./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-cav19/array_init_pair_symmetr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_init_pair_symmetr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh --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 94a3c9718d8b0819c3a22a45f77fd4dac96406e3aa7eff964888695d6121efac --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 19:08:43,893 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 19:08:43,957 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 19:08:43,963 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 19:08:43,963 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 19:08:43,987 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 19:08:43,987 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 19:08:43,988 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 19:08:43,988 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 19:08:43,989 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 19:08:43,989 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 19:08:43,990 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 19:08:43,990 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 19:08:43,991 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 19:08:43,991 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 19:08:43,992 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 19:08:43,992 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 19:08:43,993 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 19:08:43,993 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 19:08:43,994 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 19:08:43,995 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 19:08:43,996 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 19:08:43,997 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 19:08:43,997 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 19:08:43,998 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 19:08:43,998 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 19:08:43,999 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 19:08:43,999 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 19:08:43,999 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 19:08:44,000 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 19:08:44,000 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 19:08:44,001 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 19:08:44,001 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 19:08:44,001 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 19:08:44,002 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 19:08:44,002 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 19:08:44,002 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 19:08:44,002 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:08:44,003 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 19:08:44,003 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 19:08:44,003 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 19:08:44,003 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 19:08:44,004 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 19:08:44,004 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 19:08:44,004 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 19:08:44,004 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 19:08:44,004 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 19:08:44,005 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_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 94a3c9718d8b0819c3a22a45f77fd4dac96406e3aa7eff964888695d6121efac [2023-12-02 19:08:44,221 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 19:08:44,245 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 19:08:44,247 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 19:08:44,248 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 19:08:44,249 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 19:08:44,250 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-cav19/array_init_pair_symmetr.c [2023-12-02 19:08:46,899 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 19:08:47,075 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 19:08:47,076 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/sv-benchmarks/c/array-cav19/array_init_pair_symmetr.c [2023-12-02 19:08:47,083 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/data/788d08144/70162d61fcd44adea60b108f61f84819/FLAG3305a4d17 [2023-12-02 19:08:47,099 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/data/788d08144/70162d61fcd44adea60b108f61f84819 [2023-12-02 19:08:47,101 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 19:08:47,103 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 19:08:47,104 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 19:08:47,105 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 19:08:47,110 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 19:08:47,111 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,112 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a177b13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47, skipping insertion in model container [2023-12-02 19:08:47,112 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,135 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 19:08:47,286 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/sv-benchmarks/c/array-cav19/array_init_pair_symmetr.c[414,427] [2023-12-02 19:08:47,302 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:08:47,310 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 19:08:47,323 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/sv-benchmarks/c/array-cav19/array_init_pair_symmetr.c[414,427] [2023-12-02 19:08:47,330 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:08:47,345 INFO L206 MainTranslator]: Completed translation [2023-12-02 19:08:47,346 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47 WrapperNode [2023-12-02 19:08:47,346 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 19:08:47,347 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 19:08:47,348 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 19:08:47,348 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 19:08:47,356 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,365 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,388 INFO L138 Inliner]: procedures = 15, calls = 24, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 76 [2023-12-02 19:08:47,388 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 19:08:47,389 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 19:08:47,389 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 19:08:47,389 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 19:08:47,400 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,400 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,403 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,403 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,409 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,413 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,415 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,416 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,419 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 19:08:47,420 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 19:08:47,420 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 19:08:47,420 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 19:08:47,421 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (1/1) ... [2023-12-02 19:08:47,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:08:47,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:08:47,457 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 19:08:47,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 19:08:47,493 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 19:08:47,494 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 19:08:47,494 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 19:08:47,494 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 19:08:47,494 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 19:08:47,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 19:08:47,495 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 19:08:47,495 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 19:08:47,577 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 19:08:47,580 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 19:08:47,732 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 19:08:47,790 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 19:08:47,790 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 19:08:47,792 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:08:47 BoogieIcfgContainer [2023-12-02 19:08:47,792 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 19:08:47,796 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 19:08:47,796 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 19:08:47,799 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 19:08:47,800 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 07:08:47" (1/3) ... [2023-12-02 19:08:47,800 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@232ff6be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:08:47, skipping insertion in model container [2023-12-02 19:08:47,801 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:08:47" (2/3) ... [2023-12-02 19:08:47,801 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@232ff6be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:08:47, skipping insertion in model container [2023-12-02 19:08:47,801 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:08:47" (3/3) ... [2023-12-02 19:08:47,803 INFO L112 eAbstractionObserver]: Analyzing ICFG array_init_pair_symmetr.c [2023-12-02 19:08:47,822 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 19:08:47,822 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 19:08:47,870 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 19:08:47,877 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@b6e57a1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 19:08:47,877 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 19:08:47,881 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:47,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 19:08:47,888 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:08:47,888 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 19:08:47,889 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:08:47,894 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:08:47,894 INFO L85 PathProgramCache]: Analyzing trace with hash -1444430260, now seen corresponding path program 1 times [2023-12-02 19:08:47,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:08:47,905 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924097882] [2023-12-02 19:08:47,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:08:47,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:08:48,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:08:48,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:08:48,159 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:08:48,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924097882] [2023-12-02 19:08:48,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924097882] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:08:48,161 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:08:48,161 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 19:08:48,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857827608] [2023-12-02 19:08:48,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:08:48,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:08:48,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:08:48,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:08:48,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:08:48,196 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:48,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:08:48,235 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2023-12-02 19:08:48,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:08:48,238 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 19:08:48,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:08:48,243 INFO L225 Difference]: With dead ends: 17 [2023-12-02 19:08:48,244 INFO L226 Difference]: Without dead ends: 9 [2023-12-02 19:08:48,246 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:08:48,249 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:08:48,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:08:48,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-12-02 19:08:48,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-12-02 19:08:48,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:48,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2023-12-02 19:08:48,275 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2023-12-02 19:08:48,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:08:48,276 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2023-12-02 19:08:48,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:48,276 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2023-12-02 19:08:48,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 19:08:48,277 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:08:48,277 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:08:48,277 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 19:08:48,277 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:08:48,278 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:08:48,278 INFO L85 PathProgramCache]: Analyzing trace with hash -1885760445, now seen corresponding path program 1 times [2023-12-02 19:08:48,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:08:48,278 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528903242] [2023-12-02 19:08:48,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:08:48,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:08:48,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:08:48,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:08:48,394 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:08:48,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528903242] [2023-12-02 19:08:48,394 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528903242] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:08:48,394 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:08:48,394 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:08:48,395 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482942969] [2023-12-02 19:08:48,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:08:48,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:08:48,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:08:48,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:08:48,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:08:48,397 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:48,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:08:48,422 INFO L93 Difference]: Finished difference Result 15 states and 18 transitions. [2023-12-02 19:08:48,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:08:48,423 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 19:08:48,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:08:48,424 INFO L225 Difference]: With dead ends: 15 [2023-12-02 19:08:48,424 INFO L226 Difference]: Without dead ends: 10 [2023-12-02 19:08:48,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:08:48,426 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:08:48,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 6 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:08:48,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-12-02 19:08:48,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-12-02 19:08:48,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:48,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2023-12-02 19:08:48,431 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2023-12-02 19:08:48,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:08:48,431 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2023-12-02 19:08:48,432 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:48,432 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2023-12-02 19:08:48,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 19:08:48,432 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:08:48,433 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:08:48,433 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 19:08:48,433 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:08:48,434 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:08:48,434 INFO L85 PathProgramCache]: Analyzing trace with hash 1662743138, now seen corresponding path program 1 times [2023-12-02 19:08:48,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:08:48,434 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397282061] [2023-12-02 19:08:48,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:08:48,435 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:08:48,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:08:48,565 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:08:48,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:08:48,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397282061] [2023-12-02 19:08:48,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397282061] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:08:48,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948147108] [2023-12-02 19:08:48,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:08:48,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:08:48,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:08:48,570 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:08:48,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 19:08:48,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:08:48,645 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 19:08:48,649 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:08:48,704 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:08:48,704 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:08:48,726 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:08:48,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948147108] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:08:48,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618931062] [2023-12-02 19:08:48,746 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:08:48,746 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:08:48,749 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:08:48,753 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:08:48,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:08:49,506 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:08:49,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '141#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#c~0#1.base|) (+ |ULTIMATE.start_main_~#c~0#1.offset| 4)) |ULTIMATE.start_main_#t~mem10#1|) (not (= |ULTIMATE.start_main_#t~mem10#1| 0)) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:08:49,643 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:08:49,643 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:08:49,643 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2023-12-02 19:08:49,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504171404] [2023-12-02 19:08:49,644 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:08:49,644 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 19:08:49,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:08:49,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 19:08:49,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2023-12-02 19:08:49,646 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:49,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:08:49,677 INFO L93 Difference]: Finished difference Result 20 states and 26 transitions. [2023-12-02 19:08:49,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 19:08:49,678 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 19:08:49,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:08:49,678 INFO L225 Difference]: With dead ends: 20 [2023-12-02 19:08:49,678 INFO L226 Difference]: Without dead ends: 13 [2023-12-02 19:08:49,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2023-12-02 19:08:49,681 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 3 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:08:49,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 7 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:08:49,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-12-02 19:08:49,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-12-02 19:08:49,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:49,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2023-12-02 19:08:49,686 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2023-12-02 19:08:49,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:08:49,686 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2023-12-02 19:08:49,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:49,686 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2023-12-02 19:08:49,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 19:08:49,687 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:08:49,687 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:08:49,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 19:08:49,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:08:49,888 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:08:49,888 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:08:49,888 INFO L85 PathProgramCache]: Analyzing trace with hash -503710791, now seen corresponding path program 2 times [2023-12-02 19:08:49,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:08:49,889 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602716427] [2023-12-02 19:08:49,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:08:49,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:08:49,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:08:50,060 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:08:50,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:08:50,061 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602716427] [2023-12-02 19:08:50,061 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602716427] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:08:50,061 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963444492] [2023-12-02 19:08:50,061 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:08:50,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:08:50,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:08:50,066 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:08:50,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 19:08:50,144 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 19:08:50,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:08:50,145 INFO L262 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 19:08:50,147 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:08:50,196 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 19:08:50,196 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:08:50,243 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 19:08:50,243 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963444492] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:08:50,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1682307053] [2023-12-02 19:08:50,246 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:08:50,246 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:08:50,247 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:08:50,247 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:08:50,247 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:08:50,897 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:08:51,045 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '271#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#c~0#1.base|) (+ |ULTIMATE.start_main_~#c~0#1.offset| 4)) |ULTIMATE.start_main_#t~mem10#1|) (not (= |ULTIMATE.start_main_#t~mem10#1| 0)) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:08:51,045 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:08:51,046 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:08:51,046 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4] total 12 [2023-12-02 19:08:51,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073783547] [2023-12-02 19:08:51,046 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:08:51,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 19:08:51,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:08:51,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 19:08:51,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2023-12-02 19:08:51,048 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:51,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:08:51,232 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2023-12-02 19:08:51,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 19:08:51,232 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 19:08:51,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:08:51,233 INFO L225 Difference]: With dead ends: 55 [2023-12-02 19:08:51,233 INFO L226 Difference]: Without dead ends: 48 [2023-12-02 19:08:51,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=150, Invalid=356, Unknown=0, NotChecked=0, Total=506 [2023-12-02 19:08:51,235 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 99 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:08:51,235 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 24 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:08:51,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-12-02 19:08:51,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 22. [2023-12-02 19:08:51,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:51,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-12-02 19:08:51,242 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 11 [2023-12-02 19:08:51,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:08:51,242 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-12-02 19:08:51,243 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:51,243 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-12-02 19:08:51,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 19:08:51,243 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:08:51,244 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1] [2023-12-02 19:08:51,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-12-02 19:08:51,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:08:51,446 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:08:51,446 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:08:51,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1361184926, now seen corresponding path program 3 times [2023-12-02 19:08:51,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:08:51,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233196133] [2023-12-02 19:08:51,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:08:51,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:08:51,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:08:51,689 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 19:08:51,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:08:51,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233196133] [2023-12-02 19:08:51,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233196133] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:08:51,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380019468] [2023-12-02 19:08:51,689 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:08:51,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:08:51,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:08:51,691 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:08:51,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 19:08:51,831 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:08:51,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:08:51,835 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 19:08:51,837 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:08:51,980 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 19:08:51,980 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:08:52,146 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 19:08:52,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380019468] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:08:52,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1607827312] [2023-12-02 19:08:52,148 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:08:52,149 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:08:52,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:08:52,149 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:08:52,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:08:52,387 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:08:52,518 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '548#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#c~0#1.base|) (+ |ULTIMATE.start_main_~#c~0#1.offset| 4)) |ULTIMATE.start_main_#t~mem10#1|) (not (= |ULTIMATE.start_main_#t~mem10#1| 0)) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:08:52,518 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:08:52,518 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:08:52,518 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 27 [2023-12-02 19:08:52,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481893655] [2023-12-02 19:08:52,519 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:08:52,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 19:08:52,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:08:52,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 19:08:52,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=707, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 19:08:52,521 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:52,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:08:52,889 INFO L93 Difference]: Finished difference Result 124 states and 145 transitions. [2023-12-02 19:08:52,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-12-02 19:08:52,890 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-12-02 19:08:52,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:08:52,892 INFO L225 Difference]: With dead ends: 124 [2023-12-02 19:08:52,892 INFO L226 Difference]: Without dead ends: 111 [2023-12-02 19:08:52,893 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 606 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=517, Invalid=1123, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 19:08:52,894 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 272 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:08:52,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 72 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:08:52,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-12-02 19:08:52,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 40. [2023-12-02 19:08:52,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 39 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:52,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2023-12-02 19:08:52,906 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 20 [2023-12-02 19:08:52,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:08:52,906 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2023-12-02 19:08:52,906 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 27 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:52,906 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2023-12-02 19:08:52,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-12-02 19:08:52,907 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:08:52,907 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1] [2023-12-02 19:08:52,913 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 19:08:53,108 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:08:53,108 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:08:53,109 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:08:53,109 INFO L85 PathProgramCache]: Analyzing trace with hash -793550260, now seen corresponding path program 4 times [2023-12-02 19:08:53,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:08:53,109 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598656730] [2023-12-02 19:08:53,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:08:53,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:08:53,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:08:53,704 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-12-02 19:08:53,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:08:53,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598656730] [2023-12-02 19:08:53,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598656730] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:08:53,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411484614] [2023-12-02 19:08:53,705 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:08:53,705 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:08:53,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:08:53,706 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:08:53,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 19:08:53,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:08:53,882 INFO L262 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 19:08:53,885 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:08:54,179 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-12-02 19:08:54,180 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:08:54,656 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-12-02 19:08:54,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411484614] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:08:54,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1450530645] [2023-12-02 19:08:54,658 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:08:54,658 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:08:54,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:08:54,659 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:08:54,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:08:54,955 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:08:55,106 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1102#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#c~0#1.base|) (+ |ULTIMATE.start_main_~#c~0#1.offset| 4)) |ULTIMATE.start_main_#t~mem10#1|) (not (= |ULTIMATE.start_main_#t~mem10#1| 0)) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:08:55,106 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:08:55,106 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:08:55,106 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 52 [2023-12-02 19:08:55,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378722874] [2023-12-02 19:08:55,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:08:55,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 19:08:55,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:08:55,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 19:08:55,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1278, Invalid=2028, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 19:08:55,111 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 53 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 52 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:55,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:08:55,189 INFO L93 Difference]: Finished difference Result 80 states and 101 transitions. [2023-12-02 19:08:55,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 19:08:55,189 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 52 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2023-12-02 19:08:55,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:08:55,190 INFO L225 Difference]: With dead ends: 80 [2023-12-02 19:08:55,190 INFO L226 Difference]: Without dead ends: 58 [2023-12-02 19:08:55,192 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1519 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1278, Invalid=2028, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 19:08:55,193 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 3 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:08:55,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 19 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:08:55,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-12-02 19:08:55,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2023-12-02 19:08:55,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:55,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2023-12-02 19:08:55,204 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 38 [2023-12-02 19:08:55,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:08:55,205 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2023-12-02 19:08:55,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 52 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:08:55,205 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2023-12-02 19:08:55,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-12-02 19:08:55,207 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:08:55,207 INFO L195 NwaCegarLoop]: trace histogram [34, 16, 1, 1, 1, 1, 1, 1] [2023-12-02 19:08:55,213 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 19:08:55,410 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 19:08:55,410 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:08:55,410 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:08:55,410 INFO L85 PathProgramCache]: Analyzing trace with hash -172705748, now seen corresponding path program 5 times [2023-12-02 19:08:55,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:08:55,411 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200950109] [2023-12-02 19:08:55,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:08:55,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:08:55,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:08:56,843 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-12-02 19:08:56,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:08:56,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200950109] [2023-12-02 19:08:56,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200950109] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:08:56,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686839496] [2023-12-02 19:08:56,843 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:08:56,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:08:56,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:08:56,845 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:08:56,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 19:09:03,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-12-02 19:09:03,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:09:03,482 INFO L262 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 19:09:03,485 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:09:03,769 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2023-12-02 19:09:03,769 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:09:04,492 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2023-12-02 19:09:04,492 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686839496] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:09:04,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1704039637] [2023-12-02 19:09:04,495 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:09:04,495 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:09:04,495 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:09:04,495 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:09:04,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:09:04,864 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:09:05,052 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1772#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#c~0#1.base|) (+ |ULTIMATE.start_main_~#c~0#1.offset| 4)) |ULTIMATE.start_main_#t~mem10#1|) (not (= |ULTIMATE.start_main_#t~mem10#1| 0)) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:09:05,052 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:09:05,052 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:09:05,052 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 19, 19] total 72 [2023-12-02 19:09:05,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692228588] [2023-12-02 19:09:05,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:09:05,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2023-12-02 19:09:05,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:09:05,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2023-12-02 19:09:05,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2428, Invalid=3578, Unknown=0, NotChecked=0, Total=6006 [2023-12-02 19:09:05,058 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 73 states, 73 states have (on average 1.1095890410958904) internal successors, (81), 72 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) [2023-12-02 19:09:07,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:09:07,331 INFO L93 Difference]: Finished difference Result 385 states and 442 transitions. [2023-12-02 19:09:07,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2023-12-02 19:09:07,332 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.1095890410958904) internal successors, (81), 72 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) Word has length 56 [2023-12-02 19:09:07,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:09:07,334 INFO L225 Difference]: With dead ends: 385 [2023-12-02 19:09:07,334 INFO L226 Difference]: Without dead ends: 363 [2023-12-02 19:09:07,338 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3747 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4423, Invalid=8233, Unknown=0, NotChecked=0, Total=12656 [2023-12-02 19:09:07,338 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1296 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 377 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1296 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 377 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:09:07,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1296 Valid, 177 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [377 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 19:09:07,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2023-12-02 19:09:07,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 112. [2023-12-02 19:09:07,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.027027027027027) internal successors, (114), 111 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) [2023-12-02 19:09:07,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2023-12-02 19:09:07,354 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 56 [2023-12-02 19:09:07,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:09:07,355 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2023-12-02 19:09:07,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.1095890410958904) internal successors, (81), 72 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) [2023-12-02 19:09:07,355 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2023-12-02 19:09:07,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-12-02 19:09:07,358 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:09:07,358 INFO L195 NwaCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1] [2023-12-02 19:09:07,367 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 19:09:07,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 19:09:07,559 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:09:07,559 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:09:07,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1605635252, now seen corresponding path program 6 times [2023-12-02 19:09:07,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:09:07,559 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018581687] [2023-12-02 19:09:07,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:09:07,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:09:07,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:09:10,615 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2023-12-02 19:09:10,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:09:10,615 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018581687] [2023-12-02 19:09:10,615 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018581687] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:09:10,615 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94881406] [2023-12-02 19:09:10,615 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:09:10,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:09:10,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:09:10,616 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:09:10,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 19:21:06,873 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:21:06,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:21:06,911 INFO L262 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 55 conjunts are in the unsatisfiable core [2023-12-02 19:21:06,920 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:21:08,804 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2023-12-02 19:21:08,804 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:21:13,210 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2023-12-02 19:21:13,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94881406] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:21:13,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [282018402] [2023-12-02 19:21:13,212 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:21:13,212 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:21:13,213 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:21:13,213 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:21:13,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:21:13,845 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:21:14,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3444#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#c~0#1.base|) (+ |ULTIMATE.start_main_~#c~0#1.offset| 4)) |ULTIMATE.start_main_#t~mem10#1|) (not (= |ULTIMATE.start_main_#t~mem10#1| 0)) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:21:14,142 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:21:14,142 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:21:14,142 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 55, 55] total 162 [2023-12-02 19:21:14,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371945706] [2023-12-02 19:21:14,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:21:14,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2023-12-02 19:21:14,144 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:21:14,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2023-12-02 19:21:14,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11689, Invalid=16367, Unknown=0, NotChecked=0, Total=28056 [2023-12-02 19:21:14,159 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand has 163 states, 163 states have (on average 1.049079754601227) internal successors, (171), 162 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:21:24,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:21:24,753 INFO L93 Difference]: Finished difference Result 799 states and 910 transitions. [2023-12-02 19:21:24,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2023-12-02 19:21:24,754 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 1.049079754601227) internal successors, (171), 162 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 110 [2023-12-02 19:21:24,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:21:24,758 INFO L225 Difference]: With dead ends: 799 [2023-12-02 19:21:24,758 INFO L226 Difference]: Without dead ends: 741 [2023-12-02 19:21:24,763 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18336 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=17572, Invalid=31048, Unknown=0, NotChecked=0, Total=48620 [2023-12-02 19:21:24,764 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2474 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 877 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2474 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 1423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 877 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:21:24,764 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2474 Valid, 405 Invalid, 1423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [877 Valid, 546 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-12-02 19:21:24,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2023-12-02 19:21:24,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 220. [2023-12-02 19:21:24,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 219 states have (on average 1.0136986301369864) internal successors, (222), 219 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:21:24,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 222 transitions. [2023-12-02 19:21:24,795 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 222 transitions. Word has length 110 [2023-12-02 19:21:24,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:21:24,796 INFO L495 AbstractCegarLoop]: Abstraction has 220 states and 222 transitions. [2023-12-02 19:21:24,796 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 1.049079754601227) internal successors, (171), 162 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:21:24,796 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 222 transitions. [2023-12-02 19:21:24,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2023-12-02 19:21:24,800 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:21:24,800 INFO L195 NwaCegarLoop]: trace histogram [106, 106, 1, 1, 1, 1, 1, 1] [2023-12-02 19:21:24,819 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 19:21:25,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:21:25,002 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:21:25,002 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:21:25,003 INFO L85 PathProgramCache]: Analyzing trace with hash -2130275124, now seen corresponding path program 7 times [2023-12-02 19:21:25,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:21:25,003 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010747780] [2023-12-02 19:21:25,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:21:25,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:21:25,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:21:35,023 INFO L134 CoverageAnalysis]: Checked inductivity of 11342 backedges. 0 proven. 5671 refuted. 0 times theorem prover too weak. 5671 trivial. 0 not checked. [2023-12-02 19:21:35,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:21:35,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010747780] [2023-12-02 19:21:35,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010747780] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:21:35,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156737992] [2023-12-02 19:21:35,023 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:21:35,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:21:35,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:21:35,024 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:21:35,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 19:21:35,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:21:35,638 INFO L262 TraceCheckSpWp]: Trace formula consists of 2193 conjuncts, 109 conjunts are in the unsatisfiable core [2023-12-02 19:21:35,649 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:21:40,481 INFO L134 CoverageAnalysis]: Checked inductivity of 11342 backedges. 0 proven. 5671 refuted. 0 times theorem prover too weak. 5671 trivial. 0 not checked. [2023-12-02 19:21:40,481 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:21:53,597 INFO L134 CoverageAnalysis]: Checked inductivity of 11342 backedges. 0 proven. 5671 refuted. 0 times theorem prover too weak. 5671 trivial. 0 not checked. [2023-12-02 19:21:53,597 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156737992] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:21:53,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851483870] [2023-12-02 19:21:53,599 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 19:21:53,600 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:21:53,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:21:53,600 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:21:53,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:21:53,781 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:21:54,170 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6788#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#c~0#1.base|) (+ |ULTIMATE.start_main_~#c~0#1.offset| 4)) |ULTIMATE.start_main_#t~mem10#1|) (not (= |ULTIMATE.start_main_#t~mem10#1| 0)) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 19:21:54,171 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:21:54,171 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:21:54,171 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108, 108] total 322 [2023-12-02 19:21:54,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474187761] [2023-12-02 19:21:54,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:21:54,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 323 states [2023-12-02 19:21:54,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:21:54,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 323 interpolants. [2023-12-02 19:21:54,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46458, Invalid=60798, Unknown=0, NotChecked=0, Total=107256 [2023-12-02 19:21:54,205 INFO L87 Difference]: Start difference. First operand 220 states and 222 transitions. Second operand has 323 states, 323 states have (on average 1.0185758513931888) internal successors, (329), 322 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:21:55,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:21:55,178 INFO L93 Difference]: Finished difference Result 440 states and 551 transitions. [2023-12-02 19:21:55,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 216 states. [2023-12-02 19:21:55,179 INFO L78 Accepts]: Start accepts. Automaton has has 323 states, 323 states have (on average 1.0185758513931888) internal successors, (329), 322 states have internal predecessors, (329), 0 states have call successors, (0), 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 218 [2023-12-02 19:21:55,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:21:55,181 INFO L225 Difference]: With dead ends: 440 [2023-12-02 19:21:55,181 INFO L226 Difference]: Without dead ends: 328 [2023-12-02 19:21:55,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 760 GetRequests, 434 SyntacticMatches, 0 SemanticMatches, 326 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48139 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=46458, Invalid=60798, Unknown=0, NotChecked=0, Total=107256 [2023-12-02 19:21:55,192 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 3 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:21:55,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 25 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:21:55,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2023-12-02 19:21:55,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 328. [2023-12-02 19:21:55,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 1.0091743119266054) internal successors, (330), 327 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:21:55,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 330 transitions. [2023-12-02 19:21:55,230 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 330 transitions. Word has length 218 [2023-12-02 19:21:55,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:21:55,230 INFO L495 AbstractCegarLoop]: Abstraction has 328 states and 330 transitions. [2023-12-02 19:21:55,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 323 states, 323 states have (on average 1.0185758513931888) internal successors, (329), 322 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:21:55,231 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 330 transitions. [2023-12-02 19:21:55,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2023-12-02 19:21:55,237 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:21:55,237 INFO L195 NwaCegarLoop]: trace histogram [214, 106, 1, 1, 1, 1, 1, 1] [2023-12-02 19:21:55,245 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 19:21:55,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:21:55,438 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:21:55,438 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:21:55,438 INFO L85 PathProgramCache]: Analyzing trace with hash -916344820, now seen corresponding path program 8 times [2023-12-02 19:21:55,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:21:55,439 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285335058] [2023-12-02 19:21:55,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:21:55,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:21:56,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:22:29,647 INFO L134 CoverageAnalysis]: Checked inductivity of 28676 backedges. 0 proven. 23005 refuted. 0 times theorem prover too weak. 5671 trivial. 0 not checked. [2023-12-02 19:22:29,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:22:29,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285335058] [2023-12-02 19:22:29,647 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285335058] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:22:29,647 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297524180] [2023-12-02 19:22:29,647 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:22:29,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:22:29,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:22:29,648 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:22:29,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a574b878-30a9-49ed-868b-cc2afe480f43/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process