./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4fc63b2a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2 --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 c3e4caaff40cd418d8c93f0410c37d1e421cc5f90c41578bfaa7bb16ff289f1e --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4fc63b2 [2024-11-02 12:23:55,552 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-02 12:23:55,636 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-02 12:23:55,641 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-02 12:23:55,641 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-02 12:23:55,667 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-02 12:23:55,668 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-02 12:23:55,668 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-02 12:23:55,671 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-02 12:23:55,672 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-02 12:23:55,674 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-02 12:23:55,674 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-02 12:23:55,675 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-02 12:23:55,675 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-02 12:23:55,676 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-02 12:23:55,680 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-02 12:23:55,680 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-02 12:23:55,681 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-02 12:23:55,681 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-02 12:23:55,682 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-02 12:23:55,682 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-02 12:23:55,683 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-02 12:23:55,683 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-02 12:23:55,684 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-02 12:23:55,705 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-02 12:23:55,706 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-02 12:23:55,706 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-02 12:23:55,707 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-02 12:23:55,707 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-02 12:23:55,708 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-02 12:23:55,708 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-02 12:23:55,708 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-02 12:23:55,709 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-02 12:23:55,710 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-02 12:23:55,710 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-02 12:23:55,711 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-02 12:23:55,711 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-02 12:23:55,712 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-02 12:23:55,712 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:23:55,712 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-02 12:23:55,713 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-02 12:23:55,713 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-02 12:23:55,713 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-02 12:23:55,713 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-02 12:23:55,714 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-02 12:23:55,714 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-02 12:23:55,714 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-02 12:23:55,714 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_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c3e4caaff40cd418d8c93f0410c37d1e421cc5f90c41578bfaa7bb16ff289f1e [2024-11-02 12:23:56,019 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-02 12:23:56,062 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-02 12:23:56,066 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-02 12:23:56,069 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-02 12:23:56,070 INFO L274 PluginConnector]: CDTParser initialized [2024-11-02 12:23:56,071 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c Unable to find full path for "g++" [2024-11-02 12:23:58,074 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-02 12:23:58,276 INFO L384 CDTParser]: Found 1 translation units. [2024-11-02 12:23:58,277 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c [2024-11-02 12:23:58,287 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/data/5416897b5/9db016d759764e8abc1bdb9a77dbcd0a/FLAG0540f627d [2024-11-02 12:23:58,715 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/data/5416897b5/9db016d759764e8abc1bdb9a77dbcd0a [2024-11-02 12:23:58,718 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-02 12:23:58,722 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-02 12:23:58,727 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-02 12:23:58,728 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-02 12:23:58,739 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-02 12:23:58,742 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:23:58" (1/1) ... [2024-11-02 12:23:58,743 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@419e518a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:58, skipping insertion in model container [2024-11-02 12:23:58,743 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:23:58" (1/1) ... [2024-11-02 12:23:58,793 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-02 12:23:58,989 WARN L251 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_6d55d26e-9b44-4253-a091-9f1006f719e1/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c[490,503] [2024-11-02 12:23:59,012 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:23:59,023 INFO L200 MainTranslator]: Completed pre-run [2024-11-02 12:23:59,033 WARN L251 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_6d55d26e-9b44-4253-a091-9f1006f719e1/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c[490,503] [2024-11-02 12:23:59,043 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:23:59,063 INFO L204 MainTranslator]: Completed translation [2024-11-02 12:23:59,064 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59 WrapperNode [2024-11-02 12:23:59,064 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-02 12:23:59,066 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-02 12:23:59,066 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-02 12:23:59,066 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-02 12:23:59,075 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,080 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,099 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 83 [2024-11-02 12:23:59,099 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-02 12:23:59,100 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-02 12:23:59,100 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-02 12:23:59,100 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-02 12:23:59,110 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,111 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,112 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,112 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,116 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,120 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,121 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,122 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,124 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-02 12:23:59,125 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-02 12:23:59,125 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-02 12:23:59,126 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-02 12:23:59,127 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (1/1) ... [2024-11-02 12:23:59,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:23:59,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:23:59,181 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-02 12:23:59,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-02 12:23:59,220 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-02 12:23:59,220 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-11-02 12:23:59,221 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-11-02 12:23:59,222 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-02 12:23:59,222 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-02 12:23:59,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-02 12:23:59,223 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-11-02 12:23:59,224 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-11-02 12:23:59,300 INFO L238 CfgBuilder]: Building ICFG [2024-11-02 12:23:59,303 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-02 12:23:59,557 INFO L? ?]: Removed 6 outVars from TransFormulas that were not future-live. [2024-11-02 12:23:59,558 INFO L287 CfgBuilder]: Performing block encoding [2024-11-02 12:23:59,612 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-02 12:23:59,612 INFO L316 CfgBuilder]: Removed 3 assume(true) statements. [2024-11-02 12:23:59,613 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:23:59 BoogieIcfgContainer [2024-11-02 12:23:59,617 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-02 12:23:59,619 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-02 12:23:59,619 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-02 12:23:59,625 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-02 12:23:59,625 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 12:23:58" (1/3) ... [2024-11-02 12:23:59,627 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58cde12d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:23:59, skipping insertion in model container [2024-11-02 12:23:59,627 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:23:59" (2/3) ... [2024-11-02 12:23:59,627 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58cde12d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:23:59, skipping insertion in model container [2024-11-02 12:23:59,628 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:23:59" (3/3) ... [2024-11-02 12:23:59,630 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound100.c [2024-11-02 12:23:59,649 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-02 12:23:59,649 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-02 12:23:59,703 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-02 12:23:59,709 INFO L333 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@75531f69, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-02 12:23:59,709 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-02 12:23:59,713 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2024-11-02 12:23:59,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2024-11-02 12:23:59,720 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:23:59,721 INFO L215 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:23:59,721 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:23:59,726 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:23:59,727 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2024-11-02 12:23:59,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:23:59,738 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340695064] [2024-11-02 12:23:59,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:23:59,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:23:59,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:23:59,906 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:23:59,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:23:59,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340695064] [2024-11-02 12:23:59,908 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [340695064] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:23:59,908 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:23:59,908 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-02 12:23:59,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132939145] [2024-11-02 12:23:59,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:23:59,917 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-11-02 12:23:59,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:23:59,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-11-02 12:23:59,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-02 12:23:59,944 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-02 12:23:59,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:23:59,985 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2024-11-02 12:23:59,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-11-02 12:23:59,991 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2024-11-02 12:23:59,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:23:59,999 INFO L225 Difference]: With dead ends: 51 [2024-11-02 12:23:59,999 INFO L226 Difference]: Without dead ends: 28 [2024-11-02 12:24:00,001 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-02 12:24:00,005 INFO L432 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:24:00,007 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:24:00,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-02 12:24:00,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2024-11-02 12:24:00,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2024-11-02 12:24:00,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2024-11-02 12:24:00,051 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2024-11-02 12:24:00,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:24:00,053 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2024-11-02 12:24:00,054 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-02 12:24:00,054 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2024-11-02 12:24:00,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-02 12:24:00,056 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:24:00,056 INFO L215 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:24:00,056 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-02 12:24:00,057 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:24:00,058 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:24:00,058 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2024-11-02 12:24:00,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:24:00,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532194540] [2024-11-02 12:24:00,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:00,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:24:00,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:24:00,354 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-02 12:24:00,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:24:00,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532194540] [2024-11-02 12:24:00,355 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532194540] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:24:00,355 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:24:00,355 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-02 12:24:00,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774624564] [2024-11-02 12:24:00,355 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:24:00,356 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 12:24:00,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:24:00,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 12:24:00,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:24:00,358 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-02 12:24:00,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:24:00,473 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2024-11-02 12:24:00,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 12:24:00,474 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2024-11-02 12:24:00,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:24:00,476 INFO L225 Difference]: With dead ends: 47 [2024-11-02 12:24:00,476 INFO L226 Difference]: Without dead ends: 40 [2024-11-02 12:24:00,477 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-02 12:24:00,478 INFO L432 NwaCegarLoop]: 26 mSDtfsCounter, 30 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:24:00,479 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 87 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:24:00,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2024-11-02 12:24:00,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2024-11-02 12:24:00,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2024-11-02 12:24:00,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2024-11-02 12:24:00,491 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2024-11-02 12:24:00,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:24:00,491 INFO L471 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2024-11-02 12:24:00,492 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-02 12:24:00,492 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2024-11-02 12:24:00,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-11-02 12:24:00,493 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:24:00,493 INFO L215 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:24:00,493 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-02 12:24:00,494 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:24:00,494 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:24:00,494 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2024-11-02 12:24:00,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:24:00,495 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063817010] [2024-11-02 12:24:00,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:00,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:24:00,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 12:24:00,535 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1484871022] [2024-11-02 12:24:00,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:00,536 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:24:00,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:24:00,540 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:24:00,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-02 12:24:00,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:24:00,608 INFO L255 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjuncts are in the unsatisfiable core [2024-11-02 12:24:00,615 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:24:00,825 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:24:00,826 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:24:00,826 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:24:00,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063817010] [2024-11-02 12:24:00,827 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 12:24:00,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484871022] [2024-11-02 12:24:00,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484871022] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:24:00,828 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:24:00,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-02 12:24:00,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555212368] [2024-11-02 12:24:00,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:24:00,832 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 12:24:00,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:24:00,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 12:24:00,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:24:00,833 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-02 12:24:00,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:24:00,933 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2024-11-02 12:24:00,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 12:24:00,934 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2024-11-02 12:24:00,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:24:00,936 INFO L225 Difference]: With dead ends: 46 [2024-11-02 12:24:00,936 INFO L226 Difference]: Without dead ends: 44 [2024-11-02 12:24:00,936 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-02 12:24:00,937 INFO L432 NwaCegarLoop]: 30 mSDtfsCounter, 7 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:24:00,940 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 115 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:24:00,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2024-11-02 12:24:00,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2024-11-02 12:24:00,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2024-11-02 12:24:00,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2024-11-02 12:24:00,953 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2024-11-02 12:24:00,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:24:00,954 INFO L471 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2024-11-02 12:24:00,954 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-02 12:24:00,954 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2024-11-02 12:24:00,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-11-02 12:24:00,955 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:24:00,955 INFO L215 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:24:00,976 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-02 12:24:01,160 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2024-11-02 12:24:01,160 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:24:01,161 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:24:01,161 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2024-11-02 12:24:01,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:24:01,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41089891] [2024-11-02 12:24:01,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:01,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:24:01,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:24:01,422 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-02 12:24:01,422 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:24:01,422 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41089891] [2024-11-02 12:24:01,422 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41089891] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:24:01,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74358257] [2024-11-02 12:24:01,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:01,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:24:01,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:24:01,427 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:24:01,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-02 12:24:01,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:24:01,492 INFO L255 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-02 12:24:01,494 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:24:01,542 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-02 12:24:01,542 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:24:01,655 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-02 12:24:01,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [74358257] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:24:01,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1710201178] [2024-11-02 12:24:01,692 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2024-11-02 12:24:01,693 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:24:01,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:24:01,707 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:24:01,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:24:02,980 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-02 12:24:02,983 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:24:04,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1710201178] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:24:04,112 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:24:04,112 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7, 7] total 18 [2024-11-02 12:24:04,113 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287066593] [2024-11-02 12:24:04,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:24:04,113 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2024-11-02 12:24:04,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:24:04,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2024-11-02 12:24:04,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2024-11-02 12:24:04,115 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-02 12:24:04,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:24:04,441 INFO L93 Difference]: Finished difference Result 81 states and 113 transitions. [2024-11-02 12:24:04,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-02 12:24:04,442 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2024-11-02 12:24:04,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:24:04,444 INFO L225 Difference]: With dead ends: 81 [2024-11-02 12:24:04,444 INFO L226 Difference]: Without dead ends: 74 [2024-11-02 12:24:04,445 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2024-11-02 12:24:04,446 INFO L432 NwaCegarLoop]: 19 mSDtfsCounter, 72 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-02 12:24:04,447 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 45 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-02 12:24:04,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2024-11-02 12:24:04,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 50. [2024-11-02 12:24:04,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2024-11-02 12:24:04,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2024-11-02 12:24:04,482 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2024-11-02 12:24:04,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:24:04,482 INFO L471 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2024-11-02 12:24:04,482 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-02 12:24:04,483 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2024-11-02 12:24:04,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2024-11-02 12:24:04,483 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:24:04,484 INFO L215 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:24:04,506 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-02 12:24:04,684 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2024-11-02 12:24:04,685 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:24:04,685 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:24:04,685 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2024-11-02 12:24:04,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:24:04,686 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902317014] [2024-11-02 12:24:04,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:04,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:24:04,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 12:24:04,703 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [641126682] [2024-11-02 12:24:04,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:04,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:24:04,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:24:04,706 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:24:04,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-02 12:24:04,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:24:04,759 INFO L255 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 9 conjuncts are in the unsatisfiable core [2024-11-02 12:24:04,761 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:24:04,836 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:24:04,836 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:24:04,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:24:04,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902317014] [2024-11-02 12:24:04,837 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 12:24:04,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641126682] [2024-11-02 12:24:04,837 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641126682] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:24:04,837 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:24:04,838 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-02 12:24:04,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837546097] [2024-11-02 12:24:04,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:24:04,838 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 12:24:04,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:24:04,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 12:24:04,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 12:24:04,840 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2024-11-02 12:24:04,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:24:04,925 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2024-11-02 12:24:04,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 12:24:04,926 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 29 [2024-11-02 12:24:04,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:24:04,927 INFO L225 Difference]: With dead ends: 58 [2024-11-02 12:24:04,927 INFO L226 Difference]: Without dead ends: 56 [2024-11-02 12:24:04,928 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-02 12:24:04,929 INFO L432 NwaCegarLoop]: 31 mSDtfsCounter, 7 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:24:04,930 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 112 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:24:04,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2024-11-02 12:24:04,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2024-11-02 12:24:04,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 37 states have internal predecessors, (44), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2024-11-02 12:24:04,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2024-11-02 12:24:04,962 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 29 [2024-11-02 12:24:04,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:24:04,963 INFO L471 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2024-11-02 12:24:04,963 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2024-11-02 12:24:04,964 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2024-11-02 12:24:04,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2024-11-02 12:24:04,965 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:24:04,965 INFO L215 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:24:04,985 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-02 12:24:05,169 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:24:05,171 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:24:05,171 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:24:05,175 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2024-11-02 12:24:05,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:24:05,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253126091] [2024-11-02 12:24:05,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:05,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:24:05,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 12:24:05,208 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1354006838] [2024-11-02 12:24:05,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:05,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:24:05,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:24:05,211 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:24:05,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-02 12:24:05,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:24:05,271 INFO L255 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 19 conjuncts are in the unsatisfiable core [2024-11-02 12:24:05,272 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:24:05,405 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:24:05,405 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:24:05,527 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:24:05,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:24:05,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253126091] [2024-11-02 12:24:05,528 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 12:24:05,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354006838] [2024-11-02 12:24:05,529 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354006838] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:24:05,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1141258886] [2024-11-02 12:24:05,532 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2024-11-02 12:24:05,532 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:24:05,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:24:05,533 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:24:05,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:24:06,281 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 84 for LOIs [2024-11-02 12:24:06,390 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-02 12:24:06,392 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:24:08,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1141258886] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:24:08,558 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2024-11-02 12:24:08,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [7, 6] total 23 [2024-11-02 12:24:08,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029983867] [2024-11-02 12:24:08,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:24:08,559 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2024-11-02 12:24:08,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:24:08,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2024-11-02 12:24:08,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2024-11-02 12:24:08,562 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-02 12:24:09,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:24:09,221 INFO L93 Difference]: Finished difference Result 98 states and 138 transitions. [2024-11-02 12:24:09,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-02 12:24:09,222 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2024-11-02 12:24:09,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:24:09,224 INFO L225 Difference]: With dead ends: 98 [2024-11-02 12:24:09,227 INFO L226 Difference]: Without dead ends: 96 [2024-11-02 12:24:09,228 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2024-11-02 12:24:09,229 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 64 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-02 12:24:09,229 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 63 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-02 12:24:09,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2024-11-02 12:24:09,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 89. [2024-11-02 12:24:09,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 50 states have (on average 1.24) internal successors, (62), 53 states have internal predecessors, (62), 33 states have call successors, (33), 5 states have call predecessors, (33), 5 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2024-11-02 12:24:09,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 127 transitions. [2024-11-02 12:24:09,284 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 127 transitions. Word has length 29 [2024-11-02 12:24:09,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:24:09,285 INFO L471 AbstractCegarLoop]: Abstraction has 89 states and 127 transitions. [2024-11-02 12:24:09,285 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-02 12:24:09,285 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 127 transitions. [2024-11-02 12:24:09,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2024-11-02 12:24:09,287 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:24:09,287 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:24:09,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-02 12:24:09,491 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:24:09,491 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:24:09,492 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:24:09,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2024-11-02 12:24:09,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:24:09,492 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201618126] [2024-11-02 12:24:09,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:09,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:24:09,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 12:24:09,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1171350889] [2024-11-02 12:24:09,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:09,517 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:24:09,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:24:09,519 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:24:09,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-02 12:24:09,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:24:09,593 INFO L255 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 49 conjuncts are in the unsatisfiable core [2024-11-02 12:24:09,596 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:24:10,353 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2024-11-02 12:24:10,354 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:24:11,767 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-02 12:24:11,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:24:11,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201618126] [2024-11-02 12:24:11,768 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 12:24:11,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1171350889] [2024-11-02 12:24:11,768 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1171350889] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:24:11,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1897263860] [2024-11-02 12:24:11,771 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2024-11-02 12:24:11,771 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:24:11,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:24:11,772 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:24:11,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:24:17,540 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-02 12:24:17,544 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-02 12:24:17,546 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:24:19,123 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1953#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-02 12:24:19,123 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:24:19,123 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-02 12:24:19,123 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2024-11-02 12:24:19,123 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305463353] [2024-11-02 12:24:19,124 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-02 12:24:19,124 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2024-11-02 12:24:19,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:24:19,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2024-11-02 12:24:19,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1258, Unknown=0, NotChecked=0, Total=1406 [2024-11-02 12:24:19,126 INFO L87 Difference]: Start difference. First operand 89 states and 127 transitions. Second operand has 22 states, 19 states have (on average 2.0) internal successors, (38), 19 states have internal predecessors, (38), 6 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2024-11-02 12:24:24,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:24:24,022 INFO L93 Difference]: Finished difference Result 277 states and 410 transitions. [2024-11-02 12:24:24,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2024-11-02 12:24:24,023 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 2.0) internal successors, (38), 19 states have internal predecessors, (38), 6 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 51 [2024-11-02 12:24:24,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:24:24,027 INFO L225 Difference]: With dead ends: 277 [2024-11-02 12:24:24,028 INFO L226 Difference]: Without dead ends: 239 [2024-11-02 12:24:24,030 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 951 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=480, Invalid=3180, Unknown=0, NotChecked=0, Total=3660 [2024-11-02 12:24:24,031 INFO L432 NwaCegarLoop]: 26 mSDtfsCounter, 163 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2024-11-02 12:24:24,031 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 337 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2024-11-02 12:24:24,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2024-11-02 12:24:24,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 167. [2024-11-02 12:24:24,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 106 states have (on average 1.2547169811320755) internal successors, (133), 108 states have internal predecessors, (133), 53 states have call successors, (53), 7 states have call predecessors, (53), 7 states have return successors, (52), 51 states have call predecessors, (52), 52 states have call successors, (52) [2024-11-02 12:24:24,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 238 transitions. [2024-11-02 12:24:24,188 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 238 transitions. Word has length 51 [2024-11-02 12:24:24,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:24:24,189 INFO L471 AbstractCegarLoop]: Abstraction has 167 states and 238 transitions. [2024-11-02 12:24:24,189 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 2.0) internal successors, (38), 19 states have internal predecessors, (38), 6 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2024-11-02 12:24:24,189 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 238 transitions. [2024-11-02 12:24:24,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2024-11-02 12:24:24,196 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:24:24,196 INFO L215 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:24:24,220 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-02 12:24:24,396 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-02 12:24:24,397 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:24:24,398 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:24:24,398 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2024-11-02 12:24:24,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:24:24,399 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791038184] [2024-11-02 12:24:24,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:24,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:24:24,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 12:24:24,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1996296412] [2024-11-02 12:24:24,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:24,446 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:24:24,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:24:24,448 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:24:24,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-02 12:24:24,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:24:24,522 INFO L255 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 11 conjuncts are in the unsatisfiable core [2024-11-02 12:24:24,525 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:24:24,617 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2024-11-02 12:24:24,617 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:24:24,694 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2024-11-02 12:24:24,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:24:24,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791038184] [2024-11-02 12:24:24,695 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 12:24:24,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996296412] [2024-11-02 12:24:24,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996296412] provided 1 perfect and 1 imperfect interpolant sequences [2024-11-02 12:24:24,695 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:24:24,695 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2024-11-02 12:24:24,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004873553] [2024-11-02 12:24:24,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:24:24,696 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 12:24:24,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:24:24,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 12:24:24,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2024-11-02 12:24:24,697 INFO L87 Difference]: Start difference. First operand 167 states and 238 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2024-11-02 12:24:24,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:24:24,845 INFO L93 Difference]: Finished difference Result 181 states and 249 transitions. [2024-11-02 12:24:24,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 12:24:24,845 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 61 [2024-11-02 12:24:24,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:24:24,848 INFO L225 Difference]: With dead ends: 181 [2024-11-02 12:24:24,848 INFO L226 Difference]: Without dead ends: 179 [2024-11-02 12:24:24,849 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2024-11-02 12:24:24,850 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 4 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:24:24,850 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 108 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:24:24,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2024-11-02 12:24:24,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2024-11-02 12:24:24,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 115 states have (on average 1.2347826086956522) internal successors, (142), 117 states have internal predecessors, (142), 53 states have call successors, (53), 10 states have call predecessors, (53), 10 states have return successors, (52), 51 states have call predecessors, (52), 52 states have call successors, (52) [2024-11-02 12:24:24,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 247 transitions. [2024-11-02 12:24:24,965 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 247 transitions. Word has length 61 [2024-11-02 12:24:24,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:24:24,966 INFO L471 AbstractCegarLoop]: Abstraction has 179 states and 247 transitions. [2024-11-02 12:24:24,966 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2024-11-02 12:24:24,966 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 247 transitions. [2024-11-02 12:24:24,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2024-11-02 12:24:24,968 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:24:24,969 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:24:24,990 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-02 12:24:25,173 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2024-11-02 12:24:25,173 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:24:25,174 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:24:25,174 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 1 times [2024-11-02 12:24:25,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:24:25,174 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192853033] [2024-11-02 12:24:25,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:25,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:24:25,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-02 12:24:25,200 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1547654912] [2024-11-02 12:24:25,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:24:25,200 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:24:25,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:24:25,202 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:24:25,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d55d26e-9b44-4253-a091-9f1006f719e1/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-02 12:24:25,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:24:25,281 INFO L255 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 46 conjuncts are in the unsatisfiable core [2024-11-02 12:24:25,285 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:24:25,947 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 12 proven. 29 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2024-11-02 12:24:25,947 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:24:26,221 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2024-11-02 12:24:26,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:24:26,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192853033] [2024-11-02 12:24:26,221 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-02 12:24:26,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547654912] [2024-11-02 12:24:26,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547654912] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:24:26,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1414207822] [2024-11-02 12:24:26,224 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-02 12:24:26,224 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:24:26,225 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:24:26,225 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:24:26,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs