./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ --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 4548c451706b7658e6a882e8eef66dc3c360e6aea0e4326d7cc0b87e2b58239c --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:56:34,678 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:56:34,778 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:56:34,784 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:56:34,785 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:56:34,809 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:56:34,810 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:56:34,811 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:56:34,812 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:56:34,812 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:56:34,813 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:56:34,813 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:56:34,814 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:56:34,815 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:56:34,815 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:56:34,816 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:56:34,816 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:56:34,817 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:56:34,817 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:56:34,818 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:56:34,818 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:56:34,819 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:56:34,820 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:56:34,820 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:56:34,821 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:56:34,821 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:56:34,822 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:56:34,822 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:56:34,822 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:56:34,823 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:56:34,823 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:56:34,824 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:56:34,824 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:56:34,825 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:56:34,825 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:56:34,826 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:56:34,826 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:56:34,826 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:56:34,827 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:56:34,827 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:56:34,828 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:56:34,828 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:56:34,829 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:56:34,829 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:56:34,829 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:56:34,830 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_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4548c451706b7658e6a882e8eef66dc3c360e6aea0e4326d7cc0b87e2b58239c [2023-11-19 04:56:35,147 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:56:35,181 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:56:35,184 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:56:35,185 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:56:35,187 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:56:35,189 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c [2023-11-19 04:56:38,353 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:56:38,580 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:56:38,580 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c [2023-11-19 04:56:38,588 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/data/f0e06f5cc/f7e2850c53254cc6918d49cbf15ed345/FLAGd154a14af [2023-11-19 04:56:38,604 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/data/f0e06f5cc/f7e2850c53254cc6918d49cbf15ed345 [2023-11-19 04:56:38,607 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:56:38,609 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:56:38,610 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:56:38,611 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:56:38,616 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:56:38,617 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:38,618 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bd216c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38, skipping insertion in model container [2023-11-19 04:56:38,619 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:38,639 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:56:38,848 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_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c[318,331] [2023-11-19 04:56:38,867 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:56:38,878 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:56:38,930 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_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/sv-benchmarks/c/loops-crafted-1/mono-crafted_3.c[318,331] [2023-11-19 04:56:38,935 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:56:38,954 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:56:38,981 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38 WrapperNode [2023-11-19 04:56:38,981 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:56:38,983 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:56:38,983 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:56:38,983 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:56:38,991 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,019 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,040 INFO L138 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 46 [2023-11-19 04:56:39,040 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:56:39,041 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:56:39,041 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:56:39,041 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:56:39,050 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,051 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,053 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,053 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,068 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,073 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,078 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,079 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,081 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:56:39,082 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:56:39,082 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:56:39,082 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:56:39,085 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (1/1) ... [2023-11-19 04:56:39,091 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:56:39,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:56:39,121 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:56:39,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:56:39,166 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:56:39,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:56:39,166 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:56:39,166 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:56:39,241 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:56:39,243 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:56:39,373 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:56:39,412 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:56:39,412 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 04:56:39,416 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:56:39 BoogieIcfgContainer [2023-11-19 04:56:39,417 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:56:39,420 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:56:39,420 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:56:39,423 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:56:39,423 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:56:38" (1/3) ... [2023-11-19 04:56:39,424 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@454541e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:56:39, skipping insertion in model container [2023-11-19 04:56:39,424 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:56:38" (2/3) ... [2023-11-19 04:56:39,425 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@454541e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:56:39, skipping insertion in model container [2023-11-19 04:56:39,425 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:56:39" (3/3) ... [2023-11-19 04:56:39,426 INFO L112 eAbstractionObserver]: Analyzing ICFG mono-crafted_3.c [2023-11-19 04:56:39,447 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:56:39,447 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:56:39,499 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:56:39,507 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;@34b014f1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:56:39,507 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:56:39,512 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:39,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-19 04:56:39,518 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:56:39,519 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-19 04:56:39,520 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:56:39,526 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:56:39,526 INFO L85 PathProgramCache]: Analyzing trace with hash 73603151, now seen corresponding path program 1 times [2023-11-19 04:56:39,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:56:39,538 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643569468] [2023-11-19 04:56:39,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:39,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:56:39,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:39,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:56:39,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:56:39,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643569468] [2023-11-19 04:56:39,747 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643569468] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:56:39,748 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:56:39,748 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:56:39,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024244414] [2023-11-19 04:56:39,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:56:39,755 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:56:39,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:56:39,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:56:39,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:56:39,789 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:39,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:56:39,835 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2023-11-19 04:56:39,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:56:39,852 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-19 04:56:39,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:56:39,860 INFO L225 Difference]: With dead ends: 15 [2023-11-19 04:56:39,861 INFO L226 Difference]: Without dead ends: 7 [2023-11-19 04:56:39,863 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 [2023-11-19 04:56:39,867 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:56:39,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:56:39,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2023-11-19 04:56:39,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2023-11-19 04:56:39,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:39,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2023-11-19 04:56:39,897 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2023-11-19 04:56:39,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:56:39,898 INFO L495 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2023-11-19 04:56:39,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:39,898 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2023-11-19 04:56:39,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 04:56:39,899 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:56:39,899 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 04:56:39,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:56:39,900 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:56:39,901 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:56:39,901 INFO L85 PathProgramCache]: Analyzing trace with hash -2011378392, now seen corresponding path program 1 times [2023-11-19 04:56:39,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:56:39,901 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202318284] [2023-11-19 04:56:39,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:39,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:56:39,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:40,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:56:40,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:56:40,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202318284] [2023-11-19 04:56:40,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202318284] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:56:40,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419992241] [2023-11-19 04:56:40,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:40,024 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:40,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:56:40,027 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:56:40,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:56:40,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:40,076 INFO L262 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 04:56:40,081 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:56:40,185 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:56:40,185 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:56:40,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:56:40,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419992241] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 04:56:40,346 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 04:56:40,347 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2023-11-19 04:56:40,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172867062] [2023-11-19 04:56:40,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:56:40,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 04:56:40,349 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:56:40,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 04:56:40,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2023-11-19 04:56:40,350 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:40,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:56:40,369 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2023-11-19 04:56:40,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:56:40,370 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-19 04:56:40,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:56:40,371 INFO L225 Difference]: With dead ends: 11 [2023-11-19 04:56:40,371 INFO L226 Difference]: Without dead ends: 8 [2023-11-19 04:56:40,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2023-11-19 04:56:40,373 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:56:40,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:56:40,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-19 04:56:40,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-19 04:56:40,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:40,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2023-11-19 04:56:40,383 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2023-11-19 04:56:40,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:56:40,383 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2023-11-19 04:56:40,383 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:40,384 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2023-11-19 04:56:40,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 04:56:40,384 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:56:40,385 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:56:40,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:56:40,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:40,607 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:56:40,607 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:56:40,607 INFO L85 PathProgramCache]: Analyzing trace with hash 2071138276, now seen corresponding path program 1 times [2023-11-19 04:56:40,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:56:40,608 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126170452] [2023-11-19 04:56:40,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:40,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:56:40,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:40,745 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 04:56:40,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:56:40,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126170452] [2023-11-19 04:56:40,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126170452] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:56:40,747 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926928124] [2023-11-19 04:56:40,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:40,747 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:40,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:56:40,749 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:56:40,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:56:40,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:40,797 INFO L262 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 04:56:40,798 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:56:40,838 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:56:40,838 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:56:40,949 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:56:40,949 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926928124] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:56:40,949 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [309530874] [2023-11-19 04:56:41,022 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:56:41,031 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:56:41,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:56:41,042 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:56:41,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:56:41,353 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:56:41,424 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '154#(and (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~y~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2023-11-19 04:56:41,425 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:56:41,425 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:56:41,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 4, 4] total 9 [2023-11-19 04:56:41,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085433404] [2023-11-19 04:56:41,426 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:56:41,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-19 04:56:41,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:56:41,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-19 04:56:41,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:56:41,430 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:41,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:56:41,481 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2023-11-19 04:56:41,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 04:56:41,482 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 04:56:41,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:56:41,482 INFO L225 Difference]: With dead ends: 17 [2023-11-19 04:56:41,482 INFO L226 Difference]: Without dead ends: 12 [2023-11-19 04:56:41,483 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2023-11-19 04:56:41,484 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:56:41,485 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:56:41,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-19 04:56:41,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-11-19 04:56:41,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:41,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2023-11-19 04:56:41,489 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 7 [2023-11-19 04:56:41,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:56:41,490 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2023-11-19 04:56:41,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.7) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:41,490 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2023-11-19 04:56:41,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 04:56:41,491 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:56:41,491 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2023-11-19 04:56:41,520 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-19 04:56:41,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:41,708 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:56:41,709 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:56:41,709 INFO L85 PathProgramCache]: Analyzing trace with hash 1333266159, now seen corresponding path program 2 times [2023-11-19 04:56:41,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:56:41,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220439106] [2023-11-19 04:56:41,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:41,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:56:41,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:41,908 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:41,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:56:41,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220439106] [2023-11-19 04:56:41,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220439106] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:56:41,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330369139] [2023-11-19 04:56:41,909 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:56:41,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:41,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:56:41,912 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:56:41,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:56:41,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 04:56:41,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:56:41,965 INFO L262 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 04:56:41,967 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:56:41,985 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:41,985 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:56:42,104 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:42,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330369139] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:56:42,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1908330891] [2023-11-19 04:56:42,108 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:56:42,108 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:56:42,108 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:56:42,108 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:56:42,109 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:56:42,244 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:56:42,317 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '278#(and (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~y~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2023-11-19 04:56:42,317 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:56:42,317 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:56:42,317 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-11-19 04:56:42,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450665973] [2023-11-19 04:56:42,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:56:42,320 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 04:56:42,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:56:42,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 04:56:42,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2023-11-19 04:56:42,322 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:42,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:56:42,353 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2023-11-19 04:56:42,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 04:56:42,355 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-19 04:56:42,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:56:42,356 INFO L225 Difference]: With dead ends: 24 [2023-11-19 04:56:42,356 INFO L226 Difference]: Without dead ends: 16 [2023-11-19 04:56:42,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2023-11-19 04:56:42,359 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:56:42,361 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:56:42,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-19 04:56:42,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-11-19 04:56:42,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:42,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2023-11-19 04:56:42,371 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2023-11-19 04:56:42,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:56:42,371 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2023-11-19 04:56:42,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:42,372 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2023-11-19 04:56:42,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-19 04:56:42,373 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:56:42,373 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1] [2023-11-19 04:56:42,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:56:42,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:42,584 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:56:42,584 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:56:42,584 INFO L85 PathProgramCache]: Analyzing trace with hash -506510033, now seen corresponding path program 3 times [2023-11-19 04:56:42,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:56:42,585 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931940699] [2023-11-19 04:56:42,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:42,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:56:42,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:42,932 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:42,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:56:42,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931940699] [2023-11-19 04:56:42,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931940699] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:56:42,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825973911] [2023-11-19 04:56:42,933 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:56:42,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:42,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:56:42,935 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:56:42,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:56:43,008 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:56:43,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:56:43,011 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 04:56:43,015 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:56:43,055 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:43,055 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:56:43,330 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:43,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825973911] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:56:43,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [626285996] [2023-11-19 04:56:43,333 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:56:43,333 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:56:43,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:56:43,333 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:56:43,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:56:43,452 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:56:43,517 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '452#(and (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~y~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2023-11-19 04:56:43,518 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:56:43,518 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:56:43,518 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 16 [2023-11-19 04:56:43,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432441879] [2023-11-19 04:56:43,518 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:56:43,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 04:56:43,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:56:43,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 04:56:43,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=272, Unknown=0, NotChecked=0, Total=420 [2023-11-19 04:56:43,521 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:43,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:56:43,556 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2023-11-19 04:56:43,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-19 04:56:43,557 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-19 04:56:43,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:56:43,558 INFO L225 Difference]: With dead ends: 32 [2023-11-19 04:56:43,558 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 04:56:43,559 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=148, Invalid=272, Unknown=0, NotChecked=0, Total=420 [2023-11-19 04:56:43,559 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:56:43,560 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:56:43,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 04:56:43,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-19 04:56:43,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:43,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2023-11-19 04:56:43,566 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 15 [2023-11-19 04:56:43,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:56:43,566 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2023-11-19 04:56:43,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:43,567 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2023-11-19 04:56:43,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 04:56:43,567 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:56:43,568 INFO L195 NwaCegarLoop]: trace histogram [14, 4, 1, 1, 1, 1, 1] [2023-11-19 04:56:43,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:56:43,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:43,788 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:56:43,789 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:56:43,789 INFO L85 PathProgramCache]: Analyzing trace with hash -852336209, now seen corresponding path program 4 times [2023-11-19 04:56:43,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:56:43,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741839789] [2023-11-19 04:56:43,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:43,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:56:43,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:44,481 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:44,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:56:44,481 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741839789] [2023-11-19 04:56:44,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741839789] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:56:44,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822376963] [2023-11-19 04:56:44,482 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:56:44,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:44,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:56:44,483 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:56:44,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:56:44,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:44,551 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-19 04:56:44,555 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:56:44,608 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:44,608 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:56:45,326 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:45,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822376963] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:56:45,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074656663] [2023-11-19 04:56:45,328 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:56:45,328 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:56:45,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:56:45,329 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:56:45,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:56:45,449 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:56:45,538 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '722#(and (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~y~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2023-11-19 04:56:45,539 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:56:45,539 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:56:45,539 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 32 [2023-11-19 04:56:45,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847265713] [2023-11-19 04:56:45,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:56:45,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-11-19 04:56:45,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:56:45,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-11-19 04:56:45,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=792, Unknown=0, NotChecked=0, Total=1332 [2023-11-19 04:56:45,543 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:45,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:56:45,610 INFO L93 Difference]: Finished difference Result 48 states and 65 transitions. [2023-11-19 04:56:45,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-11-19 04:56:45,610 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-19 04:56:45,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:56:45,612 INFO L225 Difference]: With dead ends: 48 [2023-11-19 04:56:45,612 INFO L226 Difference]: Without dead ends: 40 [2023-11-19 04:56:45,613 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=540, Invalid=792, Unknown=0, NotChecked=0, Total=1332 [2023-11-19 04:56:45,614 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:56:45,614 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:56:45,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-11-19 04:56:45,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2023-11-19 04:56:45,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:45,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2023-11-19 04:56:45,624 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 23 [2023-11-19 04:56:45,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:56:45,624 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2023-11-19 04:56:45,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:45,625 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2023-11-19 04:56:45,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-19 04:56:45,626 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:56:45,626 INFO L195 NwaCegarLoop]: trace histogram [30, 4, 1, 1, 1, 1, 1] [2023-11-19 04:56:45,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:56:45,842 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:45,842 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:56:45,843 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:56:45,843 INFO L85 PathProgramCache]: Analyzing trace with hash -225764689, now seen corresponding path program 5 times [2023-11-19 04:56:45,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:56:45,843 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299010052] [2023-11-19 04:56:45,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:45,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:56:45,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:48,165 INFO L134 CoverageAnalysis]: Checked inductivity of 475 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:48,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:56:48,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299010052] [2023-11-19 04:56:48,166 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299010052] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:56:48,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405452056] [2023-11-19 04:56:48,166 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:56:48,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:48,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:56:48,168 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:56:48,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 04:56:48,283 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2023-11-19 04:56:48,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:56:48,285 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-19 04:56:48,293 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:56:48,402 INFO L134 CoverageAnalysis]: Checked inductivity of 475 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:48,403 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:56:50,599 INFO L134 CoverageAnalysis]: Checked inductivity of 475 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:50,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405452056] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:56:50,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1426848358] [2023-11-19 04:56:50,605 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:56:50,606 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:56:50,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:56:50,606 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:56:50,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:56:50,693 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:56:50,815 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1184#(and (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~y~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2023-11-19 04:56:50,816 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:56:50,816 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:56:50,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2023-11-19 04:56:50,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282183299] [2023-11-19 04:56:50,816 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:56:50,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2023-11-19 04:56:50,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:56:50,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2023-11-19 04:56:50,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2092, Invalid=2600, Unknown=0, NotChecked=0, Total=4692 [2023-11-19 04:56:50,825 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:50,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:56:50,950 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2023-11-19 04:56:50,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2023-11-19 04:56:50,953 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2023-11-19 04:56:50,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:56:50,954 INFO L225 Difference]: With dead ends: 80 [2023-11-19 04:56:50,954 INFO L226 Difference]: Without dead ends: 72 [2023-11-19 04:56:50,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2092, Invalid=2600, Unknown=0, NotChecked=0, Total=4692 [2023-11-19 04:56:50,957 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:56:50,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:56:50,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-11-19 04:56:50,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2023-11-19 04:56:50,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:50,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2023-11-19 04:56:50,973 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 39 [2023-11-19 04:56:50,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:56:50,973 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2023-11-19 04:56:50,974 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:56:50,974 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2023-11-19 04:56:50,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-11-19 04:56:50,978 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:56:50,978 INFO L195 NwaCegarLoop]: trace histogram [62, 4, 1, 1, 1, 1, 1] [2023-11-19 04:56:51,003 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-19 04:56:51,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:51,193 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:56:51,193 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:56:51,194 INFO L85 PathProgramCache]: Analyzing trace with hash -712602449, now seen corresponding path program 6 times [2023-11-19 04:56:51,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:56:51,194 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587422708] [2023-11-19 04:56:51,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:56:51,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:56:51,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:56:57,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1963 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:57,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:56:57,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587422708] [2023-11-19 04:56:57,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587422708] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:56:57,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375623394] [2023-11-19 04:56:57,683 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:56:57,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:56:57,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:56:57,688 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:56:57,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 04:56:57,802 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:56:57,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:56:57,806 INFO L262 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 64 conjunts are in the unsatisfiable core [2023-11-19 04:56:57,817 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:56:58,001 INFO L134 CoverageAnalysis]: Checked inductivity of 1963 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:56:58,001 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:04,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1963 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:57:04,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1375623394] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:04,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1426030211] [2023-11-19 04:57:04,426 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2023-11-19 04:57:04,426 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:04,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:04,427 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:04,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:57:04,518 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:57:04,710 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2030#(and (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~z~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~y~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 0 |ULTIMATE.start_main_~z~0#1|))' at error location [2023-11-19 04:57:04,710 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:57:04,710 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:57:04,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 128 [2023-11-19 04:57:04,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461183163] [2023-11-19 04:57:04,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:57:04,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2023-11-19 04:57:04,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:04,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2023-11-19 04:57:04,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8268, Invalid=9288, Unknown=0, NotChecked=0, Total=17556 [2023-11-19 04:57:04,727 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 129 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 128 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:05,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:05,039 INFO L93 Difference]: Finished difference Result 144 states and 209 transitions. [2023-11-19 04:57:05,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2023-11-19 04:57:05,040 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 128 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2023-11-19 04:57:05,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:05,042 INFO L225 Difference]: With dead ends: 144 [2023-11-19 04:57:05,042 INFO L226 Difference]: Without dead ends: 136 [2023-11-19 04:57:05,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=8268, Invalid=9288, Unknown=0, NotChecked=0, Total=17556 [2023-11-19 04:57:05,049 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:05,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:57:05,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2023-11-19 04:57:05,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2023-11-19 04:57:05,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:05,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2023-11-19 04:57:05,069 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 71 [2023-11-19 04:57:05,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:05,070 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2023-11-19 04:57:05,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.0387596899224807) internal successors, (134), 128 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:05,070 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2023-11-19 04:57:05,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-11-19 04:57:05,073 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:05,073 INFO L195 NwaCegarLoop]: trace histogram [126, 4, 1, 1, 1, 1, 1] [2023-11-19 04:57:05,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:05,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:05,296 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:05,296 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:05,296 INFO L85 PathProgramCache]: Analyzing trace with hash -324702033, now seen corresponding path program 7 times [2023-11-19 04:57:05,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:05,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818324180] [2023-11-19 04:57:05,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:05,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:05,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:24,696 INFO L134 CoverageAnalysis]: Checked inductivity of 8011 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:57:24,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:24,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818324180] [2023-11-19 04:57:24,696 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818324180] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:24,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190338623] [2023-11-19 04:57:24,696 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:57:24,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:24,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:24,697 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:24,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6a40cc6-6ac4-43d7-9f71-9fd0f93c6732/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 04:57:24,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:24,884 INFO L262 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 128 conjunts are in the unsatisfiable core [2023-11-19 04:57:24,904 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:25,257 INFO L134 CoverageAnalysis]: Checked inductivity of 8011 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:57:25,258 INFO L327 TraceCheckSpWp]: Computing backward predicates...