./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/neural-networks/cartpole_68_safe.c-amalgamation.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/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_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/neural-networks/cartpole_68_safe.c-amalgamation.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/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_20055ae8-9059-44bb-9140-f6212a053e00/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 53f9a88fb540be34399c2767f40e3fe194ef707ae5e9c2bbbf5adf40dfa61012 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 19:03:43,972 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 19:03:44,036 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 19:03:44,041 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 19:03:44,042 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 19:03:44,066 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 19:03:44,067 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 19:03:44,067 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 19:03:44,068 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 19:03:44,068 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 19:03:44,069 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 19:03:44,069 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 19:03:44,070 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 19:03:44,070 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 19:03:44,071 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 19:03:44,071 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 19:03:44,072 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 19:03:44,072 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 19:03:44,073 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 19:03:44,073 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 19:03:44,074 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 19:03:44,075 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 19:03:44,076 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 19:03:44,076 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 19:03:44,077 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 19:03:44,077 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 19:03:44,078 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 19:03:44,078 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 19:03:44,079 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 19:03:44,079 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 19:03:44,079 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 19:03:44,080 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 19:03:44,080 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 19:03:44,080 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 19:03:44,081 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 19:03:44,081 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 19:03:44,081 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 19:03:44,081 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:03:44,082 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 19:03:44,082 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 19:03:44,082 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 19:03:44,082 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 19:03:44,083 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 19:03:44,083 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 19:03:44,083 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 19:03:44,083 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 19:03:44,083 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 19:03:44,084 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_20055ae8-9059-44bb-9140-f6212a053e00/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 53f9a88fb540be34399c2767f40e3fe194ef707ae5e9c2bbbf5adf40dfa61012 [2023-12-02 19:03:44,310 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 19:03:44,330 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 19:03:44,333 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 19:03:44,334 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 19:03:44,335 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 19:03:44,336 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/neural-networks/cartpole_68_safe.c-amalgamation.i [2023-12-02 19:03:47,115 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 19:03:47,461 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 19:03:47,461 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/sv-benchmarks/c/neural-networks/cartpole_68_safe.c-amalgamation.i [2023-12-02 19:03:47,488 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/data/bbbd86e86/e8aa817d5b2a4aefbfc042140427fd66/FLAGa4967d698 [2023-12-02 19:03:47,501 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/data/bbbd86e86/e8aa817d5b2a4aefbfc042140427fd66 [2023-12-02 19:03:47,503 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 19:03:47,504 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 19:03:47,506 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 19:03:47,506 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 19:03:47,510 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 19:03:47,511 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:03:47" (1/1) ... [2023-12-02 19:03:47,512 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@599b83cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:47, skipping insertion in model container [2023-12-02 19:03:47,512 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:03:47" (1/1) ... [2023-12-02 19:03:47,596 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 19:03:48,247 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_20055ae8-9059-44bb-9140-f6212a053e00/sv-benchmarks/c/neural-networks/cartpole_68_safe.c-amalgamation.i[63708,63721] [2023-12-02 19:03:48,438 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:03:48,564 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 19:03:48,607 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_20055ae8-9059-44bb-9140-f6212a053e00/sv-benchmarks/c/neural-networks/cartpole_68_safe.c-amalgamation.i[63708,63721] [2023-12-02 19:03:48,740 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:03:49,009 INFO L206 MainTranslator]: Completed translation [2023-12-02 19:03:49,009 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49 WrapperNode [2023-12-02 19:03:49,009 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 19:03:49,010 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 19:03:49,011 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 19:03:49,011 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 19:03:49,017 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,080 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,299 INFO L138 Inliner]: procedures = 620, calls = 4746, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 5015 [2023-12-02 19:03:49,300 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 19:03:49,301 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 19:03:49,301 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 19:03:49,301 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 19:03:49,310 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,310 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,342 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,342 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,446 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,457 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,477 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,488 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,517 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 19:03:49,518 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 19:03:49,518 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 19:03:49,518 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 19:03:49,519 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (1/1) ... [2023-12-02 19:03:49,538 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:03:49,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:03:49,561 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 19:03:49,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 19:03:49,592 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2023-12-02 19:03:49,593 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 19:03:49,593 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~real [2023-12-02 19:03:49,593 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2023-12-02 19:03:49,593 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 19:03:49,593 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 19:03:49,593 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 19:03:49,593 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 19:03:49,594 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 19:03:49,777 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 19:03:49,780 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 19:03:55,818 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 19:03:58,237 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 19:03:58,237 INFO L309 CfgBuilder]: Removed 12 assume(true) statements. [2023-12-02 19:03:58,238 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:03:58 BoogieIcfgContainer [2023-12-02 19:03:58,239 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 19:03:58,241 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 19:03:58,241 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 19:03:58,244 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 19:03:58,245 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 07:03:47" (1/3) ... [2023-12-02 19:03:58,245 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@288345e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:03:58, skipping insertion in model container [2023-12-02 19:03:58,246 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:03:49" (2/3) ... [2023-12-02 19:03:58,246 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@288345e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:03:58, skipping insertion in model container [2023-12-02 19:03:58,246 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:03:58" (3/3) ... [2023-12-02 19:03:58,247 INFO L112 eAbstractionObserver]: Analyzing ICFG cartpole_68_safe.c-amalgamation.i [2023-12-02 19:03:58,266 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 19:03:58,267 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 19:03:58,305 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 19:03:58,311 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;@b8c1677, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 19:03:58,311 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 19:03:58,315 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.875) internal successors, (30), 17 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:03:58,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 19:03:58,320 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:03:58,320 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:03:58,320 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:03:58,324 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:03:58,324 INFO L85 PathProgramCache]: Analyzing trace with hash -873503770, now seen corresponding path program 1 times [2023-12-02 19:03:58,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:03:58,334 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5217948] [2023-12-02 19:03:58,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:03:58,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:03:58,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:00,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:04:00,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:00,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5217948] [2023-12-02 19:04:00,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [5217948] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:04:00,071 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:04:00,071 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 19:04:00,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76722268] [2023-12-02 19:04:00,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:00,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:04:00,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:00,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:04:00,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:04:00,113 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.875) internal successors, (30), 17 states have internal predecessors, (30), 0 states have call successors, (0), 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 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:00,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:00,495 INFO L93 Difference]: Finished difference Result 35 states and 59 transitions. [2023-12-02 19:04:00,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:04:00,498 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 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 9 [2023-12-02 19:04:00,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:00,506 INFO L225 Difference]: With dead ends: 35 [2023-12-02 19:04:00,506 INFO L226 Difference]: Without dead ends: 17 [2023-12-02 19:04:00,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:04:00,513 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:00,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 19:04:00,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-12-02 19:04:00,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-12-02 19:04:00,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:00,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 28 transitions. [2023-12-02 19:04:00,551 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 28 transitions. Word has length 9 [2023-12-02 19:04:00,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:00,551 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 28 transitions. [2023-12-02 19:04:00,551 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:00,552 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 28 transitions. [2023-12-02 19:04:00,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 19:04:00,553 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:00,553 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:00,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 19:04:00,553 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:00,554 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:00,554 INFO L85 PathProgramCache]: Analyzing trace with hash 1574488396, now seen corresponding path program 1 times [2023-12-02 19:04:00,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:00,555 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661615353] [2023-12-02 19:04:00,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:00,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:00,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:01,965 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 19:04:01,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:01,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661615353] [2023-12-02 19:04:01,966 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661615353] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:01,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822650457] [2023-12-02 19:04:01,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:01,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:01,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:01,970 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:01,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 19:04:03,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:03,349 INFO L262 TraceCheckSpWp]: Trace formula consists of 5392 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 19:04:03,360 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:03,383 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 19:04:03,384 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:03,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:04:03,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822650457] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:03,396 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:04:03,396 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 4] total 6 [2023-12-02 19:04:03,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545970480] [2023-12-02 19:04:03,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:03,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:04:03,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:03,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:04:03,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:04:03,399 INFO L87 Difference]: Start difference. First operand 17 states and 28 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:03,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:03,751 INFO L93 Difference]: Finished difference Result 28 states and 46 transitions. [2023-12-02 19:04:03,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:04:03,752 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 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 10 [2023-12-02 19:04:03,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:03,752 INFO L225 Difference]: With dead ends: 28 [2023-12-02 19:04:03,753 INFO L226 Difference]: Without dead ends: 18 [2023-12-02 19:04:03,753 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:04:03,754 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:03,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:04:03,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-12-02 19:04:03,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-12-02 19:04:03,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:03,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 29 transitions. [2023-12-02 19:04:03,758 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 29 transitions. Word has length 10 [2023-12-02 19:04:03,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:03,759 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 29 transitions. [2023-12-02 19:04:03,759 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:03,759 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 29 transitions. [2023-12-02 19:04:03,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 19:04:03,760 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:03,760 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:03,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 19:04:03,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 19:04:03,967 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:03,967 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:03,967 INFO L85 PathProgramCache]: Analyzing trace with hash -1684807753, now seen corresponding path program 1 times [2023-12-02 19:04:03,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:03,968 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507176510] [2023-12-02 19:04:03,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:03,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:04,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:04,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:04:04,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:04,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507176510] [2023-12-02 19:04:04,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507176510] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:04,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842370019] [2023-12-02 19:04:04,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:04,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:04,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:04,939 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:04,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 19:04:06,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:06,133 INFO L262 TraceCheckSpWp]: Trace formula consists of 5404 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 19:04:06,137 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:06,147 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:04:06,148 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:06,157 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 19:04:06,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842370019] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:06,158 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:04:06,158 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 4] total 6 [2023-12-02 19:04:06,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626658035] [2023-12-02 19:04:06,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:06,159 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:04:06,159 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:06,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:04:06,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:04:06,160 INFO L87 Difference]: Start difference. First operand 18 states and 29 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 19:04:06,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:06,438 INFO L93 Difference]: Finished difference Result 25 states and 39 transitions. [2023-12-02 19:04:06,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:04:06,439 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 19:04:06,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:06,439 INFO L225 Difference]: With dead ends: 25 [2023-12-02 19:04:06,439 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 19:04:06,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:04:06,441 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:06,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:04:06,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 19:04:06,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-12-02 19:04:06,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:06,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 30 transitions. [2023-12-02 19:04:06,446 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 30 transitions. Word has length 11 [2023-12-02 19:04:06,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:06,446 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 30 transitions. [2023-12-02 19:04:06,446 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 19:04:06,446 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 30 transitions. [2023-12-02 19:04:06,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-12-02 19:04:06,447 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:06,447 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:06,460 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 19:04:06,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:06,648 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:06,648 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:06,648 INFO L85 PathProgramCache]: Analyzing trace with hash -699168459, now seen corresponding path program 1 times [2023-12-02 19:04:06,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:06,648 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408586586] [2023-12-02 19:04:06,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:06,649 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:06,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:07,759 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 19:04:07,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:07,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408586586] [2023-12-02 19:04:07,760 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1408586586] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:07,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955036367] [2023-12-02 19:04:07,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:07,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:07,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:07,763 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:07,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 19:04:08,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:08,977 INFO L262 TraceCheckSpWp]: Trace formula consists of 5416 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 19:04:08,982 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:08,994 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 19:04:08,994 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:09,007 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 19:04:09,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955036367] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:09,007 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:04:09,008 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 6 [2023-12-02 19:04:09,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225531024] [2023-12-02 19:04:09,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:09,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:04:09,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:09,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:04:09,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:04:09,009 INFO L87 Difference]: Start difference. First operand 19 states and 30 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:09,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:09,270 INFO L93 Difference]: Finished difference Result 33 states and 52 transitions. [2023-12-02 19:04:09,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:04:09,270 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-12-02 19:04:09,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:09,271 INFO L225 Difference]: With dead ends: 33 [2023-12-02 19:04:09,271 INFO L226 Difference]: Without dead ends: 20 [2023-12-02 19:04:09,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:04:09,272 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:09,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:04:09,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-12-02 19:04:09,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-12-02 19:04:09,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:09,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 31 transitions. [2023-12-02 19:04:09,277 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 31 transitions. Word has length 12 [2023-12-02 19:04:09,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:09,277 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 31 transitions. [2023-12-02 19:04:09,277 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:09,277 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 31 transitions. [2023-12-02 19:04:09,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 19:04:09,278 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:09,278 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:09,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 19:04:09,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:09,479 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:09,479 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:09,479 INFO L85 PathProgramCache]: Analyzing trace with hash -859565474, now seen corresponding path program 1 times [2023-12-02 19:04:09,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:09,479 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416442290] [2023-12-02 19:04:09,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:09,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:09,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:10,488 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 19:04:10,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:10,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416442290] [2023-12-02 19:04:10,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416442290] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:10,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871936003] [2023-12-02 19:04:10,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:10,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:10,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:10,491 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:10,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 19:04:11,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:11,865 INFO L262 TraceCheckSpWp]: Trace formula consists of 5422 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 19:04:11,870 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:11,895 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 19:04:11,895 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:11,911 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:04:11,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871936003] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:11,911 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:04:11,911 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 4] total 7 [2023-12-02 19:04:11,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965453944] [2023-12-02 19:04:11,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:11,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:04:11,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:11,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:04:11,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:04:11,914 INFO L87 Difference]: Start difference. First operand 20 states and 31 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:12,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:12,332 INFO L93 Difference]: Finished difference Result 29 states and 44 transitions. [2023-12-02 19:04:12,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:04:12,333 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-12-02 19:04:12,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:12,334 INFO L225 Difference]: With dead ends: 29 [2023-12-02 19:04:12,334 INFO L226 Difference]: Without dead ends: 21 [2023-12-02 19:04:12,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:04:12,335 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:12,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 19:04:12,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-12-02 19:04:12,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-12-02 19:04:12,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:12,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 32 transitions. [2023-12-02 19:04:12,341 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 32 transitions. Word has length 14 [2023-12-02 19:04:12,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:12,342 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 32 transitions. [2023-12-02 19:04:12,342 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:12,342 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 32 transitions. [2023-12-02 19:04:12,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-12-02 19:04:12,343 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:12,343 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:12,362 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 19:04:12,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:12,543 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:12,544 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:12,544 INFO L85 PathProgramCache]: Analyzing trace with hash 951673113, now seen corresponding path program 1 times [2023-12-02 19:04:12,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:12,544 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663514564] [2023-12-02 19:04:12,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:12,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:12,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:13,475 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:04:13,475 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:13,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663514564] [2023-12-02 19:04:13,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663514564] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:13,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189487879] [2023-12-02 19:04:13,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:13,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:13,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:13,477 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:13,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 19:04:14,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:14,643 INFO L262 TraceCheckSpWp]: Trace formula consists of 5428 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 19:04:14,648 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:14,675 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:04:14,675 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:14,690 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 19:04:14,690 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189487879] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:14,691 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:04:14,691 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 4] total 7 [2023-12-02 19:04:14,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920352176] [2023-12-02 19:04:14,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:14,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:04:14,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:14,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:04:14,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:04:14,693 INFO L87 Difference]: Start difference. First operand 21 states and 32 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:14,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:14,987 INFO L93 Difference]: Finished difference Result 25 states and 36 transitions. [2023-12-02 19:04:14,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:04:14,988 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 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 16 [2023-12-02 19:04:14,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:14,988 INFO L225 Difference]: With dead ends: 25 [2023-12-02 19:04:14,988 INFO L226 Difference]: Without dead ends: 22 [2023-12-02 19:04:14,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:04:14,990 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:14,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:04:14,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-12-02 19:04:14,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-12-02 19:04:14,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:14,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 33 transitions. [2023-12-02 19:04:14,995 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 33 transitions. Word has length 16 [2023-12-02 19:04:14,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:14,996 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 33 transitions. [2023-12-02 19:04:14,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:14,996 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 33 transitions. [2023-12-02 19:04:14,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 19:04:14,997 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:14,997 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:15,013 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 19:04:15,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 19:04:15,197 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:15,198 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:15,198 INFO L85 PathProgramCache]: Analyzing trace with hash -369542329, now seen corresponding path program 1 times [2023-12-02 19:04:15,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:15,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48864200] [2023-12-02 19:04:15,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:15,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:15,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:15,923 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 19:04:15,923 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:15,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48864200] [2023-12-02 19:04:15,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48864200] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:15,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317363896] [2023-12-02 19:04:15,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:15,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:15,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:15,925 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:15,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 19:04:17,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:17,101 INFO L262 TraceCheckSpWp]: Trace formula consists of 5434 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 19:04:17,106 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:17,127 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:04:17,127 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:17,148 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 19:04:17,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317363896] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:17,148 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:04:17,149 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 5] total 8 [2023-12-02 19:04:17,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780019578] [2023-12-02 19:04:17,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:17,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:04:17,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:17,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:04:17,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-12-02 19:04:17,150 INFO L87 Difference]: Start difference. First operand 22 states and 33 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 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 19:04:17,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:17,425 INFO L93 Difference]: Finished difference Result 41 states and 63 transitions. [2023-12-02 19:04:17,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:04:17,426 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-12-02 19:04:17,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:17,426 INFO L225 Difference]: With dead ends: 41 [2023-12-02 19:04:17,426 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 19:04:17,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-12-02 19:04:17,428 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:17,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:04:17,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 19:04:17,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-12-02 19:04:17,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 22 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:17,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 34 transitions. [2023-12-02 19:04:17,433 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 34 transitions. Word has length 18 [2023-12-02 19:04:17,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:17,433 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 34 transitions. [2023-12-02 19:04:17,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 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 19:04:17,434 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 34 transitions. [2023-12-02 19:04:17,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 19:04:17,434 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:17,434 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:17,448 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 19:04:17,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:17,635 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:17,635 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:17,635 INFO L85 PathProgramCache]: Analyzing trace with hash 746853288, now seen corresponding path program 1 times [2023-12-02 19:04:17,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:17,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288569189] [2023-12-02 19:04:17,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:17,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:17,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:18,320 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 19:04:18,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:18,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288569189] [2023-12-02 19:04:18,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288569189] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:18,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064091529] [2023-12-02 19:04:18,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:18,321 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:18,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:18,322 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:18,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 19:04:19,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:19,414 INFO L262 TraceCheckSpWp]: Trace formula consists of 5448 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 19:04:19,421 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:19,457 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:04:19,457 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:19,478 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 19:04:19,478 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064091529] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:19,478 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:04:19,478 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 6] total 10 [2023-12-02 19:04:19,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369435379] [2023-12-02 19:04:19,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:19,478 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:04:19,478 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:19,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:04:19,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 19:04:19,479 INFO L87 Difference]: Start difference. First operand 23 states and 34 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:19,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:19,736 INFO L93 Difference]: Finished difference Result 36 states and 54 transitions. [2023-12-02 19:04:19,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:04:19,736 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-12-02 19:04:19,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:19,737 INFO L225 Difference]: With dead ends: 36 [2023-12-02 19:04:19,737 INFO L226 Difference]: Without dead ends: 24 [2023-12-02 19:04:19,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 19:04:19,738 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:19,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:04:19,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-12-02 19:04:19,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-12-02 19:04:19,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:19,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 35 transitions. [2023-12-02 19:04:19,742 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 35 transitions. Word has length 20 [2023-12-02 19:04:19,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:19,742 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 35 transitions. [2023-12-02 19:04:19,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:19,742 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 35 transitions. [2023-12-02 19:04:19,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-12-02 19:04:19,743 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:19,743 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:19,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 19:04:19,943 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 19:04:19,944 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:19,944 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:19,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1325324211, now seen corresponding path program 1 times [2023-12-02 19:04:19,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:19,944 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940020490] [2023-12-02 19:04:19,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:19,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:20,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:20,665 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 19:04:20,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:20,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940020490] [2023-12-02 19:04:20,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940020490] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:20,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834244403] [2023-12-02 19:04:20,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:20,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:20,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:20,667 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:20,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 19:04:21,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:21,771 INFO L262 TraceCheckSpWp]: Trace formula consists of 5462 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 19:04:21,777 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:21,810 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:04:21,810 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:21,831 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 19:04:21,831 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834244403] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:21,832 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 19:04:21,832 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 6] total 10 [2023-12-02 19:04:21,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628796940] [2023-12-02 19:04:21,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:04:21,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:04:21,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:04:21,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:04:21,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 19:04:21,833 INFO L87 Difference]: Start difference. First operand 24 states and 35 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 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 19:04:22,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:04:22,093 INFO L93 Difference]: Finished difference Result 38 states and 56 transitions. [2023-12-02 19:04:22,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:04:22,094 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 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 22 [2023-12-02 19:04:22,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:04:22,095 INFO L225 Difference]: With dead ends: 38 [2023-12-02 19:04:22,095 INFO L226 Difference]: Without dead ends: 25 [2023-12-02 19:04:22,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-12-02 19:04:22,096 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 19:04:22,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 19:04:22,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-12-02 19:04:22,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-12-02 19:04:22,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.5) internal successors, (36), 24 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:04:22,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 36 transitions. [2023-12-02 19:04:22,102 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 36 transitions. Word has length 22 [2023-12-02 19:04:22,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:04:22,102 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 36 transitions. [2023-12-02 19:04:22,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 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 19:04:22,102 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 36 transitions. [2023-12-02 19:04:22,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 19:04:22,103 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:04:22,103 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:04:22,116 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 19:04:22,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 19:04:22,304 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:04:22,304 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:04:22,304 INFO L85 PathProgramCache]: Analyzing trace with hash -530891598, now seen corresponding path program 1 times [2023-12-02 19:04:22,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:04:22,304 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104333998] [2023-12-02 19:04:22,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:22,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:04:22,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:23,009 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 19:04:23,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:04:23,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104333998] [2023-12-02 19:04:23,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104333998] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:04:23,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136447862] [2023-12-02 19:04:23,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:04:23,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:04:23,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:04:23,011 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:04:23,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20055ae8-9059-44bb-9140-f6212a053e00/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 19:04:24,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:04:24,194 INFO L262 TraceCheckSpWp]: Trace formula consists of 5467 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 19:04:24,198 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:04:24,212 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 19:04:24,212 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:04:24,230 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 19:04:24,230 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [136447862] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:04:24,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [863423123] [2023-12-02 19:04:24,250 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 19:04:24,250 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:04:24,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:04:24,258 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:04:24,258 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:06:51,505 WARN L293 SmtUtils]: Spent 30.01s on a formula simplification that was a NOOP. DAG size: 9608 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2023-12-02 19:13:11,268 WARN L293 SmtUtils]: Spent 56.21s on a formula simplification that was a NOOP. DAG size: 9846 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-12-02 19:14:08,276 WARN L293 SmtUtils]: Spent 56.99s on a formula simplification that was a NOOP. DAG size: 9846 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-12-02 19:15:34,450 WARN L293 SmtUtils]: Spent 1.44m on a formula simplification. DAG size of input: 9857 DAG size of output: 9853 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm)