33,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2024-11-09 07:24:33,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 47. [2024-11-09 07:24:33,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 46 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) [2024-11-09 07:24:33,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2024-11-09 07:24:33,867 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 34 [2024-11-09 07:24:33,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:33,867 INFO L471 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2024-11-09 07:24:33,868 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 8 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:33,868 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2024-11-09 07:24:33,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-11-09 07:24:33,869 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:33,869 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:24:33,889 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-09 07:24:34,073 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:34,074 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:34,074 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:34,075 INFO L85 PathProgramCache]: Analyzing trace with hash 1640408936, now seen corresponding path program 3 times [2024-11-09 07:24:34,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:34,075 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466938554] [2024-11-09 07:24:34,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:34,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:34,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:36,959 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:36,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:36,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466938554] [2024-11-09 07:24:36,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466938554] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:36,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841060131] [2024-11-09 07:24:36,960 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:24:36,960 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:36,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:36,963 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:36,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-09 07:24:37,059 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:24:37,060 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:24:37,061 INFO L255 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 58 conjuncts are in the unsatisfiable core [2024-11-09 07:24:37,066 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:37,901 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 07:24:37,901 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:38,769 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 07:24:38,770 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 43 [2024-11-09 07:24:38,887 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 07:24:38,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841060131] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:38,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [29745914] [2024-11-09 07:24:38,892 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:24:38,893 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:38,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:38,893 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:38,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:40,261 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:41,716 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1040#true' at error location [2024-11-09 07:24:41,716 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:41,717 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:41,717 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 19] total 49 [2024-11-09 07:24:41,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713185011] [2024-11-09 07:24:41,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:41,718 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2024-11-09 07:24:41,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:41,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2024-11-09 07:24:41,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=3766, Unknown=0, NotChecked=0, Total=4032 [2024-11-09 07:24:41,721 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 49 states, 49 states have (on average 2.5714285714285716) internal successors, (126), 49 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:43,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:43,042 INFO L93 Difference]: Finished difference Result 90 states and 101 transitions. [2024-11-09 07:24:43,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-09 07:24:43,042 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.5714285714285716) internal successors, (126), 49 states have internal predecessors, (126), 0 states have call successors, (0), 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 46 [2024-11-09 07:24:43,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:43,044 INFO L225 Difference]: With dead ends: 90 [2024-11-09 07:24:43,045 INFO L226 Difference]: Without dead ends: 86 [2024-11-09 07:24:43,047 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 94 SyntacticMatches, 4 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1256 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=302, Invalid=4528, Unknown=0, NotChecked=0, Total=4830 [2024-11-09 07:24:43,049 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 16 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 1581 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 1583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:43,051 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 235 Invalid, 1583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1581 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-09 07:24:43,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2024-11-09 07:24:43,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 76. [2024-11-09 07:24:43,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.16) internal successors, (87), 75 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:43,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 87 transitions. [2024-11-09 07:24:43,072 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 87 transitions. Word has length 46 [2024-11-09 07:24:43,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:43,074 INFO L471 AbstractCegarLoop]: Abstraction has 76 states and 87 transitions. [2024-11-09 07:24:43,074 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.5714285714285716) internal successors, (126), 49 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:43,074 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 87 transitions. [2024-11-09 07:24:43,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2024-11-09 07:24:43,075 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:43,076 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:24:43,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-09 07:24:43,279 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:43,280 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:43,280 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:43,280 INFO L85 PathProgramCache]: Analyzing trace with hash -742764819, now seen corresponding path program 4 times [2024-11-09 07:24:43,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:43,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79988684] [2024-11-09 07:24:43,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:43,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:43,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:43,419 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2024-11-09 07:24:43,420 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:43,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79988684] [2024-11-09 07:24:43,420 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [79988684] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:43,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227099331] [2024-11-09 07:24:43,420 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:24:43,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:43,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:43,422 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:43,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-09 07:24:43,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:43,496 INFO L255 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-09 07:24:43,498 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:43,572 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2024-11-09 07:24:43,573 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:43,628 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2024-11-09 07:24:43,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227099331] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:43,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [998483751] [2024-11-09 07:24:43,631 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:24:43,632 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:43,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:43,632 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:43,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:44,842 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:45,508 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1624#true' at error location [2024-11-09 07:24:45,508 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:45,509 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:45,509 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2024-11-09 07:24:45,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773229669] [2024-11-09 07:24:45,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:45,511 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-09 07:24:45,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:45,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-09 07:24:45,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=677, Unknown=0, NotChecked=0, Total=812 [2024-11-09 07:24:45,512 INFO L87 Difference]: Start difference. First operand 76 states and 87 transitions. Second operand has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:45,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:45,832 INFO L93 Difference]: Finished difference Result 168 states and 194 transitions. [2024-11-09 07:24:45,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-09 07:24:45,833 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2024-11-09 07:24:45,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:45,834 INFO L225 Difference]: With dead ends: 168 [2024-11-09 07:24:45,834 INFO L226 Difference]: Without dead ends: 96 [2024-11-09 07:24:45,835 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 115 SyntacticMatches, 9 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=156, Invalid=774, Unknown=0, NotChecked=0, Total=930 [2024-11-09 07:24:45,835 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 76 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:45,836 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 37 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:24:45,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2024-11-09 07:24:45,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 83. [2024-11-09 07:24:45,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1341463414634145) internal successors, (93), 82 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:45,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2024-11-09 07:24:45,846 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 48 [2024-11-09 07:24:45,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:45,846 INFO L471 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2024-11-09 07:24:45,846 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:45,846 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2024-11-09 07:24:45,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2024-11-09 07:24:45,847 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:45,848 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:24:45,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-09 07:24:46,048 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2024-11-09 07:24:46,048 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:46,049 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:46,049 INFO L85 PathProgramCache]: Analyzing trace with hash -1880831278, now seen corresponding path program 5 times [2024-11-09 07:24:46,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:46,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83656754] [2024-11-09 07:24:46,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:46,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:46,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:46,194 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 07:24:46,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:46,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83656754] [2024-11-09 07:24:46,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83656754] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:46,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715949235] [2024-11-09 07:24:46,195 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:24:46,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:46,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:46,197 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:46,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-09 07:24:46,278 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 07:24:46,278 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:24:46,279 INFO L255 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-09 07:24:46,281 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:46,385 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 07:24:46,385 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:46,488 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 07:24:46,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715949235] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:46,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1644204821] [2024-11-09 07:24:46,490 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:24:46,490 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:46,491 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:46,491 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:46,491 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:47,587 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:24:48,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2303#true' at error location [2024-11-09 07:24:48,206 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:24:48,206 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:24:48,206 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2024-11-09 07:24:48,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246740240] [2024-11-09 07:24:48,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:24:48,207 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-09 07:24:48,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:24:48,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-09 07:24:48,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2024-11-09 07:24:48,207 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand has 14 states, 14 states have (on average 4.785714285714286) internal successors, (67), 14 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:48,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:24:48,549 INFO L93 Difference]: Finished difference Result 95 states and 105 transitions. [2024-11-09 07:24:48,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-09 07:24:48,552 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.785714285714286) internal successors, (67), 14 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2024-11-09 07:24:48,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:24:48,552 INFO L225 Difference]: With dead ends: 95 [2024-11-09 07:24:48,553 INFO L226 Difference]: Without dead ends: 67 [2024-11-09 07:24:48,553 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 121 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=216, Invalid=906, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 07:24:48,554 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 69 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:24:48,554 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 28 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:24:48,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2024-11-09 07:24:48,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2024-11-09 07:24:48,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:48,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2024-11-09 07:24:48,565 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 50 [2024-11-09 07:24:48,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:24:48,565 INFO L471 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2024-11-09 07:24:48,565 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.785714285714286) internal successors, (67), 14 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:24:48,565 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2024-11-09 07:24:48,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2024-11-09 07:24:48,566 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:24:48,567 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:24:48,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-09 07:24:48,770 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:48,771 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:24:48,771 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:24:48,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1180543221, now seen corresponding path program 6 times [2024-11-09 07:24:48,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:24:48,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391016426] [2024-11-09 07:24:48,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:24:48,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:24:48,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:24:53,783 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:24:53,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:24:53,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391016426] [2024-11-09 07:24:53,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391016426] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:24:53,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593179474] [2024-11-09 07:24:53,784 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:24:53,784 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:24:53,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:24:53,786 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:24:53,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-09 07:24:53,880 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:24:53,881 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:24:53,883 INFO L255 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 79 conjuncts are in the unsatisfiable core [2024-11-09 07:24:53,890 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:24:55,384 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 07:24:55,385 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:24:57,220 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 07:24:57,220 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 89 [2024-11-09 07:24:57,494 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 07:24:57,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593179474] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:24:57,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1396589604] [2024-11-09 07:24:57,496 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:24:57,496 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:24:57,497 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:24:57,497 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:24:57,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:24:58,564 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:00,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2861#true' at error location [2024-11-09 07:25:00,660 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:00,660 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:00,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 24, 25] total 77 [2024-11-09 07:25:00,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024656917] [2024-11-09 07:25:00,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:00,660 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2024-11-09 07:25:00,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:00,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2024-11-09 07:25:00,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=379, Invalid=7993, Unknown=0, NotChecked=0, Total=8372 [2024-11-09 07:25:00,663 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 77 states, 77 states have (on average 2.1298701298701297) internal successors, (164), 77 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:09,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:09,964 INFO L93 Difference]: Finished difference Result 167 states and 188 transitions. [2024-11-09 07:25:09,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2024-11-09 07:25:09,964 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 2.1298701298701297) internal successors, (164), 77 states have internal predecessors, (164), 0 states have call successors, (0), 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 60 [2024-11-09 07:25:09,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:09,965 INFO L225 Difference]: With dead ends: 167 [2024-11-09 07:25:09,965 INFO L226 Difference]: Without dead ends: 161 [2024-11-09 07:25:09,970 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 119 SyntacticMatches, 5 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4878 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=1532, Invalid=20818, Unknown=0, NotChecked=0, Total=22350 [2024-11-09 07:25:09,971 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 525 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 4996 mSolverCounterSat, 508 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 525 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 5504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 508 IncrementalHoareTripleChecker+Valid, 4996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:09,971 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [525 Valid, 198 Invalid, 5504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [508 Valid, 4996 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2024-11-09 07:25:09,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2024-11-09 07:25:09,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 82. [2024-11-09 07:25:09,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.123456790123457) internal successors, (91), 81 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:09,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 91 transitions. [2024-11-09 07:25:09,997 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 91 transitions. Word has length 60 [2024-11-09 07:25:09,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:09,998 INFO L471 AbstractCegarLoop]: Abstraction has 82 states and 91 transitions. [2024-11-09 07:25:09,998 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 2.1298701298701297) internal successors, (164), 77 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:09,998 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 91 transitions. [2024-11-09 07:25:09,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2024-11-09 07:25:09,999 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:10,000 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:25:10,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-09 07:25:10,200 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:10,200 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:10,201 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:10,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1587612016, now seen corresponding path program 7 times [2024-11-09 07:25:10,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:10,201 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804219240] [2024-11-09 07:25:10,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:10,201 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:10,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:10,390 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-09 07:25:10,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:10,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804219240] [2024-11-09 07:25:10,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804219240] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:10,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763527146] [2024-11-09 07:25:10,391 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:25:10,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:10,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:10,393 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:10,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-09 07:25:10,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:10,473 INFO L255 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-09 07:25:10,474 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:10,603 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-09 07:25:10,603 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:10,700 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-09 07:25:10,701 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1763527146] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:10,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [543703465] [2024-11-09 07:25:10,703 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:25:10,704 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:10,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:10,706 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:10,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:11,726 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:12,456 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3780#true' at error location [2024-11-09 07:25:12,457 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:12,457 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:12,457 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-09 07:25:12,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630027402] [2024-11-09 07:25:12,457 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:12,457 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 07:25:12,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:12,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 07:25:12,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=834, Unknown=0, NotChecked=0, Total=992 [2024-11-09 07:25:12,459 INFO L87 Difference]: Start difference. First operand 82 states and 91 transitions. Second operand has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:12,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:12,852 INFO L93 Difference]: Finished difference Result 217 states and 244 transitions. [2024-11-09 07:25:12,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-09 07:25:12,853 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2024-11-09 07:25:12,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:12,854 INFO L225 Difference]: With dead ends: 217 [2024-11-09 07:25:12,854 INFO L226 Difference]: Without dead ends: 102 [2024-11-09 07:25:12,856 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 154 SyntacticMatches, 11 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=194, Invalid=996, Unknown=0, NotChecked=0, Total=1190 [2024-11-09 07:25:12,857 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 129 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:12,857 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 31 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:25:12,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2024-11-09 07:25:12,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 89. [2024-11-09 07:25:12,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.1022727272727273) internal successors, (97), 88 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:12,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 97 transitions. [2024-11-09 07:25:12,889 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 97 transitions. Word has length 62 [2024-11-09 07:25:12,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:12,889 INFO L471 AbstractCegarLoop]: Abstraction has 89 states and 97 transitions. [2024-11-09 07:25:12,891 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:12,891 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 97 transitions. [2024-11-09 07:25:12,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2024-11-09 07:25:12,892 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:12,892 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:25:12,915 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-11-09 07:25:13,093 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:13,093 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:13,093 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:13,094 INFO L85 PathProgramCache]: Analyzing trace with hash -2086523041, now seen corresponding path program 8 times [2024-11-09 07:25:13,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:13,094 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180192138] [2024-11-09 07:25:13,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:13,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:13,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:13,280 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-09 07:25:13,281 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:13,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180192138] [2024-11-09 07:25:13,281 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [180192138] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:13,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915925306] [2024-11-09 07:25:13,281 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:25:13,281 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:13,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:13,283 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:13,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-09 07:25:13,374 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-09 07:25:13,374 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:25:13,375 INFO L255 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-09 07:25:13,377 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:13,477 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-09 07:25:13,477 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:13,570 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-09 07:25:13,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915925306] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:13,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [69473825] [2024-11-09 07:25:13,572 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:25:13,572 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:13,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:13,573 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:13,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:14,559 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:15,188 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4630#true' at error location [2024-11-09 07:25:15,188 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:15,189 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:15,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-09 07:25:15,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749823413] [2024-11-09 07:25:15,189 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:15,189 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 07:25:15,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:15,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 07:25:15,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=770, Unknown=0, NotChecked=0, Total=930 [2024-11-09 07:25:15,190 INFO L87 Difference]: Start difference. First operand 89 states and 97 transitions. Second operand has 17 states, 17 states have (on average 4.352941176470588) internal successors, (74), 17 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) [2024-11-09 07:25:15,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:15,549 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2024-11-09 07:25:15,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-09 07:25:15,549 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.352941176470588) internal successors, (74), 17 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 68 [2024-11-09 07:25:15,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:15,550 INFO L225 Difference]: With dead ends: 101 [2024-11-09 07:25:15,550 INFO L226 Difference]: Without dead ends: 81 [2024-11-09 07:25:15,551 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 177 SyntacticMatches, 12 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=277, Invalid=1205, Unknown=0, NotChecked=0, Total=1482 [2024-11-09 07:25:15,552 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 110 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:15,552 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 28 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 07:25:15,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2024-11-09 07:25:15,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 75. [2024-11-09 07:25:15,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:15,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2024-11-09 07:25:15,566 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 68 [2024-11-09 07:25:15,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:15,566 INFO L471 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2024-11-09 07:25:15,566 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.352941176470588) internal successors, (74), 17 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) [2024-11-09 07:25:15,566 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2024-11-09 07:25:15,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2024-11-09 07:25:15,567 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:15,568 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:25:15,588 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-09 07:25:15,771 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:15,772 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:15,772 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:15,772 INFO L85 PathProgramCache]: Analyzing trace with hash -1846432402, now seen corresponding path program 9 times [2024-11-09 07:25:15,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:15,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826527026] [2024-11-09 07:25:15,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:15,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:15,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:22,713 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 7 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:22,713 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:22,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826527026] [2024-11-09 07:25:22,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826527026] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:22,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529954792] [2024-11-09 07:25:22,713 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:25:22,714 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:22,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:22,715 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:22,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-09 07:25:22,822 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:25:22,822 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:25:22,825 INFO L255 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 105 conjuncts are in the unsatisfiable core [2024-11-09 07:25:22,830 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:24,903 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2024-11-09 07:25:24,903 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:27,659 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 07:25:27,659 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 153 [2024-11-09 07:25:28,226 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2024-11-09 07:25:28,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529954792] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:28,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [473994311] [2024-11-09 07:25:28,228 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:25:28,229 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:28,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:28,230 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:28,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:29,183 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:31,418 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5338#true' at error location [2024-11-09 07:25:31,418 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:31,418 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:31,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 30, 31] total 96 [2024-11-09 07:25:31,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853909750] [2024-11-09 07:25:31,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:31,419 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2024-11-09 07:25:31,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:31,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2024-11-09 07:25:31,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=490, Invalid=11720, Unknown=0, NotChecked=0, Total=12210 [2024-11-09 07:25:31,423 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 96 states, 96 states have (on average 2.1041666666666665) internal successors, (202), 96 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:44,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:44,397 INFO L93 Difference]: Finished difference Result 198 states and 219 transitions. [2024-11-09 07:25:44,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2024-11-09 07:25:44,398 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 2.1041666666666665) internal successors, (202), 96 states have internal predecessors, (202), 0 states have call successors, (0), 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 74 [2024-11-09 07:25:44,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:44,399 INFO L225 Difference]: With dead ends: 198 [2024-11-09 07:25:44,399 INFO L226 Difference]: Without dead ends: 192 [2024-11-09 07:25:44,401 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 149 SyntacticMatches, 5 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8387 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=2011, Invalid=30209, Unknown=0, NotChecked=0, Total=32220 [2024-11-09 07:25:44,402 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 638 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 7257 mSolverCounterSat, 654 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 638 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 7911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 654 IncrementalHoareTripleChecker+Valid, 7257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:44,402 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [638 Valid, 232 Invalid, 7911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [654 Valid, 7257 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2024-11-09 07:25:44,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2024-11-09 07:25:44,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 100. [2024-11-09 07:25:44,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.101010101010101) internal successors, (109), 99 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:44,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 109 transitions. [2024-11-09 07:25:44,427 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 109 transitions. Word has length 74 [2024-11-09 07:25:44,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:44,427 INFO L471 AbstractCegarLoop]: Abstraction has 100 states and 109 transitions. [2024-11-09 07:25:44,428 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 2.1041666666666665) internal successors, (202), 96 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:44,428 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 109 transitions. [2024-11-09 07:25:44,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2024-11-09 07:25:44,429 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:44,429 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:25:44,444 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2024-11-09 07:25:44,633 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:44,634 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:44,634 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:44,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1240125491, now seen corresponding path program 10 times [2024-11-09 07:25:44,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:44,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497240952] [2024-11-09 07:25:44,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:44,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:44,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:44,854 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-09 07:25:44,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:44,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497240952] [2024-11-09 07:25:44,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497240952] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:44,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382591736] [2024-11-09 07:25:44,856 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:25:44,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:44,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:44,857 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:44,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-09 07:25:44,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:44,952 INFO L255 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-09 07:25:44,954 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:45,100 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-09 07:25:45,100 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:45,217 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-09 07:25:45,218 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382591736] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:45,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [265331863] [2024-11-09 07:25:45,220 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:25:45,220 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:45,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:45,221 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:45,222 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:46,147 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:46,891 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6455#true' at error location [2024-11-09 07:25:46,891 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:46,891 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:46,891 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-09 07:25:46,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606523346] [2024-11-09 07:25:46,892 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:46,892 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 07:25:46,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:46,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 07:25:46,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1005, Unknown=0, NotChecked=0, Total=1190 [2024-11-09 07:25:46,893 INFO L87 Difference]: Start difference. First operand 100 states and 109 transitions. Second operand has 20 states, 20 states have (on average 3.1) internal successors, (62), 20 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:47,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:47,290 INFO L93 Difference]: Finished difference Result 261 states and 288 transitions. [2024-11-09 07:25:47,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-09 07:25:47,291 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 20 states have internal predecessors, (62), 0 states have call successors, (0), 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 76 [2024-11-09 07:25:47,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:47,292 INFO L225 Difference]: With dead ends: 261 [2024-11-09 07:25:47,292 INFO L226 Difference]: Without dead ends: 120 [2024-11-09 07:25:47,292 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 193 SyntacticMatches, 13 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 571 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=239, Invalid=1243, Unknown=0, NotChecked=0, Total=1482 [2024-11-09 07:25:47,293 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 115 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:47,293 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 43 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:25:47,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2024-11-09 07:25:47,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 107. [2024-11-09 07:25:47,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0849056603773586) internal successors, (115), 106 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:47,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2024-11-09 07:25:47,311 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 76 [2024-11-09 07:25:47,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:47,312 INFO L471 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2024-11-09 07:25:47,312 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 20 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:47,312 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2024-11-09 07:25:47,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2024-11-09 07:25:47,312 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:47,313 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:25:47,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2024-11-09 07:25:47,513 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:47,513 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:47,513 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:47,514 INFO L85 PathProgramCache]: Analyzing trace with hash 1570722498, now seen corresponding path program 11 times [2024-11-09 07:25:47,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:47,514 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94486992] [2024-11-09 07:25:47,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:47,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:47,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:47,725 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2024-11-09 07:25:47,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:47,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94486992] [2024-11-09 07:25:47,726 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94486992] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:47,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836304588] [2024-11-09 07:25:47,726 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:25:47,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:47,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:47,728 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:47,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-09 07:25:47,842 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-09 07:25:47,842 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:25:47,844 INFO L255 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-09 07:25:47,845 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:25:47,995 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2024-11-09 07:25:47,995 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:25:48,122 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2024-11-09 07:25:48,122 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836304588] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:25:48,122 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [236422723] [2024-11-09 07:25:48,124 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:25:48,124 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:25:48,124 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:25:48,125 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:25:48,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:25:48,965 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:25:49,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7487#true' at error location [2024-11-09 07:25:49,599 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:25:49,599 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:25:49,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-09 07:25:49,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396292039] [2024-11-09 07:25:49,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:25:49,600 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 07:25:49,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:25:49,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 07:25:49,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=935, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 07:25:49,601 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 20 states, 20 states have (on average 4.25) internal successors, (85), 20 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:50,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:25:50,051 INFO L93 Difference]: Finished difference Result 119 states and 127 transitions. [2024-11-09 07:25:50,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-09 07:25:50,052 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.25) internal successors, (85), 20 states have internal predecessors, (85), 0 states have call successors, (0), 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 82 [2024-11-09 07:25:50,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:25:50,052 INFO L225 Difference]: With dead ends: 119 [2024-11-09 07:25:50,053 INFO L226 Difference]: Without dead ends: 95 [2024-11-09 07:25:50,053 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 213 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=348, Invalid=1544, Unknown=0, NotChecked=0, Total=1892 [2024-11-09 07:25:50,054 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 102 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 551 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 551 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 07:25:50,054 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 40 Invalid, 658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 551 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 07:25:50,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2024-11-09 07:25:50,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 89. [2024-11-09 07:25:50,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:50,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2024-11-09 07:25:50,071 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 82 [2024-11-09 07:25:50,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:25:50,072 INFO L471 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2024-11-09 07:25:50,072 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.25) internal successors, (85), 20 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:25:50,072 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2024-11-09 07:25:50,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2024-11-09 07:25:50,073 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:25:50,073 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:25:50,088 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2024-11-09 07:25:50,277 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:50,278 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:25:50,278 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:25:50,278 INFO L85 PathProgramCache]: Analyzing trace with hash -1160652143, now seen corresponding path program 12 times [2024-11-09 07:25:50,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:25:50,278 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528451188] [2024-11-09 07:25:50,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:25:50,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:25:50,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:25:59,858 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 6 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:25:59,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:25:59,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528451188] [2024-11-09 07:25:59,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528451188] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:25:59,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402434899] [2024-11-09 07:25:59,859 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:25:59,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:25:59,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:25:59,860 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:25:59,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-09 07:25:59,960 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:25:59,961 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:25:59,964 INFO L255 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 127 conjuncts are in the unsatisfiable core [2024-11-09 07:25:59,968 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:26:03,055 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 07:26:03,056 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:26:07,663 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 07:26:07,664 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 235 [2024-11-09 07:26:09,582 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 07:26:09,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402434899] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:26:09,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [711526118] [2024-11-09 07:26:09,584 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:26:09,584 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:26:09,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:26:09,585 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:26:09,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:26:10,374 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:26:13,336 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8331#true' at error location [2024-11-09 07:26:13,336 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:26:13,336 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:26:13,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 36, 37] total 115 [2024-11-09 07:26:13,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606074894] [2024-11-09 07:26:13,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:26:13,337 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2024-11-09 07:26:13,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:26:13,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2024-11-09 07:26:13,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=568, Invalid=16202, Unknown=0, NotChecked=0, Total=16770 [2024-11-09 07:26:13,340 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand has 115 states, 115 states have (on average 2.0869565217391304) internal successors, (240), 115 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:26:33,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:26:33,351 INFO L93 Difference]: Finished difference Result 280 states and 303 transitions. [2024-11-09 07:26:33,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2024-11-09 07:26:33,352 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 2.0869565217391304) internal successors, (240), 115 states have internal predecessors, (240), 0 states have call successors, (0), 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 88 [2024-11-09 07:26:33,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:26:33,354 INFO L225 Difference]: With dead ends: 280 [2024-11-09 07:26:33,354 INFO L226 Difference]: Without dead ends: 274 [2024-11-09 07:26:33,358 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 179 SyntacticMatches, 5 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10875 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=2685, Invalid=43325, Unknown=0, NotChecked=0, Total=46010 [2024-11-09 07:26:33,358 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 874 mSDsluCounter, 358 mSDsCounter, 0 mSdLazyCounter, 9284 mSolverCounterSat, 826 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 874 SdHoareTripleChecker+Valid, 374 SdHoareTripleChecker+Invalid, 10110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 826 IncrementalHoareTripleChecker+Valid, 9284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:26:33,359 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [874 Valid, 374 Invalid, 10110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [826 Valid, 9284 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2024-11-09 07:26:33,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2024-11-09 07:26:33,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 144. [2024-11-09 07:26:33,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.0909090909090908) internal successors, (156), 143 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:26:33,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 156 transitions. [2024-11-09 07:26:33,409 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 156 transitions. Word has length 88 [2024-11-09 07:26:33,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:26:33,410 INFO L471 AbstractCegarLoop]: Abstraction has 144 states and 156 transitions. [2024-11-09 07:26:33,410 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 2.0869565217391304) internal successors, (240), 115 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:26:33,410 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 156 transitions. [2024-11-09 07:26:33,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2024-11-09 07:26:33,411 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:26:33,411 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:26:33,432 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-11-09 07:26:33,615 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-09 07:26:33,616 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:26:33,616 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:26:33,616 INFO L85 PathProgramCache]: Analyzing trace with hash -109712842, now seen corresponding path program 13 times [2024-11-09 07:26:33,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:26:33,616 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570713094] [2024-11-09 07:26:33,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:26:33,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:26:33,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:33,864 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 27 proven. 34 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2024-11-09 07:26:33,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:26:33,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570713094] [2024-11-09 07:26:33,865 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570713094] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:26:33,865 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137324327] [2024-11-09 07:26:33,865 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:26:33,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:33,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:26:33,867 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:26:33,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-09 07:26:33,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:33,971 INFO L255 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-09 07:26:33,973 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:26:34,144 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2024-11-09 07:26:34,144 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:26:34,280 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2024-11-09 07:26:34,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137324327] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:26:34,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1380092826] [2024-11-09 07:26:34,282 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:26:34,282 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:26:34,282 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:26:34,283 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:26:34,283 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:26:35,225 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:26:35,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9771#true' at error location [2024-11-09 07:26:35,988 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:26:35,989 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:26:35,989 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2024-11-09 07:26:35,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794933860] [2024-11-09 07:26:35,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:26:35,989 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-09 07:26:35,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:26:35,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-09 07:26:35,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=1190, Unknown=0, NotChecked=0, Total=1406 [2024-11-09 07:26:35,990 INFO L87 Difference]: Start difference. First operand 144 states and 156 transitions. Second operand has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 23 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:26:36,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:26:36,495 INFO L93 Difference]: Finished difference Result 317 states and 345 transitions. [2024-11-09 07:26:36,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-11-09 07:26:36,496 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 23 states have internal predecessors, (68), 0 states have call successors, (0), 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 90 [2024-11-09 07:26:36,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:26:36,497 INFO L225 Difference]: With dead ends: 317 [2024-11-09 07:26:36,497 INFO L226 Difference]: Without dead ends: 138 [2024-11-09 07:26:36,498 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 232 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=291, Invalid=1515, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 07:26:36,498 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 209 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 227 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:26:36,498 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [209 Valid, 28 Invalid, 745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [227 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:26:36,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2024-11-09 07:26:36,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 125. [2024-11-09 07:26:36,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.0725806451612903) internal successors, (133), 124 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:26:36,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 133 transitions. [2024-11-09 07:26:36,533 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 133 transitions. Word has length 90 [2024-11-09 07:26:36,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:26:36,533 INFO L471 AbstractCegarLoop]: Abstraction has 125 states and 133 transitions. [2024-11-09 07:26:36,533 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 23 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:26:36,533 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 133 transitions. [2024-11-09 07:26:36,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2024-11-09 07:26:36,534 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:26:36,535 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:26:36,555 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-09 07:26:36,735 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-09 07:26:36,735 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:26:36,736 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:26:36,736 INFO L85 PathProgramCache]: Analyzing trace with hash -1198093083, now seen corresponding path program 14 times [2024-11-09 07:26:36,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:26:36,736 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646833671] [2024-11-09 07:26:36,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:26:36,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:26:36,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:36,975 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2024-11-09 07:26:36,975 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:26:36,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646833671] [2024-11-09 07:26:36,975 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646833671] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:26:36,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181690518] [2024-11-09 07:26:36,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:26:36,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:36,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:26:36,977 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:26:36,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-09 07:26:37,118 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-09 07:26:37,119 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:26:37,121 INFO L255 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-09 07:26:37,123 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:26:37,279 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2024-11-09 07:26:37,279 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:26:37,429 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2024-11-09 07:26:37,429 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181690518] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:26:37,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1410742742] [2024-11-09 07:26:37,431 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:26:37,431 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:26:37,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:26:37,431 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:26:37,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:26:38,268 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:26:38,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11003#true' at error location [2024-11-09 07:26:38,961 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:26:38,961 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:26:38,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2024-11-09 07:26:38,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882596356] [2024-11-09 07:26:38,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:26:38,962 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-09 07:26:38,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:26:38,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-09 07:26:38,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1114, Unknown=0, NotChecked=0, Total=1332 [2024-11-09 07:26:38,963 INFO L87 Difference]: Start difference. First operand 125 states and 133 transitions. Second operand has 23 states, 23 states have (on average 4.478260869565218) internal successors, (103), 23 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:26:39,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:26:39,549 INFO L93 Difference]: Finished difference Result 137 states and 145 transitions. [2024-11-09 07:26:39,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-09 07:26:39,549 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 4.478260869565218) internal successors, (103), 23 states have internal predecessors, (103), 0 states have call successors, (0), 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 96 [2024-11-09 07:26:39,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:26:39,550 INFO L225 Difference]: With dead ends: 137 [2024-11-09 07:26:39,550 INFO L226 Difference]: Without dead ends: 109 [2024-11-09 07:26:39,551 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 257 SyntacticMatches, 16 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 916 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=429, Invalid=1923, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 07:26:39,551 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 125 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 822 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:26:39,552 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 34 Invalid, 822 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 687 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:26:39,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2024-11-09 07:26:39,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 103. [2024-11-09 07:26:39,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 102 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:26:39,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 109 transitions. [2024-11-09 07:26:39,573 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 109 transitions. Word has length 96 [2024-11-09 07:26:39,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:26:39,573 INFO L471 AbstractCegarLoop]: Abstraction has 103 states and 109 transitions. [2024-11-09 07:26:39,573 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 4.478260869565218) internal successors, (103), 23 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:26:39,574 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 109 transitions. [2024-11-09 07:26:39,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2024-11-09 07:26:39,575 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:26:39,575 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:26:39,595 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2024-11-09 07:26:39,778 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-09 07:26:39,779 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:26:39,779 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:26:39,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1938558580, now seen corresponding path program 15 times [2024-11-09 07:26:39,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:26:39,779 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392196614] [2024-11-09 07:26:39,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:26:39,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:26:39,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:26:49,076 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 6 proven. 246 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:26:49,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:26:49,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392196614] [2024-11-09 07:26:49,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392196614] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:26:49,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177114244] [2024-11-09 07:26:49,077 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:26:49,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:26:49,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:26:49,078 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:26:49,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-09 07:26:49,193 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:26:49,193 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:26:49,202 INFO L255 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 151 conjuncts are in the unsatisfiable core [2024-11-09 07:26:49,206 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:26:53,821 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-09 07:26:53,821 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:27:01,016 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 07:27:01,017 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 335 [2024-11-09 07:27:02,697 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-09 07:27:02,698 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177114244] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:27:02,698 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1064507884] [2024-11-09 07:27:02,699 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:27:02,700 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:27:02,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:27:02,700 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:27:02,700 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:27:03,595 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:27:07,141 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11991#true' at error location [2024-11-09 07:27:07,141 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:27:07,141 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:27:07,141 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 42, 43] total 134 [2024-11-09 07:27:07,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464739389] [2024-11-09 07:27:07,142 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:27:07,142 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2024-11-09 07:27:07,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:27:07,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2024-11-09 07:27:07,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=21411, Unknown=0, NotChecked=0, Total=22052 [2024-11-09 07:27:07,145 INFO L87 Difference]: Start difference. First operand 103 states and 109 transitions. Second operand has 134 states, 134 states have (on average 2.074626865671642) internal successors, (278), 134 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:27:33,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:27:33,773 INFO L93 Difference]: Finished difference Result 258 states and 279 transitions. [2024-11-09 07:27:33,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2024-11-09 07:27:33,774 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 134 states have (on average 2.074626865671642) internal successors, (278), 134 states have internal predecessors, (278), 0 states have call successors, (0), 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 102 [2024-11-09 07:27:33,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:27:33,775 INFO L225 Difference]: With dead ends: 258 [2024-11-09 07:27:33,775 INFO L226 Difference]: Without dead ends: 252 [2024-11-09 07:27:33,778 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 209 SyntacticMatches, 5 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12223 ImplicationChecksByTransitivity, 34.0s TimeCoverageRelationStatistics Valid=2773, Invalid=53159, Unknown=0, NotChecked=0, Total=55932 [2024-11-09 07:27:33,778 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 945 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 12592 mSolverCounterSat, 890 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 945 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 13482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 890 IncrementalHoareTripleChecker+Valid, 12592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2024-11-09 07:27:33,778 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [945 Valid, 261 Invalid, 13482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [890 Valid, 12592 Invalid, 0 Unknown, 0 Unchecked, 9.2s Time] [2024-11-09 07:27:33,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2024-11-09 07:27:33,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 136. [2024-11-09 07:27:33,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0740740740740742) internal successors, (145), 135 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:27:33,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 145 transitions. [2024-11-09 07:27:33,819 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 145 transitions. Word has length 102 [2024-11-09 07:27:33,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:27:33,819 INFO L471 AbstractCegarLoop]: Abstraction has 136 states and 145 transitions. [2024-11-09 07:27:33,819 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 134 states have (on average 2.074626865671642) internal successors, (278), 134 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:27:33,820 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 145 transitions. [2024-11-09 07:27:33,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2024-11-09 07:27:33,820 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:27:33,820 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:27:33,836 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2024-11-09 07:27:34,021 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-09 07:27:34,021 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:27:34,021 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:27:34,022 INFO L85 PathProgramCache]: Analyzing trace with hash -207214663, now seen corresponding path program 16 times [2024-11-09 07:27:34,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:27:34,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257247042] [2024-11-09 07:27:34,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:27:34,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:27:34,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:27:34,329 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 38 proven. 47 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-09 07:27:34,329 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:27:34,329 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257247042] [2024-11-09 07:27:34,329 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257247042] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:27:34,329 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646750338] [2024-11-09 07:27:34,329 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:27:34,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:34,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:27:34,331 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:27:34,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-09 07:27:34,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:27:34,438 INFO L255 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-09 07:27:34,439 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:27:34,629 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-09 07:27:34,629 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:27:34,782 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-09 07:27:34,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646750338] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:27:34,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080513462] [2024-11-09 07:27:34,785 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:27:34,785 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:27:34,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:27:34,785 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:27:34,786 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:27:35,568 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:27:36,381 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13496#true' at error location [2024-11-09 07:27:36,381 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:27:36,381 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:27:36,381 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2024-11-09 07:27:36,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037095565] [2024-11-09 07:27:36,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:27:36,382 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-09 07:27:36,382 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:27:36,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-09 07:27:36,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1389, Unknown=0, NotChecked=0, Total=1640 [2024-11-09 07:27:36,383 INFO L87 Difference]: Start difference. First operand 136 states and 145 transitions. Second operand has 26 states, 26 states have (on average 2.8461538461538463) 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) [2024-11-09 07:27:36,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:27:36,978 INFO L93 Difference]: Finished difference Result 349 states and 376 transitions. [2024-11-09 07:27:36,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-09 07:27:36,979 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.8461538461538463) 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 104 [2024-11-09 07:27:36,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:27:36,980 INFO L225 Difference]: With dead ends: 349 [2024-11-09 07:27:36,980 INFO L226 Difference]: Without dead ends: 156 [2024-11-09 07:27:36,980 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 271 SyntacticMatches, 17 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 880 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=350, Invalid=1812, Unknown=0, NotChecked=0, Total=2162 [2024-11-09 07:27:36,980 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 237 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 533 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 788 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 533 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:27:36,981 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [237 Valid, 37 Invalid, 788 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 533 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:27:36,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2024-11-09 07:27:37,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 143. [2024-11-09 07:27:37,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0633802816901408) internal successors, (151), 142 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:27:37,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 151 transitions. [2024-11-09 07:27:37,038 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 151 transitions. Word has length 104 [2024-11-09 07:27:37,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:27:37,038 INFO L471 AbstractCegarLoop]: Abstraction has 143 states and 151 transitions. [2024-11-09 07:27:37,038 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.8461538461538463) 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) [2024-11-09 07:27:37,038 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 151 transitions. [2024-11-09 07:27:37,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2024-11-09 07:27:37,039 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:27:37,039 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:27:37,052 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-11-09 07:27:37,239 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-09 07:27:37,240 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:27:37,240 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:27:37,240 INFO L85 PathProgramCache]: Analyzing trace with hash -1029632568, now seen corresponding path program 17 times [2024-11-09 07:27:37,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:27:37,240 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972401556] [2024-11-09 07:27:37,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:27:37,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:27:37,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:27:37,525 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 25 proven. 60 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2024-11-09 07:27:37,525 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:27:37,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972401556] [2024-11-09 07:27:37,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972401556] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:27:37,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794162553] [2024-11-09 07:27:37,525 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:27:37,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:37,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:27:37,527 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:27:37,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-09 07:27:37,666 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2024-11-09 07:27:37,666 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:27:37,668 INFO L255 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 19 conjuncts are in the unsatisfiable core [2024-11-09 07:27:37,669 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:27:37,919 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 48 proven. 43 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2024-11-09 07:27:37,919 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:27:38,160 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 42 proven. 49 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2024-11-09 07:27:38,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794162553] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:27:38,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [485998956] [2024-11-09 07:27:38,161 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:27:38,162 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:27:38,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:27:38,162 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:27:38,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:27:39,070 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:27:39,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14892#true' at error location [2024-11-09 07:27:39,794 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:27:39,794 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:27:39,794 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 28 [2024-11-09 07:27:39,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953233998] [2024-11-09 07:27:39,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:27:39,795 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-11-09 07:27:39,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:27:39,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-11-09 07:27:39,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=1437, Unknown=0, NotChecked=0, Total=1722 [2024-11-09 07:27:39,796 INFO L87 Difference]: Start difference. First operand 143 states and 151 transitions. Second operand has 28 states, 28 states have (on average 3.5) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:27:40,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:27:40,483 INFO L93 Difference]: Finished difference Result 155 states and 163 transitions. [2024-11-09 07:27:40,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-11-09 07:27:40,483 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.5) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 110 [2024-11-09 07:27:40,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:27:40,484 INFO L225 Difference]: With dead ends: 155 [2024-11-09 07:27:40,484 INFO L226 Difference]: Without dead ends: 123 [2024-11-09 07:27:40,485 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 286 SyntacticMatches, 19 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1253 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=577, Invalid=2503, Unknown=0, NotChecked=0, Total=3080 [2024-11-09 07:27:40,486 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 169 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 778 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 07:27:40,486 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 37 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 778 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 07:27:40,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2024-11-09 07:27:40,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2024-11-09 07:27:40,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0603448275862069) internal successors, (123), 116 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:27:40,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 123 transitions. [2024-11-09 07:27:40,517 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 123 transitions. Word has length 110 [2024-11-09 07:27:40,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:27:40,517 INFO L471 AbstractCegarLoop]: Abstraction has 117 states and 123 transitions. [2024-11-09 07:27:40,517 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.5) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:27:40,517 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 123 transitions. [2024-11-09 07:27:40,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2024-11-09 07:27:40,518 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:27:40,518 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:27:40,535 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2024-11-09 07:27:40,718 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:40,719 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:27:40,719 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:27:40,719 INFO L85 PathProgramCache]: Analyzing trace with hash -308971241, now seen corresponding path program 18 times [2024-11-09 07:27:40,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:27:40,719 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658487999] [2024-11-09 07:27:40,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:27:40,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:27:40,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:27:51,898 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 8 proven. 335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:27:51,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:27:51,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658487999] [2024-11-09 07:27:51,899 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658487999] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:27:51,899 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351839201] [2024-11-09 07:27:51,899 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:27:51,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:27:51,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:27:51,900 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:27:51,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-09 07:27:52,029 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:27:52,029 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:27:52,032 INFO L255 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 175 conjuncts are in the unsatisfiable core [2024-11-09 07:27:52,035 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:27:57,710 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 0 proven. 294 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2024-11-09 07:27:57,710 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:28:05,445 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 07:28:05,446 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 453 [2024-11-09 07:28:14,951 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 0 proven. 294 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2024-11-09 07:28:14,951 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351839201] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:28:14,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [789597868] [2024-11-09 07:28:14,953 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:28:14,953 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:28:14,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:28:14,953 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:28:14,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:28:15,760 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:28:19,036 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16014#true' at error location [2024-11-09 07:28:19,036 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:28:19,036 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:28:19,036 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 48, 49] total 153 [2024-11-09 07:28:19,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979191068] [2024-11-09 07:28:19,037 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:28:19,037 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2024-11-09 07:28:19,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:28:19,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2024-11-09 07:28:19,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=930, Invalid=27126, Unknown=0, NotChecked=0, Total=28056 [2024-11-09 07:28:19,039 INFO L87 Difference]: Start difference. First operand 117 states and 123 transitions. Second operand has 153 states, 153 states have (on average 2.065359477124183) internal successors, (316), 153 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:28:59,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:28:59,725 INFO L93 Difference]: Finished difference Result 535 states and 573 transitions. [2024-11-09 07:28:59,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 231 states. [2024-11-09 07:28:59,726 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 2.065359477124183) internal successors, (316), 153 states have internal predecessors, (316), 0 states have call successors, (0), 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 116 [2024-11-09 07:28:59,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:28:59,727 INFO L225 Difference]: With dead ends: 535 [2024-11-09 07:28:59,727 INFO L226 Difference]: Without dead ends: 497 [2024-11-09 07:28:59,731 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 576 GetRequests, 239 SyntacticMatches, 5 SemanticMatches, 332 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34931 ImplicationChecksByTransitivity, 47.5s TimeCoverageRelationStatistics Valid=4649, Invalid=106573, Unknown=0, NotChecked=0, Total=111222 [2024-11-09 07:28:59,731 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 920 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 13380 mSolverCounterSat, 1000 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 920 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 14380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1000 IncrementalHoareTripleChecker+Valid, 13380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:28:59,732 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [920 Valid, 424 Invalid, 14380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1000 Valid, 13380 Invalid, 0 Unknown, 0 Unchecked, 10.8s Time] [2024-11-09 07:28:59,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 497 states. [2024-11-09 07:28:59,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 497 to 207. [2024-11-09 07:28:59,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 1.0679611650485437) internal successors, (220), 206 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:28:59,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 220 transitions. [2024-11-09 07:28:59,810 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 220 transitions. Word has length 116 [2024-11-09 07:28:59,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:28:59,811 INFO L471 AbstractCegarLoop]: Abstraction has 207 states and 220 transitions. [2024-11-09 07:28:59,811 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 2.065359477124183) internal successors, (316), 153 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:28:59,811 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 220 transitions. [2024-11-09 07:28:59,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2024-11-09 07:28:59,812 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:28:59,812 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:28:59,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2024-11-09 07:29:00,013 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:00,013 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:29:00,013 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:29:00,013 INFO L85 PathProgramCache]: Analyzing trace with hash -474882244, now seen corresponding path program 19 times [2024-11-09 07:29:00,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:29:00,014 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346280138] [2024-11-09 07:29:00,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:29:00,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:29:00,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:00,309 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2024-11-09 07:29:00,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:29:00,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346280138] [2024-11-09 07:29:00,310 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346280138] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:29:00,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226124439] [2024-11-09 07:29:00,310 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:29:00,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:00,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:29:00,311 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:29:00,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-09 07:29:00,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:00,436 INFO L255 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-09 07:29:00,438 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:29:00,672 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2024-11-09 07:29:00,672 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:29:00,842 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2024-11-09 07:29:00,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226124439] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:29:00,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [65440675] [2024-11-09 07:29:00,843 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:29:00,843 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:29:00,844 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:29:00,844 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:29:00,844 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:29:01,648 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:29:02,513 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18296#true' at error location [2024-11-09 07:29:02,514 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:29:02,514 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:29:02,514 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-09 07:29:02,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891101211] [2024-11-09 07:29:02,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:29:02,515 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-09 07:29:02,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:29:02,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-09 07:29:02,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1602, Unknown=0, NotChecked=0, Total=1892 [2024-11-09 07:29:02,521 INFO L87 Difference]: Start difference. First operand 207 states and 220 transitions. Second operand has 29 states, 29 states have (on average 2.7586206896551726) internal successors, (80), 29 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:29:03,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:29:03,316 INFO L93 Difference]: Finished difference Result 409 states and 436 transitions. [2024-11-09 07:29:03,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-09 07:29:03,317 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.7586206896551726) internal successors, (80), 29 states have internal predecessors, (80), 0 states have call successors, (0), 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 118 [2024-11-09 07:29:03,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:29:03,318 INFO L225 Difference]: With dead ends: 409 [2024-11-09 07:29:03,318 INFO L226 Difference]: Without dead ends: 174 [2024-11-09 07:29:03,319 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 310 SyntacticMatches, 19 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1057 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=416, Invalid=2134, Unknown=0, NotChecked=0, Total=2550 [2024-11-09 07:29:03,320 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 268 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 641 mSolverCounterSat, 288 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 929 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 288 IncrementalHoareTripleChecker+Valid, 641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:29:03,320 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 43 Invalid, 929 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [288 Valid, 641 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 07:29:03,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2024-11-09 07:29:03,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 161. [2024-11-09 07:29:03,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 160 states have (on average 1.05625) internal successors, (169), 160 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:29:03,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 169 transitions. [2024-11-09 07:29:03,383 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 169 transitions. Word has length 118 [2024-11-09 07:29:03,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:29:03,383 INFO L471 AbstractCegarLoop]: Abstraction has 161 states and 169 transitions. [2024-11-09 07:29:03,384 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.7586206896551726) internal successors, (80), 29 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:29:03,384 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 169 transitions. [2024-11-09 07:29:03,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2024-11-09 07:29:03,384 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:29:03,384 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:29:03,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2024-11-09 07:29:03,584 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:03,585 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:29:03,585 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:29:03,585 INFO L85 PathProgramCache]: Analyzing trace with hash -268171925, now seen corresponding path program 20 times [2024-11-09 07:29:03,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:29:03,585 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668647499] [2024-11-09 07:29:03,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:29:03,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:29:03,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:03,883 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2024-11-09 07:29:03,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:29:03,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668647499] [2024-11-09 07:29:03,883 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1668647499] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:29:03,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717850536] [2024-11-09 07:29:03,883 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:29:03,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:03,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:29:03,884 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:29:03,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-09 07:29:04,048 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2024-11-09 07:29:04,048 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:29:04,050 INFO L255 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-09 07:29:04,052 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:29:04,299 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 56 proven. 57 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2024-11-09 07:29:04,299 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:29:04,538 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 56 proven. 57 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2024-11-09 07:29:04,538 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717850536] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:29:04,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [721289741] [2024-11-09 07:29:04,540 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:29:04,540 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:29:04,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:29:04,540 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:29:04,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:29:05,301 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:29:06,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19898#true' at error location [2024-11-09 07:29:06,032 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:29:06,032 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:29:06,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-09 07:29:06,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627096647] [2024-11-09 07:29:06,032 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:29:06,032 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-09 07:29:06,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:29:06,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-09 07:29:06,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1514, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 07:29:06,033 INFO L87 Difference]: Start difference. First operand 161 states and 169 transitions. Second operand has 29 states, 29 states have (on average 3.413793103448276) internal successors, (99), 29 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:29:06,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:29:06,873 INFO L93 Difference]: Finished difference Result 173 states and 181 transitions. [2024-11-09 07:29:06,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-09 07:29:06,876 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.413793103448276) internal successors, (99), 29 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 124 [2024-11-09 07:29:06,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:29:06,877 INFO L225 Difference]: With dead ends: 173 [2024-11-09 07:29:06,877 INFO L226 Difference]: Without dead ends: 137 [2024-11-09 07:29:06,878 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 328 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1380 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=621, Invalid=2801, Unknown=0, NotChecked=0, Total=3422 [2024-11-09 07:29:06,878 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 272 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 882 mSolverCounterSat, 281 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 1163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 281 IncrementalHoareTripleChecker+Valid, 882 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 07:29:06,878 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 28 Invalid, 1163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [281 Valid, 882 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 07:29:06,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2024-11-09 07:29:06,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 131. [2024-11-09 07:29:06,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0538461538461539) internal successors, (137), 130 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:29:06,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 137 transitions. [2024-11-09 07:29:06,923 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 137 transitions. Word has length 124 [2024-11-09 07:29:06,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:29:06,924 INFO L471 AbstractCegarLoop]: Abstraction has 131 states and 137 transitions. [2024-11-09 07:29:06,924 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.413793103448276) internal successors, (99), 29 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:29:06,924 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 137 transitions. [2024-11-09 07:29:06,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2024-11-09 07:29:06,925 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:29:06,925 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:29:06,939 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2024-11-09 07:29:07,125 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2024-11-09 07:29:07,126 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:29:07,126 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:29:07,126 INFO L85 PathProgramCache]: Analyzing trace with hash -1886434694, now seen corresponding path program 21 times [2024-11-09 07:29:07,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:29:07,126 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661749346] [2024-11-09 07:29:07,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:29:07,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:29:07,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:29:22,530 INFO L134 CoverageAnalysis]: Checked inductivity of 448 backedges. 20 proven. 428 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:29:22,530 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:29:22,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661749346] [2024-11-09 07:29:22,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661749346] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:29:22,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384033083] [2024-11-09 07:29:22,531 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:29:22,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:29:22,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:29:22,533 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:29:22,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-09 07:29:22,711 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:29:22,711 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:29:22,717 INFO L255 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 203 conjuncts are in the unsatisfiable core [2024-11-09 07:29:22,724 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:29:22,852 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-11-09 07:29:30,807 INFO L134 CoverageAnalysis]: Checked inductivity of 448 backedges. 0 proven. 384 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2024-11-09 07:29:30,807 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:29:44,782 INFO L134 CoverageAnalysis]: Checked inductivity of 448 backedges. 0 proven. 384 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2024-11-09 07:29:44,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384033083] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:29:44,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1252724618] [2024-11-09 07:29:44,784 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:29:44,784 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:29:44,784 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:29:44,785 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:29:44,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:29:45,520 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:29:50,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21157#true' at error location [2024-11-09 07:29:50,294 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:29:50,294 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:29:50,294 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 54, 55] total 172 [2024-11-09 07:29:50,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546029040] [2024-11-09 07:29:50,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:29:50,295 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2024-11-09 07:29:50,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:29:50,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2024-11-09 07:29:50,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=851, Invalid=33931, Unknown=0, NotChecked=0, Total=34782 [2024-11-09 07:29:50,298 INFO L87 Difference]: Start difference. First operand 131 states and 137 transitions. Second operand has 172 states, 172 states have (on average 2.058139534883721) internal successors, (354), 172 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:30:47,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:30:47,459 INFO L93 Difference]: Finished difference Result 507 states and 537 transitions. [2024-11-09 07:30:47,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2024-11-09 07:30:47,460 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 172 states have (on average 2.058139534883721) internal successors, (354), 172 states have internal predecessors, (354), 0 states have call successors, (0), 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 130 [2024-11-09 07:30:47,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:30:47,462 INFO L225 Difference]: With dead ends: 507 [2024-11-09 07:30:47,462 INFO L226 Difference]: Without dead ends: 465 [2024-11-09 07:30:47,469 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 269 SyntacticMatches, 5 SemanticMatches, 344 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27150 ImplicationChecksByTransitivity, 71.3s TimeCoverageRelationStatistics Valid=4334, Invalid=115036, Unknown=0, NotChecked=0, Total=119370 [2024-11-09 07:30:47,469 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 718 mSDsluCounter, 535 mSDsCounter, 0 mSdLazyCounter, 18566 mSolverCounterSat, 878 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 718 SdHoareTripleChecker+Valid, 552 SdHoareTripleChecker+Invalid, 19444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 878 IncrementalHoareTripleChecker+Valid, 18566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.9s IncrementalHoareTripleChecker+Time [2024-11-09 07:30:47,470 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [718 Valid, 552 Invalid, 19444 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [878 Valid, 18566 Invalid, 0 Unknown, 0 Unchecked, 14.9s Time] [2024-11-09 07:30:47,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2024-11-09 07:30:47,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 231. [2024-11-09 07:30:47,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 230 states have (on average 1.0608695652173914) internal successors, (244), 230 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:30:47,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 244 transitions. [2024-11-09 07:30:47,590 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 244 transitions. Word has length 130 [2024-11-09 07:30:47,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:30:47,591 INFO L471 AbstractCegarLoop]: Abstraction has 231 states and 244 transitions. [2024-11-09 07:30:47,591 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 172 states, 172 states have (on average 2.058139534883721) internal successors, (354), 172 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:30:47,592 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 244 transitions. [2024-11-09 07:30:47,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2024-11-09 07:30:47,593 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:30:47,593 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:30:47,618 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2024-11-09 07:30:47,797 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2024-11-09 07:30:47,798 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:30:47,798 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:30:47,798 INFO L85 PathProgramCache]: Analyzing trace with hash -1732127777, now seen corresponding path program 22 times [2024-11-09 07:30:47,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:30:47,798 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17275806] [2024-11-09 07:30:47,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:30:47,799 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:30:47,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:30:48,214 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 66 proven. 79 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2024-11-09 07:30:48,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:30:48,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17275806] [2024-11-09 07:30:48,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17275806] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:30:48,215 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650077415] [2024-11-09 07:30:48,215 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:30:48,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:30:48,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:30:48,217 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:30:48,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-09 07:30:48,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:30:48,383 INFO L255 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-09 07:30:48,384 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:30:48,640 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 81 proven. 64 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2024-11-09 07:30:48,641 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:30:48,894 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 81 proven. 64 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2024-11-09 07:30:48,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650077415] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:30:48,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [980898644] [2024-11-09 07:30:48,896 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:30:48,896 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:30:48,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:30:48,896 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:30:48,896 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:30:49,792 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:30:51,113 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23525#true' at error location [2024-11-09 07:30:51,113 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:30:51,113 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:30:51,113 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2024-11-09 07:30:51,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686697342] [2024-11-09 07:30:51,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:30:51,114 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-09 07:30:51,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:30:51,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-09 07:30:51,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=1829, Unknown=0, NotChecked=0, Total=2162 [2024-11-09 07:30:51,115 INFO L87 Difference]: Start difference. First operand 231 states and 244 transitions. Second operand has 32 states, 32 states have (on average 2.6875) internal successors, (86), 32 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:30:52,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:30:52,188 INFO L93 Difference]: Finished difference Result 455 states and 482 transitions. [2024-11-09 07:30:52,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-09 07:30:52,188 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.6875) internal successors, (86), 32 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2024-11-09 07:30:52,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:30:52,189 INFO L225 Difference]: With dead ends: 455 [2024-11-09 07:30:52,190 INFO L226 Difference]: Without dead ends: 192 [2024-11-09 07:30:52,190 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 349 SyntacticMatches, 21 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1249 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=489, Invalid=2481, Unknown=0, NotChecked=0, Total=2970 [2024-11-09 07:30:52,191 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 336 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 656 mSolverCounterSat, 337 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 993 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 337 IncrementalHoareTripleChecker+Valid, 656 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 07:30:52,191 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 40 Invalid, 993 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [337 Valid, 656 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 07:30:52,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2024-11-09 07:30:52,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 179. [2024-11-09 07:30:52,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.050561797752809) internal successors, (187), 178 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:30:52,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 187 transitions. [2024-11-09 07:30:52,397 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 187 transitions. Word has length 132 [2024-11-09 07:30:52,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:30:52,397 INFO L471 AbstractCegarLoop]: Abstraction has 179 states and 187 transitions. [2024-11-09 07:30:52,398 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.6875) internal successors, (86), 32 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:30:52,398 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 187 transitions. [2024-11-09 07:30:52,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2024-11-09 07:30:52,402 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:30:52,403 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:30:52,433 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-09 07:30:52,603 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2024-11-09 07:30:52,603 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:30:52,604 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:30:52,604 INFO L85 PathProgramCache]: Analyzing trace with hash 1043375054, now seen corresponding path program 23 times [2024-11-09 07:30:52,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:30:52,604 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500569090] [2024-11-09 07:30:52,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:30:52,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:30:52,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:30:53,161 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 49 proven. 96 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2024-11-09 07:30:53,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:30:53,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500569090] [2024-11-09 07:30:53,162 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500569090] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:30:53,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [738168886] [2024-11-09 07:30:53,163 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:30:53,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:30:53,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:30:53,165 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:30:53,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-09 07:30:53,528 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2024-11-09 07:30:53,529 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:30:53,534 INFO L255 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-09 07:30:53,537 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:30:53,857 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 72 proven. 73 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2024-11-09 07:30:53,860 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:30:54,184 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 72 proven. 73 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2024-11-09 07:30:54,184 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [738168886] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:30:54,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1525334701] [2024-11-09 07:30:54,186 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:30:54,186 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:30:54,186 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:30:54,186 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:30:54,186 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:30:55,086 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:30:55,892 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25312#true' at error location [2024-11-09 07:30:55,892 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:30:55,892 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:30:55,892 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2024-11-09 07:30:55,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342309355] [2024-11-09 07:30:55,892 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:30:55,893 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-09 07:30:55,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:30:55,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-09 07:30:55,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=1735, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 07:30:55,894 INFO L87 Difference]: Start difference. First operand 179 states and 187 transitions. Second operand has 32 states, 32 states have (on average 3.4375) internal successors, (110), 32 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:30:56,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:30:56,956 INFO L93 Difference]: Finished difference Result 191 states and 199 transitions. [2024-11-09 07:30:56,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2024-11-09 07:30:56,957 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 32 states have internal predecessors, (110), 0 states have call successors, (0), 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 138 [2024-11-09 07:30:56,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:30:56,958 INFO L225 Difference]: With dead ends: 191 [2024-11-09 07:30:56,958 INFO L226 Difference]: Without dead ends: 151 [2024-11-09 07:30:56,959 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 377 SyntacticMatches, 22 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1645 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=732, Invalid=3300, Unknown=0, NotChecked=0, Total=4032 [2024-11-09 07:30:56,959 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 261 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1081 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 1338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 1081 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 07:30:56,959 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 34 Invalid, 1338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 1081 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 07:30:56,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2024-11-09 07:30:57,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2024-11-09 07:30:57,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0486111111111112) internal successors, (151), 144 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:30:57,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 151 transitions. [2024-11-09 07:30:57,050 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 151 transitions. Word has length 138 [2024-11-09 07:30:57,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:30:57,051 INFO L471 AbstractCegarLoop]: Abstraction has 145 states and 151 transitions. [2024-11-09 07:30:57,051 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 32 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:30:57,051 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 151 transitions. [2024-11-09 07:30:57,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2024-11-09 07:30:57,052 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:30:57,052 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:30:57,074 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2024-11-09 07:30:57,256 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2024-11-09 07:30:57,257 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:30:57,257 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:30:57,257 INFO L85 PathProgramCache]: Analyzing trace with hash -129584483, now seen corresponding path program 24 times [2024-11-09 07:30:57,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:30:57,257 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342994586] [2024-11-09 07:30:57,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:30:57,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:30:57,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:31:20,288 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 51 proven. 516 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:31:20,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:31:20,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342994586] [2024-11-09 07:31:20,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342994586] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:31:20,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012749930] [2024-11-09 07:31:20,289 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:31:20,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:31:20,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:31:20,290 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:31:20,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-09 07:31:20,498 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:31:20,498 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:31:20,506 INFO L255 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 223 conjuncts are in the unsatisfiable core [2024-11-09 07:31:20,512 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:31:32,352 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2024-11-09 07:31:32,352 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:31:53,233 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 07:31:53,234 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 743 [2024-11-09 07:32:19,040 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2024-11-09 07:32:19,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012749930] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:32:19,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [556916346] [2024-11-09 07:32:19,042 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:32:19,042 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:32:19,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:32:19,043 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:32:19,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:32:20,084 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:32:26,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26720#true' at error location [2024-11-09 07:32:26,126 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:32:26,126 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:32:26,126 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 60, 61] total 191 [2024-11-09 07:32:26,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075356318] [2024-11-09 07:32:26,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:32:26,127 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 191 states [2024-11-09 07:32:26,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:32:26,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2024-11-09 07:32:26,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=918, Invalid=41312, Unknown=0, NotChecked=0, Total=42230 [2024-11-09 07:32:26,131 INFO L87 Difference]: Start difference. First operand 145 states and 151 transitions. Second operand has 191 states, 191 states have (on average 2.0523560209424083) internal successors, (392), 191 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:33:44,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:33:44,630 INFO L93 Difference]: Finished difference Result 348 states and 369 transitions. [2024-11-09 07:33:44,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2024-11-09 07:33:44,631 INFO L78 Accepts]: Start accepts. Automaton has has 191 states, 191 states have (on average 2.0523560209424083) internal successors, (392), 191 states have internal predecessors, (392), 0 states have call successors, (0), 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 144 [2024-11-09 07:33:44,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:33:44,633 INFO L225 Difference]: With dead ends: 348 [2024-11-09 07:33:44,633 INFO L226 Difference]: Without dead ends: 342 [2024-11-09 07:33:44,638 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 299 SyntacticMatches, 5 SemanticMatches, 329 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26585 ImplicationChecksByTransitivity, 90.2s TimeCoverageRelationStatistics Valid=4600, Invalid=104630, Unknown=0, NotChecked=0, Total=109230 [2024-11-09 07:33:44,638 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 1479 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 25487 mSolverCounterSat, 1503 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1479 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 26990 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 1503 IncrementalHoareTripleChecker+Valid, 25487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:33:44,639 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1479 Valid, 318 Invalid, 26990 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [1503 Valid, 25487 Invalid, 0 Unknown, 0 Unchecked, 28.8s Time] [2024-11-09 07:33:44,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2024-11-09 07:33:44,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 190. [2024-11-09 07:33:44,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.052910052910053) internal successors, (199), 189 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:33:44,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 199 transitions. [2024-11-09 07:33:44,744 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 199 transitions. Word has length 144 [2024-11-09 07:33:44,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:33:44,745 INFO L471 AbstractCegarLoop]: Abstraction has 190 states and 199 transitions. [2024-11-09 07:33:44,746 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 191 states, 191 states have (on average 2.0523560209424083) internal successors, (392), 191 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:33:44,746 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 199 transitions. [2024-11-09 07:33:44,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2024-11-09 07:33:44,747 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:33:44,747 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:33:44,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2024-11-09 07:33:44,948 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-11-09 07:33:44,948 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:33:44,949 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:33:44,949 INFO L85 PathProgramCache]: Analyzing trace with hash -1853745758, now seen corresponding path program 25 times [2024-11-09 07:33:44,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:33:44,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090839390] [2024-11-09 07:33:44,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:33:44,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:33:44,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:33:45,441 INFO L134 CoverageAnalysis]: Checked inductivity of 586 backedges. 83 proven. 98 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2024-11-09 07:33:45,441 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:33:45,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090839390] [2024-11-09 07:33:45,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090839390] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:33:45,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903348913] [2024-11-09 07:33:45,442 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:33:45,442 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:33:45,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:33:45,443 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:33:45,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2024-11-09 07:33:45,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:33:45,627 INFO L255 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-09 07:33:45,630 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:33:46,066 INFO L134 CoverageAnalysis]: Checked inductivity of 586 backedges. 100 proven. 81 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2024-11-09 07:33:46,067 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:33:46,408 INFO L134 CoverageAnalysis]: Checked inductivity of 586 backedges. 100 proven. 81 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2024-11-09 07:33:46,409 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903348913] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:33:46,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1348284360] [2024-11-09 07:33:46,410 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:33:46,410 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:33:46,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:33:46,411 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:33:46,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:33:47,454 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:33:48,834 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28824#true' at error location [2024-11-09 07:33:48,834 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:33:48,834 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:33:48,834 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2024-11-09 07:33:48,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597792810] [2024-11-09 07:33:48,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:33:48,835 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-09 07:33:48,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:33:48,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-09 07:33:48,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=2070, Unknown=0, NotChecked=0, Total=2450 [2024-11-09 07:33:48,837 INFO L87 Difference]: Start difference. First operand 190 states and 199 transitions. Second operand has 35 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 35 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:33:50,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:33:50,174 INFO L93 Difference]: Finished difference Result 481 states and 508 transitions. [2024-11-09 07:33:50,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-11-09 07:33:50,174 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 35 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 146 [2024-11-09 07:33:50,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:33:50,176 INFO L225 Difference]: With dead ends: 481 [2024-11-09 07:33:50,176 INFO L226 Difference]: Without dead ends: 210 [2024-11-09 07:33:50,177 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 388 SyntacticMatches, 23 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1456 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=569, Invalid=2853, Unknown=0, NotChecked=0, Total=3422 [2024-11-09 07:33:50,177 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 550 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 748 mSolverCounterSat, 599 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 550 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 1347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 599 IncrementalHoareTripleChecker+Valid, 748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:33:50,178 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [550 Valid, 37 Invalid, 1347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [599 Valid, 748 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:33:50,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2024-11-09 07:33:50,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 197. [2024-11-09 07:33:50,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 196 states have (on average 1.0459183673469388) internal successors, (205), 196 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:33:50,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 205 transitions. [2024-11-09 07:33:50,283 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 205 transitions. Word has length 146 [2024-11-09 07:33:50,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:33:50,283 INFO L471 AbstractCegarLoop]: Abstraction has 197 states and 205 transitions. [2024-11-09 07:33:50,284 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 35 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:33:50,284 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 205 transitions. [2024-11-09 07:33:50,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2024-11-09 07:33:50,284 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:33:50,285 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:33:50,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2024-11-09 07:33:50,485 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:33:50,485 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:33:50,486 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:33:50,486 INFO L85 PathProgramCache]: Analyzing trace with hash 918821105, now seen corresponding path program 26 times [2024-11-09 07:33:50,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:33:50,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496737089] [2024-11-09 07:33:50,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:33:50,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:33:50,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:33:51,094 INFO L134 CoverageAnalysis]: Checked inductivity of 643 backedges. 64 proven. 117 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2024-11-09 07:33:51,094 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:33:51,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496737089] [2024-11-09 07:33:51,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496737089] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:33:51,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248064467] [2024-11-09 07:33:51,095 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:33:51,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:33:51,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:33:51,096 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:33:51,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2024-11-09 07:33:51,388 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2024-11-09 07:33:51,388 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:33:51,392 INFO L255 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-09 07:33:51,394 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:33:51,747 INFO L134 CoverageAnalysis]: Checked inductivity of 643 backedges. 90 proven. 91 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2024-11-09 07:33:51,747 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:33:52,146 INFO L134 CoverageAnalysis]: Checked inductivity of 643 backedges. 90 proven. 91 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2024-11-09 07:33:52,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1248064467] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:33:52,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2034604816] [2024-11-09 07:33:52,148 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:33:52,148 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:33:52,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:33:52,149 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:33:52,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:33:53,343 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:33:54,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30766#true' at error location [2024-11-09 07:33:54,412 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:33:54,412 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:33:54,413 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2024-11-09 07:33:54,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319014636] [2024-11-09 07:33:54,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:33:54,413 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-09 07:33:54,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:33:54,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-09 07:33:54,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1970, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 07:33:54,415 INFO L87 Difference]: Start difference. First operand 197 states and 205 transitions. Second operand has 35 states, 35 states have (on average 3.257142857142857) internal successors, (114), 35 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:33:55,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:33:55,824 INFO L93 Difference]: Finished difference Result 209 states and 217 transitions. [2024-11-09 07:33:55,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2024-11-09 07:33:55,825 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.257142857142857) internal successors, (114), 35 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 152 [2024-11-09 07:33:55,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:33:55,826 INFO L225 Difference]: With dead ends: 209 [2024-11-09 07:33:55,826 INFO L226 Difference]: Without dead ends: 165 [2024-11-09 07:33:55,827 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 408 SyntacticMatches, 24 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1932 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=853, Invalid=3839, Unknown=0, NotChecked=0, Total=4692 [2024-11-09 07:33:55,827 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 363 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 980 mSolverCounterSat, 380 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 1360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 380 IncrementalHoareTripleChecker+Valid, 980 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:33:55,828 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [363 Valid, 37 Invalid, 1360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [380 Valid, 980 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:33:55,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2024-11-09 07:33:55,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 159. [2024-11-09 07:33:55,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.0443037974683544) internal successors, (165), 158 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:33:55,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 165 transitions. [2024-11-09 07:33:55,911 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 165 transitions. Word has length 152 [2024-11-09 07:33:55,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:33:55,911 INFO L471 AbstractCegarLoop]: Abstraction has 159 states and 165 transitions. [2024-11-09 07:33:55,911 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.257142857142857) internal successors, (114), 35 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:33:55,911 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 165 transitions. [2024-11-09 07:33:55,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2024-11-09 07:33:55,912 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:33:55,912 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:33:55,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2024-11-09 07:33:56,112 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-11-09 07:33:56,113 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:33:56,113 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:33:56,113 INFO L85 PathProgramCache]: Analyzing trace with hash -1045110400, now seen corresponding path program 27 times [2024-11-09 07:33:56,114 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:33:56,114 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278457856] [2024-11-09 07:33:56,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:33:56,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:33:56,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:34:25,939 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 92 proven. 608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:34:25,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:34:25,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278457856] [2024-11-09 07:34:25,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1278457856] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:34:25,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625856437] [2024-11-09 07:34:25,939 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:34:25,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:34:25,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:34:25,941 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:34:25,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2024-11-09 07:34:26,136 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:34:26,136 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:34:26,142 INFO L255 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 249 conjuncts are in the unsatisfiable core [2024-11-09 07:34:26,146 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:34:26,317 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-11-09 07:34:41,999 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2024-11-09 07:34:41,999 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:35:05,299 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2024-11-09 07:35:05,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625856437] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:35:05,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2106111676] [2024-11-09 07:35:05,300 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:35:05,300 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:35:05,300 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:35:05,301 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:35:05,301 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:35:06,111 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:35:13,698 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32305#true' at error location [2024-11-09 07:35:13,699 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:35:13,699 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:35:13,699 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 66, 67] total 210 [2024-11-09 07:35:13,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459478145] [2024-11-09 07:35:13,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:35:13,700 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 210 states [2024-11-09 07:35:13,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:35:13,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 210 interpolants. [2024-11-09 07:35:13,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1113, Invalid=49287, Unknown=0, NotChecked=0, Total=50400 [2024-11-09 07:35:13,706 INFO L87 Difference]: Start difference. First operand 159 states and 165 transitions. Second operand has 210 states, 210 states have (on average 2.0476190476190474) internal successors, (430), 210 states have internal predecessors, (430), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:36:44,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:36:44,642 INFO L93 Difference]: Finished difference Result 378 states and 399 transitions. [2024-11-09 07:36:44,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2024-11-09 07:36:44,643 INFO L78 Accepts]: Start accepts. Automaton has has 210 states, 210 states have (on average 2.0476190476190474) internal successors, (430), 210 states have internal predecessors, (430), 0 states have call successors, (0), 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 158 [2024-11-09 07:36:44,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:36:44,645 INFO L225 Difference]: With dead ends: 378 [2024-11-09 07:36:44,645 INFO L226 Difference]: Without dead ends: 372 [2024-11-09 07:36:44,653 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 329 SyntacticMatches, 5 SemanticMatches, 363 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35832 ImplicationChecksByTransitivity, 110.0s TimeCoverageRelationStatistics Valid=5583, Invalid=127277, Unknown=0, NotChecked=0, Total=132860 [2024-11-09 07:36:44,654 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 1784 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 26445 mSolverCounterSat, 1800 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1784 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 28245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 1800 IncrementalHoareTripleChecker+Valid, 26445 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.1s IncrementalHoareTripleChecker+Time [2024-11-09 07:36:44,654 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1784 Valid, 317 Invalid, 28245 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [1800 Valid, 26445 Invalid, 0 Unknown, 0 Unchecked, 32.1s Time] [2024-11-09 07:36:44,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2024-11-09 07:36:44,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 208. [2024-11-09 07:36:44,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 207 states have (on average 1.0483091787439613) internal successors, (217), 207 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:36:44,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 217 transitions. [2024-11-09 07:36:44,819 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 217 transitions. Word has length 158 [2024-11-09 07:36:44,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:36:44,819 INFO L471 AbstractCegarLoop]: Abstraction has 208 states and 217 transitions. [2024-11-09 07:36:44,820 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 210 states, 210 states have (on average 2.0476190476190474) internal successors, (430), 210 states have internal predecessors, (430), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:36:44,820 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 217 transitions. [2024-11-09 07:36:44,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2024-11-09 07:36:44,820 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:36:44,821 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:36:44,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2024-11-09 07:36:45,021 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-11-09 07:36:45,022 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:36:45,022 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:36:45,022 INFO L85 PathProgramCache]: Analyzing trace with hash -329209915, now seen corresponding path program 28 times [2024-11-09 07:36:45,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:36:45,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49806266] [2024-11-09 07:36:45,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:36:45,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:36:45,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:36:45,591 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 102 proven. 119 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2024-11-09 07:36:45,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:36:45,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49806266] [2024-11-09 07:36:45,591 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49806266] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:36:45,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970352546] [2024-11-09 07:36:45,591 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 07:36:45,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:36:45,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:36:45,593 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:36:45,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2024-11-09 07:36:45,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:36:45,792 INFO L255 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-09 07:36:45,795 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:36:46,271 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 121 proven. 100 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2024-11-09 07:36:46,271 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:36:46,660 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 121 proven. 100 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2024-11-09 07:36:46,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970352546] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:36:46,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1376174940] [2024-11-09 07:36:46,661 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:36:46,661 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:36:46,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:36:46,662 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:36:46,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:36:47,769 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:36:49,108 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34614#true' at error location [2024-11-09 07:36:49,109 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:36:49,109 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:36:49,109 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2024-11-09 07:36:49,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045262629] [2024-11-09 07:36:49,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:36:49,110 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-09 07:36:49,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:36:49,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-09 07:36:49,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=2325, Unknown=0, NotChecked=0, Total=2756 [2024-11-09 07:36:49,111 INFO L87 Difference]: Start difference. First operand 208 states and 217 transitions. Second operand has 38 states, 38 states have (on average 2.5789473684210527) internal successors, (98), 38 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:36:50,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:36:50,548 INFO L93 Difference]: Finished difference Result 525 states and 552 transitions. [2024-11-09 07:36:50,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2024-11-09 07:36:50,549 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.5789473684210527) internal successors, (98), 38 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 160 [2024-11-09 07:36:50,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:36:50,551 INFO L225 Difference]: With dead ends: 525 [2024-11-09 07:36:50,551 INFO L226 Difference]: Without dead ends: 228 [2024-11-09 07:36:50,552 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 427 SyntacticMatches, 25 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1678 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=656, Invalid=3250, Unknown=0, NotChecked=0, Total=3906 [2024-11-09 07:36:50,552 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 478 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 871 mSolverCounterSat, 507 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 478 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 1378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 507 IncrementalHoareTripleChecker+Valid, 871 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 07:36:50,552 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [478 Valid, 37 Invalid, 1378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [507 Valid, 871 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 07:36:50,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2024-11-09 07:36:50,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 215. [2024-11-09 07:36:50,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.0420560747663552) internal successors, (223), 214 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:36:50,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 223 transitions. [2024-11-09 07:36:50,685 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 223 transitions. Word has length 160 [2024-11-09 07:36:50,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:36:50,686 INFO L471 AbstractCegarLoop]: Abstraction has 215 states and 223 transitions. [2024-11-09 07:36:50,686 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.5789473684210527) internal successors, (98), 38 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:36:50,686 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 223 transitions. [2024-11-09 07:36:50,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2024-11-09 07:36:50,687 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:36:50,687 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:36:50,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2024-11-09 07:36:50,887 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:36:50,888 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:36:50,888 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:36:50,888 INFO L85 PathProgramCache]: Analyzing trace with hash -1299737388, now seen corresponding path program 29 times [2024-11-09 07:36:50,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:36:50,888 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107011641] [2024-11-09 07:36:50,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:36:50,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:36:50,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:36:51,609 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 81 proven. 140 refuted. 0 times theorem prover too weak. 563 trivial. 0 not checked. [2024-11-09 07:36:51,609 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:36:51,610 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107011641] [2024-11-09 07:36:51,610 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107011641] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:36:51,610 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351560070] [2024-11-09 07:36:51,610 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 07:36:51,610 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:36:51,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:36:51,611 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:36:51,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2024-11-09 07:36:51,971 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2024-11-09 07:36:51,971 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:36:51,975 INFO L255 TraceCheckSpWp]: Trace formula consists of 535 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-09 07:36:51,977 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:36:52,419 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 110 proven. 111 refuted. 0 times theorem prover too weak. 563 trivial. 0 not checked. [2024-11-09 07:36:52,419 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 07:36:52,943 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 110 proven. 111 refuted. 0 times theorem prover too weak. 563 trivial. 0 not checked. [2024-11-09 07:36:52,943 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351560070] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 07:36:52,943 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [801331288] [2024-11-09 07:36:52,944 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 07:36:52,944 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 07:36:52,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 07:36:52,945 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 07:36:52,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 07:36:53,910 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 07:36:54,998 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36738#true' at error location [2024-11-09 07:36:54,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 07:36:54,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 07:36:54,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2024-11-09 07:36:54,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021740795] [2024-11-09 07:36:54,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 07:36:54,999 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-09 07:36:54,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 07:36:55,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-09 07:36:55,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=2219, Unknown=0, NotChecked=0, Total=2652 [2024-11-09 07:36:55,000 INFO L87 Difference]: Start difference. First operand 215 states and 223 transitions. Second operand has 38 states, 38 states have (on average 3.8157894736842106) internal successors, (145), 38 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:36:56,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 07:36:56,613 INFO L93 Difference]: Finished difference Result 227 states and 235 transitions. [2024-11-09 07:36:56,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2024-11-09 07:36:56,613 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.8157894736842106) internal successors, (145), 38 states have internal predecessors, (145), 0 states have call successors, (0), 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 166 [2024-11-09 07:36:56,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 07:36:56,615 INFO L225 Difference]: With dead ends: 227 [2024-11-09 07:36:56,615 INFO L226 Difference]: Without dead ends: 179 [2024-11-09 07:36:56,616 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 447 SyntacticMatches, 26 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2241 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=984, Invalid=4418, Unknown=0, NotChecked=0, Total=5402 [2024-11-09 07:36:56,616 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 299 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1237 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 1546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 1237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-09 07:36:56,617 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 34 Invalid, 1546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 1237 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-09 07:36:56,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2024-11-09 07:36:56,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 173. [2024-11-09 07:36:56,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0406976744186047) internal successors, (179), 172 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:36:56,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 179 transitions. [2024-11-09 07:36:56,719 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 179 transitions. Word has length 166 [2024-11-09 07:36:56,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 07:36:56,719 INFO L471 AbstractCegarLoop]: Abstraction has 173 states and 179 transitions. [2024-11-09 07:36:56,719 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.8157894736842106) internal successors, (145), 38 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 07:36:56,719 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 179 transitions. [2024-11-09 07:36:56,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2024-11-09 07:36:56,720 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 07:36:56,721 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 07:36:56,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2024-11-09 07:36:56,921 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:36:56,922 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 07:36:56,922 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 07:36:56,922 INFO L85 PathProgramCache]: Analyzing trace with hash 67045155, now seen corresponding path program 30 times [2024-11-09 07:36:56,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 07:36:56,922 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227080391] [2024-11-09 07:36:56,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 07:36:56,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 07:36:57,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 07:37:34,929 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 97 proven. 750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 07:37:34,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 07:37:34,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227080391] [2024-11-09 07:37:34,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227080391] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 07:37:34,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106899575] [2024-11-09 07:37:34,930 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 07:37:34,930 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 07:37:34,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 07:37:34,932 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 07:37:34,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_063a3e4d-896a-4395-8546-0b52e4ea6189/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2024-11-09 07:37:35,272 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 07:37:35,272 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 07:37:35,278 INFO L255 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 276 conjuncts are in the unsatisfiable core [2024-11-09 07:37:35,287 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 07:37:35,535 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-11-09 07:37:55,660 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 0 proven. 726 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2024-11-09 07:37:55,660 INFO L311 TraceCheckSpWp]: Computing backward predicates...