./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc 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_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f57f8b833105028fdf95b78a3cf338388755f00064f1be1e7a158d1da7dbd5a2 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:00:37,024 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:00:37,087 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 14:00:37,091 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:00:37,091 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:00:37,115 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:00:37,116 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:00:37,116 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:00:37,117 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:00:37,117 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:00:37,118 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:00:37,118 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:00:37,119 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:00:37,119 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:00:37,120 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:00:37,120 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:00:37,121 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:00:37,121 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:00:37,122 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:00:37,123 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:00:37,123 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:00:37,124 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:00:37,125 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:00:37,125 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:00:37,126 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:00:37,126 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:00:37,127 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:00:37,127 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:00:37,128 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:00:37,128 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:00:37,129 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:00:37,129 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:00:37,129 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:00:37,130 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:00:37,130 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:00:37,130 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:00:37,130 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:00:37,130 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:00:37,131 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:00:37,131 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:00:37,131 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:00:37,131 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:00:37,132 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:00:37,132 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:00:37,132 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:00:37,132 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:00:37,132 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:00:37,132 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_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f57f8b833105028fdf95b78a3cf338388755f00064f1be1e7a158d1da7dbd5a2 [2023-12-02 14:00:37,329 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:00:37,351 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:00:37,353 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:00:37,354 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:00:37,355 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:00:37,356 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c [2023-12-02 14:00:40,137 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:00:40,297 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:00:40,297 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c [2023-12-02 14:00:40,304 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/data/0d42cd586/d2a0f36dd072407bb84d21fde377d540/FLAGa98ea2a26 [2023-12-02 14:00:40,316 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/data/0d42cd586/d2a0f36dd072407bb84d21fde377d540 [2023-12-02 14:00:40,319 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:00:40,320 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:00:40,321 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:00:40,321 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:00:40,325 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:00:40,326 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,327 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c42b70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40, skipping insertion in model container [2023-12-02 14:00:40,327 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,352 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:00:40,490 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c[2717,2730] [2023-12-02 14:00:40,495 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:00:40,505 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:00:40,528 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/sv-benchmarks/c/float-benchs/zonotope_3.c.p+cfa-reducer.c[2717,2730] [2023-12-02 14:00:40,531 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:00:40,546 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:00:40,546 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40 WrapperNode [2023-12-02 14:00:40,546 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:00:40,547 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:00:40,547 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:00:40,547 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:00:40,555 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,563 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,581 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 126 [2023-12-02 14:00:40,581 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:00:40,582 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:00:40,582 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:00:40,583 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:00:40,592 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,592 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,594 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,594 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,599 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,601 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,603 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,604 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,606 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:00:40,607 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:00:40,607 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:00:40,607 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:00:40,608 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (1/1) ... [2023-12-02 14:00:40,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:00:40,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:00:40,645 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:00:40,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:00:40,679 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:00:40,679 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:00:40,679 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:00:40,679 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:00:40,753 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:00:40,756 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:00:40,878 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:00:40,905 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:00:40,905 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-12-02 14:00:40,907 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:00:40 BoogieIcfgContainer [2023-12-02 14:00:40,907 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:00:40,910 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:00:40,910 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:00:40,913 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:00:40,914 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:00:40" (1/3) ... [2023-12-02 14:00:40,914 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73ee73bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:00:40, skipping insertion in model container [2023-12-02 14:00:40,914 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:00:40" (2/3) ... [2023-12-02 14:00:40,915 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73ee73bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:00:40, skipping insertion in model container [2023-12-02 14:00:40,915 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:00:40" (3/3) ... [2023-12-02 14:00:40,916 INFO L112 eAbstractionObserver]: Analyzing ICFG zonotope_3.c.p+cfa-reducer.c [2023-12-02 14:00:40,933 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:00:40,934 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 14:00:40,971 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:00:40,977 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@6e9c996f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:00:40,977 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 14:00:40,981 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:40,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 14:00:40,986 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:00:40,987 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:00:40,987 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:00:40,991 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:00:40,991 INFO L85 PathProgramCache]: Analyzing trace with hash 532985016, now seen corresponding path program 1 times [2023-12-02 14:00:41,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:00:41,001 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895795343] [2023-12-02 14:00:41,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:41,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:00:41,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:41,195 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:41,196 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:00:41,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895795343] [2023-12-02 14:00:41,197 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [895795343] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:00:41,197 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:00:41,197 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 14:00:41,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015230708] [2023-12-02 14:00:41,200 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:00:41,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:00:41,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:00:41,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:00:41,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:00:41,235 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:41,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:00:41,265 INFO L93 Difference]: Finished difference Result 30 states and 42 transitions. [2023-12-02 14:00:41,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:00:41,267 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 14:00:41,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:00:41,274 INFO L225 Difference]: With dead ends: 30 [2023-12-02 14:00:41,274 INFO L226 Difference]: Without dead ends: 18 [2023-12-02 14:00:41,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:00:41,281 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:00:41,282 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 31 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:00:41,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-12-02 14:00:41,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 14. [2023-12-02 14:00:41,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:41,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2023-12-02 14:00:41,307 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 7 [2023-12-02 14:00:41,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:00:41,308 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2023-12-02 14:00:41,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:41,308 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2023-12-02 14:00:41,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 14:00:41,309 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:00:41,309 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:00:41,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 14:00:41,309 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:00:41,310 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:00:41,310 INFO L85 PathProgramCache]: Analyzing trace with hash -1155032636, now seen corresponding path program 1 times [2023-12-02 14:00:41,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:00:41,311 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755117746] [2023-12-02 14:00:41,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:41,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:00:41,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:41,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:41,363 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:00:41,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755117746] [2023-12-02 14:00:41,363 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755117746] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:00:41,364 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:00:41,364 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:00:41,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817848670] [2023-12-02 14:00:41,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:00:41,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:00:41,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:00:41,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:00:41,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:00:41,367 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:41,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:00:41,378 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2023-12-02 14:00:41,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:00:41,379 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 14:00:41,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:00:41,380 INFO L225 Difference]: With dead ends: 27 [2023-12-02 14:00:41,380 INFO L226 Difference]: Without dead ends: 13 [2023-12-02 14:00:41,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:00:41,382 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:00:41,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:00:41,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-12-02 14:00:41,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-12-02 14:00:41,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:41,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2023-12-02 14:00:41,386 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 11 [2023-12-02 14:00:41,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:00:41,386 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2023-12-02 14:00:41,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:41,387 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2023-12-02 14:00:41,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 14:00:41,387 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:00:41,387 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:00:41,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 14:00:41,388 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:00:41,388 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:00:41,388 INFO L85 PathProgramCache]: Analyzing trace with hash -61253633, now seen corresponding path program 1 times [2023-12-02 14:00:41,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:00:41,389 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460180196] [2023-12-02 14:00:41,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:41,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:00:41,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:41,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:41,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:00:41,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460180196] [2023-12-02 14:00:41,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460180196] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:00:41,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142429856] [2023-12-02 14:00:41,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:41,466 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:41,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:00:41,468 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:00:41,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:00:41,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:41,555 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:00:41,560 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:00:41,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:41,603 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:00:41,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:41,631 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1142429856] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:00:41,631 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [381622594] [2023-12-02 14:00:41,651 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:00:41,651 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:00:41,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:00:41,658 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:00:41,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:00:42,484 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:00:43,224 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [381622594] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:00:43,224 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:00:43,224 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 12 [2023-12-02 14:00:43,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102313210] [2023-12-02 14:00:43,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:00:43,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 14:00:43,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:00:43,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 14:00:43,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:00:43,228 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:43,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:00:43,433 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2023-12-02 14:00:43,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 14:00:43,434 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 14:00:43,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:00:43,435 INFO L225 Difference]: With dead ends: 17 [2023-12-02 14:00:43,435 INFO L226 Difference]: Without dead ends: 13 [2023-12-02 14:00:43,435 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:00:43,437 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:00:43,437 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 16 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:00:43,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-12-02 14:00:43,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-12-02 14:00:43,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:43,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2023-12-02 14:00:43,441 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2023-12-02 14:00:43,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:00:43,441 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2023-12-02 14:00:43,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:43,442 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2023-12-02 14:00:43,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 14:00:43,442 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:00:43,442 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:00:43,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:00:43,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:43,647 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:00:43,647 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:00:43,648 INFO L85 PathProgramCache]: Analyzing trace with hash -44242972, now seen corresponding path program 1 times [2023-12-02 14:00:43,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:00:43,648 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618967758] [2023-12-02 14:00:43,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:43,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:00:43,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:43,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:43,705 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:00:43,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618967758] [2023-12-02 14:00:43,706 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618967758] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:00:43,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537948489] [2023-12-02 14:00:43,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:43,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:43,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:00:43,708 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:00:43,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:00:43,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:43,774 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:00:43,775 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:00:43,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:43,788 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:00:43,809 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:43,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537948489] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:00:43,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2038365821] [2023-12-02 14:00:43,812 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:00:43,812 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:00:43,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:00:43,813 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:00:43,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:00:44,419 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:00:45,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '280#(and (= |ULTIMATE.start_main_~f__x~0#1| 0.0) (<= 1 |#StackHeapBarrier|) (= ~__return_142~0 |ULTIMATE.start_main_~main__z~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| 0) (= |ULTIMATE.start_main_~__tmp_9~0#1| 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~f__x~3#1| |ULTIMATE.start_main_~__tmp_7~0#1|) (= |ULTIMATE.start_main_~g__x~2#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (= |ULTIMATE.start_main_~main__u~0#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (= ~__return_151~0 |ULTIMATE.start_main_~main____CPAchecker_TMP_1~0#1|) (= |ULTIMATE.start_main_~f__x~2#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= ~__return_136~0 |ULTIMATE.start_main_~main__y~0#1|) (= ~__return_146~0 |ULTIMATE.start_main_~main__u~0#1|) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_0~0#1| 1) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (<= 100001 |ULTIMATE.start_main_~main__i~0#1|) (= |ULTIMATE.start_main_~g__x~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~g__x~3#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= ~__return_main~0 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|))' at error location [2023-12-02 14:00:45,081 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:00:45,081 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:00:45,081 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-12-02 14:00:45,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595024277] [2023-12-02 14:00:45,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:00:45,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:00:45,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:00:45,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:00:45,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:00:45,083 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:45,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:00:45,110 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2023-12-02 14:00:45,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:00:45,111 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 14:00:45,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:00:45,111 INFO L225 Difference]: With dead ends: 32 [2023-12-02 14:00:45,111 INFO L226 Difference]: Without dead ends: 25 [2023-12-02 14:00:45,112 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:00:45,113 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:00:45,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 30 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:00:45,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-12-02 14:00:45,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-12-02 14:00:45,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:45,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2023-12-02 14:00:45,118 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 11 [2023-12-02 14:00:45,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:00:45,118 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2023-12-02 14:00:45,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:45,119 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2023-12-02 14:00:45,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 14:00:45,119 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:00:45,120 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:00:45,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:00:45,320 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:45,320 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:00:45,321 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:00:45,321 INFO L85 PathProgramCache]: Analyzing trace with hash 1495002297, now seen corresponding path program 2 times [2023-12-02 14:00:45,321 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:00:45,321 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309878726] [2023-12-02 14:00:45,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:45,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:00:45,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:45,439 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:45,439 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:00:45,439 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309878726] [2023-12-02 14:00:45,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309878726] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:00:45,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613974941] [2023-12-02 14:00:45,440 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:00:45,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:45,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:00:45,441 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:00:45,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:00:45,515 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 14:00:45,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:00:45,516 INFO L262 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:00:45,518 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:00:45,550 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:45,550 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:00:45,621 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:45,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613974941] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:00:45,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851983708] [2023-12-02 14:00:45,624 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:00:45,624 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:00:45,624 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:00:45,624 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:00:45,624 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:00:46,141 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:00:46,615 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '488#(and (= |ULTIMATE.start_main_~f__x~0#1| 0.0) (<= 1 |#StackHeapBarrier|) (= ~__return_142~0 |ULTIMATE.start_main_~main__z~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| 0) (= |ULTIMATE.start_main_~__tmp_9~0#1| 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~f__x~3#1| |ULTIMATE.start_main_~__tmp_7~0#1|) (= |ULTIMATE.start_main_~g__x~2#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (= |ULTIMATE.start_main_~main__u~0#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (= ~__return_151~0 |ULTIMATE.start_main_~main____CPAchecker_TMP_1~0#1|) (= |ULTIMATE.start_main_~f__x~2#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= ~__return_136~0 |ULTIMATE.start_main_~main__y~0#1|) (= ~__return_146~0 |ULTIMATE.start_main_~main__u~0#1|) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_0~0#1| 1) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (<= 100001 |ULTIMATE.start_main_~main__i~0#1|) (= |ULTIMATE.start_main_~g__x~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~g__x~3#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= ~__return_main~0 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|))' at error location [2023-12-02 14:00:46,615 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:00:46,615 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:00:46,615 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-12-02 14:00:46,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963494783] [2023-12-02 14:00:46,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:00:46,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 14:00:46,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:00:46,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 14:00:46,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:00:46,617 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:46,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:00:46,652 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2023-12-02 14:00:46,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 14:00:46,652 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-12-02 14:00:46,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:00:46,653 INFO L225 Difference]: With dead ends: 56 [2023-12-02 14:00:46,653 INFO L226 Difference]: Without dead ends: 49 [2023-12-02 14:00:46,653 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:00:46,654 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:00:46,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 35 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:00:46,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-12-02 14:00:46,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-12-02 14:00:46,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:46,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2023-12-02 14:00:46,659 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 23 [2023-12-02 14:00:46,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:00:46,659 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2023-12-02 14:00:46,659 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:46,659 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2023-12-02 14:00:46,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 14:00:46,661 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:00:46,661 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:00:46,665 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:00:46,861 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:46,862 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:00:46,862 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:00:46,862 INFO L85 PathProgramCache]: Analyzing trace with hash 429682659, now seen corresponding path program 3 times [2023-12-02 14:00:46,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:00:46,862 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246461124] [2023-12-02 14:00:46,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:46,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:00:46,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:47,114 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:47,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:00:47,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246461124] [2023-12-02 14:00:47,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246461124] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:00:47,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915251635] [2023-12-02 14:00:47,115 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:00:47,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:47,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:00:47,116 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:00:47,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:00:47,229 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:00:47,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:00:47,232 INFO L262 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:00:47,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:00:47,298 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:47,298 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:00:47,515 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:47,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915251635] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:00:47,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [375220205] [2023-12-02 14:00:47,518 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:00:47,518 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:00:47,518 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:00:47,519 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:00:47,519 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:00:47,900 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:00:48,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '900#(and (= |ULTIMATE.start_main_~f__x~0#1| 0.0) (<= 1 |#StackHeapBarrier|) (= ~__return_142~0 |ULTIMATE.start_main_~main__z~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| 0) (= |ULTIMATE.start_main_~__tmp_9~0#1| 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~f__x~3#1| |ULTIMATE.start_main_~__tmp_7~0#1|) (= |ULTIMATE.start_main_~g__x~2#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (= |ULTIMATE.start_main_~main__u~0#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (= ~__return_151~0 |ULTIMATE.start_main_~main____CPAchecker_TMP_1~0#1|) (= |ULTIMATE.start_main_~f__x~2#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= ~__return_136~0 |ULTIMATE.start_main_~main__y~0#1|) (= ~__return_146~0 |ULTIMATE.start_main_~main__u~0#1|) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_0~0#1| 1) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (<= 100001 |ULTIMATE.start_main_~main__i~0#1|) (= |ULTIMATE.start_main_~g__x~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~g__x~3#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= ~__return_main~0 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|))' at error location [2023-12-02 14:00:48,438 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:00:48,438 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:00:48,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-12-02 14:00:48,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606322794] [2023-12-02 14:00:48,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:00:48,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 14:00:48,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:00:48,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 14:00:48,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=604, Unknown=0, NotChecked=0, Total=930 [2023-12-02 14:00:48,442 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 25 states, 25 states have (on average 3.76) internal successors, (94), 24 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:48,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:00:48,505 INFO L93 Difference]: Finished difference Result 104 states and 117 transitions. [2023-12-02 14:00:48,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 14:00:48,506 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.76) internal successors, (94), 24 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2023-12-02 14:00:48,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:00:48,507 INFO L225 Difference]: With dead ends: 104 [2023-12-02 14:00:48,507 INFO L226 Difference]: Without dead ends: 97 [2023-12-02 14:00:48,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=326, Invalid=604, Unknown=0, NotChecked=0, Total=930 [2023-12-02 14:00:48,509 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:00:48,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 75 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:00:48,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-12-02 14:00:48,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2023-12-02 14:00:48,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.0208333333333333) internal successors, (98), 96 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:48,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2023-12-02 14:00:48,516 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 47 [2023-12-02 14:00:48,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:00:48,517 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2023-12-02 14:00:48,517 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.76) internal successors, (94), 24 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:48,517 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2023-12-02 14:00:48,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-12-02 14:00:48,520 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:00:48,520 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:00:48,525 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:00:48,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 14:00:48,721 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:00:48,721 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:00:48,721 INFO L85 PathProgramCache]: Analyzing trace with hash -665691081, now seen corresponding path program 4 times [2023-12-02 14:00:48,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:00:48,722 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207749133] [2023-12-02 14:00:48,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:48,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:00:48,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:49,442 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:49,442 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:00:49,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207749133] [2023-12-02 14:00:49,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207749133] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:00:49,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357919524] [2023-12-02 14:00:49,442 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:00:49,442 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:49,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:00:49,448 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:00:49,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:00:49,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:49,622 INFO L262 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 14:00:49,627 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:00:49,742 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:49,742 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:00:50,423 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:50,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357919524] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:00:50,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [726043745] [2023-12-02 14:00:50,425 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:00:50,425 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:00:50,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:00:50,426 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:00:50,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:00:50,836 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:00:51,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1720#(and (= |ULTIMATE.start_main_~f__x~0#1| 0.0) (<= 1 |#StackHeapBarrier|) (= ~__return_142~0 |ULTIMATE.start_main_~main__z~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| 0) (= |ULTIMATE.start_main_~__tmp_9~0#1| 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~f__x~3#1| |ULTIMATE.start_main_~__tmp_7~0#1|) (= |ULTIMATE.start_main_~g__x~2#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (= |ULTIMATE.start_main_~main__u~0#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (= ~__return_151~0 |ULTIMATE.start_main_~main____CPAchecker_TMP_1~0#1|) (= |ULTIMATE.start_main_~f__x~2#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= ~__return_136~0 |ULTIMATE.start_main_~main__y~0#1|) (= ~__return_146~0 |ULTIMATE.start_main_~main__u~0#1|) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_0~0#1| 1) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (<= 100001 |ULTIMATE.start_main_~main__i~0#1|) (= |ULTIMATE.start_main_~g__x~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~g__x~3#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= ~__return_main~0 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|))' at error location [2023-12-02 14:00:51,418 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:00:51,418 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:00:51,418 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2023-12-02 14:00:51,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516677598] [2023-12-02 14:00:51,418 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:00:51,419 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-12-02 14:00:51,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:00:51,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-12-02 14:00:51,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1202, Invalid=1768, Unknown=0, NotChecked=0, Total=2970 [2023-12-02 14:00:51,423 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 48 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:51,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:00:51,585 INFO L93 Difference]: Finished difference Result 200 states and 225 transitions. [2023-12-02 14:00:51,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-12-02 14:00:51,586 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 48 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2023-12-02 14:00:51,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:00:51,588 INFO L225 Difference]: With dead ends: 200 [2023-12-02 14:00:51,588 INFO L226 Difference]: Without dead ends: 193 [2023-12-02 14:00:51,590 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 254 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1202, Invalid=1768, Unknown=0, NotChecked=0, Total=2970 [2023-12-02 14:00:51,591 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:00:51,591 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 149 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:00:51,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2023-12-02 14:00:51,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2023-12-02 14:00:51,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.0104166666666667) internal successors, (194), 192 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:51,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 194 transitions. [2023-12-02 14:00:51,604 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 194 transitions. Word has length 95 [2023-12-02 14:00:51,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:00:51,605 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 194 transitions. [2023-12-02 14:00:51,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.877551020408163) internal successors, (190), 48 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:51,606 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 194 transitions. [2023-12-02 14:00:51,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2023-12-02 14:00:51,609 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:00:51,609 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:00:51,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 14:00:51,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:51,810 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:00:51,810 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:00:51,811 INFO L85 PathProgramCache]: Analyzing trace with hash 988400863, now seen corresponding path program 5 times [2023-12-02 14:00:51,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:00:51,811 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995278717] [2023-12-02 14:00:51,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:51,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:00:51,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:00:53,690 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:53,691 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:00:53,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995278717] [2023-12-02 14:00:53,691 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995278717] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:00:53,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028277344] [2023-12-02 14:00:53,691 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:00:53,691 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:53,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:00:53,692 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:00:53,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:00:54,053 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2023-12-02 14:00:54,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:00:54,059 INFO L262 TraceCheckSpWp]: Trace formula consists of 1540 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 14:00:54,068 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:00:54,251 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:54,251 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:00:56,560 INFO L134 CoverageAnalysis]: Checked inductivity of 4186 backedges. 0 proven. 4186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:00:56,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028277344] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:00:56,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1647273261] [2023-12-02 14:00:56,563 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:00:56,563 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:00:56,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:00:56,563 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:00:56,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:00:56,936 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:00:57,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3356#(and (= |ULTIMATE.start_main_~f__x~0#1| 0.0) (<= 1 |#StackHeapBarrier|) (= ~__return_142~0 |ULTIMATE.start_main_~main__z~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| 0) (= |ULTIMATE.start_main_~__tmp_9~0#1| 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~f__x~3#1| |ULTIMATE.start_main_~__tmp_7~0#1|) (= |ULTIMATE.start_main_~g__x~2#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (= |ULTIMATE.start_main_~main__u~0#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (= ~__return_151~0 |ULTIMATE.start_main_~main____CPAchecker_TMP_1~0#1|) (= |ULTIMATE.start_main_~f__x~2#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= ~__return_136~0 |ULTIMATE.start_main_~main__y~0#1|) (= ~__return_146~0 |ULTIMATE.start_main_~main__u~0#1|) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_0~0#1| 1) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (<= 100001 |ULTIMATE.start_main_~main__i~0#1|) (= |ULTIMATE.start_main_~g__x~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~g__x~3#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= ~__return_main~0 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|))' at error location [2023-12-02 14:00:57,659 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:00:57,660 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:00:57,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2023-12-02 14:00:57,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123399508] [2023-12-02 14:00:57,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:00:57,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-12-02 14:00:57,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:00:57,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-12-02 14:00:57,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4682, Invalid=5824, Unknown=0, NotChecked=0, Total=10506 [2023-12-02 14:00:57,667 INFO L87 Difference]: Start difference. First operand 193 states and 194 transitions. Second operand has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 96 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:58,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:00:58,045 INFO L93 Difference]: Finished difference Result 392 states and 441 transitions. [2023-12-02 14:00:58,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2023-12-02 14:00:58,046 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 96 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 191 [2023-12-02 14:00:58,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:00:58,049 INFO L225 Difference]: With dead ends: 392 [2023-12-02 14:00:58,049 INFO L226 Difference]: Without dead ends: 385 [2023-12-02 14:00:58,052 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 619 GetRequests, 518 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1035 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4682, Invalid=5824, Unknown=0, NotChecked=0, Total=10506 [2023-12-02 14:00:58,052 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:00:58,053 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 245 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:00:58,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2023-12-02 14:00:58,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 385. [2023-12-02 14:00:58,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 1.0052083333333333) internal successors, (386), 384 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:58,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 386 transitions. [2023-12-02 14:00:58,071 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 386 transitions. Word has length 191 [2023-12-02 14:00:58,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:00:58,072 INFO L495 AbstractCegarLoop]: Abstraction has 385 states and 386 transitions. [2023-12-02 14:00:58,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 3.9381443298969074) internal successors, (382), 96 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:00:58,072 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 386 transitions. [2023-12-02 14:00:58,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2023-12-02 14:00:58,081 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:00:58,081 INFO L195 NwaCegarLoop]: trace histogram [94, 94, 94, 94, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:00:58,089 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:00:58,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:00:58,282 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:00:58,282 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:00:58,282 INFO L85 PathProgramCache]: Analyzing trace with hash 394726959, now seen corresponding path program 6 times [2023-12-02 14:00:58,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:00:58,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534632483] [2023-12-02 14:00:58,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:00:58,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:00:58,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:01:04,469 INFO L134 CoverageAnalysis]: Checked inductivity of 17578 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:01:04,469 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:01:04,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534632483] [2023-12-02 14:01:04,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534632483] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:01:04,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139014044] [2023-12-02 14:01:04,470 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:01:04,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:01:04,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:01:04,471 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:01:04,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:01:04,972 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:01:04,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:01:04,988 INFO L262 TraceCheckSpWp]: Trace formula consists of 3076 conjuncts, 96 conjunts are in the unsatisfiable core [2023-12-02 14:01:05,002 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:01:05,492 INFO L134 CoverageAnalysis]: Checked inductivity of 17578 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:01:05,492 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:01:14,217 INFO L134 CoverageAnalysis]: Checked inductivity of 17578 backedges. 0 proven. 17578 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:01:14,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139014044] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:01:14,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1790276005] [2023-12-02 14:01:14,219 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:01:14,219 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:01:14,219 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:01:14,219 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:01:14,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:01:14,539 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:01:15,408 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6624#(and (= |ULTIMATE.start_main_~f__x~0#1| 0.0) (<= 1 |#StackHeapBarrier|) (= ~__return_142~0 |ULTIMATE.start_main_~main__z~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| 0) (= |ULTIMATE.start_main_~__tmp_9~0#1| 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~f__x~3#1| |ULTIMATE.start_main_~__tmp_7~0#1|) (= |ULTIMATE.start_main_~g__x~2#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (= |ULTIMATE.start_main_~main__u~0#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (= ~__return_151~0 |ULTIMATE.start_main_~main____CPAchecker_TMP_1~0#1|) (= |ULTIMATE.start_main_~f__x~2#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= ~__return_136~0 |ULTIMATE.start_main_~main__y~0#1|) (= ~__return_146~0 |ULTIMATE.start_main_~main__u~0#1|) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_0~0#1| 1) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (<= 100001 |ULTIMATE.start_main_~main__i~0#1|) (= |ULTIMATE.start_main_~g__x~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~g__x~3#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= ~__return_main~0 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|))' at error location [2023-12-02 14:01:15,408 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:01:15,408 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:01:15,408 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2023-12-02 14:01:15,409 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662850359] [2023-12-02 14:01:15,409 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:01:15,410 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2023-12-02 14:01:15,410 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:01:15,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2023-12-02 14:01:15,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18554, Invalid=20848, Unknown=0, NotChecked=0, Total=39402 [2023-12-02 14:01:15,424 INFO L87 Difference]: Start difference. First operand 385 states and 386 transitions. Second operand has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 192 states have internal predecessors, (766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:01:16,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:01:16,724 INFO L93 Difference]: Finished difference Result 776 states and 873 transitions. [2023-12-02 14:01:16,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2023-12-02 14:01:16,725 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 192 states have internal predecessors, (766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 383 [2023-12-02 14:01:16,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:01:16,729 INFO L225 Difference]: With dead ends: 776 [2023-12-02 14:01:16,729 INFO L226 Difference]: Without dead ends: 769 [2023-12-02 14:01:16,732 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1243 GetRequests, 1046 SyntacticMatches, 0 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2091 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=18554, Invalid=20848, Unknown=0, NotChecked=0, Total=39402 [2023-12-02 14:01:16,733 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 443 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:01:16,733 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 453 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:01:16,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 769 states. [2023-12-02 14:01:16,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 769 to 769. [2023-12-02 14:01:16,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 769 states, 768 states have (on average 1.0026041666666667) internal successors, (770), 768 states have internal predecessors, (770), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:01:16,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 769 states to 769 states and 770 transitions. [2023-12-02 14:01:16,746 INFO L78 Accepts]: Start accepts. Automaton has 769 states and 770 transitions. Word has length 383 [2023-12-02 14:01:16,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:01:16,747 INFO L495 AbstractCegarLoop]: Abstraction has 769 states and 770 transitions. [2023-12-02 14:01:16,747 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 3.9689119170984455) internal successors, (766), 192 states have internal predecessors, (766), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:01:16,747 INFO L276 IsEmpty]: Start isEmpty. Operand 769 states and 770 transitions. [2023-12-02 14:01:16,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 768 [2023-12-02 14:01:16,762 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:01:16,763 INFO L195 NwaCegarLoop]: trace histogram [190, 190, 190, 190, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:01:16,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 14:01:16,963 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:01:16,964 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:01:16,964 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:01:16,964 INFO L85 PathProgramCache]: Analyzing trace with hash 1148915919, now seen corresponding path program 7 times [2023-12-02 14:01:16,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:01:16,964 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758363466] [2023-12-02 14:01:16,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:01:16,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:01:17,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:01:42,319 INFO L134 CoverageAnalysis]: Checked inductivity of 72010 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:01:42,319 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:01:42,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758363466] [2023-12-02 14:01:42,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758363466] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:01:42,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828471068] [2023-12-02 14:01:42,320 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:01:42,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:01:42,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:01:42,321 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:01:42,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:01:43,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:01:43,293 INFO L262 TraceCheckSpWp]: Trace formula consists of 6148 conjuncts, 192 conjunts are in the unsatisfiable core [2023-12-02 14:01:43,310 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:01:44,017 INFO L134 CoverageAnalysis]: Checked inductivity of 72010 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:01:44,017 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:02:17,776 INFO L134 CoverageAnalysis]: Checked inductivity of 72010 backedges. 0 proven. 72010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:02:17,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828471068] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:02:17,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [131016150] [2023-12-02 14:02:17,778 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:02:17,778 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:02:17,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:02:17,779 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:02:17,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:02:18,085 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:02:19,634 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13156#(and (= |ULTIMATE.start_main_~f__x~0#1| 0.0) (<= 1 |#StackHeapBarrier|) (= ~__return_142~0 |ULTIMATE.start_main_~main__z~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| 0) (= |ULTIMATE.start_main_~__tmp_9~0#1| 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~f__x~3#1| |ULTIMATE.start_main_~__tmp_7~0#1|) (= |ULTIMATE.start_main_~g__x~2#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (= |ULTIMATE.start_main_~main__u~0#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (= ~__return_151~0 |ULTIMATE.start_main_~main____CPAchecker_TMP_1~0#1|) (= |ULTIMATE.start_main_~f__x~2#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= ~__return_136~0 |ULTIMATE.start_main_~main__y~0#1|) (= ~__return_146~0 |ULTIMATE.start_main_~main__u~0#1|) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_0~0#1| 1) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (<= 100001 |ULTIMATE.start_main_~main__i~0#1|) (= |ULTIMATE.start_main_~g__x~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~g__x~3#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= ~__return_main~0 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|))' at error location [2023-12-02 14:02:19,635 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:02:19,635 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:02:19,635 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [192, 192, 192] total 384 [2023-12-02 14:02:19,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399681512] [2023-12-02 14:02:19,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:02:19,637 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2023-12-02 14:02:19,637 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:02:19,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2023-12-02 14:02:19,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73946, Invalid=78544, Unknown=0, NotChecked=0, Total=152490 [2023-12-02 14:02:19,657 INFO L87 Difference]: Start difference. First operand 769 states and 770 transitions. Second operand has 385 states, 385 states have (on average 3.9844155844155846) internal successors, (1534), 384 states have internal predecessors, (1534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:02:25,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:02:25,718 INFO L93 Difference]: Finished difference Result 1544 states and 1737 transitions. [2023-12-02 14:02:25,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2023-12-02 14:02:25,720 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 3.9844155844155846) internal successors, (1534), 384 states have internal predecessors, (1534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 767 [2023-12-02 14:02:25,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:02:25,727 INFO L225 Difference]: With dead ends: 1544 [2023-12-02 14:02:25,727 INFO L226 Difference]: Without dead ends: 1537 [2023-12-02 14:02:25,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2491 GetRequests, 2102 SyntacticMatches, 0 SemanticMatches, 389 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4203 ImplicationChecksByTransitivity, 45.5s TimeCoverageRelationStatistics Valid=73946, Invalid=78544, Unknown=0, NotChecked=0, Total=152490 [2023-12-02 14:02:25,734 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 811 mSDsCounter, 0 mSdLazyCounter, 773 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 821 SdHoareTripleChecker+Invalid, 775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 773 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 14:02:25,734 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 821 Invalid, 775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 773 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 14:02:25,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1537 states. [2023-12-02 14:02:25,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1537 to 1537. [2023-12-02 14:02:25,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1537 states, 1536 states have (on average 1.0013020833333333) internal successors, (1538), 1536 states have internal predecessors, (1538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:02:25,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1537 states to 1537 states and 1538 transitions. [2023-12-02 14:02:25,756 INFO L78 Accepts]: Start accepts. Automaton has 1537 states and 1538 transitions. Word has length 767 [2023-12-02 14:02:25,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:02:25,757 INFO L495 AbstractCegarLoop]: Abstraction has 1537 states and 1538 transitions. [2023-12-02 14:02:25,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 3.9844155844155846) internal successors, (1534), 384 states have internal predecessors, (1534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:02:25,758 INFO L276 IsEmpty]: Start isEmpty. Operand 1537 states and 1538 transitions. [2023-12-02 14:02:25,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1536 [2023-12-02 14:02:25,769 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:02:25,770 INFO L195 NwaCegarLoop]: trace histogram [382, 382, 382, 382, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:02:25,782 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 14:02:25,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 14:02:25,971 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:02:25,971 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:02:25,971 INFO L85 PathProgramCache]: Analyzing trace with hash 491329039, now seen corresponding path program 8 times [2023-12-02 14:02:25,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:02:25,972 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332874386] [2023-12-02 14:02:25,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:02:25,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:02:26,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:04:40,483 INFO L134 CoverageAnalysis]: Checked inductivity of 291466 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:04:40,483 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:04:40,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332874386] [2023-12-02 14:04:40,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332874386] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:04:40,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211830251] [2023-12-02 14:04:40,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:04:40,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:04:40,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:04:40,485 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:04:40,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:04:49,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 383 check-sat command(s) [2023-12-02 14:04:49,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:04:49,934 INFO L262 TraceCheckSpWp]: Trace formula consists of 12292 conjuncts, 384 conjunts are in the unsatisfiable core [2023-12-02 14:04:49,979 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:04:51,454 INFO L134 CoverageAnalysis]: Checked inductivity of 291466 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:04:51,454 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:07:10,823 INFO L134 CoverageAnalysis]: Checked inductivity of 291466 backedges. 0 proven. 291466 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:07:10,823 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211830251] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:07:10,824 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [749907470] [2023-12-02 14:07:10,826 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:07:10,826 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:07:10,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:07:10,827 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:07:10,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:07:11,112 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:07:13,796 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26216#(and (= |ULTIMATE.start_main_~f__x~0#1| 0.0) (<= 1 |#StackHeapBarrier|) (= ~__return_142~0 |ULTIMATE.start_main_~main__z~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_2~0#1| 0) (= |ULTIMATE.start_main_~__tmp_9~0#1| 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~__tmp_3~0#1|) (= |ULTIMATE.start_main_~f__x~3#1| |ULTIMATE.start_main_~__tmp_7~0#1|) (= |ULTIMATE.start_main_~g__x~2#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (= |ULTIMATE.start_main_~main__u~0#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= |ULTIMATE.start_main_~g__x~1#1| (/ 1.0 4.0)) (= ~__return_151~0 |ULTIMATE.start_main_~main____CPAchecker_TMP_1~0#1|) (= |ULTIMATE.start_main_~f__x~2#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= ~__return_136~0 |ULTIMATE.start_main_~main__y~0#1|) (= ~__return_146~0 |ULTIMATE.start_main_~main__u~0#1|) (= (/ 1.0 4.0) |ULTIMATE.start_main_~__tmp_4~0#1|) (= |ULTIMATE.start_main_~main____CPAchecker_TMP_0~0#1| 1) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0.0) (<= 100001 |ULTIMATE.start_main_~main__i~0#1|) (= |ULTIMATE.start_main_~g__x~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_5~0#1|) (= |ULTIMATE.start_main_~__tmp_2~0#1| 0.0) (= |ULTIMATE.start_main_~main__x~0#1| |ULTIMATE.start_main_~__tmp_6~0#1|) (= |ULTIMATE.start_main_~g__x~3#1| |ULTIMATE.start_main_~__tmp_8~0#1|) (= ~__return_main~0 0) (= (/ 3.0 4.0) |ULTIMATE.start_main_~f__x~1#1|))' at error location [2023-12-02 14:07:13,796 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:07:13,796 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:07:13,798 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [384, 384, 384] total 768 [2023-12-02 14:07:13,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004622735] [2023-12-02 14:07:13,798 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:07:13,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 769 states [2023-12-02 14:07:13,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:07:13,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 769 interpolants. [2023-12-02 14:07:13,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295322, Invalid=304528, Unknown=0, NotChecked=0, Total=599850 [2023-12-02 14:07:13,884 INFO L87 Difference]: Start difference. First operand 1537 states and 1538 transitions. Second operand has 769 states, 769 states have (on average 3.9921976592977892) internal successors, (3070), 768 states have internal predecessors, (3070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:08:10,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:08:10,925 INFO L93 Difference]: Finished difference Result 3080 states and 3465 transitions. [2023-12-02 14:08:10,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. [2023-12-02 14:08:10,928 INFO L78 Accepts]: Start accepts. Automaton has has 769 states, 769 states have (on average 3.9921976592977892) internal successors, (3070), 768 states have internal predecessors, (3070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 1535 [2023-12-02 14:08:10,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:08:10,945 INFO L225 Difference]: With dead ends: 3080 [2023-12-02 14:08:10,945 INFO L226 Difference]: Without dead ends: 3073 [2023-12-02 14:08:10,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4987 GetRequests, 4214 SyntacticMatches, 0 SemanticMatches, 773 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8427 ImplicationChecksByTransitivity, 185.1s TimeCoverageRelationStatistics Valid=295322, Invalid=304528, Unknown=0, NotChecked=0, Total=599850 [2023-12-02 14:08:10,981 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 1609 mSDsCounter, 0 mSdLazyCounter, 1547 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 1619 SdHoareTripleChecker+Invalid, 1549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:08:10,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 1619 Invalid, 1549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1547 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-12-02 14:08:10,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3073 states. [2023-12-02 14:08:11,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3073 to 3073. [2023-12-02 14:08:11,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3073 states, 3072 states have (on average 1.0006510416666667) internal successors, (3074), 3072 states have internal predecessors, (3074), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:08:11,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3073 states to 3073 states and 3074 transitions. [2023-12-02 14:08:11,037 INFO L78 Accepts]: Start accepts. Automaton has 3073 states and 3074 transitions. Word has length 1535 [2023-12-02 14:08:11,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:08:11,039 INFO L495 AbstractCegarLoop]: Abstraction has 3073 states and 3074 transitions. [2023-12-02 14:08:11,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 769 states, 769 states have (on average 3.9921976592977892) internal successors, (3070), 768 states have internal predecessors, (3070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:08:11,042 INFO L276 IsEmpty]: Start isEmpty. Operand 3073 states and 3074 transitions. [2023-12-02 14:08:11,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3072 [2023-12-02 14:08:11,105 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:08:11,106 INFO L195 NwaCegarLoop]: trace histogram [766, 766, 766, 766, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:08:11,135 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 14:08:11,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_513304fc-3639-4ab1-846a-d49421ec660a/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:08:11,307 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:08:11,307 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:08:11,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1249714319, now seen corresponding path program 9 times [2023-12-02 14:08:11,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:08:11,308 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56169802] [2023-12-02 14:08:11,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:08:11,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:08:14,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat