./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a0165632 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/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_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/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_48020d59-50b1-48af-bbba-56506b6bedc2/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 1743decb4413dd023f2c21969cafbefd9f03a99467b1795f9affedc42875deb2 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-a016563 [2024-11-09 04:45:39,755 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-09 04:45:39,851 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-09 04:45:39,857 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-09 04:45:39,860 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-09 04:45:39,898 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-09 04:45:39,899 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-09 04:45:39,899 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-09 04:45:39,900 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-09 04:45:39,900 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-09 04:45:39,901 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-09 04:45:39,901 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-09 04:45:39,901 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-09 04:45:39,902 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-09 04:45:39,902 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-09 04:45:39,902 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-09 04:45:39,903 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-09 04:45:39,905 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-09 04:45:39,906 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-09 04:45:39,906 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-09 04:45:39,906 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-09 04:45:39,907 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-09 04:45:39,908 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-09 04:45:39,908 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-09 04:45:39,908 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-09 04:45:39,913 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-09 04:45:39,914 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-09 04:45:39,914 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-09 04:45:39,914 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-09 04:45:39,915 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-09 04:45:39,915 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-09 04:45:39,916 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-09 04:45:39,916 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-09 04:45:39,917 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-09 04:45:39,917 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-09 04:45:39,918 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-09 04:45:39,918 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-09 04:45:39,918 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-09 04:45:39,918 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 04:45:39,919 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-09 04:45:39,919 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-09 04:45:39,920 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-09 04:45:39,920 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-09 04:45:39,920 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-09 04:45:39,920 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-09 04:45:39,921 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-09 04:45:39,921 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-09 04:45:39,921 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_48020d59-50b1-48af-bbba-56506b6bedc2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1743decb4413dd023f2c21969cafbefd9f03a99467b1795f9affedc42875deb2 [2024-11-09 04:45:40,211 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-09 04:45:40,235 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-09 04:45:40,238 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-09 04:45:40,241 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-09 04:45:40,241 INFO L274 PluginConnector]: CDTParser initialized [2024-11-09 04:45:40,243 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/../../sv-benchmarks/c/array-crafted/zero_sum_m3.c Unable to find full path for "g++" [2024-11-09 04:45:42,343 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-09 04:45:42,538 INFO L384 CDTParser]: Found 1 translation units. [2024-11-09 04:45:42,538 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/sv-benchmarks/c/array-crafted/zero_sum_m3.c [2024-11-09 04:45:42,550 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/data/dd9e3ea54/82a4360931d14b36883a43bdf26d4d94/FLAGd5cf5e5fd [2024-11-09 04:45:42,909 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/data/dd9e3ea54/82a4360931d14b36883a43bdf26d4d94 [2024-11-09 04:45:42,912 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-09 04:45:42,914 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-09 04:45:42,916 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-09 04:45:42,916 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-09 04:45:42,923 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-09 04:45:42,923 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 04:45:42" (1/1) ... [2024-11-09 04:45:42,925 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57aeff2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:42, skipping insertion in model container [2024-11-09 04:45:42,926 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 04:45:42" (1/1) ... [2024-11-09 04:45:42,946 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-09 04:45:43,142 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_48020d59-50b1-48af-bbba-56506b6bedc2/sv-benchmarks/c/array-crafted/zero_sum_m3.c[402,415] [2024-11-09 04:45:43,174 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 04:45:43,182 INFO L200 MainTranslator]: Completed pre-run [2024-11-09 04:45:43,196 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_48020d59-50b1-48af-bbba-56506b6bedc2/sv-benchmarks/c/array-crafted/zero_sum_m3.c[402,415] [2024-11-09 04:45:43,213 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 04:45:43,233 INFO L204 MainTranslator]: Completed translation [2024-11-09 04:45:43,233 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43 WrapperNode [2024-11-09 04:45:43,233 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-09 04:45:43,234 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-09 04:45:43,234 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-09 04:45:43,235 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-09 04:45:43,240 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,246 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,269 INFO L138 Inliner]: procedures = 15, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 101 [2024-11-09 04:45:43,270 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-09 04:45:43,271 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-09 04:45:43,271 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-09 04:45:43,271 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-09 04:45:43,281 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,282 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,284 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,284 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,293 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,297 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,299 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,300 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,302 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-09 04:45:43,303 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-09 04:45:43,303 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-09 04:45:43,304 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-09 04:45:43,305 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (1/1) ... [2024-11-09 04:45:43,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 04:45:43,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:45:43,338 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-09 04:45:43,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-09 04:45:43,373 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-09 04:45:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-09 04:45:43,375 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-09 04:45:43,375 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-09 04:45:43,375 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-09 04:45:43,375 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-09 04:45:43,375 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2024-11-09 04:45:43,375 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-09 04:45:43,469 INFO L238 CfgBuilder]: Building ICFG [2024-11-09 04:45:43,471 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-09 04:45:43,730 INFO L? ?]: Removed 20 outVars from TransFormulas that were not future-live. [2024-11-09 04:45:43,730 INFO L287 CfgBuilder]: Performing block encoding [2024-11-09 04:45:43,763 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-09 04:45:43,763 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-09 04:45:43,764 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 04:45:43 BoogieIcfgContainer [2024-11-09 04:45:43,764 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-09 04:45:43,767 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-09 04:45:43,768 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-09 04:45:43,774 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-09 04:45:43,774 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 04:45:42" (1/3) ... [2024-11-09 04:45:43,775 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58d1833a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 04:45:43, skipping insertion in model container [2024-11-09 04:45:43,775 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 04:45:43" (2/3) ... [2024-11-09 04:45:43,778 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58d1833a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 04:45:43, skipping insertion in model container [2024-11-09 04:45:43,778 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 04:45:43" (3/3) ... [2024-11-09 04:45:43,780 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m3.c [2024-11-09 04:45:43,801 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-09 04:45:43,803 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-09 04:45:43,864 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-09 04:45:43,870 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;@1fa624fd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-09 04:45:43,870 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-09 04:45:43,874 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 04:45:43,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-11-09 04:45:43,881 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:45:43,882 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 04:45:43,883 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:45:43,888 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:45:43,888 INFO L85 PathProgramCache]: Analyzing trace with hash 1288797282, now seen corresponding path program 1 times [2024-11-09 04:45:43,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:45:43,896 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613676460] [2024-11-09 04:45:43,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:45:43,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:45:44,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:45:44,287 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 04:45:44,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:45:44,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613676460] [2024-11-09 04:45:44,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613676460] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 04:45:44,288 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 04:45:44,289 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-09 04:45:44,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448099302] [2024-11-09 04:45:44,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 04:45:44,296 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-09 04:45:44,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:45:44,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-09 04:45:44,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-09 04:45:44,319 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 04:45:44,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:45:44,413 INFO L93 Difference]: Finished difference Result 56 states and 85 transitions. [2024-11-09 04:45:44,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-09 04:45:44,419 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 04:45:44,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:45:44,429 INFO L225 Difference]: With dead ends: 56 [2024-11-09 04:45:44,429 INFO L226 Difference]: Without dead ends: 28 [2024-11-09 04:45:44,432 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 04:45:44,439 INFO L432 NwaCegarLoop]: 39 mSDtfsCounter, 1 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 04:45:44,441 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 49 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 04:45:44,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-09 04:45:44,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2024-11-09 04:45:44,475 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 04:45:44,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 41 transitions. [2024-11-09 04:45:44,478 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 41 transitions. Word has length 18 [2024-11-09 04:45:44,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:45:44,478 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 41 transitions. [2024-11-09 04:45:44,479 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 04:45:44,479 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 41 transitions. [2024-11-09 04:45:44,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2024-11-09 04:45:44,480 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:45:44,480 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 04:45:44,480 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-09 04:45:44,480 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:45:44,481 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:45:44,481 INFO L85 PathProgramCache]: Analyzing trace with hash 845702919, now seen corresponding path program 1 times [2024-11-09 04:45:44,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:45:44,482 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81371557] [2024-11-09 04:45:44,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:45:44,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:45:44,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:45:44,666 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 04:45:44,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:45:44,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81371557] [2024-11-09 04:45:44,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81371557] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 04:45:44,667 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 04:45:44,667 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-09 04:45:44,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867895182] [2024-11-09 04:45:44,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 04:45:44,669 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-09 04:45:44,669 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:45:44,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-09 04:45:44,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-09 04:45:44,670 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 04:45:44,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:45:44,797 INFO L93 Difference]: Finished difference Result 59 states and 93 transitions. [2024-11-09 04:45:44,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-09 04:45:44,798 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 04:45:44,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:45:44,798 INFO L225 Difference]: With dead ends: 59 [2024-11-09 04:45:44,798 INFO L226 Difference]: Without dead ends: 40 [2024-11-09 04:45:44,799 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 04:45:44,800 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 40 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 04:45:44,801 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 13 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 04:45:44,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2024-11-09 04:45:44,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2024-11-09 04:45:44,807 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 04:45:44,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 53 transitions. [2024-11-09 04:45:44,808 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 53 transitions. Word has length 20 [2024-11-09 04:45:44,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:45:44,809 INFO L471 AbstractCegarLoop]: Abstraction has 40 states and 53 transitions. [2024-11-09 04:45:44,809 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 04:45:44,809 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 53 transitions. [2024-11-09 04:45:44,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-11-09 04:45:44,810 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:45:44,810 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 04:45:44,810 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-09 04:45:44,811 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:45:44,811 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:45:44,811 INFO L85 PathProgramCache]: Analyzing trace with hash 1718447749, now seen corresponding path program 1 times [2024-11-09 04:45:44,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:45:44,812 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453921555] [2024-11-09 04:45:44,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:45:44,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:45:44,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:45:44,964 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 04:45:44,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:45:44,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453921555] [2024-11-09 04:45:44,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453921555] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:45:44,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173119137] [2024-11-09 04:45:44,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:45:44,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:45:44,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:45:44,968 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:45:44,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-09 04:45:45,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:45:45,074 INFO L255 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-09 04:45:45,081 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:45:45,175 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 04:45:45,175 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:45:45,231 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 04:45:45,231 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173119137] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:45:45,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [783529115] [2024-11-09 04:45:45,259 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:45:45,259 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:45:45,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:45:45,270 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:45:45,270 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:45:46,799 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:45:47,326 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '279#true' at error location [2024-11-09 04:45:47,326 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:45:47,327 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:45:47,327 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2024-11-09 04:45:47,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442986293] [2024-11-09 04:45:47,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:45:47,328 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-09 04:45:47,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:45:47,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-09 04:45:47,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2024-11-09 04:45:47,330 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 04:45:47,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:45:47,436 INFO L93 Difference]: Finished difference Result 76 states and 102 transitions. [2024-11-09 04:45:47,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-09 04:45:47,437 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 04:45:47,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:45:47,437 INFO L225 Difference]: With dead ends: 76 [2024-11-09 04:45:47,438 INFO L226 Difference]: Without dead ends: 42 [2024-11-09 04:45:47,438 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 78 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2024-11-09 04:45:47,440 INFO L432 NwaCegarLoop]: 35 mSDtfsCounter, 2 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 04:45:47,440 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 59 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 04:45:47,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2024-11-09 04:45:47,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2024-11-09 04:45:47,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.325) internal successors, (53), 40 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 04:45:47,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 53 transitions. [2024-11-09 04:45:47,447 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 53 transitions. Word has length 32 [2024-11-09 04:45:47,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:45:47,447 INFO L471 AbstractCegarLoop]: Abstraction has 41 states and 53 transitions. [2024-11-09 04:45:47,447 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 04:45:47,448 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 53 transitions. [2024-11-09 04:45:47,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-11-09 04:45:47,448 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:45:47,449 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 04:45:47,470 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-09 04:45:47,649 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:45:47,650 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:45:47,650 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:45:47,650 INFO L85 PathProgramCache]: Analyzing trace with hash 1192121450, now seen corresponding path program 2 times [2024-11-09 04:45:47,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:45:47,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699875992] [2024-11-09 04:45:47,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:45:47,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:45:47,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:45:47,850 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 04:45:47,851 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:45:47,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699875992] [2024-11-09 04:45:47,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [699875992] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:45:47,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131018209] [2024-11-09 04:45:47,851 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:45:47,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:45:47,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:45:47,854 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:45:47,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-09 04:45:47,935 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-09 04:45:47,935 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:45:47,936 INFO L255 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-09 04:45:47,938 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:45:48,008 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 04:45:48,009 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:45:48,047 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 04:45:48,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131018209] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:45:48,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [423444076] [2024-11-09 04:45:48,053 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:45:48,054 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:45:48,054 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:45:48,054 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:45:48,054 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:45:48,829 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:45:49,304 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '642#true' at error location [2024-11-09 04:45:49,305 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:45:49,305 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:45:49,305 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2024-11-09 04:45:49,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230894530] [2024-11-09 04:45:49,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:45:49,306 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-09 04:45:49,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:45:49,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-09 04:45:49,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2024-11-09 04:45:49,308 INFO L87 Difference]: Start difference. First operand 41 states and 53 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 04:45:49,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:45:49,489 INFO L93 Difference]: Finished difference Result 82 states and 115 transitions. [2024-11-09 04:45:49,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-09 04:45:49,490 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 04:45:49,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:45:49,491 INFO L225 Difference]: With dead ends: 82 [2024-11-09 04:45:49,491 INFO L226 Difference]: Without dead ends: 53 [2024-11-09 04:45:49,492 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 81 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2024-11-09 04:45:49,493 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 43 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 04:45:49,493 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 19 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 04:45:49,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2024-11-09 04:45:49,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2024-11-09 04:45:49,503 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 04:45:49,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2024-11-09 04:45:49,504 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 34 [2024-11-09 04:45:49,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:45:49,504 INFO L471 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2024-11-09 04:45:49,506 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 04:45:49,506 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2024-11-09 04:45:49,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-11-09 04:45:49,509 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:45:49,509 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 04:45:49,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-11-09 04:45:49,710 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:45:49,710 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:45:49,710 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:45:49,710 INFO L85 PathProgramCache]: Analyzing trace with hash 1640408936, now seen corresponding path program 3 times [2024-11-09 04:45:49,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:45:49,711 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295901751] [2024-11-09 04:45:49,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:45:49,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:45:49,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:45:52,793 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 04:45:52,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:45:52,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295901751] [2024-11-09 04:45:52,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295901751] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:45:52,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275741132] [2024-11-09 04:45:52,794 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:45:52,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:45:52,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:45:52,799 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:45:52,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-09 04:45:52,898 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:45:52,898 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:45:52,900 INFO L255 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 55 conjuncts are in the unsatisfiable core [2024-11-09 04:45:52,904 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:45:53,275 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 04:45:53,275 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:45:54,158 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:45:54,160 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 04:45:54,287 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 04:45:54,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275741132] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:45:54,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1943127136] [2024-11-09 04:45:54,291 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:45:54,291 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:45:54,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:45:54,292 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:45:54,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:45:55,106 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:45:56,134 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1043#true' at error location [2024-11-09 04:45:56,134 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:45:56,134 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:45:56,134 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 19] total 36 [2024-11-09 04:45:56,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297799179] [2024-11-09 04:45:56,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:45:56,135 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2024-11-09 04:45:56,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:45:56,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2024-11-09 04:45:56,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=2002, Unknown=0, NotChecked=0, Total=2162 [2024-11-09 04:45:56,137 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 36 states, 36 states have (on average 2.5) internal successors, (90), 36 states have internal predecessors, (90), 0 states have call successors, (0), 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 04:45:57,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:45:57,297 INFO L93 Difference]: Finished difference Result 90 states and 101 transitions. [2024-11-09 04:45:57,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-09 04:45:57,298 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.5) internal successors, (90), 36 states have internal predecessors, (90), 0 states have call successors, (0), 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 04:45:57,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:45:57,299 INFO L225 Difference]: With dead ends: 90 [2024-11-09 04:45:57,299 INFO L226 Difference]: Without dead ends: 86 [2024-11-09 04:45:57,300 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 111 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=160, Invalid=2002, Unknown=0, NotChecked=0, Total=2162 [2024-11-09 04:45:57,301 INFO L432 NwaCegarLoop]: 22 mSDtfsCounter, 8 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 1432 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 1433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2024-11-09 04:45:57,302 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 268 Invalid, 1433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1432 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2024-11-09 04:45:57,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2024-11-09 04:45:57,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 76. [2024-11-09 04:45:57,314 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 04:45:57,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 87 transitions. [2024-11-09 04:45:57,315 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 87 transitions. Word has length 46 [2024-11-09 04:45:57,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:45:57,315 INFO L471 AbstractCegarLoop]: Abstraction has 76 states and 87 transitions. [2024-11-09 04:45:57,316 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.5) internal successors, (90), 36 states have internal predecessors, (90), 0 states have call successors, (0), 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 04:45:57,316 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 87 transitions. [2024-11-09 04:45:57,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2024-11-09 04:45:57,317 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:45:57,317 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 04:45:57,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-09 04:45:57,518 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:45:57,518 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:45:57,518 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:45:57,518 INFO L85 PathProgramCache]: Analyzing trace with hash -742764819, now seen corresponding path program 4 times [2024-11-09 04:45:57,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:45:57,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889982822] [2024-11-09 04:45:57,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:45:57,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:45:57,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:45:57,705 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 04:45:57,705 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:45:57,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889982822] [2024-11-09 04:45:57,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889982822] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:45:57,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [564653004] [2024-11-09 04:45:57,706 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:45:57,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:45:57,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:45:57,708 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:45:57,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-09 04:45:57,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:45:57,783 INFO L255 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-09 04:45:57,785 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:45:57,860 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 04:45:57,861 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:45:57,923 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 04:45:57,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [564653004] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:45:57,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [647647067] [2024-11-09 04:45:57,926 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:45:57,927 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:45:57,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:45:57,927 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:45:57,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:45:58,621 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:45:59,159 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1598#true' at error location [2024-11-09 04:45:59,159 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:45:59,159 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:45:59,159 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2024-11-09 04:45:59,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235877749] [2024-11-09 04:45:59,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:45:59,160 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-09 04:45:59,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:45:59,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-09 04:45:59,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2024-11-09 04:45:59,161 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 04:45:59,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:45:59,389 INFO L93 Difference]: Finished difference Result 151 states and 173 transitions. [2024-11-09 04:45:59,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-09 04:45:59,389 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 04:45:59,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:45:59,391 INFO L225 Difference]: With dead ends: 151 [2024-11-09 04:45:59,393 INFO L226 Difference]: Without dead ends: 79 [2024-11-09 04:45:59,394 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 120 SyntacticMatches, 8 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2024-11-09 04:45:59,395 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 21 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 04:45:59,395 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 47 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 04:45:59,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2024-11-09 04:45:59,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2024-11-09 04:45:59,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.155844155844156) internal successors, (89), 77 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 04:45:59,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 89 transitions. [2024-11-09 04:45:59,406 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 89 transitions. Word has length 48 [2024-11-09 04:45:59,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:45:59,406 INFO L471 AbstractCegarLoop]: Abstraction has 78 states and 89 transitions. [2024-11-09 04:45:59,406 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 04:45:59,407 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 89 transitions. [2024-11-09 04:45:59,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2024-11-09 04:45:59,407 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:45:59,408 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 04:45:59,423 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-09 04:45:59,608 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:45:59,609 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:45:59,609 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:45:59,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1880831278, now seen corresponding path program 5 times [2024-11-09 04:45:59,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:45:59,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151086441] [2024-11-09 04:45:59,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:45:59,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:45:59,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:45:59,771 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 04:45:59,772 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:45:59,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151086441] [2024-11-09 04:45:59,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151086441] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:45:59,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134687292] [2024-11-09 04:45:59,772 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:45:59,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:45:59,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:45:59,775 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:45:59,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-09 04:45:59,864 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 04:45:59,864 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:45:59,865 INFO L255 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-09 04:45:59,867 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:45:59,974 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 04:45:59,974 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:46:00,069 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 04:46:00,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134687292] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:46:00,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136823535] [2024-11-09 04:46:00,072 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:46:00,072 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:46:00,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:46:00,073 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:46:00,074 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:46:00,603 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:46:01,075 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2240#true' at error location [2024-11-09 04:46:01,075 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:46:01,076 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:46:01,076 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2024-11-09 04:46:01,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127439953] [2024-11-09 04:46:01,076 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:46:01,077 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-09 04:46:01,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:46:01,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-09 04:46:01,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2024-11-09 04:46:01,078 INFO L87 Difference]: Start difference. First operand 78 states and 89 transitions. Second operand has 14 states, 14 states have (on average 4.5) internal successors, (63), 14 states have internal predecessors, (63), 0 states have call successors, (0), 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 04:46:01,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:46:01,282 INFO L93 Difference]: Finished difference Result 124 states and 144 transitions. [2024-11-09 04:46:01,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-09 04:46:01,283 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.5) internal successors, (63), 14 states have internal predecessors, (63), 0 states have call successors, (0), 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 04:46:01,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:46:01,284 INFO L225 Difference]: With dead ends: 124 [2024-11-09 04:46:01,284 INFO L226 Difference]: Without dead ends: 67 [2024-11-09 04:46:01,284 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 124 SyntacticMatches, 9 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=115, Invalid=641, Unknown=0, NotChecked=0, Total=756 [2024-11-09 04:46:01,285 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 45 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 04:46:01,286 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 40 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 04:46:01,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2024-11-09 04:46:01,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2024-11-09 04:46:01,300 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 04:46:01,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2024-11-09 04:46:01,301 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 50 [2024-11-09 04:46:01,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:46:01,301 INFO L471 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2024-11-09 04:46:01,301 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.5) internal successors, (63), 14 states have internal predecessors, (63), 0 states have call successors, (0), 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 04:46:01,301 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2024-11-09 04:46:01,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2024-11-09 04:46:01,306 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:46:01,306 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 04:46:01,329 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-09 04:46:01,507 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-09 04:46:01,507 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:46:01,508 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:46:01,508 INFO L85 PathProgramCache]: Analyzing trace with hash -1180543221, now seen corresponding path program 6 times [2024-11-09 04:46:01,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:46:01,509 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [982166420] [2024-11-09 04:46:01,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:46:01,509 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:46:01,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:46:06,108 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 04:46:06,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:46:06,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [982166420] [2024-11-09 04:46:06,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [982166420] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:46:06,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266798912] [2024-11-09 04:46:06,109 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:46:06,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:46:06,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:46:06,112 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:46:06,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-09 04:46:06,207 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:46:06,207 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:46:06,210 INFO L255 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 79 conjuncts are in the unsatisfiable core [2024-11-09 04:46:06,217 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:46:07,343 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 04:46:07,344 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:46:09,142 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:46:09,143 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 04:46:09,393 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 04:46:09,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266798912] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:46:09,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [691339746] [2024-11-09 04:46:09,397 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:46:09,397 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:46:09,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:46:09,397 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:46:09,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:46:09,955 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:46:11,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2831#true' at error location [2024-11-09 04:46:11,215 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:46:11,215 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:46:11,215 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 24, 25] total 69 [2024-11-09 04:46:11,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741186253] [2024-11-09 04:46:11,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:46:11,216 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2024-11-09 04:46:11,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:46:11,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2024-11-09 04:46:11,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=6155, Unknown=0, NotChecked=0, Total=6480 [2024-11-09 04:46:11,221 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 69 states, 69 states have (on average 2.1739130434782608) internal successors, (150), 69 states have internal predecessors, (150), 0 states have call successors, (0), 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 04:46:16,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:46:16,297 INFO L93 Difference]: Finished difference Result 169 states and 188 transitions. [2024-11-09 04:46:16,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2024-11-09 04:46:16,298 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.1739130434782608) internal successors, (150), 69 states have internal predecessors, (150), 0 states have call successors, (0), 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 04:46:16,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:46:16,299 INFO L225 Difference]: With dead ends: 169 [2024-11-09 04:46:16,299 INFO L226 Difference]: Without dead ends: 165 [2024-11-09 04:46:16,307 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 131 SyntacticMatches, 4 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3244 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=781, Invalid=12101, Unknown=0, NotChecked=0, Total=12882 [2024-11-09 04:46:16,308 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 89 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 3625 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 3738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 3625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2024-11-09 04:46:16,308 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 202 Invalid, 3738 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 3625 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2024-11-09 04:46:16,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2024-11-09 04:46:16,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 100. [2024-11-09 04:46:16,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.1313131313131313) internal successors, (112), 99 states have internal predecessors, (112), 0 states have call successors, (0), 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 04:46:16,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 112 transitions. [2024-11-09 04:46:16,329 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 112 transitions. Word has length 60 [2024-11-09 04:46:16,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:46:16,330 INFO L471 AbstractCegarLoop]: Abstraction has 100 states and 112 transitions. [2024-11-09 04:46:16,330 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 2.1739130434782608) internal successors, (150), 69 states have internal predecessors, (150), 0 states have call successors, (0), 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 04:46:16,330 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 112 transitions. [2024-11-09 04:46:16,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2024-11-09 04:46:16,331 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:46:16,331 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 04:46:16,353 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-09 04:46:16,532 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:46:16,532 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:46:16,533 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:46:16,533 INFO L85 PathProgramCache]: Analyzing trace with hash 1382240304, now seen corresponding path program 7 times [2024-11-09 04:46:16,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:46:16,533 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455172890] [2024-11-09 04:46:16,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:46:16,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:46:16,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:46:16,722 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 04:46:16,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:46:16,722 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455172890] [2024-11-09 04:46:16,722 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455172890] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:46:16,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743658323] [2024-11-09 04:46:16,723 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:46:16,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:46:16,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:46:16,725 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:46:16,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-09 04:46:16,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:46:16,833 INFO L255 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-09 04:46:16,835 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:46:16,943 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 04:46:16,943 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:46:17,036 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 04:46:17,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743658323] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:46:17,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1350894516] [2024-11-09 04:46:17,038 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:46:17,038 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:46:17,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:46:17,039 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:46:17,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:46:17,657 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:46:18,106 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3722#true' at error location [2024-11-09 04:46:18,106 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:46:18,106 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:46:18,106 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-09 04:46:18,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143783873] [2024-11-09 04:46:18,107 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:46:18,107 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 04:46:18,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:46:18,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 04:46:18,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=641, Unknown=0, NotChecked=0, Total=756 [2024-11-09 04:46:18,108 INFO L87 Difference]: Start difference. First operand 100 states and 112 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 04:46:18,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:46:18,328 INFO L93 Difference]: Finished difference Result 234 states and 262 transitions. [2024-11-09 04:46:18,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-09 04:46:18,329 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 04:46:18,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:46:18,329 INFO L225 Difference]: With dead ends: 234 [2024-11-09 04:46:18,330 INFO L226 Difference]: Without dead ends: 103 [2024-11-09 04:46:18,330 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 159 SyntacticMatches, 10 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=115, Invalid=641, Unknown=0, NotChecked=0, Total=756 [2024-11-09 04:46:18,331 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 35 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 04:46:18,331 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 41 Invalid, 345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 04:46:18,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2024-11-09 04:46:18,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2024-11-09 04:46:18,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 101 states have (on average 1.1287128712871286) internal successors, (114), 101 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 04:46:18,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 114 transitions. [2024-11-09 04:46:18,360 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 114 transitions. Word has length 62 [2024-11-09 04:46:18,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:46:18,360 INFO L471 AbstractCegarLoop]: Abstraction has 102 states and 114 transitions. [2024-11-09 04:46:18,361 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 04:46:18,361 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 114 transitions. [2024-11-09 04:46:18,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2024-11-09 04:46:18,362 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:46:18,362 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 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 04:46:18,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2024-11-09 04:46:18,562 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:46:18,563 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:46:18,563 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:46:18,563 INFO L85 PathProgramCache]: Analyzing trace with hash 1247844181, now seen corresponding path program 8 times [2024-11-09 04:46:18,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:46:18,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590840912] [2024-11-09 04:46:18,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:46:18,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:46:18,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:46:18,735 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2024-11-09 04:46:18,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:46:18,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590840912] [2024-11-09 04:46:18,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [590840912] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:46:18,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605299667] [2024-11-09 04:46:18,736 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:46:18,736 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:46:18,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:46:18,737 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:46:18,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-09 04:46:18,838 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-09 04:46:18,838 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:46:18,840 INFO L255 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-09 04:46:18,841 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:46:18,965 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2024-11-09 04:46:18,966 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:46:19,083 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2024-11-09 04:46:19,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605299667] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:46:19,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [395599098] [2024-11-09 04:46:19,085 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:46:19,086 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:46:19,086 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:46:19,086 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:46:19,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:46:19,627 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:46:20,039 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4611#true' at error location [2024-11-09 04:46:20,039 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:46:20,039 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:46:20,039 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-09 04:46:20,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059831505] [2024-11-09 04:46:20,039 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:46:20,040 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 04:46:20,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:46:20,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 04:46:20,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2024-11-09 04:46:20,041 INFO L87 Difference]: Start difference. First operand 102 states and 114 transitions. Second operand has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 0 states have call successors, (0), 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 04:46:20,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:46:20,250 INFO L93 Difference]: Finished difference Result 163 states and 185 transitions. [2024-11-09 04:46:20,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-09 04:46:20,251 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 0 states have call successors, (0), 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 64 [2024-11-09 04:46:20,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:46:20,251 INFO L225 Difference]: With dead ends: 163 [2024-11-09 04:46:20,252 INFO L226 Difference]: Without dead ends: 90 [2024-11-09 04:46:20,252 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 164 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2024-11-09 04:46:20,253 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 82 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 04:46:20,253 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 40 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 04:46:20,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2024-11-09 04:46:20,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 75. [2024-11-09 04:46:20,266 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 04:46:20,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2024-11-09 04:46:20,266 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 64 [2024-11-09 04:46:20,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:46:20,267 INFO L471 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2024-11-09 04:46:20,267 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 0 states have call successors, (0), 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 04:46:20,267 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2024-11-09 04:46:20,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2024-11-09 04:46:20,267 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:46:20,268 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 04:46:20,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2024-11-09 04:46:20,468 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-11-09 04:46:20,469 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:46:20,469 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:46:20,469 INFO L85 PathProgramCache]: Analyzing trace with hash -1846432402, now seen corresponding path program 9 times [2024-11-09 04:46:20,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:46:20,469 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182372826] [2024-11-09 04:46:20,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:46:20,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:46:20,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:46:26,656 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 04:46:26,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:46:26,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182372826] [2024-11-09 04:46:26,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182372826] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:46:26,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2091839649] [2024-11-09 04:46:26,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:46:26,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:46:26,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:46:26,659 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:46:26,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-09 04:46:26,760 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:46:26,760 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:46:26,763 INFO L255 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 105 conjuncts are in the unsatisfiable core [2024-11-09 04:46:26,767 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:46:28,229 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 04:46:28,230 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:46:31,035 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:46:31,036 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 04:46:31,490 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 04:46:31,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2091839649] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:46:31,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1845888017] [2024-11-09 04:46:31,492 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:46:31,492 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:46:31,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:46:31,492 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:46:31,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:46:31,935 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:46:33,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5368#true' at error location [2024-11-09 04:46:33,504 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:46:33,504 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:46:33,504 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 30, 31] total 86 [2024-11-09 04:46:33,504 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307041262] [2024-11-09 04:46:33,504 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:46:33,505 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2024-11-09 04:46:33,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:46:33,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2024-11-09 04:46:33,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=8939, Unknown=0, NotChecked=0, Total=9312 [2024-11-09 04:46:33,508 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 86 states, 86 states have (on average 2.13953488372093) internal successors, (184), 86 states have internal predecessors, (184), 0 states have call successors, (0), 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 04:46:41,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:46:41,101 INFO L93 Difference]: Finished difference Result 209 states and 229 transitions. [2024-11-09 04:46:41,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2024-11-09 04:46:41,101 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 2.13953488372093) internal successors, (184), 86 states have internal predecessors, (184), 0 states have call successors, (0), 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 04:46:41,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:46:41,103 INFO L225 Difference]: With dead ends: 209 [2024-11-09 04:46:41,103 INFO L226 Difference]: Without dead ends: 205 [2024-11-09 04:46:41,106 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 164 SyntacticMatches, 4 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4723 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=1027, Invalid=18995, Unknown=0, NotChecked=0, Total=20022 [2024-11-09 04:46:41,107 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 150 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 4824 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 4991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 4824 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2024-11-09 04:46:41,107 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 209 Invalid, 4991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 4824 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2024-11-09 04:46:41,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2024-11-09 04:46:41,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 134. [2024-11-09 04:46:41,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.112781954887218) internal successors, (148), 133 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 04:46:41,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 148 transitions. [2024-11-09 04:46:41,141 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 148 transitions. Word has length 74 [2024-11-09 04:46:41,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:46:41,142 INFO L471 AbstractCegarLoop]: Abstraction has 134 states and 148 transitions. [2024-11-09 04:46:41,142 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 2.13953488372093) internal successors, (184), 86 states have internal predecessors, (184), 0 states have call successors, (0), 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 04:46:41,142 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 148 transitions. [2024-11-09 04:46:41,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2024-11-09 04:46:41,143 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:46:41,143 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 04:46:41,160 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2024-11-09 04:46:41,347 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-11-09 04:46:41,347 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:46:41,347 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:46:41,347 INFO L85 PathProgramCache]: Analyzing trace with hash 743147987, now seen corresponding path program 10 times [2024-11-09 04:46:41,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:46:41,348 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638741934] [2024-11-09 04:46:41,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:46:41,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:46:41,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:46:41,554 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 04:46:41,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:46:41,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638741934] [2024-11-09 04:46:41,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638741934] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:46:41,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991423828] [2024-11-09 04:46:41,556 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:46:41,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:46:41,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:46:41,557 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:46:41,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-09 04:46:41,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:46:41,659 INFO L255 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-09 04:46:41,663 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:46:41,799 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 04:46:41,799 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:46:41,903 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 04:46:41,903 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991423828] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:46:41,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1017992646] [2024-11-09 04:46:41,905 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:46:41,905 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:46:41,905 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:46:41,906 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:46:41,906 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:46:42,374 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:46:42,939 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6493#true' at error location [2024-11-09 04:46:42,939 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:46:42,939 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:46:42,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-09 04:46:42,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567615884] [2024-11-09 04:46:42,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:46:42,940 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 04:46:42,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:46:42,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 04:46:42,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=789, Unknown=0, NotChecked=0, Total=930 [2024-11-09 04:46:42,941 INFO L87 Difference]: Start difference. First operand 134 states and 148 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 04:46:43,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:46:43,249 INFO L93 Difference]: Finished difference Result 276 states and 303 transitions. [2024-11-09 04:46:43,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-09 04:46:43,250 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 04:46:43,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:46:43,251 INFO L225 Difference]: With dead ends: 276 [2024-11-09 04:46:43,251 INFO L226 Difference]: Without dead ends: 125 [2024-11-09 04:46:43,252 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 198 SyntacticMatches, 12 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=141, Invalid=789, Unknown=0, NotChecked=0, Total=930 [2024-11-09 04:46:43,252 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 75 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 04:46:43,252 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 41 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 04:46:43,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2024-11-09 04:46:43,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2024-11-09 04:46:43,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.1056910569105691) internal successors, (136), 123 states have internal predecessors, (136), 0 states have call successors, (0), 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 04:46:43,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 136 transitions. [2024-11-09 04:46:43,275 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 136 transitions. Word has length 76 [2024-11-09 04:46:43,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:46:43,275 INFO L471 AbstractCegarLoop]: Abstraction has 124 states and 136 transitions. [2024-11-09 04:46:43,275 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 04:46:43,275 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 136 transitions. [2024-11-09 04:46:43,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2024-11-09 04:46:43,276 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:46:43,276 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 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 04:46:43,294 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2024-11-09 04:46:43,480 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-11-09 04:46:43,480 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:46:43,480 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:46:43,480 INFO L85 PathProgramCache]: Analyzing trace with hash -1128862664, now seen corresponding path program 11 times [2024-11-09 04:46:43,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:46:43,481 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310585803] [2024-11-09 04:46:43,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:46:43,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:46:43,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:46:43,686 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2024-11-09 04:46:43,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:46:43,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310585803] [2024-11-09 04:46:43,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310585803] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:46:43,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590067030] [2024-11-09 04:46:43,687 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:46:43,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:46:43,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:46:43,689 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:46:43,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-09 04:46:43,808 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-09 04:46:43,808 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:46:43,810 INFO L255 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-09 04:46:43,812 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:46:44,001 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2024-11-09 04:46:44,001 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:46:44,146 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2024-11-09 04:46:44,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590067030] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:46:44,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1340492771] [2024-11-09 04:46:44,149 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:46:44,149 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:46:44,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:46:44,149 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:46:44,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:46:44,556 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:46:44,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7565#true' at error location [2024-11-09 04:46:44,983 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:46:44,983 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:46:44,983 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-09 04:46:44,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817503810] [2024-11-09 04:46:44,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:46:44,984 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 04:46:44,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:46:44,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 04:46:44,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=778, Unknown=0, NotChecked=0, Total=930 [2024-11-09 04:46:44,985 INFO L87 Difference]: Start difference. First operand 124 states and 136 transitions. Second operand has 20 states, 20 states have (on average 4.55) internal successors, (91), 20 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 04:46:45,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:46:45,248 INFO L93 Difference]: Finished difference Result 195 states and 217 transitions. [2024-11-09 04:46:45,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-11-09 04:46:45,249 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.55) internal successors, (91), 20 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) Word has length 78 [2024-11-09 04:46:45,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:46:45,250 INFO L225 Difference]: With dead ends: 195 [2024-11-09 04:46:45,250 INFO L226 Difference]: Without dead ends: 106 [2024-11-09 04:46:45,250 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 203 SyntacticMatches, 13 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=172, Invalid=884, Unknown=0, NotChecked=0, Total=1056 [2024-11-09 04:46:45,251 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 83 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 04:46:45,252 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 51 Invalid, 363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 04:46:45,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2024-11-09 04:46:45,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 89. [2024-11-09 04:46:45,269 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 04:46:45,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2024-11-09 04:46:45,270 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 78 [2024-11-09 04:46:45,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:46:45,270 INFO L471 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2024-11-09 04:46:45,270 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.55) internal successors, (91), 20 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 04:46:45,270 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2024-11-09 04:46:45,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2024-11-09 04:46:45,271 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:46:45,271 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 04:46:45,285 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2024-11-09 04:46:45,471 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2024-11-09 04:46:45,472 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:46:45,472 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:46:45,472 INFO L85 PathProgramCache]: Analyzing trace with hash -1160652143, now seen corresponding path program 12 times [2024-11-09 04:46:45,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:46:45,472 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145222215] [2024-11-09 04:46:45,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:46:45,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:46:45,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:46:52,920 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 04:46:52,920 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:46:52,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145222215] [2024-11-09 04:46:52,921 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145222215] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:46:52,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069946176] [2024-11-09 04:46:52,921 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:46:52,921 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:46:52,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:46:52,923 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:46:52,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-09 04:46:53,029 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:46:53,029 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:46:53,032 INFO L255 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 135 conjuncts are in the unsatisfiable core [2024-11-09 04:46:53,039 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:46:55,476 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 04:46:55,476 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:47:00,190 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:47:00,190 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 04:47:01,825 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 04:47:01,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069946176] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:47:01,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1899374284] [2024-11-09 04:47:01,827 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:47:01,828 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:47:01,828 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:47:01,828 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:47:01,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:47:02,274 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:47:04,352 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8478#true' at error location [2024-11-09 04:47:04,352 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:47:04,352 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:47:04,352 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 39, 37] total 107 [2024-11-09 04:47:04,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443043770] [2024-11-09 04:47:04,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:47:04,353 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2024-11-09 04:47:04,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:47:04,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2024-11-09 04:47:04,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=13364, Unknown=0, NotChecked=0, Total=13806 [2024-11-09 04:47:04,356 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand has 107 states, 107 states have (on average 2.1121495327102804) internal successors, (226), 107 states have internal predecessors, (226), 0 states have call successors, (0), 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 04:47:16,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:47:16,668 INFO L93 Difference]: Finished difference Result 217 states and 236 transitions. [2024-11-09 04:47:16,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2024-11-09 04:47:16,668 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 2.1121495327102804) internal successors, (226), 107 states have internal predecessors, (226), 0 states have call successors, (0), 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 04:47:16,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:47:16,670 INFO L225 Difference]: With dead ends: 217 [2024-11-09 04:47:16,670 INFO L226 Difference]: Without dead ends: 213 [2024-11-09 04:47:16,672 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 192 SyntacticMatches, 4 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6861 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=1435, Invalid=28667, Unknown=0, NotChecked=0, Total=30102 [2024-11-09 04:47:16,673 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 204 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 8074 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 8318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 8074 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2024-11-09 04:47:16,673 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 287 Invalid, 8318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 8074 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2024-11-09 04:47:16,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2024-11-09 04:47:16,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 130. [2024-11-09 04:47:16,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 0 states have call successors, (0), 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 04:47:16,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 140 transitions. [2024-11-09 04:47:16,709 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 140 transitions. Word has length 88 [2024-11-09 04:47:16,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:47:16,709 INFO L471 AbstractCegarLoop]: Abstraction has 130 states and 140 transitions. [2024-11-09 04:47:16,709 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 2.1121495327102804) internal successors, (226), 107 states have internal predecessors, (226), 0 states have call successors, (0), 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 04:47:16,710 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 140 transitions. [2024-11-09 04:47:16,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2024-11-09 04:47:16,710 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:47:16,710 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 04:47:16,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-11-09 04:47:16,910 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:47:16,911 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:47:16,911 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:47:16,911 INFO L85 PathProgramCache]: Analyzing trace with hash -109712842, now seen corresponding path program 13 times [2024-11-09 04:47:16,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:47:16,911 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421953243] [2024-11-09 04:47:16,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:47:16,912 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:47:16,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:47:17,171 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 04:47:17,171 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:47:17,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421953243] [2024-11-09 04:47:17,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421953243] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:47:17,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188285502] [2024-11-09 04:47:17,172 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:47:17,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:47:17,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:47:17,174 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:47:17,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-09 04:47:17,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:47:17,290 INFO L255 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-09 04:47:17,292 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:47:17,458 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 04:47:17,458 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:47:17,577 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 04:47:17,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188285502] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:47:17,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [27502040] [2024-11-09 04:47:17,578 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:47:17,578 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:47:17,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:47:17,579 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:47:17,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:47:18,012 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:47:18,505 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9737#true' at error location [2024-11-09 04:47:18,505 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:47:18,505 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:47:18,505 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2024-11-09 04:47:18,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516262472] [2024-11-09 04:47:18,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:47:18,506 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-09 04:47:18,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:47:18,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-09 04:47:18,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=951, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 04:47:18,507 INFO L87 Difference]: Start difference. First operand 130 states and 140 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 04:47:18,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:47:18,930 INFO L93 Difference]: Finished difference Result 312 states and 337 transitions. [2024-11-09 04:47:18,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-11-09 04:47:18,930 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 04:47:18,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:47:18,931 INFO L225 Difference]: With dead ends: 312 [2024-11-09 04:47:18,931 INFO L226 Difference]: Without dead ends: 133 [2024-11-09 04:47:18,931 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=951, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 04:47:18,932 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 53 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 695 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 695 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 04:47:18,932 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 74 Invalid, 750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 695 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 04:47:18,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2024-11-09 04:47:18,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2024-11-09 04:47:18,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.083969465648855) internal successors, (142), 131 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 04:47:18,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 142 transitions. [2024-11-09 04:47:18,966 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 142 transitions. Word has length 90 [2024-11-09 04:47:18,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:47:18,966 INFO L471 AbstractCegarLoop]: Abstraction has 132 states and 142 transitions. [2024-11-09 04:47:18,966 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 04:47:18,966 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 142 transitions. [2024-11-09 04:47:18,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2024-11-09 04:47:18,967 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:47:18,967 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 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 04:47:18,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2024-11-09 04:47:19,167 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-09 04:47:19,168 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:47:19,168 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:47:19,168 INFO L85 PathProgramCache]: Analyzing trace with hash 1692317659, now seen corresponding path program 14 times [2024-11-09 04:47:19,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:47:19,168 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952067826] [2024-11-09 04:47:19,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:47:19,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:47:19,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:47:19,427 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-09 04:47:19,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:47:19,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952067826] [2024-11-09 04:47:19,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [952067826] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:47:19,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107696927] [2024-11-09 04:47:19,428 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:47:19,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:47:19,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:47:19,430 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:47:19,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-09 04:47:19,578 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-09 04:47:19,578 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:47:19,581 INFO L255 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-09 04:47:19,582 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:47:19,854 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-09 04:47:19,854 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:47:20,068 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2024-11-09 04:47:20,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107696927] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:47:20,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1713250736] [2024-11-09 04:47:20,072 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:47:20,072 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:47:20,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:47:20,072 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:47:20,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:47:20,426 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:47:20,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10962#true' at error location [2024-11-09 04:47:20,876 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:47:20,876 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:47:20,877 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2024-11-09 04:47:20,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337918859] [2024-11-09 04:47:20,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:47:20,877 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-11-09 04:47:20,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:47:20,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-11-09 04:47:20,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1288, Unknown=0, NotChecked=0, Total=1482 [2024-11-09 04:47:20,878 INFO L87 Difference]: Start difference. First operand 132 states and 142 transitions. Second operand has 28 states, 28 states have (on average 3.7142857142857144) internal successors, (104), 28 states have internal predecessors, (104), 0 states have call successors, (0), 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 04:47:21,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:47:21,458 INFO L93 Difference]: Finished difference Result 214 states and 234 transitions. [2024-11-09 04:47:21,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2024-11-09 04:47:21,459 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.7142857142857144) internal successors, (104), 28 states have internal predecessors, (104), 0 states have call successors, (0), 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 92 [2024-11-09 04:47:21,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:47:21,460 INFO L225 Difference]: With dead ends: 214 [2024-11-09 04:47:21,460 INFO L226 Difference]: Without dead ends: 109 [2024-11-09 04:47:21,460 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 244 SyntacticMatches, 15 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 963 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=308, Invalid=1854, Unknown=0, NotChecked=0, Total=2162 [2024-11-09 04:47:21,461 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 206 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 776 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 952 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 776 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 04:47:21,461 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 52 Invalid, 952 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 776 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 04:47:21,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2024-11-09 04:47:21,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 103. [2024-11-09 04:47:21,483 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 04:47:21,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 109 transitions. [2024-11-09 04:47:21,484 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 109 transitions. Word has length 92 [2024-11-09 04:47:21,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:47:21,484 INFO L471 AbstractCegarLoop]: Abstraction has 103 states and 109 transitions. [2024-11-09 04:47:21,484 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.7142857142857144) internal successors, (104), 28 states have internal predecessors, (104), 0 states have call successors, (0), 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 04:47:21,484 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 109 transitions. [2024-11-09 04:47:21,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2024-11-09 04:47:21,485 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:47:21,485 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 04:47:21,502 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2024-11-09 04:47:21,686 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-09 04:47:21,686 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:47:21,686 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:47:21,687 INFO L85 PathProgramCache]: Analyzing trace with hash 1938558580, now seen corresponding path program 15 times [2024-11-09 04:47:21,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:47:21,687 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085464436] [2024-11-09 04:47:21,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:47:21,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:47:21,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:47:31,870 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 12 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 04:47:31,870 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:47:31,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085464436] [2024-11-09 04:47:31,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1085464436] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:47:31,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945284829] [2024-11-09 04:47:31,871 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:47:31,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:47:31,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:47:31,872 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:47:31,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-09 04:47:31,988 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:47:31,988 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:47:31,991 INFO L255 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 163 conjuncts are in the unsatisfiable core [2024-11-09 04:47:31,994 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:47:35,541 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 248 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 04:47:35,541 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:47:43,597 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:47:43,598 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 04:47:48,120 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 04:47:48,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945284829] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:47:48,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1506875863] [2024-11-09 04:47:48,122 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:47:48,122 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:47:48,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:47:48,122 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:47:48,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:47:48,508 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:47:50,800 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12035#true' at error location [2024-11-09 04:47:50,800 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:47:50,800 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:47:50,800 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 46, 43] total 125 [2024-11-09 04:47:50,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998977858] [2024-11-09 04:47:50,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:47:50,801 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2024-11-09 04:47:50,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:47:50,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2024-11-09 04:47:50,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=17828, Unknown=0, NotChecked=0, Total=18360 [2024-11-09 04:47:50,803 INFO L87 Difference]: Start difference. First operand 103 states and 109 transitions. Second operand has 125 states, 125 states have (on average 2.096) internal successors, (262), 125 states have internal predecessors, (262), 0 states have call successors, (0), 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 04:48:06,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:48:06,783 INFO L93 Difference]: Finished difference Result 248 states and 267 transitions. [2024-11-09 04:48:06,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2024-11-09 04:48:06,784 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 2.096) internal successors, (262), 125 states have internal predecessors, (262), 0 states have call successors, (0), 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 04:48:06,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:48:06,785 INFO L225 Difference]: With dead ends: 248 [2024-11-09 04:48:06,785 INFO L226 Difference]: Without dead ends: 244 [2024-11-09 04:48:06,788 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 223 SyntacticMatches, 4 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8746 ImplicationChecksByTransitivity, 23.1s TimeCoverageRelationStatistics Valid=1603, Invalid=35453, Unknown=0, NotChecked=0, Total=37056 [2024-11-09 04:48:06,788 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 193 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 10181 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 10423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 10181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2024-11-09 04:48:06,789 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [193 Valid, 316 Invalid, 10423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 10181 Invalid, 0 Unknown, 0 Unchecked, 7.5s Time] [2024-11-09 04:48:06,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2024-11-09 04:48:06,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 150. [2024-11-09 04:48:06,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.0738255033557047) internal successors, (160), 149 states have internal predecessors, (160), 0 states have call successors, (0), 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 04:48:06,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 160 transitions. [2024-11-09 04:48:06,838 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 160 transitions. Word has length 102 [2024-11-09 04:48:06,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:48:06,838 INFO L471 AbstractCegarLoop]: Abstraction has 150 states and 160 transitions. [2024-11-09 04:48:06,838 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 2.096) internal successors, (262), 125 states have internal predecessors, (262), 0 states have call successors, (0), 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 04:48:06,838 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 160 transitions. [2024-11-09 04:48:06,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2024-11-09 04:48:06,839 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:48:06,840 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 04:48:06,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2024-11-09 04:48:07,040 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-09 04:48:07,040 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:48:07,041 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:48:07,041 INFO L85 PathProgramCache]: Analyzing trace with hash 1100980569, now seen corresponding path program 16 times [2024-11-09 04:48:07,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:48:07,041 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738687118] [2024-11-09 04:48:07,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:48:07,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:48:07,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:48:07,319 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 04:48:07,319 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:48:07,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738687118] [2024-11-09 04:48:07,319 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738687118] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:48:07,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040141037] [2024-11-09 04:48:07,319 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:48:07,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:48:07,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:48:07,321 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:48:07,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-09 04:48:07,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:48:07,436 INFO L255 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-09 04:48:07,437 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:48:07,628 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 04:48:07,628 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:48:07,783 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 04:48:07,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1040141037] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:48:07,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [436433634] [2024-11-09 04:48:07,785 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:48:07,785 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:48:07,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:48:07,785 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:48:07,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:48:08,148 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:48:08,667 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13475#true' at error location [2024-11-09 04:48:08,667 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:48:08,667 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:48:08,667 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2024-11-09 04:48:08,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537050064] [2024-11-09 04:48:08,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:48:08,668 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-09 04:48:08,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:48:08,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-09 04:48:08,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1127, Unknown=0, NotChecked=0, Total=1332 [2024-11-09 04:48:08,669 INFO L87 Difference]: Start difference. First operand 150 states and 160 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 04:48:09,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:48:09,106 INFO L93 Difference]: Finished difference Result 360 states and 385 transitions. [2024-11-09 04:48:09,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-09 04:48:09,107 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 04:48:09,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:48:09,108 INFO L225 Difference]: With dead ends: 360 [2024-11-09 04:48:09,108 INFO L226 Difference]: Without dead ends: 153 [2024-11-09 04:48:09,109 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 276 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=205, Invalid=1127, Unknown=0, NotChecked=0, Total=1332 [2024-11-09 04:48:09,109 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 58 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 04:48:09,109 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 41 Invalid, 627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 562 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 04:48:09,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2024-11-09 04:48:09,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2024-11-09 04:48:09,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.0728476821192052) internal successors, (162), 151 states have internal predecessors, (162), 0 states have call successors, (0), 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 04:48:09,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 162 transitions. [2024-11-09 04:48:09,158 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 162 transitions. Word has length 104 [2024-11-09 04:48:09,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:48:09,158 INFO L471 AbstractCegarLoop]: Abstraction has 152 states and 162 transitions. [2024-11-09 04:48:09,158 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 04:48:09,158 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 162 transitions. [2024-11-09 04:48:09,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2024-11-09 04:48:09,159 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:48:09,159 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 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 04:48:09,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2024-11-09 04:48:09,360 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-09 04:48:09,360 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:48:09,360 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:48:09,360 INFO L85 PathProgramCache]: Analyzing trace with hash 898181694, now seen corresponding path program 17 times [2024-11-09 04:48:09,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:48:09,360 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016810733] [2024-11-09 04:48:09,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:48:09,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:48:09,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:48:09,647 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 25 proven. 60 refuted. 0 times theorem prover too weak. 193 trivial. 0 not checked. [2024-11-09 04:48:09,648 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:48:09,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016810733] [2024-11-09 04:48:09,648 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016810733] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:48:09,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870356696] [2024-11-09 04:48:09,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:48:09,648 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:48:09,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:48:09,649 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:48:09,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-09 04:48:09,823 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2024-11-09 04:48:09,824 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:48:09,826 INFO L255 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-09 04:48:09,829 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:48:10,102 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 42 proven. 43 refuted. 0 times theorem prover too weak. 193 trivial. 0 not checked. [2024-11-09 04:48:10,102 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:48:10,311 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 42 proven. 43 refuted. 0 times theorem prover too weak. 193 trivial. 0 not checked. [2024-11-09 04:48:10,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870356696] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:48:10,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [952599839] [2024-11-09 04:48:10,313 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:48:10,313 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:48:10,313 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:48:10,313 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:48:10,313 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:48:10,656 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:48:11,257 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14889#true' at error location [2024-11-09 04:48:11,257 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:48:11,257 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:48:11,258 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2024-11-09 04:48:11,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897576528] [2024-11-09 04:48:11,258 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:48:11,258 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-09 04:48:11,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:48:11,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-09 04:48:11,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=1571, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 04:48:11,260 INFO L87 Difference]: Start difference. First operand 152 states and 162 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 04:48:11,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:48:11,948 INFO L93 Difference]: Finished difference Result 244 states and 264 transitions. [2024-11-09 04:48:11,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-09 04:48:11,948 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 106 [2024-11-09 04:48:11,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:48:11,950 INFO L225 Difference]: With dead ends: 244 [2024-11-09 04:48:11,950 INFO L226 Difference]: Without dead ends: 123 [2024-11-09 04:48:11,950 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 283 SyntacticMatches, 17 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1241 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=377, Invalid=2275, Unknown=0, NotChecked=0, Total=2652 [2024-11-09 04:48:11,951 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 232 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 911 mSolverCounterSat, 233 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 1144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 233 IncrementalHoareTripleChecker+Valid, 911 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 04:48:11,951 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 54 Invalid, 1144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [233 Valid, 911 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 04:48:11,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2024-11-09 04:48:11,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2024-11-09 04:48:11,992 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 04:48:11,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 123 transitions. [2024-11-09 04:48:11,993 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 123 transitions. Word has length 106 [2024-11-09 04:48:11,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:48:11,993 INFO L471 AbstractCegarLoop]: Abstraction has 117 states and 123 transitions. [2024-11-09 04:48:11,993 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 04:48:11,993 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 123 transitions. [2024-11-09 04:48:11,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2024-11-09 04:48:11,994 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:48:11,994 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 04:48:12,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2024-11-09 04:48:12,194 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:48:12,195 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:48:12,195 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:48:12,195 INFO L85 PathProgramCache]: Analyzing trace with hash -308971241, now seen corresponding path program 18 times [2024-11-09 04:48:12,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:48:12,195 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253358957] [2024-11-09 04:48:12,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:48:12,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:48:12,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:48:24,279 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 30 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 04:48:24,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:48:24,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253358957] [2024-11-09 04:48:24,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [253358957] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:48:24,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159389478] [2024-11-09 04:48:24,279 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:48:24,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:48:24,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:48:24,281 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:48:24,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-09 04:48:24,411 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:48:24,411 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:48:24,414 INFO L255 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 187 conjuncts are in the unsatisfiable core [2024-11-09 04:48:24,417 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:48:27,677 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 0 proven. 339 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 04:48:27,677 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:48:37,110 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:48:37,110 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 04:48:41,835 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 04:48:41,835 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [159389478] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:48:41,835 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [997717606] [2024-11-09 04:48:41,836 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:48:41,837 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:48:41,837 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:48:41,837 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:48:41,837 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:48:42,267 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:48:44,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16119#true' at error location [2024-11-09 04:48:44,771 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:48:44,771 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:48:44,771 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 53, 49] total 132 [2024-11-09 04:48:44,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756512228] [2024-11-09 04:48:44,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:48:44,772 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2024-11-09 04:48:44,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:48:44,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2024-11-09 04:48:44,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=559, Invalid=19747, Unknown=0, NotChecked=0, Total=20306 [2024-11-09 04:48:44,774 INFO L87 Difference]: Start difference. First operand 117 states and 123 transitions. Second operand has 132 states, 132 states have (on average 2.0833333333333335) internal successors, (275), 132 states have internal predecessors, (275), 0 states have call successors, (0), 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 04:49:05,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:49:05,519 INFO L93 Difference]: Finished difference Result 281 states and 300 transitions. [2024-11-09 04:49:05,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2024-11-09 04:49:05,520 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 2.0833333333333335) internal successors, (275), 132 states have internal predecessors, (275), 0 states have call successors, (0), 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 04:49:05,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:49:05,522 INFO L225 Difference]: With dead ends: 281 [2024-11-09 04:49:05,522 INFO L226 Difference]: Without dead ends: 277 [2024-11-09 04:49:05,524 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 265 SyntacticMatches, 4 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9258 ImplicationChecksByTransitivity, 27.2s TimeCoverageRelationStatistics Valid=1748, Invalid=40072, Unknown=0, NotChecked=0, Total=41820 [2024-11-09 04:49:05,525 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 204 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 12580 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 12840 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 12580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2024-11-09 04:49:05,525 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 342 Invalid, 12840 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [260 Valid, 12580 Invalid, 0 Unknown, 0 Unchecked, 9.8s Time] [2024-11-09 04:49:05,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2024-11-09 04:49:05,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 170. [2024-11-09 04:49:05,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.0650887573964498) internal successors, (180), 169 states have internal predecessors, (180), 0 states have call successors, (0), 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 04:49:05,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 180 transitions. [2024-11-09 04:49:05,587 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 180 transitions. Word has length 116 [2024-11-09 04:49:05,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:49:05,587 INFO L471 AbstractCegarLoop]: Abstraction has 170 states and 180 transitions. [2024-11-09 04:49:05,587 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 2.0833333333333335) internal successors, (275), 132 states have internal predecessors, (275), 0 states have call successors, (0), 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 04:49:05,587 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 180 transitions. [2024-11-09 04:49:05,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2024-11-09 04:49:05,589 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:49:05,589 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 04:49:05,610 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2024-11-09 04:49:05,789 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:49:05,790 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:49:05,790 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:49:05,790 INFO L85 PathProgramCache]: Analyzing trace with hash -474882244, now seen corresponding path program 19 times [2024-11-09 04:49:05,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:49:05,790 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942452548] [2024-11-09 04:49:05,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:49:05,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:49:05,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:49:06,124 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 04:49:06,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:49:06,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942452548] [2024-11-09 04:49:06,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942452548] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:49:06,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802200387] [2024-11-09 04:49:06,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:49:06,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:49:06,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:49:06,126 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:49:06,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-09 04:49:06,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:49:06,261 INFO L255 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-09 04:49:06,262 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:49:06,487 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 04:49:06,487 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:49:06,662 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 04:49:06,662 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802200387] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:49:06,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [197690472] [2024-11-09 04:49:06,663 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:49:06,664 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:49:06,664 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:49:06,664 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:49:06,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:49:07,091 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:49:07,646 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17740#true' at error location [2024-11-09 04:49:07,646 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:49:07,646 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:49:07,646 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-09 04:49:07,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915558446] [2024-11-09 04:49:07,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:49:07,647 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-09 04:49:07,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:49:07,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-09 04:49:07,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=1317, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 04:49:07,648 INFO L87 Difference]: Start difference. First operand 170 states and 180 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 04:49:08,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:49:08,213 INFO L93 Difference]: Finished difference Result 408 states and 433 transitions. [2024-11-09 04:49:08,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-09 04:49:08,214 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 04:49:08,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:49:08,215 INFO L225 Difference]: With dead ends: 408 [2024-11-09 04:49:08,215 INFO L226 Difference]: Without dead ends: 173 [2024-11-09 04:49:08,216 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 315 SyntacticMatches, 18 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=243, Invalid=1317, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 04:49:08,217 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 78 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 725 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 725 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 04:49:08,217 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 59 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 725 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 04:49:08,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2024-11-09 04:49:08,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2024-11-09 04:49:08,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 171 states have (on average 1.064327485380117) internal successors, (182), 171 states have internal predecessors, (182), 0 states have call successors, (0), 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 04:49:08,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 182 transitions. [2024-11-09 04:49:08,288 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 182 transitions. Word has length 118 [2024-11-09 04:49:08,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:49:08,288 INFO L471 AbstractCegarLoop]: Abstraction has 172 states and 182 transitions. [2024-11-09 04:49:08,288 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 04:49:08,288 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 182 transitions. [2024-11-09 04:49:08,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2024-11-09 04:49:08,290 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:49:08,290 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 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 04:49:08,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2024-11-09 04:49:08,490 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:49:08,490 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:49:08,491 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:49:08,491 INFO L85 PathProgramCache]: Analyzing trace with hash 1033073505, now seen corresponding path program 20 times [2024-11-09 04:49:08,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:49:08,491 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814418888] [2024-11-09 04:49:08,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:49:08,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:49:08,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:49:08,777 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2024-11-09 04:49:08,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:49:08,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814418888] [2024-11-09 04:49:08,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [814418888] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:49:08,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079707343] [2024-11-09 04:49:08,778 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:49:08,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:49:08,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:49:08,779 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:49:08,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-09 04:49:08,988 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2024-11-09 04:49:08,988 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:49:08,990 INFO L255 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-09 04:49:08,992 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:49:09,218 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 56 proven. 57 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2024-11-09 04:49:09,218 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:49:09,452 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 56 proven. 57 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2024-11-09 04:49:09,452 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079707343] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:49:09,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [938156207] [2024-11-09 04:49:09,454 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:49:09,454 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:49:09,454 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:49:09,454 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:49:09,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:49:09,873 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:49:10,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19343#true' at error location [2024-11-09 04:49:10,387 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:49:10,388 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:49:10,388 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-09 04:49:10,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115904483] [2024-11-09 04:49:10,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:49:10,389 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-09 04:49:10,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:49:10,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-09 04:49:10,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1303, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 04:49:10,390 INFO L87 Difference]: Start difference. First operand 172 states and 182 transitions. Second operand has 29 states, 29 states have (on average 3.689655172413793) internal successors, (107), 29 states have internal predecessors, (107), 0 states have call successors, (0), 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 04:49:10,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:49:10,824 INFO L93 Difference]: Finished difference Result 274 states and 294 transitions. [2024-11-09 04:49:10,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-09 04:49:10,825 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.689655172413793) internal successors, (107), 29 states have internal predecessors, (107), 0 states have call successors, (0), 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 120 [2024-11-09 04:49:10,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:49:10,826 INFO L225 Difference]: With dead ends: 274 [2024-11-09 04:49:10,826 INFO L226 Difference]: Without dead ends: 137 [2024-11-09 04:49:10,827 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 320 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 955 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=283, Invalid=1439, Unknown=0, NotChecked=0, Total=1722 [2024-11-09 04:49:10,827 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 127 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 466 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 570 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 04:49:10,827 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 65 Invalid, 570 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 466 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 04:49:10,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2024-11-09 04:49:10,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 131. [2024-11-09 04:49:10,875 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 04:49:10,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 137 transitions. [2024-11-09 04:49:10,876 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 137 transitions. Word has length 120 [2024-11-09 04:49:10,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:49:10,876 INFO L471 AbstractCegarLoop]: Abstraction has 131 states and 137 transitions. [2024-11-09 04:49:10,876 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.689655172413793) internal successors, (107), 29 states have internal predecessors, (107), 0 states have call successors, (0), 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 04:49:10,877 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 137 transitions. [2024-11-09 04:49:10,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2024-11-09 04:49:10,877 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:49:10,878 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 04:49:10,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2024-11-09 04:49:11,078 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:49:11,078 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:49:11,078 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:49:11,079 INFO L85 PathProgramCache]: Analyzing trace with hash -1886434694, now seen corresponding path program 21 times [2024-11-09 04:49:11,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:49:11,079 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073277671] [2024-11-09 04:49:11,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:49:11,079 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:49:11,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:49:26,222 INFO L134 CoverageAnalysis]: Checked inductivity of 448 backedges. 43 proven. 405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 04:49:26,222 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:49:26,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073277671] [2024-11-09 04:49:26,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073277671] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:49:26,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1127310029] [2024-11-09 04:49:26,222 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:49:26,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:49:26,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:49:26,223 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:49:26,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-09 04:49:26,376 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:49:26,376 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:49:26,381 INFO L255 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 215 conjuncts are in the unsatisfiable core [2024-11-09 04:49:26,387 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:49:30,706 INFO L134 CoverageAnalysis]: Checked inductivity of 448 backedges. 0 proven. 444 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 04:49:30,706 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:49:44,285 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:49:44,285 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 589 [2024-11-09 04:49:58,476 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 04:49:58,476 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1127310029] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:49:58,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2136959770] [2024-11-09 04:49:58,477 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:49:58,477 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:49:58,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:49:58,478 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:49:58,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:49:58,819 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:50:01,781 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20698#true' at error location [2024-11-09 04:50:01,781 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:50:01,781 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:50:01,781 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 60, 55] total 148 [2024-11-09 04:50:01,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605494755] [2024-11-09 04:50:01,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:50:01,782 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2024-11-09 04:50:01,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:50:01,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2024-11-09 04:50:01,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=24813, Unknown=0, NotChecked=0, Total=25440 [2024-11-09 04:50:01,786 INFO L87 Difference]: Start difference. First operand 131 states and 137 transitions. Second operand has 148 states, 148 states have (on average 2.074324324324324) internal successors, (307), 148 states have internal predecessors, (307), 0 states have call successors, (0), 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 04:50:26,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:50:26,953 INFO L93 Difference]: Finished difference Result 313 states and 332 transitions. [2024-11-09 04:50:26,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2024-11-09 04:50:26,954 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 2.074324324324324) internal successors, (307), 148 states have internal predecessors, (307), 0 states have call successors, (0), 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 04:50:26,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:50:26,955 INFO L225 Difference]: With dead ends: 313 [2024-11-09 04:50:26,955 INFO L226 Difference]: Without dead ends: 309 [2024-11-09 04:50:26,957 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 297 SyntacticMatches, 4 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11734 ImplicationChecksByTransitivity, 35.3s TimeCoverageRelationStatistics Valid=2072, Invalid=50140, Unknown=0, NotChecked=0, Total=52212 [2024-11-09 04:50:26,957 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 251 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 14595 mSolverCounterSat, 299 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 14894 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 299 IncrementalHoareTripleChecker+Valid, 14595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.8s IncrementalHoareTripleChecker+Time [2024-11-09 04:50:26,958 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [251 Valid, 345 Invalid, 14894 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [299 Valid, 14595 Invalid, 0 Unknown, 0 Unchecked, 11.8s Time] [2024-11-09 04:50:26,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2024-11-09 04:50:27,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 190. [2024-11-09 04:50:27,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.0582010582010581) internal successors, (200), 189 states have internal predecessors, (200), 0 states have call successors, (0), 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 04:50:27,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 200 transitions. [2024-11-09 04:50:27,036 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 200 transitions. Word has length 130 [2024-11-09 04:50:27,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:50:27,036 INFO L471 AbstractCegarLoop]: Abstraction has 190 states and 200 transitions. [2024-11-09 04:50:27,037 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 2.074324324324324) internal successors, (307), 148 states have internal predecessors, (307), 0 states have call successors, (0), 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 04:50:27,037 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 200 transitions. [2024-11-09 04:50:27,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2024-11-09 04:50:27,038 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:50:27,038 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 04:50:27,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2024-11-09 04:50:27,238 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:50:27,239 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:50:27,239 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:50:27,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1732127777, now seen corresponding path program 22 times [2024-11-09 04:50:27,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:50:27,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441929454] [2024-11-09 04:50:27,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:50:27,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:50:27,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:50:27,700 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 04:50:27,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:50:27,700 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441929454] [2024-11-09 04:50:27,700 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441929454] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:50:27,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709032081] [2024-11-09 04:50:27,701 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:50:27,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:50:27,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:50:27,703 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:50:27,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-09 04:50:27,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:50:27,851 INFO L255 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-09 04:50:27,853 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:50:28,121 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 04:50:28,121 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:50:28,324 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 04:50:28,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709032081] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:50:28,325 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2038612284] [2024-11-09 04:50:28,326 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:50:28,326 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:50:28,326 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:50:28,326 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:50:28,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:50:28,687 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:50:29,278 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22513#true' at error location [2024-11-09 04:50:29,278 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:50:29,278 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:50:29,278 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2024-11-09 04:50:29,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059146641] [2024-11-09 04:50:29,279 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:50:29,279 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-09 04:50:29,279 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:50:29,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-09 04:50:29,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=1521, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 04:50:29,280 INFO L87 Difference]: Start difference. First operand 190 states and 200 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 04:50:29,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:50:29,954 INFO L93 Difference]: Finished difference Result 456 states and 481 transitions. [2024-11-09 04:50:29,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-09 04:50:29,955 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 04:50:29,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:50:29,956 INFO L225 Difference]: With dead ends: 456 [2024-11-09 04:50:29,956 INFO L226 Difference]: Without dead ends: 193 [2024-11-09 04:50:29,957 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 354 SyntacticMatches, 20 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 940 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=285, Invalid=1521, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 04:50:29,957 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 75 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 910 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 1005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 910 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 04:50:29,957 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 65 Invalid, 1005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 910 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 04:50:29,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2024-11-09 04:50:30,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2024-11-09 04:50:30,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 191 states have (on average 1.057591623036649) internal successors, (202), 191 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 04:50:30,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 202 transitions. [2024-11-09 04:50:30,037 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 202 transitions. Word has length 132 [2024-11-09 04:50:30,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:50:30,037 INFO L471 AbstractCegarLoop]: Abstraction has 192 states and 202 transitions. [2024-11-09 04:50:30,037 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 04:50:30,038 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 202 transitions. [2024-11-09 04:50:30,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2024-11-09 04:50:30,038 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:50:30,039 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 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 04:50:30,059 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-09 04:50:30,239 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:50:30,239 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:50:30,240 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:50:30,240 INFO L85 PathProgramCache]: Analyzing trace with hash 1795605316, now seen corresponding path program 23 times [2024-11-09 04:50:30,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:50:30,240 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382716720] [2024-11-09 04:50:30,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:50:30,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:50:30,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:50:30,628 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 49 proven. 96 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2024-11-09 04:50:30,629 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:50:30,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382716720] [2024-11-09 04:50:30,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382716720] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:50:30,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692538461] [2024-11-09 04:50:30,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:50:30,629 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:50:30,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:50:30,632 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:50:30,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-09 04:50:30,911 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2024-11-09 04:50:30,912 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:50:30,915 INFO L255 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-09 04:50:30,916 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:50:31,279 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 72 proven. 73 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2024-11-09 04:50:31,280 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:50:31,568 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 72 proven. 73 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2024-11-09 04:50:31,568 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [692538461] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:50:31,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2035041330] [2024-11-09 04:50:31,569 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:50:31,569 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:50:31,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:50:31,570 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:50:31,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:50:32,040 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:50:32,644 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24305#true' at error location [2024-11-09 04:50:32,644 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:50:32,644 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:50:32,644 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2024-11-09 04:50:32,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196763676] [2024-11-09 04:50:32,645 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:50:32,645 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2024-11-09 04:50:32,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:50:32,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2024-11-09 04:50:32,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=2111, Unknown=0, NotChecked=0, Total=2450 [2024-11-09 04:50:32,646 INFO L87 Difference]: Start difference. First operand 192 states and 202 transitions. Second operand has 40 states, 40 states have (on average 3.15) internal successors, (126), 40 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 04:50:33,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:50:33,715 INFO L93 Difference]: Finished difference Result 304 states and 324 transitions. [2024-11-09 04:50:33,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-09 04:50:33,716 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.15) internal successors, (126), 40 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 134 [2024-11-09 04:50:33,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:50:33,717 INFO L225 Difference]: With dead ends: 304 [2024-11-09 04:50:33,717 INFO L226 Difference]: Without dead ends: 151 [2024-11-09 04:50:33,718 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 362 SyntacticMatches, 21 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1847 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=566, Invalid=3094, Unknown=0, NotChecked=0, Total=3660 [2024-11-09 04:50:33,718 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 285 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 1311 mSolverCounterSat, 281 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 1592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 281 IncrementalHoareTripleChecker+Valid, 1311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 04:50:33,719 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [285 Valid, 57 Invalid, 1592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [281 Valid, 1311 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 04:50:33,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2024-11-09 04:50:33,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2024-11-09 04:50:33,779 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 04:50:33,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 151 transitions. [2024-11-09 04:50:33,781 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 151 transitions. Word has length 134 [2024-11-09 04:50:33,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:50:33,781 INFO L471 AbstractCegarLoop]: Abstraction has 145 states and 151 transitions. [2024-11-09 04:50:33,781 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.15) internal successors, (126), 40 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 04:50:33,781 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 151 transitions. [2024-11-09 04:50:33,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2024-11-09 04:50:33,782 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:50:33,782 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 04:50:33,803 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2024-11-09 04:50:33,982 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2024-11-09 04:50:33,983 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:50:33,983 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:50:33,983 INFO L85 PathProgramCache]: Analyzing trace with hash -129584483, now seen corresponding path program 24 times [2024-11-09 04:50:33,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:50:33,983 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898487383] [2024-11-09 04:50:33,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:50:33,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:50:34,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:50:50,604 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 30 proven. 537 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 04:50:50,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:50:50,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898487383] [2024-11-09 04:50:50,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1898487383] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:50:50,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [570404886] [2024-11-09 04:50:50,605 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:50:50,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:50:50,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:50:50,606 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:50:50,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-09 04:50:50,780 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:50:50,780 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:50:50,785 INFO L255 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 237 conjuncts are in the unsatisfiable core [2024-11-09 04:50:50,795 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:50:56,306 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 0 proven. 558 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 04:50:56,306 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:51:13,182 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:51:13,182 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 04:51:29,602 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 04:51:29,602 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [570404886] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:51:29,602 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1269450770] [2024-11-09 04:51:29,603 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:51:29,603 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:51:29,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:51:29,604 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:51:29,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:51:30,004 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:51:33,416 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25848#true' at error location [2024-11-09 04:51:33,416 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:51:33,416 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:51:33,417 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 66, 61] total 166 [2024-11-09 04:51:33,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471335313] [2024-11-09 04:51:33,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:51:33,417 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 166 states [2024-11-09 04:51:33,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:51:33,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2024-11-09 04:51:33,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=767, Invalid=30739, Unknown=0, NotChecked=0, Total=31506 [2024-11-09 04:51:33,419 INFO L87 Difference]: Start difference. First operand 145 states and 151 transitions. Second operand has 166 states, 166 states have (on average 2.072289156626506) internal successors, (344), 166 states have internal predecessors, (344), 0 states have call successors, (0), 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 04:52:09,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:52:09,701 INFO L93 Difference]: Finished difference Result 378 states and 399 transitions. [2024-11-09 04:52:09,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2024-11-09 04:52:09,701 INFO L78 Accepts]: Start accepts. Automaton has has 166 states, 166 states have (on average 2.072289156626506) internal successors, (344), 166 states have internal predecessors, (344), 0 states have call successors, (0), 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 04:52:09,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:52:09,703 INFO L225 Difference]: With dead ends: 378 [2024-11-09 04:52:09,703 INFO L226 Difference]: Without dead ends: 374 [2024-11-09 04:52:09,706 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 328 SyntacticMatches, 4 SemanticMatches, 280 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18111 ImplicationChecksByTransitivity, 50.0s TimeCoverageRelationStatistics Valid=2871, Invalid=76371, Unknown=0, NotChecked=0, Total=79242 [2024-11-09 04:52:09,707 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 161 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 16225 mSolverCounterSat, 229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 16454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 16225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.3s IncrementalHoareTripleChecker+Time [2024-11-09 04:52:09,707 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 344 Invalid, 16454 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [229 Valid, 16225 Invalid, 0 Unknown, 0 Unchecked, 13.3s Time] [2024-11-09 04:52:09,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2024-11-09 04:52:09,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 254. [2024-11-09 04:52:09,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 253 states have (on average 1.0592885375494072) internal successors, (268), 253 states have internal predecessors, (268), 0 states have call successors, (0), 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 04:52:09,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 268 transitions. [2024-11-09 04:52:09,824 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 268 transitions. Word has length 144 [2024-11-09 04:52:09,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:52:09,824 INFO L471 AbstractCegarLoop]: Abstraction has 254 states and 268 transitions. [2024-11-09 04:52:09,825 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 166 states, 166 states have (on average 2.072289156626506) internal successors, (344), 166 states have internal predecessors, (344), 0 states have call successors, (0), 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 04:52:09,825 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 268 transitions. [2024-11-09 04:52:09,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2024-11-09 04:52:09,825 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:52:09,825 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 04:52:09,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2024-11-09 04:52:10,026 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-11-09 04:52:10,026 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:52:10,026 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:52:10,026 INFO L85 PathProgramCache]: Analyzing trace with hash 923840322, now seen corresponding path program 25 times [2024-11-09 04:52:10,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:52:10,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536097681] [2024-11-09 04:52:10,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:52:10,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:52:10,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:52:10,423 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 04:52:10,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:52:10,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536097681] [2024-11-09 04:52:10,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536097681] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:52:10,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663857738] [2024-11-09 04:52:10,423 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:52:10,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:52:10,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:52:10,425 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:52:10,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2024-11-09 04:52:10,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:52:10,591 INFO L255 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-09 04:52:10,593 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:52:10,901 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 04:52:10,901 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:52:11,146 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 04:52:11,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663857738] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:52:11,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2130012901] [2024-11-09 04:52:11,147 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:52:11,147 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:52:11,147 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:52:11,147 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:52:11,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:52:11,552 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:52:12,158 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28026#true' at error location [2024-11-09 04:52:12,159 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:52:12,159 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:52:12,159 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2024-11-09 04:52:12,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769854198] [2024-11-09 04:52:12,159 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:52:12,160 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-09 04:52:12,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:52:12,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-09 04:52:12,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=1739, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 04:52:12,161 INFO L87 Difference]: Start difference. First operand 254 states and 268 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 04:52:13,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:52:13,112 INFO L93 Difference]: Finished difference Result 526 states and 553 transitions. [2024-11-09 04:52:13,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-11-09 04:52:13,113 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 04:52:13,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:52:13,114 INFO L225 Difference]: With dead ends: 526 [2024-11-09 04:52:13,115 INFO L226 Difference]: Without dead ends: 235 [2024-11-09 04:52:13,115 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 459 GetRequests, 393 SyntacticMatches, 22 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=331, Invalid=1739, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 04:52:13,116 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 80 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 988 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 1073 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 988 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 04:52:13,116 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 65 Invalid, 1073 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 988 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 04:52:13,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2024-11-09 04:52:13,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 234. [2024-11-09 04:52:13,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 233 states have (on average 1.055793991416309) internal successors, (246), 233 states have internal predecessors, (246), 0 states have call successors, (0), 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 04:52:13,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 246 transitions. [2024-11-09 04:52:13,286 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 246 transitions. Word has length 146 [2024-11-09 04:52:13,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:52:13,286 INFO L471 AbstractCegarLoop]: Abstraction has 234 states and 246 transitions. [2024-11-09 04:52:13,286 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 04:52:13,286 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 246 transitions. [2024-11-09 04:52:13,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2024-11-09 04:52:13,287 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:52:13,287 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 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 04:52:13,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2024-11-09 04:52:13,488 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2024-11-09 04:52:13,488 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:52:13,488 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:52:13,488 INFO L85 PathProgramCache]: Analyzing trace with hash 236472807, now seen corresponding path program 26 times [2024-11-09 04:52:13,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:52:13,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033130933] [2024-11-09 04:52:13,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:52:13,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:52:13,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:52:13,927 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 64 proven. 117 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2024-11-09 04:52:13,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:52:13,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033130933] [2024-11-09 04:52:13,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033130933] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:52:13,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547563153] [2024-11-09 04:52:13,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:52:13,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:52:13,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:52:13,929 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:52:13,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2024-11-09 04:52:14,182 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2024-11-09 04:52:14,182 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:52:14,186 INFO L255 TraceCheckSpWp]: Trace formula consists of 496 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-09 04:52:14,188 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:52:14,694 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 100 proven. 81 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2024-11-09 04:52:14,694 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:52:15,175 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 100 proven. 81 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2024-11-09 04:52:15,176 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547563153] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:52:15,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1753152001] [2024-11-09 04:52:15,177 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:52:15,177 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:52:15,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:52:15,177 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:52:15,177 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:52:15,514 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:52:16,280 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30073#true' at error location [2024-11-09 04:52:16,281 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:52:16,281 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:52:16,281 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 54 [2024-11-09 04:52:16,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929792260] [2024-11-09 04:52:16,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:52:16,282 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2024-11-09 04:52:16,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:52:16,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2024-11-09 04:52:16,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=3835, Unknown=0, NotChecked=0, Total=4290 [2024-11-09 04:52:16,283 INFO L87 Difference]: Start difference. First operand 234 states and 246 transitions. Second operand has 54 states, 54 states have (on average 2.4444444444444446) internal successors, (132), 54 states have internal predecessors, (132), 0 states have call successors, (0), 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 04:52:17,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:52:17,291 INFO L93 Difference]: Finished difference Result 355 states and 377 transitions. [2024-11-09 04:52:17,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2024-11-09 04:52:17,292 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.4444444444444446) internal successors, (132), 54 states have internal predecessors, (132), 0 states have call successors, (0), 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 148 [2024-11-09 04:52:17,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:52:17,293 INFO L225 Difference]: With dead ends: 355 [2024-11-09 04:52:17,293 INFO L226 Difference]: Without dead ends: 186 [2024-11-09 04:52:17,294 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 387 SyntacticMatches, 14 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2155 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=643, Invalid=5209, Unknown=0, NotChecked=0, Total=5852 [2024-11-09 04:52:17,294 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 333 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 983 mSolverCounterSat, 206 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 1189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 206 IncrementalHoareTripleChecker+Valid, 983 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 04:52:17,294 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [333 Valid, 90 Invalid, 1189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 983 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 04:52:17,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2024-11-09 04:52:17,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 159. [2024-11-09 04:52:17,377 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 04:52:17,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 165 transitions. [2024-11-09 04:52:17,378 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 165 transitions. Word has length 148 [2024-11-09 04:52:17,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:52:17,378 INFO L471 AbstractCegarLoop]: Abstraction has 159 states and 165 transitions. [2024-11-09 04:52:17,378 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.4444444444444446) internal successors, (132), 54 states have internal predecessors, (132), 0 states have call successors, (0), 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 04:52:17,378 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 165 transitions. [2024-11-09 04:52:17,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2024-11-09 04:52:17,379 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:52:17,379 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 04:52:17,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2024-11-09 04:52:17,579 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-11-09 04:52:17,579 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:52:17,580 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:52:17,580 INFO L85 PathProgramCache]: Analyzing trace with hash -1045110400, now seen corresponding path program 27 times [2024-11-09 04:52:17,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:52:17,580 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791635110] [2024-11-09 04:52:17,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:52:17,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:52:17,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:52:38,686 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 72 proven. 628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 04:52:38,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:52:38,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791635110] [2024-11-09 04:52:38,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791635110] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:52:38,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702891216] [2024-11-09 04:52:38,687 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:52:38,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:52:38,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:52:38,690 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:52:38,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2024-11-09 04:52:38,885 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:52:38,886 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:52:38,891 WARN L253 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 263 conjuncts are in the unsatisfiable core [2024-11-09 04:52:38,895 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:52:46,464 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 0 proven. 684 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2024-11-09 04:52:46,464 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:53:08,990 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:53:08,991 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 915 [2024-11-09 04:53:53,963 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 04:53:53,963 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702891216] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:53:53,963 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [9707664] [2024-11-09 04:53:53,964 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:53:53,964 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:53:53,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:53:53,965 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:53:53,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:53:54,316 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:53:58,005 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31804#true' at error location [2024-11-09 04:53:58,005 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:53:58,005 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:53:58,006 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 72, 67] total 186 [2024-11-09 04:53:58,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941300036] [2024-11-09 04:53:58,006 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:53:58,006 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 186 states [2024-11-09 04:53:58,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:53:58,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2024-11-09 04:53:58,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=858, Invalid=37754, Unknown=0, NotChecked=0, Total=38612 [2024-11-09 04:53:58,011 INFO L87 Difference]: Start difference. First operand 159 states and 165 transitions. Second operand has 186 states, 186 states have (on average 2.064516129032258) internal successors, (384), 186 states have internal predecessors, (384), 0 states have call successors, (0), 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 04:54:42,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:54:42,348 INFO L93 Difference]: Finished difference Result 368 states and 387 transitions. [2024-11-09 04:54:42,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2024-11-09 04:54:42,348 INFO L78 Accepts]: Start accepts. Automaton has has 186 states, 186 states have (on average 2.064516129032258) internal successors, (384), 186 states have internal predecessors, (384), 0 states have call successors, (0), 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 04:54:42,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:54:42,350 INFO L225 Difference]: With dead ends: 368 [2024-11-09 04:54:42,351 INFO L226 Difference]: Without dead ends: 364 [2024-11-09 04:54:42,355 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 358 SyntacticMatches, 4 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19143 ImplicationChecksByTransitivity, 59.9s TimeCoverageRelationStatistics Valid=3280, Invalid=79952, Unknown=0, NotChecked=0, Total=83232 [2024-11-09 04:54:42,356 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 307 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 21832 mSolverCounterSat, 372 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 22204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 372 IncrementalHoareTripleChecker+Valid, 21832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.6s IncrementalHoareTripleChecker+Time [2024-11-09 04:54:42,356 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [307 Valid, 410 Invalid, 22204 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [372 Valid, 21832 Invalid, 0 Unknown, 0 Unchecked, 19.6s Time] [2024-11-09 04:54:42,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2024-11-09 04:54:42,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 230. [2024-11-09 04:54:42,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.0480349344978166) internal successors, (240), 229 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 04:54:42,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 240 transitions. [2024-11-09 04:54:42,502 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 240 transitions. Word has length 158 [2024-11-09 04:54:42,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:54:42,503 INFO L471 AbstractCegarLoop]: Abstraction has 230 states and 240 transitions. [2024-11-09 04:54:42,503 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 186 states, 186 states have (on average 2.064516129032258) internal successors, (384), 186 states have internal predecessors, (384), 0 states have call successors, (0), 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 04:54:42,503 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 240 transitions. [2024-11-09 04:54:42,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2024-11-09 04:54:42,504 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:54:42,504 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 04:54:42,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2024-11-09 04:54:42,705 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-11-09 04:54:42,705 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:54:42,705 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:54:42,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1257528987, now seen corresponding path program 28 times [2024-11-09 04:54:42,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:54:42,705 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584105833] [2024-11-09 04:54:42,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:54:42,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:54:42,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:54:43,170 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 04:54:43,170 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:54:43,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584105833] [2024-11-09 04:54:43,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584105833] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:54:43,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341669595] [2024-11-09 04:54:43,170 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:54:43,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:54:43,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:54:43,171 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:54:43,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2024-11-09 04:54:43,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:54:43,353 INFO L255 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-09 04:54:43,355 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:54:43,726 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 04:54:43,726 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:54:44,070 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 04:54:44,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341669595] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:54:44,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1979837457] [2024-11-09 04:54:44,072 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:54:44,072 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:54:44,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:54:44,073 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:54:44,073 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:54:44,493 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:54:45,127 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34011#true' at error location [2024-11-09 04:54:45,127 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:54:45,127 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:54:45,128 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2024-11-09 04:54:45,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389601524] [2024-11-09 04:54:45,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:54:45,128 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-09 04:54:45,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:54:45,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-09 04:54:45,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=1971, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 04:54:45,129 INFO L87 Difference]: Start difference. First operand 230 states and 240 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 04:54:45,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:54:45,959 INFO L93 Difference]: Finished difference Result 552 states and 577 transitions. [2024-11-09 04:54:45,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2024-11-09 04:54:45,959 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 04:54:45,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:54:45,961 INFO L225 Difference]: With dead ends: 552 [2024-11-09 04:54:45,961 INFO L226 Difference]: Without dead ends: 233 [2024-11-09 04:54:45,962 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 432 SyntacticMatches, 24 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=381, Invalid=1971, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 04:54:45,962 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 101 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 970 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 1065 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 970 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 04:54:45,963 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 53 Invalid, 1065 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 970 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 04:54:45,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2024-11-09 04:54:46,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 232. [2024-11-09 04:54:46,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 231 states have (on average 1.0476190476190477) internal successors, (242), 231 states have internal predecessors, (242), 0 states have call successors, (0), 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 04:54:46,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 242 transitions. [2024-11-09 04:54:46,084 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 242 transitions. Word has length 160 [2024-11-09 04:54:46,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:54:46,084 INFO L471 AbstractCegarLoop]: Abstraction has 232 states and 242 transitions. [2024-11-09 04:54:46,085 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 04:54:46,085 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 242 transitions. [2024-11-09 04:54:46,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2024-11-09 04:54:46,085 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:54:46,086 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 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 04:54:46,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2024-11-09 04:54:46,286 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:54:46,286 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:54:46,286 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:54:46,287 INFO L85 PathProgramCache]: Analyzing trace with hash 472463178, now seen corresponding path program 29 times [2024-11-09 04:54:46,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:54:46,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023268041] [2024-11-09 04:54:46,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:54:46,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:54:46,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:54:46,914 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 81 proven. 140 refuted. 0 times theorem prover too weak. 521 trivial. 0 not checked. [2024-11-09 04:54:46,914 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:54:46,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023268041] [2024-11-09 04:54:46,914 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023268041] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:54:46,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506876521] [2024-11-09 04:54:46,914 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:54:46,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:54:46,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:54:46,915 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:54:46,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2024-11-09 04:54:47,264 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2024-11-09 04:54:47,264 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:54:47,268 INFO L255 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-09 04:54:47,269 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:54:47,827 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 110 proven. 111 refuted. 0 times theorem prover too weak. 521 trivial. 0 not checked. [2024-11-09 04:54:47,827 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:54:48,270 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 110 proven. 111 refuted. 0 times theorem prover too weak. 521 trivial. 0 not checked. [2024-11-09 04:54:48,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506876521] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:54:48,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1842459117] [2024-11-09 04:54:48,271 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:54:48,272 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:54:48,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:54:48,272 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:54:48,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:54:48,699 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:54:49,332 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36181#true' at error location [2024-11-09 04:54:49,333 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:54:49,333 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:54:49,333 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2024-11-09 04:54:49,333 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032836844] [2024-11-09 04:54:49,333 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:54:49,334 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2024-11-09 04:54:49,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:54:49,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2024-11-09 04:54:49,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=458, Invalid=2848, Unknown=0, NotChecked=0, Total=3306 [2024-11-09 04:54:49,335 INFO L87 Difference]: Start difference. First operand 232 states and 242 transitions. Second operand has 48 states, 48 states have (on average 3.2083333333333335) internal successors, (154), 48 states have internal predecessors, (154), 0 states have call successors, (0), 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 04:54:50,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:54:50,517 INFO L93 Difference]: Finished difference Result 364 states and 384 transitions. [2024-11-09 04:54:50,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-09 04:54:50,517 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.2083333333333335) internal successors, (154), 48 states have internal predecessors, (154), 0 states have call successors, (0), 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 162 [2024-11-09 04:54:50,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:54:50,518 INFO L225 Difference]: With dead ends: 364 [2024-11-09 04:54:50,518 INFO L226 Difference]: Without dead ends: 179 [2024-11-09 04:54:50,519 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 440 SyntacticMatches, 25 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2631 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=766, Invalid=4204, Unknown=0, NotChecked=0, Total=4970 [2024-11-09 04:54:50,519 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 372 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 1554 mSolverCounterSat, 314 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 372 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1868 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 314 IncrementalHoareTripleChecker+Valid, 1554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 04:54:50,520 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [372 Valid, 64 Invalid, 1868 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [314 Valid, 1554 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 04:54:50,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2024-11-09 04:54:50,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 173. [2024-11-09 04:54:50,605 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 04:54:50,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 179 transitions. [2024-11-09 04:54:50,606 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 179 transitions. Word has length 162 [2024-11-09 04:54:50,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:54:50,606 INFO L471 AbstractCegarLoop]: Abstraction has 173 states and 179 transitions. [2024-11-09 04:54:50,606 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.2083333333333335) internal successors, (154), 48 states have internal predecessors, (154), 0 states have call successors, (0), 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 04:54:50,606 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 179 transitions. [2024-11-09 04:54:50,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2024-11-09 04:54:50,606 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:54:50,607 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 04:54:50,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2024-11-09 04:54:50,807 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:54:50,807 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:54:50,807 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:54:50,808 INFO L85 PathProgramCache]: Analyzing trace with hash 67045155, now seen corresponding path program 30 times [2024-11-09 04:54:50,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:54:50,808 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743332465] [2024-11-09 04:54:50,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:54:50,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:54:51,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:55:16,586 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 56 proven. 791 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 04:55:16,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:55:16,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743332465] [2024-11-09 04:55:16,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [743332465] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:55:16,587 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538554260] [2024-11-09 04:55:16,587 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:55:16,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:55:16,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:55:16,588 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:55:16,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2024-11-09 04:55:16,794 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:55:16,794 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:55:16,800 WARN L253 TraceCheckSpWp]: Trace formula consists of 572 conjuncts, 291 conjuncts are in the unsatisfiable core [2024-11-09 04:55:16,804 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:55:26,973 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 0 proven. 843 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 04:55:26,973 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:55:52,912 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:55:52,913 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 188 treesize of output 1105 [2024-11-09 04:56:37,767 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 04:56:37,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538554260] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:56:37,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2132456622] [2024-11-09 04:56:37,768 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:56:37,768 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:56:37,769 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:56:37,769 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:56:37,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:56:38,265 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:56:42,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38038#true' at error location [2024-11-09 04:56:42,713 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:56:42,713 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:56:42,714 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 81, 73] total 203 [2024-11-09 04:56:42,714 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685724303] [2024-11-09 04:56:42,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:56:42,715 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2024-11-09 04:56:42,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:56:42,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2024-11-09 04:56:42,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1192, Invalid=44390, Unknown=0, NotChecked=0, Total=45582 [2024-11-09 04:56:42,721 INFO L87 Difference]: Start difference. First operand 173 states and 179 transitions. Second operand has 203 states, 203 states have (on average 2.0591133004926108) internal successors, (418), 203 states have internal predecessors, (418), 0 states have call successors, (0), 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 04:57:41,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:57:41,763 INFO L93 Difference]: Finished difference Result 421 states and 441 transitions. [2024-11-09 04:57:41,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2024-11-09 04:57:41,764 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 2.0591133004926108) internal successors, (418), 203 states have internal predecessors, (418), 0 states have call successors, (0), 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 172 [2024-11-09 04:57:41,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:57:41,766 INFO L225 Difference]: With dead ends: 421 [2024-11-09 04:57:41,766 INFO L226 Difference]: Without dead ends: 417 [2024-11-09 04:57:41,771 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 390 SyntacticMatches, 4 SemanticMatches, 316 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27637 ImplicationChecksByTransitivity, 74.4s TimeCoverageRelationStatistics Valid=4095, Invalid=96711, Unknown=0, NotChecked=0, Total=100806 [2024-11-09 04:57:41,771 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 307 mSDsluCounter, 390 mSDsCounter, 0 mSdLazyCounter, 24243 mSolverCounterSat, 400 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 24643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 400 IncrementalHoareTripleChecker+Valid, 24243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.8s IncrementalHoareTripleChecker+Time [2024-11-09 04:57:41,771 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [307 Valid, 402 Invalid, 24643 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [400 Valid, 24243 Invalid, 0 Unknown, 0 Unchecked, 26.8s Time] [2024-11-09 04:57:41,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2024-11-09 04:57:42,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 250. [2024-11-09 04:57:42,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 249 states have (on average 1.0441767068273093) internal successors, (260), 249 states have internal predecessors, (260), 0 states have call successors, (0), 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 04:57:42,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 260 transitions. [2024-11-09 04:57:42,128 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 260 transitions. Word has length 172 [2024-11-09 04:57:42,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:57:42,128 INFO L471 AbstractCegarLoop]: Abstraction has 250 states and 260 transitions. [2024-11-09 04:57:42,129 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 2.0591133004926108) internal successors, (418), 203 states have internal predecessors, (418), 0 states have call successors, (0), 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 04:57:42,129 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 260 transitions. [2024-11-09 04:57:42,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2024-11-09 04:57:42,130 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:57:42,130 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 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 04:57:42,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2024-11-09 04:57:42,331 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:57:42,331 INFO L396 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:57:42,331 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:57:42,331 INFO L85 PathProgramCache]: Analyzing trace with hash -330573240, now seen corresponding path program 31 times [2024-11-09 04:57:42,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:57:42,332 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819006726] [2024-11-09 04:57:42,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:57:42,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:57:42,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:57:43,137 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 123 proven. 142 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2024-11-09 04:57:43,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:57:43,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819006726] [2024-11-09 04:57:43,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819006726] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:57:43,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628380782] [2024-11-09 04:57:43,137 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 04:57:43,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:57:43,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:57:43,139 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:57:43,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2024-11-09 04:57:43,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:57:43,360 INFO L255 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-09 04:57:43,362 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:57:43,961 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 144 proven. 121 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2024-11-09 04:57:43,961 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:57:44,331 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 144 proven. 121 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2024-11-09 04:57:44,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1628380782] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:57:44,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [971921948] [2024-11-09 04:57:44,332 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:57:44,333 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:57:44,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:57:44,333 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:57:44,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:57:44,739 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:57:45,512 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40479#true' at error location [2024-11-09 04:57:45,513 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:57:45,513 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:57:45,513 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2024-11-09 04:57:45,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557259064] [2024-11-09 04:57:45,513 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:57:45,514 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2024-11-09 04:57:45,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:57:45,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2024-11-09 04:57:45,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=2217, Unknown=0, NotChecked=0, Total=2652 [2024-11-09 04:57:45,515 INFO L87 Difference]: Start difference. First operand 250 states and 260 transitions. Second operand has 41 states, 41 states have (on average 2.5365853658536586) internal successors, (104), 41 states have internal predecessors, (104), 0 states have call successors, (0), 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 04:57:46,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:57:46,608 INFO L93 Difference]: Finished difference Result 600 states and 625 transitions. [2024-11-09 04:57:46,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2024-11-09 04:57:46,608 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.5365853658536586) internal successors, (104), 41 states have internal predecessors, (104), 0 states have call successors, (0), 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 174 [2024-11-09 04:57:46,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:57:46,610 INFO L225 Difference]: With dead ends: 600 [2024-11-09 04:57:46,610 INFO L226 Difference]: Without dead ends: 253 [2024-11-09 04:57:46,611 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 547 GetRequests, 471 SyntacticMatches, 26 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1459 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=435, Invalid=2217, Unknown=0, NotChecked=0, Total=2652 [2024-11-09 04:57:46,611 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 120 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 1075 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 1190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 1075 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 04:57:46,611 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 53 Invalid, 1190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 1075 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 04:57:46,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2024-11-09 04:57:46,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 252. [2024-11-09 04:57:46,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 251 states have (on average 1.043824701195219) internal successors, (262), 251 states have internal predecessors, (262), 0 states have call successors, (0), 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 04:57:46,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 262 transitions. [2024-11-09 04:57:46,794 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 262 transitions. Word has length 174 [2024-11-09 04:57:46,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:57:46,795 INFO L471 AbstractCegarLoop]: Abstraction has 252 states and 262 transitions. [2024-11-09 04:57:46,795 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.5365853658536586) internal successors, (104), 41 states have internal predecessors, (104), 0 states have call successors, (0), 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 04:57:46,795 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 262 transitions. [2024-11-09 04:57:46,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2024-11-09 04:57:46,796 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:57:46,797 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 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 04:57:46,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2024-11-09 04:57:46,997 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:57:46,997 INFO L396 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:57:46,998 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:57:46,998 INFO L85 PathProgramCache]: Analyzing trace with hash 851884909, now seen corresponding path program 32 times [2024-11-09 04:57:46,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:57:46,998 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634805042] [2024-11-09 04:57:46,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:57:46,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:57:47,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:57:47,660 INFO L134 CoverageAnalysis]: Checked inductivity of 893 backedges. 100 proven. 165 refuted. 0 times theorem prover too weak. 628 trivial. 0 not checked. [2024-11-09 04:57:47,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:57:47,661 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634805042] [2024-11-09 04:57:47,661 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634805042] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:57:47,661 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137463479] [2024-11-09 04:57:47,661 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 04:57:47,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:57:47,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:57:47,662 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:57:47,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2024-11-09 04:57:48,207 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2024-11-09 04:57:48,207 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:57:48,214 INFO L255 TraceCheckSpWp]: Trace formula consists of 588 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-09 04:57:48,217 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:57:48,757 INFO L134 CoverageAnalysis]: Checked inductivity of 893 backedges. 132 proven. 133 refuted. 0 times theorem prover too weak. 628 trivial. 0 not checked. [2024-11-09 04:57:48,757 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:57:49,306 INFO L134 CoverageAnalysis]: Checked inductivity of 893 backedges. 132 proven. 133 refuted. 0 times theorem prover too weak. 628 trivial. 0 not checked. [2024-11-09 04:57:49,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137463479] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 04:57:49,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [388508717] [2024-11-09 04:57:49,307 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 04:57:49,307 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 04:57:49,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 04:57:49,308 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 04:57:49,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 04:57:49,707 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 04:57:50,357 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42838#true' at error location [2024-11-09 04:57:50,357 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 04:57:50,357 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 04:57:50,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2024-11-09 04:57:50,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365862574] [2024-11-09 04:57:50,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 04:57:50,358 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2024-11-09 04:57:50,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 04:57:50,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2024-11-09 04:57:50,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=443, Invalid=2313, Unknown=0, NotChecked=0, Total=2756 [2024-11-09 04:57:50,360 INFO L87 Difference]: Start difference. First operand 252 states and 262 transitions. Second operand has 41 states, 41 states have (on average 3.5853658536585367) internal successors, (147), 41 states have internal predecessors, (147), 0 states have call successors, (0), 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 04:57:51,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 04:57:51,188 INFO L93 Difference]: Finished difference Result 394 states and 414 transitions. [2024-11-09 04:57:51,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2024-11-09 04:57:51,188 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.5853658536585367) internal successors, (147), 41 states have internal predecessors, (147), 0 states have call successors, (0), 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 176 [2024-11-09 04:57:51,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 04:57:51,189 INFO L225 Difference]: With dead ends: 394 [2024-11-09 04:57:51,190 INFO L226 Difference]: Without dead ends: 193 [2024-11-09 04:57:51,190 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 555 GetRequests, 475 SyntacticMatches, 27 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1834 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=475, Invalid=2495, Unknown=0, NotChecked=0, Total=2970 [2024-11-09 04:57:51,191 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 220 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 641 mSolverCounterSat, 219 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 860 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 219 IncrementalHoareTripleChecker+Valid, 641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 04:57:51,191 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 60 Invalid, 860 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [219 Valid, 641 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 04:57:51,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2024-11-09 04:57:51,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 187. [2024-11-09 04:57:51,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 186 states have (on average 1.0376344086021505) internal successors, (193), 186 states have internal predecessors, (193), 0 states have call successors, (0), 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 04:57:51,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 193 transitions. [2024-11-09 04:57:51,309 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 193 transitions. Word has length 176 [2024-11-09 04:57:51,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 04:57:51,309 INFO L471 AbstractCegarLoop]: Abstraction has 187 states and 193 transitions. [2024-11-09 04:57:51,309 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.5853658536585367) internal successors, (147), 41 states have internal predecessors, (147), 0 states have call successors, (0), 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 04:57:51,310 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 193 transitions. [2024-11-09 04:57:51,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2024-11-09 04:57:51,310 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 04:57:51,310 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 04:57:51,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2024-11-09 04:57:51,511 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2024-11-09 04:57:51,511 INFO L396 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 04:57:51,511 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 04:57:51,511 INFO L85 PathProgramCache]: Analyzing trace with hash -1737075834, now seen corresponding path program 33 times [2024-11-09 04:57:51,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 04:57:51,511 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638645624] [2024-11-09 04:57:51,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 04:57:51,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 04:57:51,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 04:58:27,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 36 proven. 972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 04:58:27,469 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 04:58:27,469 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638645624] [2024-11-09 04:58:27,469 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638645624] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 04:58:27,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311015354] [2024-11-09 04:58:27,470 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 04:58:27,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 04:58:27,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 04:58:27,471 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 04:58:27,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_48020d59-50b1-48af-bbba-56506b6bedc2/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2024-11-09 04:58:27,749 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 04:58:27,750 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 04:58:27,759 WARN L253 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 319 conjuncts are in the unsatisfiable core [2024-11-09 04:58:27,765 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 04:58:39,473 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 0 proven. 1004 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 04:58:39,473 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 04:59:17,918 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 04:59:17,919 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 205 treesize of output 1313