./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/termination-crafted-lit/HenzingerJhalaMajumdarSutre-POPL2002-LockingExample.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 30e01a73 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_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-crafted-lit/HenzingerJhalaMajumdarSutre-POPL2002-LockingExample.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash b7e15211580ea4e53f751b22847dfea4720c9dc42574c861d991d991eb47919b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:09:15,886 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:09:16,028 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Overflow-64bit-Taipan_Default.epf [2023-11-23 21:09:16,039 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:09:16,039 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:09:16,078 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:09:16,079 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:09:16,080 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:09:16,081 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:09:16,086 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:09:16,087 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:09:16,088 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:09:16,088 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:09:16,090 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:09:16,091 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:09:16,091 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:09:16,091 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:09:16,092 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:09:16,092 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:09:16,093 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:09:16,093 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:09:16,094 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:09:16,095 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:09:16,095 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:09:16,096 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:09:16,096 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:09:16,097 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:09:16,097 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:09:16,097 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:09:16,098 INFO L153 SettingsManager]: * Check absence of signed integer overflows=true [2023-11-23 21:09:16,099 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:09:16,099 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:09:16,100 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:09:16,100 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:09:16,100 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:09:16,100 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:09:16,101 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:09:16,101 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:09:16,101 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:09:16,101 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:09:16,102 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:09:16,102 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:09:16,102 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:09:16,103 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:09:16,103 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:09:16,103 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:09:16,104 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_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b7e15211580ea4e53f751b22847dfea4720c9dc42574c861d991d991eb47919b [2023-11-23 21:09:16,429 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:09:16,460 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:09:16,463 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:09:16,464 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:09:16,466 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:09:16,467 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/termination-crafted-lit/HenzingerJhalaMajumdarSutre-POPL2002-LockingExample.c [2023-11-23 21:09:19,497 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:09:19,731 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:09:19,731 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/sv-benchmarks/c/termination-crafted-lit/HenzingerJhalaMajumdarSutre-POPL2002-LockingExample.c [2023-11-23 21:09:19,740 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/data/0f662ee7a/b3abe28ec5ac42e490887be85a5482b2/FLAGf2a95d428 [2023-11-23 21:09:19,755 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/data/0f662ee7a/b3abe28ec5ac42e490887be85a5482b2 [2023-11-23 21:09:19,757 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:09:19,758 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:09:19,760 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:09:19,760 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:09:19,766 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:09:19,767 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:09:19" (1/1) ... [2023-11-23 21:09:19,768 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1bd85333 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:19, skipping insertion in model container [2023-11-23 21:09:19,768 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:09:19" (1/1) ... [2023-11-23 21:09:19,789 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:09:20,037 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:09:20,047 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:09:20,064 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:09:20,079 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:09:20,080 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20 WrapperNode [2023-11-23 21:09:20,080 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:09:20,081 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:09:20,081 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:09:20,082 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:09:20,089 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,095 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,115 INFO L138 Inliner]: procedures = 6, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 53 [2023-11-23 21:09:20,116 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:09:20,117 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:09:20,117 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:09:20,117 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:09:20,127 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,127 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,128 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,129 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,140 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,146 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,153 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,154 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,156 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:09:20,158 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:09:20,158 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:09:20,159 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:09:20,160 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (1/1) ... [2023-11-23 21:09:20,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:09:20,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:20,197 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:09:20,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:09:20,241 INFO L130 BoogieDeclarations]: Found specification of procedure unlock [2023-11-23 21:09:20,242 INFO L138 BoogieDeclarations]: Found implementation of procedure unlock [2023-11-23 21:09:20,242 INFO L130 BoogieDeclarations]: Found specification of procedure lock [2023-11-23 21:09:20,242 INFO L138 BoogieDeclarations]: Found implementation of procedure lock [2023-11-23 21:09:20,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:09:20,243 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:09:20,303 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:09:20,305 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:09:20,478 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:09:20,518 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:09:20,518 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-23 21:09:20,520 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:09:20 BoogieIcfgContainer [2023-11-23 21:09:20,520 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:09:20,523 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:09:20,523 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:09:20,527 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:09:20,527 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:09:19" (1/3) ... [2023-11-23 21:09:20,528 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ac9419a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:09:20, skipping insertion in model container [2023-11-23 21:09:20,528 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:20" (2/3) ... [2023-11-23 21:09:20,529 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ac9419a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:09:20, skipping insertion in model container [2023-11-23 21:09:20,529 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:09:20" (3/3) ... [2023-11-23 21:09:20,530 INFO L112 eAbstractionObserver]: Analyzing ICFG HenzingerJhalaMajumdarSutre-POPL2002-LockingExample.c [2023-11-23 21:09:20,552 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:09:20,552 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 4 error locations. [2023-11-23 21:09:20,606 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:09:20,613 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;@2a9f153f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:09:20,614 INFO L358 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2023-11-23 21:09:20,617 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 20 states have (on average 1.55) internal successors, (31), 24 states have internal predecessors, (31), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-23 21:09:20,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 21:09:20,625 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:20,626 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:20,626 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 1 more)] === [2023-11-23 21:09:20,632 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:20,632 INFO L85 PathProgramCache]: Analyzing trace with hash -1589653680, now seen corresponding path program 1 times [2023-11-23 21:09:20,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:20,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823188828] [2023-11-23 21:09:20,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:20,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:20,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:20,942 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:09:20,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:20,943 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823188828] [2023-11-23 21:09:20,944 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823188828] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:20,944 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:09:20,944 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:09:20,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100443627] [2023-11-23 21:09:20,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:20,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:09:20,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:21,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:09:21,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:09:21,004 INFO L87 Difference]: Start difference. First operand has 31 states, 20 states have (on average 1.55) internal successors, (31), 24 states have internal predecessors, (31), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:09:21,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:21,145 INFO L93 Difference]: Finished difference Result 61 states and 81 transitions. [2023-11-23 21:09:21,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:09:21,148 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2023-11-23 21:09:21,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:21,158 INFO L225 Difference]: With dead ends: 61 [2023-11-23 21:09:21,158 INFO L226 Difference]: Without dead ends: 38 [2023-11-23 21:09:21,162 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:09:21,169 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 21 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:21,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 113 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:09:21,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-23 21:09:21,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 27. [2023-11-23 21:09:21,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 21 states have internal predecessors, (26), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 21:09:21,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2023-11-23 21:09:21,235 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 9 [2023-11-23 21:09:21,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:21,236 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2023-11-23 21:09:21,236 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:09:21,236 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2023-11-23 21:09:21,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:09:21,238 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:21,238 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:21,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:09:21,239 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 1 more)] === [2023-11-23 21:09:21,241 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:21,241 INFO L85 PathProgramCache]: Analyzing trace with hash -2034623762, now seen corresponding path program 1 times [2023-11-23 21:09:21,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:21,241 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832939845] [2023-11-23 21:09:21,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:21,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:21,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:21,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:09:21,334 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:21,334 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832939845] [2023-11-23 21:09:21,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832939845] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:21,335 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:09:21,335 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:09:21,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079436021] [2023-11-23 21:09:21,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:21,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:09:21,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:21,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:09:21,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:09:21,339 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:09:21,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:21,375 INFO L93 Difference]: Finished difference Result 42 states and 55 transitions. [2023-11-23 21:09:21,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:09:21,376 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-11-23 21:09:21,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:21,377 INFO L225 Difference]: With dead ends: 42 [2023-11-23 21:09:21,377 INFO L226 Difference]: Without dead ends: 41 [2023-11-23 21:09:21,378 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:09:21,380 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 17 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:21,380 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 101 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:09:21,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-23 21:09:21,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 26. [2023-11-23 21:09:21,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 20 states have internal predecessors, (25), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 21:09:21,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2023-11-23 21:09:21,397 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2023-11-23 21:09:21,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:21,398 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2023-11-23 21:09:21,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:09:21,399 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2023-11-23 21:09:21,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 21:09:21,400 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:21,401 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:21,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:09:21,401 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 1 more)] === [2023-11-23 21:09:21,402 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:21,403 INFO L85 PathProgramCache]: Analyzing trace with hash -555318825, now seen corresponding path program 1 times [2023-11-23 21:09:21,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:21,404 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816160075] [2023-11-23 21:09:21,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:21,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:21,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:21,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:09:21,570 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:21,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816160075] [2023-11-23 21:09:21,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [816160075] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:21,571 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:09:21,571 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:09:21,571 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374088925] [2023-11-23 21:09:21,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:21,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:09:21,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:21,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:09:21,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:09:21,578 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:09:21,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:21,621 INFO L93 Difference]: Finished difference Result 26 states and 33 transitions. [2023-11-23 21:09:21,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:09:21,622 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 12 [2023-11-23 21:09:21,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:21,623 INFO L225 Difference]: With dead ends: 26 [2023-11-23 21:09:21,623 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:09:21,624 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:09:21,625 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 19 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:21,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 50 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:09:21,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:09:21,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-11-23 21:09:21,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 21:09:21,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2023-11-23 21:09:21,636 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 12 [2023-11-23 21:09:21,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:21,636 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2023-11-23 21:09:21,637 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:09:21,637 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2023-11-23 21:09:21,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 21:09:21,638 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:21,638 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:21,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:09:21,639 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 1 more)] === [2023-11-23 21:09:21,639 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:21,640 INFO L85 PathProgramCache]: Analyzing trace with hash -35014294, now seen corresponding path program 1 times [2023-11-23 21:09:21,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:21,642 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480752140] [2023-11-23 21:09:21,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:21,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:21,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:21,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:09:21,713 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:21,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480752140] [2023-11-23 21:09:21,714 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480752140] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:21,714 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:09:21,714 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:09:21,714 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132284292] [2023-11-23 21:09:21,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:21,715 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:09:21,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:21,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:09:21,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:09:21,716 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:09:21,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:21,782 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2023-11-23 21:09:21,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:09:21,783 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2023-11-23 21:09:21,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:21,784 INFO L225 Difference]: With dead ends: 34 [2023-11-23 21:09:21,784 INFO L226 Difference]: Without dead ends: 33 [2023-11-23 21:09:21,784 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:09:21,786 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 16 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:21,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 57 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:09:21,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-23 21:09:21,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-11-23 21:09:21,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 25 states have internal predecessors, (31), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:09:21,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2023-11-23 21:09:21,805 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 13 [2023-11-23 21:09:21,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:21,806 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2023-11-23 21:09:21,806 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:09:21,806 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2023-11-23 21:09:21,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:09:21,807 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:21,808 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-23 21:09:21,808 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:09:21,808 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 1 more)] === [2023-11-23 21:09:21,809 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:21,809 INFO L85 PathProgramCache]: Analyzing trace with hash 194030849, now seen corresponding path program 1 times [2023-11-23 21:09:21,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:21,809 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140651221] [2023-11-23 21:09:21,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:21,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:21,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:21,933 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:09:21,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:21,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140651221] [2023-11-23 21:09:21,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1140651221] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:21,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870422000] [2023-11-23 21:09:21,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:21,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:21,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:21,937 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:21,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:09:22,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:22,009 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:09:22,015 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:22,126 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:09:22,126 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:22,247 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:09:22,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870422000] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:09:22,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [405902104] [2023-11-23 21:09:22,268 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:09:22,269 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:22,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:22,278 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:22,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:23,765 INFO L197 IcfgInterpreter]: Interpreting procedure lock with input of size 22 for LOIs [2023-11-23 21:09:23,776 INFO L197 IcfgInterpreter]: Interpreting procedure unlock with input of size 15 for LOIs [2023-11-23 21:09:23,782 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:09:24,352 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '560#(and (<= 2147483647 |ULTIMATE.start_main_#t~post5#1|) (exists ((|v_ULTIMATE.start_main_#t~nondet4#1_20| Int)) (and (<= |v_ULTIMATE.start_main_#t~nondet4#1_20| 2147483647) (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet4#1_20| 2147483648)) (not (= |v_ULTIMATE.start_main_#t~nondet4#1_20| 0)))) (= |ULTIMATE.start_main_#t~post5#1| |ULTIMATE.start_main_~new~0#1|) (not (= ~LOCK~0 1)))' at error location [2023-11-23 21:09:24,352 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:09:24,352 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:09:24,352 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-23 21:09:24,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286175751] [2023-11-23 21:09:24,353 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:09:24,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 21:09:24,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:24,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 21:09:24,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2023-11-23 21:09:24,366 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 21:09:24,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:24,525 INFO L93 Difference]: Finished difference Result 58 states and 79 transitions. [2023-11-23 21:09:24,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:09:24,526 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 25 [2023-11-23 21:09:24,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:24,527 INFO L225 Difference]: With dead ends: 58 [2023-11-23 21:09:24,527 INFO L226 Difference]: Without dead ends: 57 [2023-11-23 21:09:24,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 54 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2023-11-23 21:09:24,529 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 35 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:24,530 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 91 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:09:24,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-23 21:09:24,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-11-23 21:09:24,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 43 states have internal predecessors, (52), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-23 21:09:24,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 76 transitions. [2023-11-23 21:09:24,541 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 76 transitions. Word has length 25 [2023-11-23 21:09:24,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:24,542 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 76 transitions. [2023-11-23 21:09:24,542 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.111111111111111) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 21:09:24,542 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 76 transitions. [2023-11-23 21:09:24,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-11-23 21:09:24,545 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:24,545 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1] [2023-11-23 21:09:24,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:24,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:24,766 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 1 more)] === [2023-11-23 21:09:24,767 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:24,767 INFO L85 PathProgramCache]: Analyzing trace with hash 1145997510, now seen corresponding path program 2 times [2023-11-23 21:09:24,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:24,767 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391482990] [2023-11-23 21:09:24,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:24,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:24,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:25,143 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-23 21:09:25,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:25,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391482990] [2023-11-23 21:09:25,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [391482990] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:25,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459685366] [2023-11-23 21:09:25,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:09:25,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:25,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:25,152 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:25,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:09:25,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-23 21:09:25,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:09:25,229 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-23 21:09:25,239 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:25,329 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-23 21:09:25,329 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:25,578 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-23 21:09:25,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459685366] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:09:25,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [292891793] [2023-11-23 21:09:25,582 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:09:25,583 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:25,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:25,583 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:25,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:26,321 INFO L197 IcfgInterpreter]: Interpreting procedure lock with input of size 22 for LOIs [2023-11-23 21:09:26,334 INFO L197 IcfgInterpreter]: Interpreting procedure unlock with input of size 15 for LOIs [2023-11-23 21:09:26,338 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:09:26,957 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1107#(and (<= 2147483647 |ULTIMATE.start_main_#t~post5#1|) (= |ULTIMATE.start_main_#t~post5#1| |ULTIMATE.start_main_~new~0#1|) (exists ((|v_ULTIMATE.start_main_#t~nondet4#1_30| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet4#1_30| 2147483648)) (<= |v_ULTIMATE.start_main_#t~nondet4#1_30| 2147483647) (not (= |v_ULTIMATE.start_main_#t~nondet4#1_30| 0)))) (not (= ~LOCK~0 1)))' at error location [2023-11-23 21:09:26,957 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:09:26,957 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:09:26,957 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2023-11-23 21:09:26,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610470944] [2023-11-23 21:09:26,958 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:09:26,959 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-23 21:09:26,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:26,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-23 21:09:26,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=948, Unknown=0, NotChecked=0, Total=1122 [2023-11-23 21:09:26,961 INFO L87 Difference]: Start difference. First operand 57 states and 76 transitions. Second operand has 22 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 22 states have internal predecessors, (64), 10 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 10 states have call predecessors, (20), 10 states have call successors, (20) [2023-11-23 21:09:27,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:27,394 INFO L93 Difference]: Finished difference Result 106 states and 148 transitions. [2023-11-23 21:09:27,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-23 21:09:27,395 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 22 states have internal predecessors, (64), 10 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 10 states have call predecessors, (20), 10 states have call successors, (20) Word has length 61 [2023-11-23 21:09:27,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:27,397 INFO L225 Difference]: With dead ends: 106 [2023-11-23 21:09:27,398 INFO L226 Difference]: Without dead ends: 105 [2023-11-23 21:09:27,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 150 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=349, Invalid=1543, Unknown=0, NotChecked=0, Total=1892 [2023-11-23 21:09:27,400 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 74 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:27,400 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 164 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:09:27,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-11-23 21:09:27,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2023-11-23 21:09:27,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 78 states have (on average 1.205128205128205) internal successors, (94), 79 states have internal predecessors, (94), 24 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-23 21:09:27,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 142 transitions. [2023-11-23 21:09:27,415 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 142 transitions. Word has length 61 [2023-11-23 21:09:27,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:27,416 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 142 transitions. [2023-11-23 21:09:27,416 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 22 states have internal predecessors, (64), 10 states have call successors, (20), 1 states have call predecessors, (20), 1 states have return successors, (20), 10 states have call predecessors, (20), 10 states have call successors, (20) [2023-11-23 21:09:27,416 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 142 transitions. [2023-11-23 21:09:27,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2023-11-23 21:09:27,423 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:27,423 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 1, 1, 1] [2023-11-23 21:09:27,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:27,640 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:27,640 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 1 more)] === [2023-11-23 21:09:27,641 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:27,641 INFO L85 PathProgramCache]: Analyzing trace with hash 1931756752, now seen corresponding path program 3 times [2023-11-23 21:09:27,641 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:27,641 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470305500] [2023-11-23 21:09:27,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:27,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:27,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:28,441 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-11-23 21:09:28,441 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:28,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470305500] [2023-11-23 21:09:28,441 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470305500] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:28,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737769703] [2023-11-23 21:09:28,441 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:09:28,442 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:28,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:28,443 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:28,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:09:28,570 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:09:28,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:09:28,574 INFO L262 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-23 21:09:28,580 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:28,707 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-11-23 21:09:28,707 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:29,451 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 430 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-11-23 21:09:29,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737769703] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:09:29,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1751184015] [2023-11-23 21:09:29,453 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:09:29,454 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:29,454 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:29,454 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:29,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:30,081 INFO L197 IcfgInterpreter]: Interpreting procedure lock with input of size 22 for LOIs [2023-11-23 21:09:30,088 INFO L197 IcfgInterpreter]: Interpreting procedure unlock with input of size 15 for LOIs [2023-11-23 21:09:30,091 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:09:30,997 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2242#(and (exists ((|v_ULTIMATE.start_main_#t~nondet4#1_46| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet4#1_46| 2147483648)) (<= |v_ULTIMATE.start_main_#t~nondet4#1_46| 2147483647) (not (= |v_ULTIMATE.start_main_#t~nondet4#1_46| 0)))) (<= 2147483647 |ULTIMATE.start_main_#t~post5#1|) (= |ULTIMATE.start_main_#t~post5#1| |ULTIMATE.start_main_~new~0#1|) (not (= ~LOCK~0 1)))' at error location [2023-11-23 21:09:30,997 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:09:30,997 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:09:30,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2023-11-23 21:09:30,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887135969] [2023-11-23 21:09:30,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:09:30,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-11-23 21:09:30,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:31,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-11-23 21:09:31,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=606, Invalid=2700, Unknown=0, NotChecked=0, Total=3306 [2023-11-23 21:09:31,003 INFO L87 Difference]: Start difference. First operand 105 states and 142 transitions. Second operand has 46 states, 45 states have (on average 3.022222222222222) internal successors, (136), 46 states have internal predecessors, (136), 22 states have call successors, (44), 1 states have call predecessors, (44), 1 states have return successors, (44), 22 states have call predecessors, (44), 22 states have call successors, (44) [2023-11-23 21:09:31,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:31,953 INFO L93 Difference]: Finished difference Result 202 states and 286 transitions. [2023-11-23 21:09:31,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-11-23 21:09:31,954 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 3.022222222222222) internal successors, (136), 46 states have internal predecessors, (136), 22 states have call successors, (44), 1 states have call predecessors, (44), 1 states have return successors, (44), 22 states have call predecessors, (44), 22 states have call successors, (44) Word has length 133 [2023-11-23 21:09:31,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:31,957 INFO L225 Difference]: With dead ends: 202 [2023-11-23 21:09:31,957 INFO L226 Difference]: Without dead ends: 201 [2023-11-23 21:09:31,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 342 SyntacticMatches, 22 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2441 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1387, Invalid=4933, Unknown=0, NotChecked=0, Total=6320 [2023-11-23 21:09:31,965 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 215 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:31,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [217 Valid, 127 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:09:31,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-11-23 21:09:31,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2023-11-23 21:09:31,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 150 states have (on average 1.1866666666666668) internal successors, (178), 151 states have internal predecessors, (178), 48 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (48), 48 states have call predecessors, (48), 48 states have call successors, (48) [2023-11-23 21:09:31,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 274 transitions. [2023-11-23 21:09:31,988 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 274 transitions. Word has length 133 [2023-11-23 21:09:31,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:31,989 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 274 transitions. [2023-11-23 21:09:31,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 3.022222222222222) internal successors, (136), 46 states have internal predecessors, (136), 22 states have call successors, (44), 1 states have call predecessors, (44), 1 states have return successors, (44), 22 states have call predecessors, (44), 22 states have call successors, (44) [2023-11-23 21:09:31,990 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 274 transitions. [2023-11-23 21:09:31,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2023-11-23 21:09:31,995 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:31,996 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 22, 22, 1, 1, 1] [2023-11-23 21:09:32,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:32,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:32,215 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 1 more)] === [2023-11-23 21:09:32,216 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:32,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1702179100, now seen corresponding path program 4 times [2023-11-23 21:09:32,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:32,216 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358741050] [2023-11-23 21:09:32,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:32,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:32,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:34,823 INFO L134 CoverageAnalysis]: Checked inductivity of 3014 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2023-11-23 21:09:34,823 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:34,824 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358741050] [2023-11-23 21:09:34,824 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358741050] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:34,824 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933533105] [2023-11-23 21:09:34,824 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:09:34,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:34,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:34,825 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:34,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:09:34,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:34,978 INFO L262 TraceCheckSpWp]: Trace formula consists of 607 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-23 21:09:34,997 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:35,250 INFO L134 CoverageAnalysis]: Checked inductivity of 3014 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2023-11-23 21:09:35,250 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:37,891 INFO L134 CoverageAnalysis]: Checked inductivity of 3014 backedges. 0 proven. 2002 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2023-11-23 21:09:37,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933533105] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:09:37,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2121336678] [2023-11-23 21:09:37,894 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:09:37,894 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:37,894 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:37,895 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:37,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:38,441 INFO L197 IcfgInterpreter]: Interpreting procedure lock with input of size 22 for LOIs [2023-11-23 21:09:38,447 INFO L197 IcfgInterpreter]: Interpreting procedure unlock with input of size 15 for LOIs [2023-11-23 21:09:38,451 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:09:40,244 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4553#(and (<= 2147483647 |ULTIMATE.start_main_#t~post5#1|) (exists ((|v_ULTIMATE.start_main_#t~nondet4#1_74| Int)) (and (not (= |v_ULTIMATE.start_main_#t~nondet4#1_74| 0)) (<= 0 (+ |v_ULTIMATE.start_main_#t~nondet4#1_74| 2147483648)) (<= |v_ULTIMATE.start_main_#t~nondet4#1_74| 2147483647))) (= |ULTIMATE.start_main_#t~post5#1| |ULTIMATE.start_main_~new~0#1|) (not (= ~LOCK~0 1)))' at error location [2023-11-23 21:09:40,244 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:09:40,244 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:09:40,244 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2023-11-23 21:09:40,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560987620] [2023-11-23 21:09:40,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:09:40,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2023-11-23 21:09:40,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:40,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2023-11-23 21:09:40,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2334, Invalid=8796, Unknown=0, NotChecked=0, Total=11130 [2023-11-23 21:09:40,260 INFO L87 Difference]: Start difference. First operand 201 states and 274 transitions. Second operand has 94 states, 93 states have (on average 3.010752688172043) internal successors, (280), 94 states have internal predecessors, (280), 46 states have call successors, (92), 1 states have call predecessors, (92), 1 states have return successors, (92), 46 states have call predecessors, (92), 46 states have call successors, (92) [2023-11-23 21:09:42,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:42,979 INFO L93 Difference]: Finished difference Result 394 states and 562 transitions. [2023-11-23 21:09:42,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2023-11-23 21:09:42,981 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 93 states have (on average 3.010752688172043) internal successors, (280), 94 states have internal predecessors, (280), 46 states have call successors, (92), 1 states have call predecessors, (92), 1 states have return successors, (92), 46 states have call predecessors, (92), 46 states have call successors, (92) Word has length 277 [2023-11-23 21:09:42,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:42,993 INFO L225 Difference]: With dead ends: 394 [2023-11-23 21:09:43,007 INFO L226 Difference]: Without dead ends: 393 [2023-11-23 21:09:43,021 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 922 GetRequests, 726 SyntacticMatches, 46 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8993 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=5623, Invalid=17329, Unknown=0, NotChecked=0, Total=22952 [2023-11-23 21:09:43,031 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 452 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 454 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:43,039 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [454 Valid, 241 Invalid, 462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:09:43,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2023-11-23 21:09:43,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 393. [2023-11-23 21:09:43,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 393 states, 294 states have (on average 1.1768707482993197) internal successors, (346), 295 states have internal predecessors, (346), 96 states have call successors, (96), 2 states have call predecessors, (96), 2 states have return successors, (96), 96 states have call predecessors, (96), 96 states have call successors, (96) [2023-11-23 21:09:43,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 538 transitions. [2023-11-23 21:09:43,111 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 538 transitions. Word has length 277 [2023-11-23 21:09:43,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:43,114 INFO L495 AbstractCegarLoop]: Abstraction has 393 states and 538 transitions. [2023-11-23 21:09:43,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 93 states have (on average 3.010752688172043) internal successors, (280), 94 states have internal predecessors, (280), 46 states have call successors, (92), 1 states have call predecessors, (92), 1 states have return successors, (92), 46 states have call predecessors, (92), 46 states have call successors, (92) [2023-11-23 21:09:43,116 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 538 transitions. [2023-11-23 21:09:43,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 566 [2023-11-23 21:09:43,139 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:43,140 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 46, 46, 1, 1, 1] [2023-11-23 21:09:43,156 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-23 21:09:43,347 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:43,347 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ULTIMATE.startErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 1 more)] === [2023-11-23 21:09:43,348 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:43,348 INFO L85 PathProgramCache]: Analyzing trace with hash -1109644532, now seen corresponding path program 5 times [2023-11-23 21:09:43,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:43,348 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041100243] [2023-11-23 21:09:43,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:43,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:43,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:51,916 INFO L134 CoverageAnalysis]: Checked inductivity of 12926 backedges. 0 proven. 8602 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2023-11-23 21:09:51,916 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:51,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041100243] [2023-11-23 21:09:51,917 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041100243] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:51,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732972927] [2023-11-23 21:09:51,917 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:09:51,917 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:51,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:51,923 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:51,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b58d708-6307-41bf-ba26-f9d187172af1/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:09:55,672 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2023-11-23 21:09:55,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:09:55,681 INFO L262 TraceCheckSpWp]: Trace formula consists of 1231 conjuncts, 95 conjunts are in the unsatisfiable core [2023-11-23 21:09:55,696 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:56,229 INFO L134 CoverageAnalysis]: Checked inductivity of 12926 backedges. 0 proven. 8602 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2023-11-23 21:09:56,230 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:04,807 INFO L134 CoverageAnalysis]: Checked inductivity of 12926 backedges. 0 proven. 8602 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2023-11-23 21:10:04,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732972927] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:04,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [320654064] [2023-11-23 21:10:04,810 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:10:04,810 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:04,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:04,811 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:04,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:05,351 INFO L197 IcfgInterpreter]: Interpreting procedure lock with input of size 22 for LOIs [2023-11-23 21:10:05,383 INFO L197 IcfgInterpreter]: Interpreting procedure unlock with input of size 15 for LOIs [2023-11-23 21:10:05,388 INFO L180 IcfgInterpreter]: Interpretation finished