./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.03.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/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_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.03.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/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_f28b5fcb-868c-435b-a10e-23caa456d089/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 4996a252ab084c920e1b9a19c3119ce328d4cb97d6d45029062c9dac50449e19 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:59:21,883 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:59:21,945 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 16:59:21,951 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:59:21,951 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:59:21,975 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:59:21,976 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:59:21,976 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:59:21,977 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:59:21,977 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:59:21,978 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:59:21,979 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:59:21,979 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:59:21,980 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:59:21,980 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:59:21,981 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:59:21,981 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:59:21,982 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:59:21,982 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:59:21,983 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:59:21,983 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:59:21,984 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:59:21,985 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:59:21,985 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:59:21,986 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 16:59:21,986 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:59:21,987 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 16:59:21,987 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:59:21,987 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:59:21,988 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:59:21,988 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:59:21,988 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 16:59:21,989 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:59:21,989 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:59:21,989 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:59:21,989 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:59:21,990 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:59:21,990 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:59:21,990 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:59:21,990 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:59:21,990 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:59:21,991 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:59:21,991 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:59:21,991 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:59:21,991 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:59:21,991 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:59:21,992 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:59:21,992 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_f28b5fcb-868c-435b-a10e-23caa456d089/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4996a252ab084c920e1b9a19c3119ce328d4cb97d6d45029062c9dac50449e19 [2023-12-02 16:59:22,216 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:59:22,238 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:59:22,240 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:59:22,242 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:59:22,242 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:59:22,243 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/systemc/token_ring.03.cil-2.c [2023-12-02 16:59:25,003 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:59:25,173 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:59:25,174 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/sv-benchmarks/c/systemc/token_ring.03.cil-2.c [2023-12-02 16:59:25,186 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/data/dda7a1e2a/4a582354f114420d9b9a9327a0d0ef51/FLAGce1112038 [2023-12-02 16:59:25,200 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/data/dda7a1e2a/4a582354f114420d9b9a9327a0d0ef51 [2023-12-02 16:59:25,202 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:59:25,204 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:59:25,205 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:59:25,205 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:59:25,210 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:59:25,211 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,212 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d73812 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25, skipping insertion in model container [2023-12-02 16:59:25,212 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,254 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:59:25,396 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_f28b5fcb-868c-435b-a10e-23caa456d089/sv-benchmarks/c/systemc/token_ring.03.cil-2.c[671,684] [2023-12-02 16:59:25,456 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:59:25,468 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:59:25,481 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_f28b5fcb-868c-435b-a10e-23caa456d089/sv-benchmarks/c/systemc/token_ring.03.cil-2.c[671,684] [2023-12-02 16:59:25,513 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:59:25,531 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:59:25,531 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25 WrapperNode [2023-12-02 16:59:25,531 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:59:25,532 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:59:25,533 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:59:25,533 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:59:25,540 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,549 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,579 INFO L138 Inliner]: procedures = 34, calls = 40, calls flagged for inlining = 18, calls inlined = 18, statements flattened = 339 [2023-12-02 16:59:25,579 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:59:25,580 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:59:25,580 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:59:25,580 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:59:25,589 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,589 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,593 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,593 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,600 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,607 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,610 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,612 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,616 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:59:25,617 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:59:25,617 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:59:25,617 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:59:25,618 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (1/1) ... [2023-12-02 16:59:25,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:59:25,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:25,647 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:59:25,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:59:25,680 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:59:25,680 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 16:59:25,680 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 16:59:25,681 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 16:59:25,681 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 16:59:25,681 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 16:59:25,681 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 16:59:25,681 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 16:59:25,681 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 16:59:25,682 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 16:59:25,682 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 16:59:25,682 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 16:59:25,682 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 16:59:25,682 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 16:59:25,682 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:59:25,682 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:59:25,764 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:59:25,766 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:59:26,111 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:59:26,294 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:59:26,294 INFO L309 CfgBuilder]: Removed 6 assume(true) statements. [2023-12-02 16:59:26,296 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:59:26 BoogieIcfgContainer [2023-12-02 16:59:26,296 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:59:26,299 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:59:26,299 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:59:26,302 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:59:26,302 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:59:25" (1/3) ... [2023-12-02 16:59:26,303 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ed05a20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:59:26, skipping insertion in model container [2023-12-02 16:59:26,303 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:59:25" (2/3) ... [2023-12-02 16:59:26,303 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ed05a20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:59:26, skipping insertion in model container [2023-12-02 16:59:26,304 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:59:26" (3/3) ... [2023-12-02 16:59:26,305 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.03.cil-2.c [2023-12-02 16:59:26,323 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:59:26,323 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 16:59:26,369 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:59:26,374 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;@68ace030, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:59:26,374 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 16:59:26,378 INFO L276 IsEmpty]: Start isEmpty. Operand has 93 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 70 states have internal predecessors, (100), 17 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2023-12-02 16:59:26,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 16:59:26,385 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:26,385 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:26,386 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:26,389 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:26,390 INFO L85 PathProgramCache]: Analyzing trace with hash -1912709648, now seen corresponding path program 1 times [2023-12-02 16:59:26,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:26,396 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433447153] [2023-12-02 16:59:26,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:26,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:26,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:26,713 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 16:59:26,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:26,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433447153] [2023-12-02 16:59:26,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [433447153] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:26,715 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:59:26,715 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 16:59:26,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522287422] [2023-12-02 16:59:26,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:26,722 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:59:26,722 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:26,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:59:26,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:59:26,753 INFO L87 Difference]: Start difference. First operand has 93 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 70 states have internal predecessors, (100), 17 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:59:27,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:27,022 INFO L93 Difference]: Finished difference Result 262 states and 390 transitions. [2023-12-02 16:59:27,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 16:59:27,024 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 39 [2023-12-02 16:59:27,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:27,032 INFO L225 Difference]: With dead ends: 262 [2023-12-02 16:59:27,033 INFO L226 Difference]: Without dead ends: 170 [2023-12-02 16:59:27,037 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:59:27,040 INFO L413 NwaCegarLoop]: 192 mSDtfsCounter, 219 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:27,041 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 322 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:59:27,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2023-12-02 16:59:27,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2023-12-02 16:59:27,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 126 states have (on average 1.3650793650793651) internal successors, (172), 128 states have internal predecessors, (172), 30 states have call successors, (30), 12 states have call predecessors, (30), 12 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2023-12-02 16:59:27,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 232 transitions. [2023-12-02 16:59:27,092 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 232 transitions. Word has length 39 [2023-12-02 16:59:27,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:27,093 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 232 transitions. [2023-12-02 16:59:27,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:59:27,093 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 232 transitions. [2023-12-02 16:59:27,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-12-02 16:59:27,098 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:27,098 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:27,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 16:59:27,099 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:27,100 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:27,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1841411943, now seen corresponding path program 1 times [2023-12-02 16:59:27,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:27,101 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761548432] [2023-12-02 16:59:27,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:27,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:27,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:27,253 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:59:27,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:27,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761548432] [2023-12-02 16:59:27,253 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761548432] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:27,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720327417] [2023-12-02 16:59:27,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:27,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:27,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:27,258 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:27,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:59:27,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:27,388 INFO L262 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:59:27,395 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:27,460 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 16:59:27,460 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:27,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720327417] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:27,461 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:27,461 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:59:27,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102115457] [2023-12-02 16:59:27,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:27,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:27,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:27,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:27,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:27,465 INFO L87 Difference]: Start difference. First operand 169 states and 232 transitions. Second operand has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 2 states have internal predecessors, (46), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:59:27,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:27,560 INFO L93 Difference]: Finished difference Result 490 states and 681 transitions. [2023-12-02 16:59:27,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:27,560 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 2 states have internal predecessors, (46), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 73 [2023-12-02 16:59:27,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:27,566 INFO L225 Difference]: With dead ends: 490 [2023-12-02 16:59:27,566 INFO L226 Difference]: Without dead ends: 326 [2023-12-02 16:59:27,568 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:27,569 INFO L413 NwaCegarLoop]: 138 mSDtfsCounter, 103 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:27,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 232 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:59:27,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2023-12-02 16:59:27,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 322. [2023-12-02 16:59:27,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 243 states have (on average 1.353909465020576) internal successors, (329), 246 states have internal predecessors, (329), 54 states have call successors, (54), 24 states have call predecessors, (54), 24 states have return successors, (54), 52 states have call predecessors, (54), 54 states have call successors, (54) [2023-12-02 16:59:27,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 437 transitions. [2023-12-02 16:59:27,606 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 437 transitions. Word has length 73 [2023-12-02 16:59:27,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:27,607 INFO L495 AbstractCegarLoop]: Abstraction has 322 states and 437 transitions. [2023-12-02 16:59:27,607 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 2 states have internal predecessors, (46), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:59:27,607 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 437 transitions. [2023-12-02 16:59:27,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-12-02 16:59:27,611 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:27,611 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:27,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:59:27,814 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:27,814 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:27,815 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:27,815 INFO L85 PathProgramCache]: Analyzing trace with hash 1021305051, now seen corresponding path program 1 times [2023-12-02 16:59:27,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:27,815 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597276716] [2023-12-02 16:59:27,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:27,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:27,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:27,944 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 16:59:27,944 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:27,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597276716] [2023-12-02 16:59:27,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597276716] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:27,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425148414] [2023-12-02 16:59:27,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:27,946 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:27,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:27,947 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:27,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:59:28,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:28,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:59:28,087 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:28,136 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:59:28,136 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:28,136 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425148414] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:28,137 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:28,137 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 16:59:28,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858752209] [2023-12-02 16:59:28,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:28,138 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:28,138 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:28,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:28,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:28,139 INFO L87 Difference]: Start difference. First operand 322 states and 437 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:59:28,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:28,249 INFO L93 Difference]: Finished difference Result 943 states and 1296 transitions. [2023-12-02 16:59:28,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:28,250 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 73 [2023-12-02 16:59:28,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:28,255 INFO L225 Difference]: With dead ends: 943 [2023-12-02 16:59:28,255 INFO L226 Difference]: Without dead ends: 626 [2023-12-02 16:59:28,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:28,258 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 100 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:28,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 230 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:59:28,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 626 states. [2023-12-02 16:59:28,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 626 to 620. [2023-12-02 16:59:28,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 620 states, 471 states have (on average 1.3397027600849256) internal successors, (631), 476 states have internal predecessors, (631), 100 states have call successors, (100), 48 states have call predecessors, (100), 48 states have return successors, (100), 96 states have call predecessors, (100), 100 states have call successors, (100) [2023-12-02 16:59:28,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 620 states to 620 states and 831 transitions. [2023-12-02 16:59:28,309 INFO L78 Accepts]: Start accepts. Automaton has 620 states and 831 transitions. Word has length 73 [2023-12-02 16:59:28,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:28,310 INFO L495 AbstractCegarLoop]: Abstraction has 620 states and 831 transitions. [2023-12-02 16:59:28,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 16:59:28,310 INFO L276 IsEmpty]: Start isEmpty. Operand 620 states and 831 transitions. [2023-12-02 16:59:28,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-12-02 16:59:28,313 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:28,314 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:28,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-12-02 16:59:28,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:28,515 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:28,515 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:28,515 INFO L85 PathProgramCache]: Analyzing trace with hash -466288679, now seen corresponding path program 1 times [2023-12-02 16:59:28,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:28,516 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49830792] [2023-12-02 16:59:28,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:28,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:28,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:28,790 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 16:59:28,791 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:28,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49830792] [2023-12-02 16:59:28,791 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49830792] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:28,791 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:59:28,792 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 16:59:28,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320917096] [2023-12-02 16:59:28,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:28,793 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:59:28,793 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:28,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:59:28,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:28,794 INFO L87 Difference]: Start difference. First operand 620 states and 831 transitions. Second operand has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 16:59:29,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:29,152 INFO L93 Difference]: Finished difference Result 1896 states and 2537 transitions. [2023-12-02 16:59:29,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:59:29,152 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 73 [2023-12-02 16:59:29,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:29,162 INFO L225 Difference]: With dead ends: 1896 [2023-12-02 16:59:29,162 INFO L226 Difference]: Without dead ends: 1282 [2023-12-02 16:59:29,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:59:29,165 INFO L413 NwaCegarLoop]: 121 mSDtfsCounter, 287 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 354 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:29,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 354 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:59:29,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1282 states. [2023-12-02 16:59:29,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1282 to 1184. [2023-12-02 16:59:29,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1184 states, 899 states have (on average 1.3203559510567298) internal successors, (1187), 908 states have internal predecessors, (1187), 188 states have call successors, (188), 96 states have call predecessors, (188), 96 states have return successors, (188), 180 states have call predecessors, (188), 188 states have call successors, (188) [2023-12-02 16:59:29,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1184 states to 1184 states and 1563 transitions. [2023-12-02 16:59:29,247 INFO L78 Accepts]: Start accepts. Automaton has 1184 states and 1563 transitions. Word has length 73 [2023-12-02 16:59:29,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:29,248 INFO L495 AbstractCegarLoop]: Abstraction has 1184 states and 1563 transitions. [2023-12-02 16:59:29,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 16:59:29,248 INFO L276 IsEmpty]: Start isEmpty. Operand 1184 states and 1563 transitions. [2023-12-02 16:59:29,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-12-02 16:59:29,252 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:29,252 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:29,252 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 16:59:29,252 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:29,253 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:29,253 INFO L85 PathProgramCache]: Analyzing trace with hash 480084396, now seen corresponding path program 1 times [2023-12-02 16:59:29,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:29,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555855923] [2023-12-02 16:59:29,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:29,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:29,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:29,453 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 16:59:29,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:29,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555855923] [2023-12-02 16:59:29,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555855923] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:29,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498940216] [2023-12-02 16:59:29,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:29,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:29,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:29,455 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:29,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:59:29,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:29,576 INFO L262 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:59:29,580 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:29,609 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 16:59:29,610 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:29,610 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498940216] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:29,610 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:29,610 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:59:29,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729368779] [2023-12-02 16:59:29,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:29,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:29,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:29,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:29,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:59:29,613 INFO L87 Difference]: Start difference. First operand 1184 states and 1563 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:59:29,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:29,762 INFO L93 Difference]: Finished difference Result 2109 states and 2806 transitions. [2023-12-02 16:59:29,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:29,762 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 87 [2023-12-02 16:59:29,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:29,773 INFO L225 Difference]: With dead ends: 2109 [2023-12-02 16:59:29,773 INFO L226 Difference]: Without dead ends: 1499 [2023-12-02 16:59:29,776 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:59:29,777 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 47 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:29,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 262 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:59:29,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1499 states. [2023-12-02 16:59:29,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1499 to 1368. [2023-12-02 16:59:29,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1368 states, 1067 states have (on average 1.344892221180881) internal successors, (1435), 1076 states have internal predecessors, (1435), 196 states have call successors, (196), 104 states have call predecessors, (196), 104 states have return successors, (196), 188 states have call predecessors, (196), 196 states have call successors, (196) [2023-12-02 16:59:29,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1368 states to 1368 states and 1827 transitions. [2023-12-02 16:59:29,890 INFO L78 Accepts]: Start accepts. Automaton has 1368 states and 1827 transitions. Word has length 87 [2023-12-02 16:59:29,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:29,890 INFO L495 AbstractCegarLoop]: Abstraction has 1368 states and 1827 transitions. [2023-12-02 16:59:29,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 16:59:29,890 INFO L276 IsEmpty]: Start isEmpty. Operand 1368 states and 1827 transitions. [2023-12-02 16:59:29,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2023-12-02 16:59:29,896 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:29,896 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:29,902 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 16:59:30,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:30,097 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:30,097 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:30,097 INFO L85 PathProgramCache]: Analyzing trace with hash -1087130442, now seen corresponding path program 1 times [2023-12-02 16:59:30,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:30,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743875470] [2023-12-02 16:59:30,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:30,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:30,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:30,179 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 16:59:30,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:30,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743875470] [2023-12-02 16:59:30,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1743875470] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:30,180 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:59:30,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 16:59:30,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263784913] [2023-12-02 16:59:30,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:30,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:30,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:30,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:30,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:59:30,182 INFO L87 Difference]: Start difference. First operand 1368 states and 1827 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:59:30,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:30,370 INFO L93 Difference]: Finished difference Result 3409 states and 4580 transitions. [2023-12-02 16:59:30,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:30,370 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 97 [2023-12-02 16:59:30,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:30,385 INFO L225 Difference]: With dead ends: 3409 [2023-12-02 16:59:30,385 INFO L226 Difference]: Without dead ends: 2046 [2023-12-02 16:59:30,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:59:30,390 INFO L413 NwaCegarLoop]: 138 mSDtfsCounter, 95 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:30,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 232 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:59:30,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2046 states. [2023-12-02 16:59:30,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2046 to 2032. [2023-12-02 16:59:30,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2032 states, 1587 states have (on average 1.3301827347195967) internal successors, (2111), 1600 states have internal predecessors, (2111), 288 states have call successors, (288), 156 states have call predecessors, (288), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-12-02 16:59:30,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2032 states to 2032 states and 2687 transitions. [2023-12-02 16:59:30,526 INFO L78 Accepts]: Start accepts. Automaton has 2032 states and 2687 transitions. Word has length 97 [2023-12-02 16:59:30,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:30,527 INFO L495 AbstractCegarLoop]: Abstraction has 2032 states and 2687 transitions. [2023-12-02 16:59:30,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:59:30,527 INFO L276 IsEmpty]: Start isEmpty. Operand 2032 states and 2687 transitions. [2023-12-02 16:59:30,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 16:59:30,536 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:30,536 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:30,536 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 16:59:30,536 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:30,537 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:30,537 INFO L85 PathProgramCache]: Analyzing trace with hash 918484745, now seen corresponding path program 1 times [2023-12-02 16:59:30,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:30,537 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044457006] [2023-12-02 16:59:30,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:30,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:30,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:30,681 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 16:59:30,681 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:30,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044457006] [2023-12-02 16:59:30,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044457006] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:30,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061386831] [2023-12-02 16:59:30,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:30,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:30,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:30,683 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:30,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:59:30,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:30,829 INFO L262 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:59:30,834 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:30,863 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 16:59:30,864 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:30,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061386831] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:30,864 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:30,864 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:59:30,865 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270677896] [2023-12-02 16:59:30,865 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:30,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:30,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:30,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:30,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:30,867 INFO L87 Difference]: Start difference. First operand 2032 states and 2687 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:59:31,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:31,032 INFO L93 Difference]: Finished difference Result 3828 states and 5117 transitions. [2023-12-02 16:59:31,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:31,033 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 111 [2023-12-02 16:59:31,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:31,049 INFO L225 Difference]: With dead ends: 3828 [2023-12-02 16:59:31,049 INFO L226 Difference]: Without dead ends: 2466 [2023-12-02 16:59:31,053 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:31,054 INFO L413 NwaCegarLoop]: 151 mSDtfsCounter, 56 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:31,054 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 258 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:59:31,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2466 states. [2023-12-02 16:59:31,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2466 to 2276. [2023-12-02 16:59:31,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2276 states, 1807 states have (on average 1.3519645821804096) internal successors, (2443), 1820 states have internal predecessors, (2443), 300 states have call successors, (300), 168 states have call predecessors, (300), 168 states have return successors, (300), 288 states have call predecessors, (300), 300 states have call successors, (300) [2023-12-02 16:59:31,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2276 states to 2276 states and 3043 transitions. [2023-12-02 16:59:31,210 INFO L78 Accepts]: Start accepts. Automaton has 2276 states and 3043 transitions. Word has length 111 [2023-12-02 16:59:31,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:31,211 INFO L495 AbstractCegarLoop]: Abstraction has 2276 states and 3043 transitions. [2023-12-02 16:59:31,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:59:31,211 INFO L276 IsEmpty]: Start isEmpty. Operand 2276 states and 3043 transitions. [2023-12-02 16:59:31,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 16:59:31,218 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:31,219 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:31,225 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 16:59:31,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:31,422 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:31,423 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:31,423 INFO L85 PathProgramCache]: Analyzing trace with hash -1975997047, now seen corresponding path program 2 times [2023-12-02 16:59:31,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:31,423 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811476459] [2023-12-02 16:59:31,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:31,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:31,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:31,649 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 16:59:31,649 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:31,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811476459] [2023-12-02 16:59:31,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811476459] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:31,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937550072] [2023-12-02 16:59:31,650 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:59:31,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:31,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:31,653 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:31,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:59:31,756 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 16:59:31,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:59:31,758 INFO L262 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:59:31,760 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:31,782 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:59:31,782 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:31,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937550072] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:31,782 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:31,783 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:59:31,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872472685] [2023-12-02 16:59:31,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:31,783 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:31,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:31,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:31,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:59:31,784 INFO L87 Difference]: Start difference. First operand 2276 states and 3043 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:31,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:31,965 INFO L93 Difference]: Finished difference Result 3892 states and 5313 transitions. [2023-12-02 16:59:31,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:31,965 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 111 [2023-12-02 16:59:31,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:31,975 INFO L225 Difference]: With dead ends: 3892 [2023-12-02 16:59:31,975 INFO L226 Difference]: Without dead ends: 2286 [2023-12-02 16:59:31,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:59:31,980 INFO L413 NwaCegarLoop]: 159 mSDtfsCounter, 106 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:31,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 255 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:59:31,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2286 states. [2023-12-02 16:59:32,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2286 to 2268. [2023-12-02 16:59:32,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2268 states, 1799 states have (on average 1.3312951639799888) internal successors, (2395), 1812 states have internal predecessors, (2395), 300 states have call successors, (300), 168 states have call predecessors, (300), 168 states have return successors, (300), 288 states have call predecessors, (300), 300 states have call successors, (300) [2023-12-02 16:59:32,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2268 states to 2268 states and 2995 transitions. [2023-12-02 16:59:32,072 INFO L78 Accepts]: Start accepts. Automaton has 2268 states and 2995 transitions. Word has length 111 [2023-12-02 16:59:32,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:32,073 INFO L495 AbstractCegarLoop]: Abstraction has 2268 states and 2995 transitions. [2023-12-02 16:59:32,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:32,073 INFO L276 IsEmpty]: Start isEmpty. Operand 2268 states and 2995 transitions. [2023-12-02 16:59:32,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 16:59:32,079 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:32,079 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:32,084 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 16:59:32,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:32,282 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:32,282 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:32,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1107123607, now seen corresponding path program 1 times [2023-12-02 16:59:32,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:32,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511545577] [2023-12-02 16:59:32,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:32,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:32,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:32,555 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 16:59:32,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:32,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511545577] [2023-12-02 16:59:32,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511545577] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:32,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [564201814] [2023-12-02 16:59:32,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:32,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:32,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:32,557 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:32,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:59:32,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:32,678 INFO L262 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:59:32,681 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:32,706 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:59:32,707 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:32,707 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [564201814] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:32,707 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:32,707 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:59:32,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22247742] [2023-12-02 16:59:32,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:32,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:32,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:32,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:32,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:59:32,709 INFO L87 Difference]: Start difference. First operand 2268 states and 2995 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:32,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:32,833 INFO L93 Difference]: Finished difference Result 4230 states and 5574 transitions. [2023-12-02 16:59:32,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:32,834 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 111 [2023-12-02 16:59:32,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:32,845 INFO L225 Difference]: With dead ends: 4230 [2023-12-02 16:59:32,845 INFO L226 Difference]: Without dead ends: 2716 [2023-12-02 16:59:32,849 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:59:32,850 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 104 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:32,850 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 140 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:59:32,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2716 states. [2023-12-02 16:59:32,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2716 to 2716. [2023-12-02 16:59:32,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2716 states, 2183 states have (on average 1.3005038937242328) internal successors, (2839), 2196 states have internal predecessors, (2839), 320 states have call successors, (320), 212 states have call predecessors, (320), 212 states have return successors, (320), 308 states have call predecessors, (320), 320 states have call successors, (320) [2023-12-02 16:59:33,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2716 states to 2716 states and 3479 transitions. [2023-12-02 16:59:33,001 INFO L78 Accepts]: Start accepts. Automaton has 2716 states and 3479 transitions. Word has length 111 [2023-12-02 16:59:33,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:33,002 INFO L495 AbstractCegarLoop]: Abstraction has 2716 states and 3479 transitions. [2023-12-02 16:59:33,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:33,002 INFO L276 IsEmpty]: Start isEmpty. Operand 2716 states and 3479 transitions. [2023-12-02 16:59:33,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-12-02 16:59:33,009 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:33,009 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:33,014 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:59:33,209 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:33,210 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:33,210 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:33,210 INFO L85 PathProgramCache]: Analyzing trace with hash 351831834, now seen corresponding path program 1 times [2023-12-02 16:59:33,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:33,211 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217658906] [2023-12-02 16:59:33,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:33,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:33,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:33,488 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 16:59:33,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:33,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217658906] [2023-12-02 16:59:33,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217658906] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:33,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157523216] [2023-12-02 16:59:33,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:33,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:33,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:33,490 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:33,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:59:33,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:33,619 INFO L262 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:59:33,622 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:33,652 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 16:59:33,653 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:33,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [157523216] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:33,653 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:33,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 16:59:33,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729107875] [2023-12-02 16:59:33,653 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:33,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:33,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:33,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:33,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:59:33,655 INFO L87 Difference]: Start difference. First operand 2716 states and 3479 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:33,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:33,908 INFO L93 Difference]: Finished difference Result 6482 states and 8404 transitions. [2023-12-02 16:59:33,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:33,908 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 112 [2023-12-02 16:59:33,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:33,930 INFO L225 Difference]: With dead ends: 6482 [2023-12-02 16:59:33,931 INFO L226 Difference]: Without dead ends: 3772 [2023-12-02 16:59:33,937 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:59:33,938 INFO L413 NwaCegarLoop]: 119 mSDtfsCounter, 52 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:33,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 213 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:59:33,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3772 states. [2023-12-02 16:59:34,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3772 to 3056. [2023-12-02 16:59:34,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3056 states, 2487 states have (on average 1.320064334539606) internal successors, (3283), 2501 states have internal predecessors, (3283), 338 states have call successors, (338), 230 states have call predecessors, (338), 230 states have return successors, (338), 325 states have call predecessors, (338), 338 states have call successors, (338) [2023-12-02 16:59:34,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3056 states to 3056 states and 3959 transitions. [2023-12-02 16:59:34,145 INFO L78 Accepts]: Start accepts. Automaton has 3056 states and 3959 transitions. Word has length 112 [2023-12-02 16:59:34,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:34,146 INFO L495 AbstractCegarLoop]: Abstraction has 3056 states and 3959 transitions. [2023-12-02 16:59:34,146 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:34,146 INFO L276 IsEmpty]: Start isEmpty. Operand 3056 states and 3959 transitions. [2023-12-02 16:59:34,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-12-02 16:59:34,155 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:34,155 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:34,161 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:59:34,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 16:59:34,355 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:34,356 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:34,356 INFO L85 PathProgramCache]: Analyzing trace with hash 1102848363, now seen corresponding path program 1 times [2023-12-02 16:59:34,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:34,356 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696639897] [2023-12-02 16:59:34,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:34,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:34,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:34,578 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 20 proven. 26 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-12-02 16:59:34,578 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:34,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696639897] [2023-12-02 16:59:34,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696639897] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:34,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [408624299] [2023-12-02 16:59:34,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:34,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:34,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:34,580 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:34,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:59:34,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:34,705 INFO L262 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:59:34,708 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:34,829 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:59:34,830 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:34,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [408624299] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:34,830 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:34,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-12-02 16:59:34,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167155358] [2023-12-02 16:59:34,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:34,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:59:34,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:34,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:59:34,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:59:34,832 INFO L87 Difference]: Start difference. First operand 3056 states and 3959 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:59:35,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:35,289 INFO L93 Difference]: Finished difference Result 7510 states and 9699 transitions. [2023-12-02 16:59:35,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:59:35,290 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 114 [2023-12-02 16:59:35,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:35,307 INFO L225 Difference]: With dead ends: 7510 [2023-12-02 16:59:35,308 INFO L226 Difference]: Without dead ends: 4460 [2023-12-02 16:59:35,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:59:35,314 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 271 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:35,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 286 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:59:35,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4460 states. [2023-12-02 16:59:35,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4460 to 4458. [2023-12-02 16:59:35,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4458 states, 3619 states have (on average 1.2967670627245096) internal successors, (4693), 3639 states have internal predecessors, (4693), 496 states have call successors, (496), 342 states have call predecessors, (496), 342 states have return successors, (496), 477 states have call predecessors, (496), 496 states have call successors, (496) [2023-12-02 16:59:35,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4458 states to 4458 states and 5685 transitions. [2023-12-02 16:59:35,588 INFO L78 Accepts]: Start accepts. Automaton has 4458 states and 5685 transitions. Word has length 114 [2023-12-02 16:59:35,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:35,589 INFO L495 AbstractCegarLoop]: Abstraction has 4458 states and 5685 transitions. [2023-12-02 16:59:35,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 16:59:35,589 INFO L276 IsEmpty]: Start isEmpty. Operand 4458 states and 5685 transitions. [2023-12-02 16:59:35,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2023-12-02 16:59:35,599 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:35,599 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:35,604 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 16:59:35,800 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:35,801 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:35,801 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:35,801 INFO L85 PathProgramCache]: Analyzing trace with hash -811647970, now seen corresponding path program 1 times [2023-12-02 16:59:35,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:35,801 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946412914] [2023-12-02 16:59:35,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:35,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:35,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:35,906 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 16:59:35,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:35,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946412914] [2023-12-02 16:59:35,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1946412914] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:35,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193127782] [2023-12-02 16:59:35,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:35,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:35,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:35,908 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:35,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:59:36,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:36,035 INFO L262 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:59:36,038 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:36,063 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 16:59:36,063 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:36,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193127782] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:36,063 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:36,063 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:59:36,064 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943864108] [2023-12-02 16:59:36,064 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:36,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:36,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:36,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:36,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:36,065 INFO L87 Difference]: Start difference. First operand 4458 states and 5685 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:59:36,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:36,419 INFO L93 Difference]: Finished difference Result 8468 states and 10905 transitions. [2023-12-02 16:59:36,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:36,419 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 115 [2023-12-02 16:59:36,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:36,450 INFO L225 Difference]: With dead ends: 8468 [2023-12-02 16:59:36,450 INFO L226 Difference]: Without dead ends: 5498 [2023-12-02 16:59:36,457 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:36,457 INFO L413 NwaCegarLoop]: 160 mSDtfsCounter, 59 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:36,458 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 266 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:59:36,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5498 states. [2023-12-02 16:59:36,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5498 to 5010. [2023-12-02 16:59:36,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5010 states, 4107 states have (on average 1.3102020939858778) internal successors, (5381), 4127 states have internal predecessors, (5381), 528 states have call successors, (528), 374 states have call predecessors, (528), 374 states have return successors, (528), 509 states have call predecessors, (528), 528 states have call successors, (528) [2023-12-02 16:59:36,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5010 states to 5010 states and 6437 transitions. [2023-12-02 16:59:36,841 INFO L78 Accepts]: Start accepts. Automaton has 5010 states and 6437 transitions. Word has length 115 [2023-12-02 16:59:36,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:36,842 INFO L495 AbstractCegarLoop]: Abstraction has 5010 states and 6437 transitions. [2023-12-02 16:59:36,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:59:36,842 INFO L276 IsEmpty]: Start isEmpty. Operand 5010 states and 6437 transitions. [2023-12-02 16:59:36,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-12-02 16:59:36,855 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:36,855 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:36,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 16:59:37,061 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:37,061 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:37,062 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:37,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1720223030, now seen corresponding path program 1 times [2023-12-02 16:59:37,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:37,062 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371077659] [2023-12-02 16:59:37,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:37,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:37,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:37,414 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 16:59:37,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:37,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371077659] [2023-12-02 16:59:37,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371077659] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:37,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885691343] [2023-12-02 16:59:37,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:37,415 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:37,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:37,416 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:37,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 16:59:37,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:37,564 INFO L262 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 16:59:37,568 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:37,690 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 62 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 16:59:37,690 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:59:38,092 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2023-12-02 16:59:38,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885691343] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:59:38,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1871951601] [2023-12-02 16:59:38,115 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2023-12-02 16:59:38,115 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:59:38,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:59:38,124 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:59:38,124 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:59:42,350 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 95 for LOIs [2023-12-02 16:59:42,429 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 106 for LOIs [2023-12-02 16:59:42,516 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 81 for LOIs [2023-12-02 16:59:42,551 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 16:59:42,557 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 43 for LOIs [2023-12-02 16:59:42,640 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 14 for LOIs [2023-12-02 16:59:42,668 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:59:47,228 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '90062#(and (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (not (= ~token~0 (+ 3 ~local~0))) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|))' at error location [2023-12-02 16:59:47,229 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:59:47,229 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:59:47,229 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 6] total 16 [2023-12-02 16:59:47,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535732495] [2023-12-02 16:59:47,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:59:47,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 16:59:47,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:47,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 16:59:47,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=4168, Unknown=0, NotChecked=0, Total=4556 [2023-12-02 16:59:47,233 INFO L87 Difference]: Start difference. First operand 5010 states and 6437 transitions. Second operand has 16 states, 14 states have (on average 10.285714285714286) internal successors, (144), 14 states have internal predecessors, (144), 8 states have call successors, (33), 5 states have call predecessors, (33), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2023-12-02 16:59:51,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:51,580 INFO L93 Difference]: Finished difference Result 15423 states and 20241 transitions. [2023-12-02 16:59:51,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2023-12-02 16:59:51,581 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 10.285714285714286) internal successors, (144), 14 states have internal predecessors, (144), 8 states have call successors, (33), 5 states have call predecessors, (33), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) Word has length 121 [2023-12-02 16:59:51,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:51,620 INFO L225 Difference]: With dead ends: 15423 [2023-12-02 16:59:51,620 INFO L226 Difference]: Without dead ends: 10419 [2023-12-02 16:59:51,648 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12983 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=2370, Invalid=29492, Unknown=0, NotChecked=0, Total=31862 [2023-12-02 16:59:51,649 INFO L413 NwaCegarLoop]: 362 mSDtfsCounter, 1371 mSDsluCounter, 2832 mSDsCounter, 0 mSdLazyCounter, 2112 mSolverCounterSat, 343 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1377 SdHoareTripleChecker+Valid, 3194 SdHoareTripleChecker+Invalid, 2455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 2112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:51,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1377 Valid, 3194 Invalid, 2455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [343 Valid, 2112 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-12-02 16:59:51,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10419 states. [2023-12-02 16:59:52,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10419 to 7578. [2023-12-02 16:59:52,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7578 states, 6407 states have (on average 1.282035273919151) internal successors, (8214), 6433 states have internal predecessors, (8214), 633 states have call successors, (633), 537 states have call predecessors, (633), 537 states have return successors, (633), 608 states have call predecessors, (633), 633 states have call successors, (633) [2023-12-02 16:59:52,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7578 states to 7578 states and 9480 transitions. [2023-12-02 16:59:52,327 INFO L78 Accepts]: Start accepts. Automaton has 7578 states and 9480 transitions. Word has length 121 [2023-12-02 16:59:52,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:52,328 INFO L495 AbstractCegarLoop]: Abstraction has 7578 states and 9480 transitions. [2023-12-02 16:59:52,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 10.285714285714286) internal successors, (144), 14 states have internal predecessors, (144), 8 states have call successors, (33), 5 states have call predecessors, (33), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2023-12-02 16:59:52,329 INFO L276 IsEmpty]: Start isEmpty. Operand 7578 states and 9480 transitions. [2023-12-02 16:59:52,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2023-12-02 16:59:52,344 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:52,345 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:52,351 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 16:59:52,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 16:59:52,545 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:52,546 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:52,546 INFO L85 PathProgramCache]: Analyzing trace with hash -921724650, now seen corresponding path program 1 times [2023-12-02 16:59:52,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:52,546 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905894400] [2023-12-02 16:59:52,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:52,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:52,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:52,633 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 16:59:52,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:52,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905894400] [2023-12-02 16:59:52,634 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905894400] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:52,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882571461] [2023-12-02 16:59:52,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:52,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:52,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:52,636 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:52,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 16:59:52,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:52,768 INFO L262 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:59:52,771 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:52,793 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 16:59:52,793 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:52,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882571461] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:52,794 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:52,794 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 16:59:52,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315002900] [2023-12-02 16:59:52,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:52,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:52,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:52,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:52,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:52,796 INFO L87 Difference]: Start difference. First operand 7578 states and 9480 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:59:53,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:53,252 INFO L93 Difference]: Finished difference Result 13936 states and 17559 transitions. [2023-12-02 16:59:53,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:53,252 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2023-12-02 16:59:53,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:53,267 INFO L225 Difference]: With dead ends: 13936 [2023-12-02 16:59:53,267 INFO L226 Difference]: Without dead ends: 8570 [2023-12-02 16:59:53,276 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:53,276 INFO L413 NwaCegarLoop]: 168 mSDtfsCounter, 65 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:53,277 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 276 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:59:53,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8570 states. [2023-12-02 16:59:53,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8570 to 8023. [2023-12-02 16:59:53,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8023 states, 6769 states have (on average 1.2775890087162063) internal successors, (8648), 6791 states have internal predecessors, (8648), 674 states have call successors, (674), 579 states have call predecessors, (674), 579 states have return successors, (674), 653 states have call predecessors, (674), 674 states have call successors, (674) [2023-12-02 16:59:53,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8023 states to 8023 states and 9996 transitions. [2023-12-02 16:59:53,902 INFO L78 Accepts]: Start accepts. Automaton has 8023 states and 9996 transitions. Word has length 120 [2023-12-02 16:59:53,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:53,902 INFO L495 AbstractCegarLoop]: Abstraction has 8023 states and 9996 transitions. [2023-12-02 16:59:53,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:59:53,903 INFO L276 IsEmpty]: Start isEmpty. Operand 8023 states and 9996 transitions. [2023-12-02 16:59:53,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2023-12-02 16:59:53,914 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:53,914 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:53,920 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 16:59:54,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 16:59:54,115 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:54,115 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:54,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1512117467, now seen corresponding path program 1 times [2023-12-02 16:59:54,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:54,115 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693323535] [2023-12-02 16:59:54,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:54,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:54,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:54,239 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 30 proven. 10 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 16:59:54,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:54,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693323535] [2023-12-02 16:59:54,240 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693323535] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:54,240 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998910578] [2023-12-02 16:59:54,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:54,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:54,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:54,241 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:54,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 16:59:54,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:54,363 INFO L262 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 16:59:54,365 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:54,386 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 16:59:54,386 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:54,386 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998910578] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:54,386 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:54,387 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 5 [2023-12-02 16:59:54,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499626308] [2023-12-02 16:59:54,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:54,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 16:59:54,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:54,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 16:59:54,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:59:54,388 INFO L87 Difference]: Start difference. First operand 8023 states and 9996 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:59:54,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:54,784 INFO L93 Difference]: Finished difference Result 11857 states and 14801 transitions. [2023-12-02 16:59:54,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 16:59:54,785 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 122 [2023-12-02 16:59:54,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:54,799 INFO L225 Difference]: With dead ends: 11857 [2023-12-02 16:59:54,799 INFO L226 Difference]: Without dead ends: 8312 [2023-12-02 16:59:54,806 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:54,807 INFO L413 NwaCegarLoop]: 150 mSDtfsCounter, 68 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:54,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 396 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:59:54,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8312 states. [2023-12-02 16:59:55,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8312 to 8227. [2023-12-02 16:59:55,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8227 states, 6937 states have (on average 1.2777857863629811) internal successors, (8864), 6977 states have internal predecessors, (8864), 674 states have call successors, (674), 579 states have call predecessors, (674), 615 states have return successors, (710), 671 states have call predecessors, (710), 674 states have call successors, (710) [2023-12-02 16:59:55,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8227 states to 8227 states and 10248 transitions. [2023-12-02 16:59:55,418 INFO L78 Accepts]: Start accepts. Automaton has 8227 states and 10248 transitions. Word has length 122 [2023-12-02 16:59:55,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:55,418 INFO L495 AbstractCegarLoop]: Abstraction has 8227 states and 10248 transitions. [2023-12-02 16:59:55,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:59:55,419 INFO L276 IsEmpty]: Start isEmpty. Operand 8227 states and 10248 transitions. [2023-12-02 16:59:55,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 16:59:55,430 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:55,430 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:59:55,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 16:59:55,630 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 16:59:55,631 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:55,631 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:55,631 INFO L85 PathProgramCache]: Analyzing trace with hash 988547690, now seen corresponding path program 1 times [2023-12-02 16:59:55,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:55,631 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265333668] [2023-12-02 16:59:55,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:55,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:55,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:55,685 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 31 proven. 11 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 16:59:55,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:55,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265333668] [2023-12-02 16:59:55,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265333668] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:55,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484692555] [2023-12-02 16:59:55,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:55,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:55,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:55,687 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:55,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 16:59:55,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:55,813 INFO L262 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:59:55,816 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:55,828 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 16:59:55,828 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:55,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [484692555] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:55,829 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:55,829 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 16:59:55,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41977727] [2023-12-02 16:59:55,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:55,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:55,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:55,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:55,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:59:55,830 INFO L87 Difference]: Start difference. First operand 8227 states and 10248 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:56,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:56,451 INFO L93 Difference]: Finished difference Result 11829 states and 14823 transitions. [2023-12-02 16:59:56,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:56,451 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 123 [2023-12-02 16:59:56,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:56,468 INFO L225 Difference]: With dead ends: 11829 [2023-12-02 16:59:56,468 INFO L226 Difference]: Without dead ends: 7960 [2023-12-02 16:59:56,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:59:56,475 INFO L413 NwaCegarLoop]: 117 mSDtfsCounter, 22 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:56,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 218 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:59:56,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7960 states. [2023-12-02 16:59:56,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7960 to 7549. [2023-12-02 16:59:57,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7549 states, 6367 states have (on average 1.2790953353227579) internal successors, (8144), 6380 states have internal predecessors, (8144), 638 states have call successors, (638), 543 states have call predecessors, (638), 543 states have return successors, (638), 626 states have call predecessors, (638), 638 states have call successors, (638) [2023-12-02 16:59:57,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7549 states to 7549 states and 9420 transitions. [2023-12-02 16:59:57,015 INFO L78 Accepts]: Start accepts. Automaton has 7549 states and 9420 transitions. Word has length 123 [2023-12-02 16:59:57,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:57,016 INFO L495 AbstractCegarLoop]: Abstraction has 7549 states and 9420 transitions. [2023-12-02 16:59:57,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:57,016 INFO L276 IsEmpty]: Start isEmpty. Operand 7549 states and 9420 transitions. [2023-12-02 16:59:57,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-12-02 16:59:57,025 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:57,025 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:59:57,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-12-02 16:59:57,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 16:59:57,226 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:57,226 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:57,226 INFO L85 PathProgramCache]: Analyzing trace with hash 1254966603, now seen corresponding path program 1 times [2023-12-02 16:59:57,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:57,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492186259] [2023-12-02 16:59:57,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:57,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:57,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:57,329 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 32 proven. 14 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 16:59:57,329 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:57,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492186259] [2023-12-02 16:59:57,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492186259] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:57,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317917705] [2023-12-02 16:59:57,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:57,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:57,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:57,331 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:57,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 16:59:57,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:57,458 INFO L262 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 16:59:57,460 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:57,509 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:59:57,509 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:57,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317917705] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:57,509 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:57,509 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2023-12-02 16:59:57,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051285947] [2023-12-02 16:59:57,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:57,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:57,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:57,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:57,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:57,511 INFO L87 Difference]: Start difference. First operand 7549 states and 9420 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:57,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:57,924 INFO L93 Difference]: Finished difference Result 13351 states and 16776 transitions. [2023-12-02 16:59:57,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:57,925 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 124 [2023-12-02 16:59:57,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:57,939 INFO L225 Difference]: With dead ends: 13351 [2023-12-02 16:59:57,939 INFO L226 Difference]: Without dead ends: 8049 [2023-12-02 16:59:57,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:59:57,948 INFO L413 NwaCegarLoop]: 123 mSDtfsCounter, 75 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:57,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 154 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:59:57,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8049 states. [2023-12-02 16:59:58,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8049 to 7986. [2023-12-02 16:59:58,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7986 states, 6758 states have (on average 1.2681266646936964) internal successors, (8570), 6771 states have internal predecessors, (8570), 649 states have call successors, (649), 578 states have call predecessors, (649), 578 states have return successors, (679), 637 states have call predecessors, (679), 649 states have call successors, (679) [2023-12-02 16:59:58,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7986 states to 7986 states and 9898 transitions. [2023-12-02 16:59:58,347 INFO L78 Accepts]: Start accepts. Automaton has 7986 states and 9898 transitions. Word has length 124 [2023-12-02 16:59:58,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:58,348 INFO L495 AbstractCegarLoop]: Abstraction has 7986 states and 9898 transitions. [2023-12-02 16:59:58,348 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 16:59:58,348 INFO L276 IsEmpty]: Start isEmpty. Operand 7986 states and 9898 transitions. [2023-12-02 16:59:58,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-12-02 16:59:58,356 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:58,356 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:59:58,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 16:59:58,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 16:59:58,556 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:58,557 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:58,557 INFO L85 PathProgramCache]: Analyzing trace with hash -826650995, now seen corresponding path program 1 times [2023-12-02 16:59:58,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:58,557 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982875162] [2023-12-02 16:59:58,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:58,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:58,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:58,612 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 34 proven. 5 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 16:59:58,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:58,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982875162] [2023-12-02 16:59:58,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1982875162] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:58,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862057799] [2023-12-02 16:59:58,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:58,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:58,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:58,614 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:58,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 16:59:58,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:58,743 INFO L262 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:59:58,746 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:59:58,774 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 16:59:58,774 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:59:58,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862057799] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:59:58,774 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:59:58,774 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 16:59:58,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444191662] [2023-12-02 16:59:58,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:59:58,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:59:58,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:59:58,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:59:58,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:59:58,775 INFO L87 Difference]: Start difference. First operand 7986 states and 9898 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:59:59,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:59:59,197 INFO L93 Difference]: Finished difference Result 13607 states and 17053 transitions. [2023-12-02 16:59:59,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:59:59,197 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 124 [2023-12-02 16:59:59,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:59:59,210 INFO L225 Difference]: With dead ends: 13607 [2023-12-02 16:59:59,210 INFO L226 Difference]: Without dead ends: 7983 [2023-12-02 16:59:59,218 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:59:59,218 INFO L413 NwaCegarLoop]: 192 mSDtfsCounter, 89 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:59:59,218 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 287 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:59:59,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7983 states. [2023-12-02 16:59:59,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7983 to 7853. [2023-12-02 16:59:59,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7853 states, 6625 states have (on average 1.2407547169811322) internal successors, (8220), 6638 states have internal predecessors, (8220), 649 states have call successors, (649), 578 states have call predecessors, (649), 578 states have return successors, (679), 637 states have call predecessors, (679), 649 states have call successors, (679) [2023-12-02 16:59:59,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7853 states to 7853 states and 9548 transitions. [2023-12-02 16:59:59,627 INFO L78 Accepts]: Start accepts. Automaton has 7853 states and 9548 transitions. Word has length 124 [2023-12-02 16:59:59,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:59:59,627 INFO L495 AbstractCegarLoop]: Abstraction has 7853 states and 9548 transitions. [2023-12-02 16:59:59,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:59:59,627 INFO L276 IsEmpty]: Start isEmpty. Operand 7853 states and 9548 transitions. [2023-12-02 16:59:59,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2023-12-02 16:59:59,636 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:59:59,636 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:59:59,641 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 16:59:59,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 16:59:59,837 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:59:59,837 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:59:59,837 INFO L85 PathProgramCache]: Analyzing trace with hash -497952531, now seen corresponding path program 1 times [2023-12-02 16:59:59,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:59:59,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147495360] [2023-12-02 16:59:59,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:59,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:59:59,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:59:59,974 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 17 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 16:59:59,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:59:59,974 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147495360] [2023-12-02 16:59:59,975 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147495360] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:59:59,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204929157] [2023-12-02 16:59:59,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:59:59,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:59:59,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:59:59,976 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:59:59,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 17:00:00,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:00,107 INFO L262 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 17:00:00,109 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:00:00,168 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:00:00,168 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:00:00,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [204929157] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:00:00,168 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:00:00,168 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2023-12-02 17:00:00,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947582083] [2023-12-02 17:00:00,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:00:00,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 17:00:00,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:00:00,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 17:00:00,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 17:00:00,170 INFO L87 Difference]: Start difference. First operand 7853 states and 9548 transitions. Second operand has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 17:00:00,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:00:00,868 INFO L93 Difference]: Finished difference Result 14741 states and 18011 transitions. [2023-12-02 17:00:00,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 17:00:00,869 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 126 [2023-12-02 17:00:00,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:00:00,886 INFO L225 Difference]: With dead ends: 14741 [2023-12-02 17:00:00,886 INFO L226 Difference]: Without dead ends: 9508 [2023-12-02 17:00:00,895 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-12-02 17:00:00,896 INFO L413 NwaCegarLoop]: 174 mSDtfsCounter, 193 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:00:00,896 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 383 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:00:00,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9508 states. [2023-12-02 17:00:01,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9508 to 8443. [2023-12-02 17:00:01,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8443 states, 7081 states have (on average 1.2334416042931788) internal successors, (8734), 7096 states have internal predecessors, (8734), 730 states have call successors, (730), 639 states have call predecessors, (730), 631 states have return successors, (780), 708 states have call predecessors, (780), 730 states have call successors, (780) [2023-12-02 17:00:01,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8443 states to 8443 states and 10244 transitions. [2023-12-02 17:00:01,396 INFO L78 Accepts]: Start accepts. Automaton has 8443 states and 10244 transitions. Word has length 126 [2023-12-02 17:00:01,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:00:01,396 INFO L495 AbstractCegarLoop]: Abstraction has 8443 states and 10244 transitions. [2023-12-02 17:00:01,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 17:00:01,396 INFO L276 IsEmpty]: Start isEmpty. Operand 8443 states and 10244 transitions. [2023-12-02 17:00:01,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-12-02 17:00:01,403 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:00:01,403 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:00:01,409 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 17:00:01,604 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:00:01,604 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:00:01,604 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:00:01,604 INFO L85 PathProgramCache]: Analyzing trace with hash 932517922, now seen corresponding path program 1 times [2023-12-02 17:00:01,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:00:01,604 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058044142] [2023-12-02 17:00:01,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:01,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:00:01,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:01,709 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 30 proven. 7 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 17:00:01,710 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:00:01,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058044142] [2023-12-02 17:00:01,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058044142] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:00:01,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86577473] [2023-12-02 17:00:01,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:01,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:00:01,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:00:01,711 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:00:01,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 17:00:01,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:01,836 INFO L262 TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 17:00:01,840 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:00:02,069 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 45 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 17:00:02,069 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:00:02,240 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 17:00:02,241 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86577473] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 17:00:02,241 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:00:02,241 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 8] total 13 [2023-12-02 17:00:02,241 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29307102] [2023-12-02 17:00:02,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:00:02,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 17:00:02,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:00:02,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 17:00:02,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-12-02 17:00:02,243 INFO L87 Difference]: Start difference. First operand 8443 states and 10244 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 3 states have call successors, (9), 1 states have call predecessors, (9), 3 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 17:00:02,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:00:02,749 INFO L93 Difference]: Finished difference Result 13272 states and 16217 transitions. [2023-12-02 17:00:02,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 17:00:02,749 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 3 states have call successors, (9), 1 states have call predecessors, (9), 3 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) Word has length 121 [2023-12-02 17:00:02,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:00:02,761 INFO L225 Difference]: With dead ends: 13272 [2023-12-02 17:00:02,761 INFO L226 Difference]: Without dead ends: 8867 [2023-12-02 17:00:02,767 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-12-02 17:00:02,768 INFO L413 NwaCegarLoop]: 145 mSDtfsCounter, 99 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:00:02,768 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 279 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:00:02,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8867 states. [2023-12-02 17:00:03,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8867 to 8798. [2023-12-02 17:00:03,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8798 states, 7393 states have (on average 1.222643040714189) internal successors, (9039), 7420 states have internal predecessors, (9039), 736 states have call successors, (736), 659 states have call predecessors, (736), 668 states have return successors, (793), 719 states have call predecessors, (793), 736 states have call successors, (793) [2023-12-02 17:00:03,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8798 states to 8798 states and 10568 transitions. [2023-12-02 17:00:03,282 INFO L78 Accepts]: Start accepts. Automaton has 8798 states and 10568 transitions. Word has length 121 [2023-12-02 17:00:03,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:00:03,282 INFO L495 AbstractCegarLoop]: Abstraction has 8798 states and 10568 transitions. [2023-12-02 17:00:03,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 3 states have call successors, (9), 1 states have call predecessors, (9), 3 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 17:00:03,283 INFO L276 IsEmpty]: Start isEmpty. Operand 8798 states and 10568 transitions. [2023-12-02 17:00:03,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2023-12-02 17:00:03,288 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:00:03,288 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:00:03,294 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 17:00:03,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:00:03,489 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:00:03,489 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:00:03,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1394978181, now seen corresponding path program 1 times [2023-12-02 17:00:03,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:00:03,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37960642] [2023-12-02 17:00:03,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:03,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:00:03,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:03,705 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 17 proven. 26 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 17:00:03,705 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:00:03,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37960642] [2023-12-02 17:00:03,706 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37960642] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:00:03,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780122248] [2023-12-02 17:00:03,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:03,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:00:03,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:00:03,707 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:00:03,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 17:00:03,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:03,849 INFO L262 TraceCheckSpWp]: Trace formula consists of 595 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 17:00:03,852 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:00:03,989 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 62 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 17:00:03,990 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:00:04,290 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2023-12-02 17:00:04,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780122248] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:00:04,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [83488460] [2023-12-02 17:00:04,294 INFO L159 IcfgInterpreter]: Started Sifa with 74 locations of interest [2023-12-02 17:00:04,294 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:00:04,295 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:00:04,295 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:00:04,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:00:07,883 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 95 for LOIs [2023-12-02 17:00:07,940 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 106 for LOIs [2023-12-02 17:00:08,017 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 81 for LOIs [2023-12-02 17:00:08,051 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 17:00:08,058 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 43 for LOIs [2023-12-02 17:00:08,107 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 14 for LOIs [2023-12-02 17:00:08,197 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:00:13,785 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '304956#(and (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (not (= ~token~0 (+ 3 ~local~0))) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|))' at error location [2023-12-02 17:00:13,785 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:00:13,785 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:00:13,785 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 6] total 17 [2023-12-02 17:00:13,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046074285] [2023-12-02 17:00:13,785 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:00:13,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 17:00:13,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:00:13,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 17:00:13,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=4899, Unknown=0, NotChecked=0, Total=5402 [2023-12-02 17:00:13,789 INFO L87 Difference]: Start difference. First operand 8798 states and 10568 transitions. Second operand has 17 states, 14 states have (on average 10.142857142857142) internal successors, (142), 15 states have internal predecessors, (142), 7 states have call successors, (30), 4 states have call predecessors, (30), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 17:00:19,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:00:19,840 INFO L93 Difference]: Finished difference Result 23220 states and 29160 transitions. [2023-12-02 17:00:19,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 191 states. [2023-12-02 17:00:19,841 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 10.142857142857142) internal successors, (142), 15 states have internal predecessors, (142), 7 states have call successors, (30), 4 states have call predecessors, (30), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) Word has length 126 [2023-12-02 17:00:19,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:00:19,862 INFO L225 Difference]: With dead ends: 23220 [2023-12-02 17:00:19,862 INFO L226 Difference]: Without dead ends: 15424 [2023-12-02 17:00:19,880 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 666 GetRequests, 416 SyntacticMatches, 0 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27511 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=4636, Invalid=58616, Unknown=0, NotChecked=0, Total=63252 [2023-12-02 17:00:19,881 INFO L413 NwaCegarLoop]: 684 mSDtfsCounter, 2370 mSDsluCounter, 4208 mSDsCounter, 0 mSdLazyCounter, 2687 mSolverCounterSat, 406 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2379 SdHoareTripleChecker+Valid, 4892 SdHoareTripleChecker+Invalid, 3093 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 406 IncrementalHoareTripleChecker+Valid, 2687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-12-02 17:00:19,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2379 Valid, 4892 Invalid, 3093 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [406 Valid, 2687 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-12-02 17:00:19,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15424 states. [2023-12-02 17:00:20,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15424 to 6704. [2023-12-02 17:00:20,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6704 states, 5685 states have (on average 1.2212840809146879) internal successors, (6943), 5704 states have internal predecessors, (6943), 520 states have call successors, (520), 491 states have call predecessors, (520), 498 states have return successors, (563), 509 states have call predecessors, (563), 520 states have call successors, (563) [2023-12-02 17:00:20,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6704 states to 6704 states and 8026 transitions. [2023-12-02 17:00:20,519 INFO L78 Accepts]: Start accepts. Automaton has 6704 states and 8026 transitions. Word has length 126 [2023-12-02 17:00:20,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:00:20,519 INFO L495 AbstractCegarLoop]: Abstraction has 6704 states and 8026 transitions. [2023-12-02 17:00:20,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 10.142857142857142) internal successors, (142), 15 states have internal predecessors, (142), 7 states have call successors, (30), 4 states have call predecessors, (30), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 17:00:20,519 INFO L276 IsEmpty]: Start isEmpty. Operand 6704 states and 8026 transitions. [2023-12-02 17:00:20,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2023-12-02 17:00:20,525 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:00:20,525 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:00:20,530 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 17:00:20,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 17:00:20,725 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:00:20,726 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:00:20,726 INFO L85 PathProgramCache]: Analyzing trace with hash -2121324658, now seen corresponding path program 1 times [2023-12-02 17:00:20,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:00:20,726 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162201761] [2023-12-02 17:00:20,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:20,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:00:20,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:20,917 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 17:00:20,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:00:20,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162201761] [2023-12-02 17:00:20,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162201761] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:00:20,918 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:00:20,918 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 17:00:20,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97339813] [2023-12-02 17:00:20,918 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:00:20,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:00:20,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:00:20,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:00:20,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:00:20,920 INFO L87 Difference]: Start difference. First operand 6704 states and 8026 transitions. Second operand has 5 states, 5 states have (on average 16.6) internal successors, (83), 5 states have internal predecessors, (83), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 17:00:21,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:00:21,717 INFO L93 Difference]: Finished difference Result 11629 states and 13945 transitions. [2023-12-02 17:00:21,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 17:00:21,718 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.6) internal successors, (83), 5 states have internal predecessors, (83), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 122 [2023-12-02 17:00:21,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:00:21,728 INFO L225 Difference]: With dead ends: 11629 [2023-12-02 17:00:21,728 INFO L226 Difference]: Without dead ends: 8066 [2023-12-02 17:00:21,732 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-12-02 17:00:21,732 INFO L413 NwaCegarLoop]: 163 mSDtfsCounter, 84 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:00:21,733 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 377 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:00:21,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8066 states. [2023-12-02 17:00:22,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8066 to 7662. [2023-12-02 17:00:22,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7662 states, 6465 states have (on average 1.2190255220417634) internal successors, (7881), 6481 states have internal predecessors, (7881), 616 states have call successors, (616), 575 states have call predecessors, (616), 580 states have return successors, (680), 606 states have call predecessors, (680), 616 states have call successors, (680) [2023-12-02 17:00:22,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7662 states to 7662 states and 9177 transitions. [2023-12-02 17:00:22,296 INFO L78 Accepts]: Start accepts. Automaton has 7662 states and 9177 transitions. Word has length 122 [2023-12-02 17:00:22,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:00:22,296 INFO L495 AbstractCegarLoop]: Abstraction has 7662 states and 9177 transitions. [2023-12-02 17:00:22,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.6) internal successors, (83), 5 states have internal predecessors, (83), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 17:00:22,297 INFO L276 IsEmpty]: Start isEmpty. Operand 7662 states and 9177 transitions. [2023-12-02 17:00:22,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-12-02 17:00:22,300 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:00:22,300 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:00:22,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-12-02 17:00:22,300 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:00:22,301 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:00:22,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1123696892, now seen corresponding path program 1 times [2023-12-02 17:00:22,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:00:22,301 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910290396] [2023-12-02 17:00:22,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:22,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:00:22,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:22,494 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 17 proven. 25 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2023-12-02 17:00:22,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:00:22,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910290396] [2023-12-02 17:00:22,495 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910290396] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:00:22,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730409277] [2023-12-02 17:00:22,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:22,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:00:22,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:00:22,496 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:00:22,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 17:00:22,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:22,623 INFO L262 TraceCheckSpWp]: Trace formula consists of 605 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 17:00:22,625 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:00:22,766 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 60 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 17:00:22,767 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:00:23,033 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-12-02 17:00:23,034 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730409277] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:00:23,034 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [502330961] [2023-12-02 17:00:23,036 INFO L159 IcfgInterpreter]: Started Sifa with 77 locations of interest [2023-12-02 17:00:23,036 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:00:23,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:00:23,037 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:00:23,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:00:28,241 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 95 for LOIs [2023-12-02 17:00:28,299 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 106 for LOIs [2023-12-02 17:00:28,376 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 81 for LOIs [2023-12-02 17:00:28,411 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 17:00:28,417 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 43 for LOIs [2023-12-02 17:00:28,572 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 14 for LOIs [2023-12-02 17:00:28,661 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:00:37,405 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '366691#(and (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (not (= ~token~0 (+ 3 ~local~0))) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|))' at error location [2023-12-02 17:00:37,405 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:00:37,405 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:00:37,405 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 6] total 18 [2023-12-02 17:00:37,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23912967] [2023-12-02 17:00:37,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:00:37,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 17:00:37,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:00:37,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 17:00:37,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=5499, Unknown=0, NotChecked=0, Total=6006 [2023-12-02 17:00:37,408 INFO L87 Difference]: Start difference. First operand 7662 states and 9177 transitions. Second operand has 18 states, 15 states have (on average 9.666666666666666) internal successors, (145), 16 states have internal predecessors, (145), 7 states have call successors, (30), 4 states have call predecessors, (30), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 17:00:43,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:00:43,164 INFO L93 Difference]: Finished difference Result 16575 states and 20385 transitions. [2023-12-02 17:00:43,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2023-12-02 17:00:43,165 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 9.666666666666666) internal successors, (145), 16 states have internal predecessors, (145), 7 states have call successors, (30), 4 states have call predecessors, (30), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) Word has length 128 [2023-12-02 17:00:43,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:00:43,177 INFO L225 Difference]: With dead ends: 16575 [2023-12-02 17:00:43,177 INFO L226 Difference]: Without dead ends: 10231 [2023-12-02 17:00:43,189 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 631 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24508 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=4027, Invalid=52855, Unknown=0, NotChecked=0, Total=56882 [2023-12-02 17:00:43,189 INFO L413 NwaCegarLoop]: 619 mSDtfsCounter, 2124 mSDsluCounter, 4957 mSDsCounter, 0 mSdLazyCounter, 3700 mSolverCounterSat, 454 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2132 SdHoareTripleChecker+Valid, 5576 SdHoareTripleChecker+Invalid, 4154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 454 IncrementalHoareTripleChecker+Valid, 3700 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-12-02 17:00:43,189 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2132 Valid, 5576 Invalid, 4154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [454 Valid, 3700 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-12-02 17:00:43,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10231 states. [2023-12-02 17:00:43,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10231 to 6102. [2023-12-02 17:00:43,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6102 states, 5143 states have (on average 1.20824421543846) internal successors, (6214), 5157 states have internal predecessors, (6214), 487 states have call successors, (487), 464 states have call predecessors, (487), 471 states have return successors, (545), 481 states have call predecessors, (545), 487 states have call successors, (545) [2023-12-02 17:00:43,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6102 states to 6102 states and 7246 transitions. [2023-12-02 17:00:43,677 INFO L78 Accepts]: Start accepts. Automaton has 6102 states and 7246 transitions. Word has length 128 [2023-12-02 17:00:43,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:00:43,677 INFO L495 AbstractCegarLoop]: Abstraction has 6102 states and 7246 transitions. [2023-12-02 17:00:43,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 9.666666666666666) internal successors, (145), 16 states have internal predecessors, (145), 7 states have call successors, (30), 4 states have call predecessors, (30), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 17:00:43,678 INFO L276 IsEmpty]: Start isEmpty. Operand 6102 states and 7246 transitions. [2023-12-02 17:00:43,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-12-02 17:00:43,680 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:00:43,681 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:00:43,685 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 17:00:43,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 17:00:43,881 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:00:43,881 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:00:43,882 INFO L85 PathProgramCache]: Analyzing trace with hash -888836539, now seen corresponding path program 1 times [2023-12-02 17:00:43,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:00:43,882 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045953707] [2023-12-02 17:00:43,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:43,882 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:00:43,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:44,368 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 31 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 17:00:44,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:00:44,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045953707] [2023-12-02 17:00:44,368 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045953707] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:00:44,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477016250] [2023-12-02 17:00:44,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:00:44,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:00:44,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:00:44,369 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:00:44,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 17:00:44,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:00:44,485 INFO L262 TraceCheckSpWp]: Trace formula consists of 615 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 17:00:44,489 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:00:44,767 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 56 proven. 2 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 17:00:44,767 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:00:45,318 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 27 proven. 7 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 17:00:45,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477016250] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:00:45,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [969942792] [2023-12-02 17:00:45,321 INFO L159 IcfgInterpreter]: Started Sifa with 80 locations of interest [2023-12-02 17:00:45,321 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:00:45,322 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:00:45,322 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:00:45,322 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:00:53,905 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 1 for LOIs [2023-12-02 17:00:53,909 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 1 for LOIs [2023-12-02 17:00:53,915 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 17:00:53,915 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 17:00:53,923 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 43 for LOIs [2023-12-02 17:00:53,985 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 17:00:54,106 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:01:01,529 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '395836#(and (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (not (= ~token~0 (+ 3 ~local~0))) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|))' at error location [2023-12-02 17:01:01,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:01:01,530 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:01:01,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 12] total 36 [2023-12-02 17:01:01,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74635156] [2023-12-02 17:01:01,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:01:01,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 17:01:01,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:01:01,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 17:01:01,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=8874, Unknown=0, NotChecked=0, Total=9506 [2023-12-02 17:01:01,533 INFO L87 Difference]: Start difference. First operand 6102 states and 7246 transitions. Second operand has 36 states, 24 states have (on average 8.791666666666666) internal successors, (211), 27 states have internal predecessors, (211), 14 states have call successors, (40), 11 states have call predecessors, (40), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40) [2023-12-02 17:01:06,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:01:06,147 INFO L93 Difference]: Finished difference Result 15820 states and 19164 transitions. [2023-12-02 17:01:06,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2023-12-02 17:01:06,148 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 24 states have (on average 8.791666666666666) internal successors, (211), 27 states have internal predecessors, (211), 14 states have call successors, (40), 11 states have call predecessors, (40), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40) Word has length 130 [2023-12-02 17:01:06,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:01:06,160 INFO L225 Difference]: With dead ends: 15820 [2023-12-02 17:01:06,160 INFO L226 Difference]: Without dead ends: 10759 [2023-12-02 17:01:06,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 330 SyntacticMatches, 1 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8933 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=2297, Invalid=22509, Unknown=0, NotChecked=0, Total=24806 [2023-12-02 17:01:06,167 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 4165 mSDsluCounter, 928 mSDsCounter, 0 mSdLazyCounter, 2103 mSolverCounterSat, 1450 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4165 SdHoareTripleChecker+Valid, 1009 SdHoareTripleChecker+Invalid, 3553 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1450 IncrementalHoareTripleChecker+Valid, 2103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 17:01:06,168 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4165 Valid, 1009 Invalid, 3553 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1450 Valid, 2103 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 17:01:06,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10759 states. [2023-12-02 17:01:06,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10759 to 5811. [2023-12-02 17:01:06,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5811 states, 4903 states have (on average 1.2057923720171324) internal successors, (5912), 4915 states have internal predecessors, (5912), 467 states have call successors, (467), 440 states have call predecessors, (467), 440 states have return successors, (467), 456 states have call predecessors, (467), 467 states have call successors, (467) [2023-12-02 17:01:06,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5811 states to 5811 states and 6846 transitions. [2023-12-02 17:01:06,752 INFO L78 Accepts]: Start accepts. Automaton has 5811 states and 6846 transitions. Word has length 130 [2023-12-02 17:01:06,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:01:06,752 INFO L495 AbstractCegarLoop]: Abstraction has 5811 states and 6846 transitions. [2023-12-02 17:01:06,752 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 24 states have (on average 8.791666666666666) internal successors, (211), 27 states have internal predecessors, (211), 14 states have call successors, (40), 11 states have call predecessors, (40), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40) [2023-12-02 17:01:06,753 INFO L276 IsEmpty]: Start isEmpty. Operand 5811 states and 6846 transitions. [2023-12-02 17:01:06,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 17:01:06,756 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:01:06,756 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:01:06,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 17:01:06,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 17:01:06,957 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:01:06,957 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:01:06,957 INFO L85 PathProgramCache]: Analyzing trace with hash -2122346067, now seen corresponding path program 1 times [2023-12-02 17:01:06,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:01:06,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590786712] [2023-12-02 17:01:06,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:06,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:01:06,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:07,071 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 34 proven. 20 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2023-12-02 17:01:07,072 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:01:07,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590786712] [2023-12-02 17:01:07,072 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [590786712] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:01:07,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404254180] [2023-12-02 17:01:07,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:07,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:01:07,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:01:07,073 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:01:07,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 17:01:07,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:07,192 INFO L262 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 17:01:07,195 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:01:07,236 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 17:01:07,236 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:01:07,236 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404254180] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:01:07,236 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:01:07,237 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2023-12-02 17:01:07,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380945084] [2023-12-02 17:01:07,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:01:07,237 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:01:07,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:01:07,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:01:07,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 17:01:07,238 INFO L87 Difference]: Start difference. First operand 5811 states and 6846 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 17:01:07,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:01:07,828 INFO L93 Difference]: Finished difference Result 11211 states and 13316 transitions. [2023-12-02 17:01:07,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:01:07,829 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 148 [2023-12-02 17:01:07,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:01:07,835 INFO L225 Difference]: With dead ends: 11211 [2023-12-02 17:01:07,835 INFO L226 Difference]: Without dead ends: 6099 [2023-12-02 17:01:07,839 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 17:01:07,840 INFO L413 NwaCegarLoop]: 122 mSDtfsCounter, 76 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:01:07,840 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 151 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:01:07,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6099 states. [2023-12-02 17:01:08,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6099 to 5917. [2023-12-02 17:01:08,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5917 states, 5003 states have (on average 1.1918848690785528) internal successors, (5963), 5015 states have internal predecessors, (5963), 467 states have call successors, (467), 446 states have call predecessors, (467), 446 states have return successors, (477), 456 states have call predecessors, (477), 467 states have call successors, (477) [2023-12-02 17:01:08,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5917 states to 5917 states and 6907 transitions. [2023-12-02 17:01:08,390 INFO L78 Accepts]: Start accepts. Automaton has 5917 states and 6907 transitions. Word has length 148 [2023-12-02 17:01:08,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:01:08,390 INFO L495 AbstractCegarLoop]: Abstraction has 5917 states and 6907 transitions. [2023-12-02 17:01:08,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 17:01:08,390 INFO L276 IsEmpty]: Start isEmpty. Operand 5917 states and 6907 transitions. [2023-12-02 17:01:08,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 17:01:08,392 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:01:08,392 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:01:08,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 17:01:08,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 17:01:08,593 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:01:08,593 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:01:08,593 INFO L85 PathProgramCache]: Analyzing trace with hash -598391956, now seen corresponding path program 1 times [2023-12-02 17:01:08,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:01:08,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452188048] [2023-12-02 17:01:08,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:08,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:01:08,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:08,630 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 39 proven. 17 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2023-12-02 17:01:08,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:01:08,631 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452188048] [2023-12-02 17:01:08,631 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452188048] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:01:08,631 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732546947] [2023-12-02 17:01:08,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:08,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:01:08,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:01:08,632 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:01:08,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 17:01:08,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:08,743 INFO L262 TraceCheckSpWp]: Trace formula consists of 635 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 17:01:08,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:01:08,769 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 96 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 17:01:08,770 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:01:08,770 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732546947] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:01:08,770 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:01:08,770 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 17:01:08,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635420784] [2023-12-02 17:01:08,770 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:01:08,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:01:08,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:01:08,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:01:08,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:01:08,771 INFO L87 Difference]: Start difference. First operand 5917 states and 6907 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-12-02 17:01:09,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:01:09,374 INFO L93 Difference]: Finished difference Result 10777 states and 12775 transitions. [2023-12-02 17:01:09,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:01:09,375 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 148 [2023-12-02 17:01:09,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:01:09,380 INFO L225 Difference]: With dead ends: 10777 [2023-12-02 17:01:09,381 INFO L226 Difference]: Without dead ends: 5556 [2023-12-02 17:01:09,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:01:09,385 INFO L413 NwaCegarLoop]: 165 mSDtfsCounter, 87 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:01:09,385 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 250 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:01:09,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5556 states. [2023-12-02 17:01:09,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5556 to 5456. [2023-12-02 17:01:09,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5456 states, 4588 states have (on average 1.151482127288579) internal successors, (5283), 4600 states have internal predecessors, (5283), 444 states have call successors, (444), 423 states have call predecessors, (444), 423 states have return successors, (454), 433 states have call predecessors, (454), 444 states have call successors, (454) [2023-12-02 17:01:09,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5456 states to 5456 states and 6181 transitions. [2023-12-02 17:01:09,889 INFO L78 Accepts]: Start accepts. Automaton has 5456 states and 6181 transitions. Word has length 148 [2023-12-02 17:01:09,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:01:09,889 INFO L495 AbstractCegarLoop]: Abstraction has 5456 states and 6181 transitions. [2023-12-02 17:01:09,889 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-12-02 17:01:09,889 INFO L276 IsEmpty]: Start isEmpty. Operand 5456 states and 6181 transitions. [2023-12-02 17:01:09,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2023-12-02 17:01:09,891 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:01:09,892 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:01:09,896 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 17:01:10,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 17:01:10,092 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:01:10,092 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:01:10,092 INFO L85 PathProgramCache]: Analyzing trace with hash -285780949, now seen corresponding path program 1 times [2023-12-02 17:01:10,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:01:10,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528070762] [2023-12-02 17:01:10,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:10,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:01:10,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:10,299 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 47 proven. 36 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 17:01:10,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:01:10,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528070762] [2023-12-02 17:01:10,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528070762] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:01:10,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125230755] [2023-12-02 17:01:10,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:10,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:01:10,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:01:10,301 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:01:10,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 17:01:10,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:10,433 INFO L262 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 17:01:10,435 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:01:10,486 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 115 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 17:01:10,486 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:01:10,486 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2125230755] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:01:10,486 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:01:10,486 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2023-12-02 17:01:10,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385868786] [2023-12-02 17:01:10,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:01:10,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 17:01:10,487 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:01:10,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 17:01:10,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 17:01:10,487 INFO L87 Difference]: Start difference. First operand 5456 states and 6181 transitions. Second operand has 6 states, 6 states have (on average 18.666666666666668) internal successors, (112), 6 states have internal predecessors, (112), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 17:01:11,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:01:11,364 INFO L93 Difference]: Finished difference Result 11145 states and 12696 transitions. [2023-12-02 17:01:11,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 17:01:11,364 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.666666666666668) internal successors, (112), 6 states have internal predecessors, (112), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 151 [2023-12-02 17:01:11,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:01:11,374 INFO L225 Difference]: With dead ends: 11145 [2023-12-02 17:01:11,374 INFO L226 Difference]: Without dead ends: 6477 [2023-12-02 17:01:11,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-12-02 17:01:11,380 INFO L413 NwaCegarLoop]: 159 mSDtfsCounter, 208 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:01:11,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 362 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:01:11,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6477 states. [2023-12-02 17:01:11,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6477 to 5939. [2023-12-02 17:01:11,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5939 states, 4937 states have (on average 1.14097630139761) internal successors, (5633), 4956 states have internal predecessors, (5633), 514 states have call successors, (514), 477 states have call predecessors, (514), 487 states have return successors, (564), 506 states have call predecessors, (564), 514 states have call successors, (564) [2023-12-02 17:01:11,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5939 states to 5939 states and 6711 transitions. [2023-12-02 17:01:11,968 INFO L78 Accepts]: Start accepts. Automaton has 5939 states and 6711 transitions. Word has length 151 [2023-12-02 17:01:11,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:01:11,968 INFO L495 AbstractCegarLoop]: Abstraction has 5939 states and 6711 transitions. [2023-12-02 17:01:11,968 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.666666666666668) internal successors, (112), 6 states have internal predecessors, (112), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 17:01:11,968 INFO L276 IsEmpty]: Start isEmpty. Operand 5939 states and 6711 transitions. [2023-12-02 17:01:11,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2023-12-02 17:01:11,971 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:01:11,971 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:01:11,977 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 17:01:12,171 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:01:12,172 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:01:12,172 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:01:12,172 INFO L85 PathProgramCache]: Analyzing trace with hash -1974795817, now seen corresponding path program 1 times [2023-12-02 17:01:12,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:01:12,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269590148] [2023-12-02 17:01:12,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:12,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:01:12,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:12,326 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2023-12-02 17:01:12,326 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:01:12,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269590148] [2023-12-02 17:01:12,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269590148] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:01:12,327 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:01:12,327 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 17:01:12,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355804150] [2023-12-02 17:01:12,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:01:12,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 17:01:12,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:01:12,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 17:01:12,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 17:01:12,329 INFO L87 Difference]: Start difference. First operand 5939 states and 6711 transitions. Second operand has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 5 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 17:01:14,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:01:14,639 INFO L93 Difference]: Finished difference Result 19931 states and 22669 transitions. [2023-12-02 17:01:14,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:01:14,639 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 5 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 180 [2023-12-02 17:01:14,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:01:14,658 INFO L225 Difference]: With dead ends: 19931 [2023-12-02 17:01:14,658 INFO L226 Difference]: Without dead ends: 17010 [2023-12-02 17:01:14,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 17:01:14,662 INFO L413 NwaCegarLoop]: 352 mSDtfsCounter, 377 mSDsluCounter, 764 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 377 SdHoareTripleChecker+Valid, 1116 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:01:14,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [377 Valid, 1116 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 615 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 17:01:14,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17010 states. [2023-12-02 17:01:15,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17010 to 10205. [2023-12-02 17:01:15,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10205 states, 8429 states have (on average 1.140230157788587) internal successors, (9611), 8458 states have internal predecessors, (9611), 920 states have call successors, (920), 836 states have call predecessors, (920), 855 states have return successors, (1022), 911 states have call predecessors, (1022), 920 states have call successors, (1022) [2023-12-02 17:01:15,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10205 states to 10205 states and 11553 transitions. [2023-12-02 17:01:15,850 INFO L78 Accepts]: Start accepts. Automaton has 10205 states and 11553 transitions. Word has length 180 [2023-12-02 17:01:15,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:01:15,850 INFO L495 AbstractCegarLoop]: Abstraction has 10205 states and 11553 transitions. [2023-12-02 17:01:15,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 5 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 17:01:15,850 INFO L276 IsEmpty]: Start isEmpty. Operand 10205 states and 11553 transitions. [2023-12-02 17:01:15,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2023-12-02 17:01:15,855 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:01:15,855 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:01:15,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2023-12-02 17:01:15,855 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:01:15,856 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:01:15,856 INFO L85 PathProgramCache]: Analyzing trace with hash -400512884, now seen corresponding path program 1 times [2023-12-02 17:01:15,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:01:15,856 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144473352] [2023-12-02 17:01:15,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:15,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:01:15,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:16,395 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 42 proven. 75 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2023-12-02 17:01:16,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:01:16,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144473352] [2023-12-02 17:01:16,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144473352] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:01:16,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [511785929] [2023-12-02 17:01:16,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:01:16,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:01:16,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:01:16,397 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:01:16,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f28b5fcb-868c-435b-a10e-23caa456d089/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 17:01:16,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:01:16,523 INFO L262 TraceCheckSpWp]: Trace formula consists of 845 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 17:01:16,526 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:01:16,681 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 139 proven. 2 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2023-12-02 17:01:16,681 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:01:17,038 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 50 proven. 19 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2023-12-02 17:01:17,039 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [511785929] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:01:17,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1885798298] [2023-12-02 17:01:17,042 INFO L159 IcfgInterpreter]: Started Sifa with 86 locations of interest [2023-12-02 17:01:17,042 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:01:17,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:01:17,042 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:01:17,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs