./Ultimate.py --spec ../sv-benchmarks/c/properties/no-overflow.prp --file ../sv-benchmarks/c/weaver/popl20-bad-dot-product.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 3289d67d Calling Ultimate with: /root/.sdkman/candidates/java/11.0.12-open/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/weaver/popl20-bad-dot-product.wvr.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 39e90898aa78f5642c5c7d6f9df6b2e15e069a046a9465d5d61576c4b07f46b8 --- Real Ultimate output --- This is Ultimate 0.2.5-tmp.fs.icfgbuilder-eval-3289d67-m [2024-11-17 07:54:27,679 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-17 07:54:27,761 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Overflow-32bit-Automizer_Default.epf [2024-11-17 07:54:27,765 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-17 07:54:27,765 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-17 07:54:27,787 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-17 07:54:27,791 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-17 07:54:27,791 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-17 07:54:27,791 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-11-17 07:54:27,792 INFO L153 SettingsManager]: * Use memory slicer=true [2024-11-17 07:54:27,792 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-17 07:54:27,792 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-17 07:54:27,793 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-17 07:54:27,795 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-17 07:54:27,795 INFO L153 SettingsManager]: * Use SBE=true [2024-11-17 07:54:27,795 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-17 07:54:27,795 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-17 07:54:27,796 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-17 07:54:27,796 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-17 07:54:27,796 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-17 07:54:27,796 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-17 07:54:27,797 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-17 07:54:27,798 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-17 07:54:27,798 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-17 07:54:27,799 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-17 07:54:27,799 INFO L153 SettingsManager]: * Check absence of signed integer overflows=ASSERTandASSUME [2024-11-17 07:54:27,799 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-11-17 07:54:27,799 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-17 07:54:27,801 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-17 07:54:27,801 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-17 07:54:27,801 INFO L151 SettingsManager]: Preferences of IcfgBuilder differ from their defaults: [2024-11-17 07:54:27,801 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-11-17 07:54:27,802 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-17 07:54:27,802 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-17 07:54:27,802 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-17 07:54:27,802 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-17 07:54:27,802 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-17 07:54:27,802 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-17 07:54:27,802 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-11-17 07:54:27,803 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-17 07:54:27,803 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-17 07:54:27,804 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-11-17 07:54:27,804 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-11-17 07:54:27,804 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-17 07:54:27,804 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39e90898aa78f5642c5c7d6f9df6b2e15e069a046a9465d5d61576c4b07f46b8 [2024-11-17 07:54:27,989 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-17 07:54:28,006 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-17 07:54:28,008 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-17 07:54:28,009 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-17 07:54:28,009 INFO L274 PluginConnector]: CDTParser initialized [2024-11-17 07:54:28,010 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/weaver/popl20-bad-dot-product.wvr.c [2024-11-17 07:54:29,307 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-17 07:54:29,507 INFO L384 CDTParser]: Found 1 translation units. [2024-11-17 07:54:29,507 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/weaver/popl20-bad-dot-product.wvr.c [2024-11-17 07:54:29,517 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a06a925c/081def81c83b429f9a568e27fce1fe90/FLAG38352f4a5 [2024-11-17 07:54:29,897 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a06a925c/081def81c83b429f9a568e27fce1fe90 [2024-11-17 07:54:29,898 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-17 07:54:29,899 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-17 07:54:29,900 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-17 07:54:29,900 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-17 07:54:29,904 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-17 07:54:29,904 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.11 07:54:29" (1/1) ... [2024-11-17 07:54:29,905 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3859b60c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:29, skipping insertion in model container [2024-11-17 07:54:29,905 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.11 07:54:29" (1/1) ... [2024-11-17 07:54:29,921 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-17 07:54:30,117 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-17 07:54:30,126 INFO L200 MainTranslator]: Completed pre-run [2024-11-17 07:54:30,165 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-17 07:54:30,180 INFO L204 MainTranslator]: Completed translation [2024-11-17 07:54:30,180 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30 WrapperNode [2024-11-17 07:54:30,180 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-17 07:54:30,181 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-17 07:54:30,181 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-17 07:54:30,182 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-17 07:54:30,187 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,194 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,215 INFO L138 Inliner]: procedures = 25, calls = 41, calls flagged for inlining = 17, calls inlined = 23, statements flattened = 324 [2024-11-17 07:54:30,216 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-17 07:54:30,217 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-17 07:54:30,217 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-17 07:54:30,217 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-17 07:54:30,225 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,226 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,229 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,242 INFO L175 MemorySlicer]: Split 13 memory accesses to 2 slices as follows [2, 11]. 85 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0]. The 2 writes are split as follows [0, 2]. [2024-11-17 07:54:30,243 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,243 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,254 INFO L184 PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,255 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,261 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,262 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,267 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-17 07:54:30,268 INFO L112 PluginConnector]: ------------------------IcfgBuilder---------------------------- [2024-11-17 07:54:30,268 INFO L270 PluginConnector]: Initializing IcfgBuilder... [2024-11-17 07:54:30,268 INFO L274 PluginConnector]: IcfgBuilder initialized [2024-11-17 07:54:30,269 INFO L184 PluginConnector]: Executing the observer IcfgBuilderObserver from plugin IcfgBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (1/1) ... [2024-11-17 07:54:30,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-17 07:54:30,286 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-17 07:54:30,300 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-11-17 07:54:30,302 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-11-17 07:54:30,339 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-17 07:54:30,340 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2024-11-17 07:54:30,341 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2024-11-17 07:54:30,341 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2024-11-17 07:54:30,341 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2024-11-17 07:54:30,342 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2024-11-17 07:54:30,342 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2024-11-17 07:54:30,342 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-11-17 07:54:30,342 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-11-17 07:54:30,343 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-11-17 07:54:30,343 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-11-17 07:54:30,343 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2024-11-17 07:54:30,344 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2024-11-17 07:54:30,344 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2024-11-17 07:54:30,344 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-17 07:54:30,344 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-17 07:54:30,344 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-11-17 07:54:30,344 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-11-17 07:54:30,346 WARN L225 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement. [2024-11-17 07:54:30,448 INFO L256 CfgBuilder]: Building ICFG [2024-11-17 07:54:30,450 INFO L286 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-17 07:54:30,834 INFO L303 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2024-11-17 07:54:30,834 INFO L307 CfgBuilder]: Performing block encoding [2024-11-17 07:54:31,153 INFO L331 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-17 07:54:31,154 INFO L336 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-17 07:54:31,154 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.11 07:54:31 BoogieIcfgContainer [2024-11-17 07:54:31,155 INFO L131 PluginConnector]: ------------------------ END IcfgBuilder---------------------------- [2024-11-17 07:54:31,156 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-17 07:54:31,156 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-17 07:54:31,159 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-17 07:54:31,159 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.11 07:54:29" (1/3) ... [2024-11-17 07:54:31,160 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c57df6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.11 07:54:31, skipping insertion in model container [2024-11-17 07:54:31,160 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.11 07:54:30" (2/3) ... [2024-11-17 07:54:31,161 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c57df6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.11 07:54:31, skipping insertion in model container [2024-11-17 07:54:31,161 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.icfgbuilder CFG 17.11 07:54:31" (3/3) ... [2024-11-17 07:54:31,162 INFO L112 eAbstractionObserver]: Analyzing ICFG popl20-bad-dot-product.wvr.c [2024-11-17 07:54:31,205 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-17 07:54:31,209 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 34 error locations. [2024-11-17 07:54:31,209 INFO L489 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2024-11-17 07:54:31,360 INFO L143 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2024-11-17 07:54:31,395 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 107 places, 113 transitions, 247 flow [2024-11-17 07:54:31,441 INFO L124 PetriNetUnfolderBase]: 16/110 cut-off events. [2024-11-17 07:54:31,442 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2024-11-17 07:54:31,449 INFO L83 FinitePrefix]: Finished finitePrefix Result has 123 conditions, 110 events. 16/110 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 416 event pairs, 0 based on Foata normal form. 0/60 useless extension candidates. Maximal degree in co-relation 90. Up to 2 conditions per place. [2024-11-17 07:54:31,449 INFO L82 GeneralOperation]: Start removeDead. Operand has 107 places, 113 transitions, 247 flow [2024-11-17 07:54:31,453 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 102 places, 108 transitions, 231 flow [2024-11-17 07:54:31,463 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-17 07:54:31,469 INFO L333 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, mAutomataTypeConcurrency=PETRI_NET, 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;@63156437, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-17 07:54:31,470 INFO L334 AbstractCegarLoop]: Starting to check reachability of 67 error locations. [2024-11-17 07:54:31,474 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-11-17 07:54:31,475 INFO L124 PetriNetUnfolderBase]: 2/8 cut-off events. [2024-11-17 07:54:31,475 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-11-17 07:54:31,475 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-17 07:54:31,475 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2024-11-17 07:54:31,476 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [thread1Err1ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err9ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW (and 64 more)] === [2024-11-17 07:54:31,480 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-17 07:54:31,481 INFO L85 PathProgramCache]: Analyzing trace with hash 29926898, now seen corresponding path program 1 times [2024-11-17 07:54:31,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-17 07:54:31,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019396274] [2024-11-17 07:54:31,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:31,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-17 07:54:31,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:31,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:31,724 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-17 07:54:31,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019396274] [2024-11-17 07:54:31,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019396274] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-17 07:54:31,725 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-17 07:54:31,726 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-17 07:54:31,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833226744] [2024-11-17 07:54:31,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-17 07:54:31,734 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-17 07:54:31,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-17 07:54:31,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-17 07:54:31,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-17 07:54:31,789 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 113 [2024-11-17 07:54:31,792 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 102 places, 108 transitions, 231 flow. Second operand has 4 states, 4 states have (on average 36.75) internal successors, (147), 4 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:31,792 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-17 07:54:31,795 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 113 [2024-11-17 07:54:31,796 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-17 07:54:33,929 INFO L124 PetriNetUnfolderBase]: 13136/21872 cut-off events. [2024-11-17 07:54:33,930 INFO L125 PetriNetUnfolderBase]: For 686/686 co-relation queries the response was YES. [2024-11-17 07:54:33,973 INFO L83 FinitePrefix]: Finished finitePrefix Result has 40508 conditions, 21872 events. 13136/21872 cut-off events. For 686/686 co-relation queries the response was YES. Maximal size of possible extension queue 1287. Compared 174669 event pairs, 10944 based on Foata normal form. 1099/16099 useless extension candidates. Maximal degree in co-relation 39082. Up to 18076 conditions per place. [2024-11-17 07:54:34,082 INFO L140 encePairwiseOnDemand]: 91/113 looper letters, 53 selfloop transitions, 6 changer transitions 0/92 dead transitions. [2024-11-17 07:54:34,082 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 97 places, 92 transitions, 317 flow [2024-11-17 07:54:34,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-17 07:54:34,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2024-11-17 07:54:34,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 219 transitions. [2024-11-17 07:54:34,093 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.48451327433628316 [2024-11-17 07:54:34,094 INFO L175 Difference]: Start difference. First operand has 102 places, 108 transitions, 231 flow. Second operand 4 states and 219 transitions. [2024-11-17 07:54:34,095 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 97 places, 92 transitions, 317 flow [2024-11-17 07:54:34,100 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 92 places, 92 transitions, 308 flow, removed 0 selfloop flow, removed 5 redundant places. [2024-11-17 07:54:34,102 INFO L231 Difference]: Finished difference. Result has 92 places, 92 transitions, 202 flow [2024-11-17 07:54:34,103 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=113, PETRI_DIFFERENCE_MINUEND_FLOW=190, PETRI_DIFFERENCE_MINUEND_PLACES=89, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=92, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=6, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=86, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=202, PETRI_PLACES=92, PETRI_TRANSITIONS=92} [2024-11-17 07:54:34,106 INFO L277 CegarLoopForPetriNet]: 102 programPoint places, -10 predicate places. [2024-11-17 07:54:34,106 INFO L471 AbstractCegarLoop]: Abstraction has has 92 places, 92 transitions, 202 flow [2024-11-17 07:54:34,107 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 36.75) internal successors, (147), 4 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:34,107 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-17 07:54:34,107 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2024-11-17 07:54:34,107 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-17 07:54:34,107 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [thread1Err1ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err9ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW (and 64 more)] === [2024-11-17 07:54:34,108 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-17 07:54:34,108 INFO L85 PathProgramCache]: Analyzing trace with hash 927734685, now seen corresponding path program 1 times [2024-11-17 07:54:34,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-17 07:54:34,108 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860738142] [2024-11-17 07:54:34,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:34,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-17 07:54:34,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:34,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:34,172 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-17 07:54:34,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860738142] [2024-11-17 07:54:34,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860738142] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-17 07:54:34,172 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-17 07:54:34,172 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-17 07:54:34,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450632656] [2024-11-17 07:54:34,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-17 07:54:34,174 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-17 07:54:34,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-17 07:54:34,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-17 07:54:34,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-17 07:54:34,195 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 113 [2024-11-17 07:54:34,196 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 92 places, 92 transitions, 202 flow. Second operand has 4 states, 4 states have (on average 36.75) internal successors, (147), 4 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:34,197 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-17 07:54:34,197 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 113 [2024-11-17 07:54:34,197 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-17 07:54:35,947 INFO L124 PetriNetUnfolderBase]: 13138/21884 cut-off events. [2024-11-17 07:54:35,948 INFO L125 PetriNetUnfolderBase]: For 181/181 co-relation queries the response was YES. [2024-11-17 07:54:35,980 INFO L83 FinitePrefix]: Finished finitePrefix Result has 40339 conditions, 21884 events. 13138/21884 cut-off events. For 181/181 co-relation queries the response was YES. Maximal size of possible extension queue 1287. Compared 174716 event pairs, 10944 based on Foata normal form. 2/15016 useless extension candidates. Maximal degree in co-relation 40283. Up to 18085 conditions per place. [2024-11-17 07:54:36,057 INFO L140 encePairwiseOnDemand]: 104/113 looper letters, 58 selfloop transitions, 7 changer transitions 0/98 dead transitions. [2024-11-17 07:54:36,057 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 95 places, 98 transitions, 354 flow [2024-11-17 07:54:36,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-17 07:54:36,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2024-11-17 07:54:36,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 211 transitions. [2024-11-17 07:54:36,059 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.4668141592920354 [2024-11-17 07:54:36,059 INFO L175 Difference]: Start difference. First operand has 92 places, 92 transitions, 202 flow. Second operand 4 states and 211 transitions. [2024-11-17 07:54:36,059 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 95 places, 98 transitions, 354 flow [2024-11-17 07:54:36,060 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 92 places, 98 transitions, 332 flow, removed 0 selfloop flow, removed 3 redundant places. [2024-11-17 07:54:36,063 INFO L231 Difference]: Finished difference. Result has 95 places, 98 transitions, 246 flow [2024-11-17 07:54:36,063 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=113, PETRI_DIFFERENCE_MINUEND_FLOW=190, PETRI_DIFFERENCE_MINUEND_PLACES=89, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=92, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=85, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=246, PETRI_PLACES=95, PETRI_TRANSITIONS=98} [2024-11-17 07:54:36,064 INFO L277 CegarLoopForPetriNet]: 102 programPoint places, -7 predicate places. [2024-11-17 07:54:36,064 INFO L471 AbstractCegarLoop]: Abstraction has has 95 places, 98 transitions, 246 flow [2024-11-17 07:54:36,064 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 36.75) internal successors, (147), 4 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:36,064 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-17 07:54:36,065 INFO L204 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1] [2024-11-17 07:54:36,065 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-17 07:54:36,065 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [thread1Err1ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err9ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW (and 64 more)] === [2024-11-17 07:54:36,065 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-17 07:54:36,065 INFO L85 PathProgramCache]: Analyzing trace with hash 941208556, now seen corresponding path program 1 times [2024-11-17 07:54:36,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-17 07:54:36,066 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335499164] [2024-11-17 07:54:36,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:36,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-17 07:54:36,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:36,190 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:36,191 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-17 07:54:36,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335499164] [2024-11-17 07:54:36,191 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335499164] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-17 07:54:36,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [787840841] [2024-11-17 07:54:36,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:36,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-17 07:54:36,192 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-17 07:54:36,194 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-17 07:54:36,196 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-17 07:54:36,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:36,278 INFO L255 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 5 conjuncts are in the unsatisfiable core [2024-11-17 07:54:36,281 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-17 07:54:36,314 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:36,315 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-17 07:54:36,348 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:36,348 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [787840841] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-17 07:54:36,348 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-17 07:54:36,348 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2024-11-17 07:54:36,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75624631] [2024-11-17 07:54:36,349 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-17 07:54:36,349 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-17 07:54:36,349 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-17 07:54:36,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-17 07:54:36,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2024-11-17 07:54:36,384 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 113 [2024-11-17 07:54:36,385 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 95 places, 98 transitions, 246 flow. Second operand has 10 states, 10 states have (on average 37.0) internal successors, (370), 10 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:36,385 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-17 07:54:36,385 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 113 [2024-11-17 07:54:36,385 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-17 07:54:37,980 INFO L124 PetriNetUnfolderBase]: 13144/21920 cut-off events. [2024-11-17 07:54:37,981 INFO L125 PetriNetUnfolderBase]: For 219/219 co-relation queries the response was YES. [2024-11-17 07:54:38,006 INFO L83 FinitePrefix]: Finished finitePrefix Result has 40427 conditions, 21920 events. 13144/21920 cut-off events. For 219/219 co-relation queries the response was YES. Maximal size of possible extension queue 1286. Compared 175189 event pairs, 10944 based on Foata normal form. 0/15048 useless extension candidates. Maximal degree in co-relation 40298. Up to 18088 conditions per place. [2024-11-17 07:54:38,076 INFO L140 encePairwiseOnDemand]: 104/113 looper letters, 58 selfloop transitions, 25 changer transitions 0/116 dead transitions. [2024-11-17 07:54:38,076 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 104 places, 116 transitions, 490 flow [2024-11-17 07:54:38,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-17 07:54:38,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2024-11-17 07:54:38,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 449 transitions. [2024-11-17 07:54:38,078 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.3973451327433628 [2024-11-17 07:54:38,079 INFO L175 Difference]: Start difference. First operand has 95 places, 98 transitions, 246 flow. Second operand 10 states and 449 transitions. [2024-11-17 07:54:38,079 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 104 places, 116 transitions, 490 flow [2024-11-17 07:54:38,080 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 104 places, 116 transitions, 490 flow, removed 0 selfloop flow, removed 0 redundant places. [2024-11-17 07:54:38,081 INFO L231 Difference]: Finished difference. Result has 107 places, 116 transitions, 408 flow [2024-11-17 07:54:38,082 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=113, PETRI_DIFFERENCE_MINUEND_FLOW=246, PETRI_DIFFERENCE_MINUEND_PLACES=95, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=98, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=12, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=86, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=408, PETRI_PLACES=107, PETRI_TRANSITIONS=116} [2024-11-17 07:54:38,082 INFO L277 CegarLoopForPetriNet]: 102 programPoint places, 5 predicate places. [2024-11-17 07:54:38,082 INFO L471 AbstractCegarLoop]: Abstraction has has 107 places, 116 transitions, 408 flow [2024-11-17 07:54:38,083 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 37.0) internal successors, (370), 10 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:38,083 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-17 07:54:38,083 INFO L204 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-17 07:54:38,096 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-17 07:54:38,284 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-17 07:54:38,284 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW === [thread1Err1ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err9ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW (and 64 more)] === [2024-11-17 07:54:38,286 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-17 07:54:38,286 INFO L85 PathProgramCache]: Analyzing trace with hash 2142523535, now seen corresponding path program 1 times [2024-11-17 07:54:38,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-17 07:54:38,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419328707] [2024-11-17 07:54:38,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:38,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-17 07:54:38,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:38,417 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:38,418 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-17 07:54:38,418 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419328707] [2024-11-17 07:54:38,418 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419328707] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-17 07:54:38,418 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-17 07:54:38,418 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-17 07:54:38,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436137093] [2024-11-17 07:54:38,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-17 07:54:38,418 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-17 07:54:38,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-17 07:54:38,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-17 07:54:38,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-17 07:54:38,433 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 38 out of 113 [2024-11-17 07:54:38,433 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 107 places, 116 transitions, 408 flow. Second operand has 4 states, 4 states have (on average 40.75) internal successors, (163), 4 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:38,433 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-17 07:54:38,433 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 38 of 113 [2024-11-17 07:54:38,433 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-17 07:54:40,324 INFO L124 PetriNetUnfolderBase]: 13144/21946 cut-off events. [2024-11-17 07:54:40,324 INFO L125 PetriNetUnfolderBase]: For 350/350 co-relation queries the response was YES. [2024-11-17 07:54:40,352 INFO L83 FinitePrefix]: Finished finitePrefix Result has 40551 conditions, 21946 events. 13144/21946 cut-off events. For 350/350 co-relation queries the response was YES. Maximal size of possible extension queue 1286. Compared 175385 event pairs, 10944 based on Foata normal form. 5/15081 useless extension candidates. Maximal degree in co-relation 40452. Up to 18112 conditions per place. [2024-11-17 07:54:40,401 INFO L140 encePairwiseOnDemand]: 108/113 looper letters, 90 selfloop transitions, 4 changer transitions 1/128 dead transitions. [2024-11-17 07:54:40,402 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 111 places, 128 transitions, 672 flow [2024-11-17 07:54:40,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-17 07:54:40,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2024-11-17 07:54:40,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 257 transitions. [2024-11-17 07:54:40,403 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.45486725663716815 [2024-11-17 07:54:40,403 INFO L175 Difference]: Start difference. First operand has 107 places, 116 transitions, 408 flow. Second operand 5 states and 257 transitions. [2024-11-17 07:54:40,403 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 111 places, 128 transitions, 672 flow [2024-11-17 07:54:40,405 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 107 places, 128 transitions, 589 flow, removed 25 selfloop flow, removed 4 redundant places. [2024-11-17 07:54:40,407 INFO L231 Difference]: Finished difference. Result has 109 places, 117 transitions, 370 flow [2024-11-17 07:54:40,407 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=113, PETRI_DIFFERENCE_MINUEND_FLOW=344, PETRI_DIFFERENCE_MINUEND_PLACES=103, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=116, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=112, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=370, PETRI_PLACES=109, PETRI_TRANSITIONS=117} [2024-11-17 07:54:40,408 INFO L277 CegarLoopForPetriNet]: 102 programPoint places, 7 predicate places. [2024-11-17 07:54:40,408 INFO L471 AbstractCegarLoop]: Abstraction has has 109 places, 117 transitions, 370 flow [2024-11-17 07:54:40,408 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 40.75) internal successors, (163), 4 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:40,408 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-17 07:54:40,408 INFO L204 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-17 07:54:40,408 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2024-11-17 07:54:40,409 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW === [thread1Err1ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err9ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW (and 64 more)] === [2024-11-17 07:54:40,409 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-17 07:54:40,409 INFO L85 PathProgramCache]: Analyzing trace with hash 324772128, now seen corresponding path program 1 times [2024-11-17 07:54:40,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-17 07:54:40,409 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461429074] [2024-11-17 07:54:40,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:40,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-17 07:54:40,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:40,508 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-17 07:54:40,508 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-17 07:54:40,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461429074] [2024-11-17 07:54:40,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461429074] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-17 07:54:40,509 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-17 07:54:40,509 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2024-11-17 07:54:40,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292324537] [2024-11-17 07:54:40,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-17 07:54:40,509 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-17 07:54:40,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-17 07:54:40,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-17 07:54:40,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2024-11-17 07:54:40,524 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 38 out of 113 [2024-11-17 07:54:40,524 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 109 places, 117 transitions, 370 flow. Second operand has 6 states, 6 states have (on average 40.166666666666664) internal successors, (241), 6 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:40,524 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-17 07:54:40,525 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 38 of 113 [2024-11-17 07:54:40,525 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-17 07:54:43,119 INFO L124 PetriNetUnfolderBase]: 20193/32916 cut-off events. [2024-11-17 07:54:43,119 INFO L125 PetriNetUnfolderBase]: For 442/442 co-relation queries the response was YES. [2024-11-17 07:54:43,217 INFO L83 FinitePrefix]: Finished finitePrefix Result has 61480 conditions, 32916 events. 20193/32916 cut-off events. For 442/442 co-relation queries the response was YES. Maximal size of possible extension queue 1582. Compared 266670 event pairs, 14283 based on Foata normal form. 0/23821 useless extension candidates. Maximal degree in co-relation 61389. Up to 18121 conditions per place. [2024-11-17 07:54:43,319 INFO L140 encePairwiseOnDemand]: 104/113 looper letters, 182 selfloop transitions, 12 changer transitions 0/227 dead transitions. [2024-11-17 07:54:43,319 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 115 places, 227 transitions, 990 flow [2024-11-17 07:54:43,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-17 07:54:43,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2024-11-17 07:54:43,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 439 transitions. [2024-11-17 07:54:43,321 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.5549936788874842 [2024-11-17 07:54:43,321 INFO L175 Difference]: Start difference. First operand has 109 places, 117 transitions, 370 flow. Second operand 7 states and 439 transitions. [2024-11-17 07:54:43,321 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 115 places, 227 transitions, 990 flow [2024-11-17 07:54:43,324 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 114 places, 227 transitions, 986 flow, removed 1 selfloop flow, removed 1 redundant places. [2024-11-17 07:54:43,329 INFO L231 Difference]: Finished difference. Result has 118 places, 122 transitions, 428 flow [2024-11-17 07:54:43,329 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=113, PETRI_DIFFERENCE_MINUEND_FLOW=366, PETRI_DIFFERENCE_MINUEND_PLACES=108, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=117, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=105, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=428, PETRI_PLACES=118, PETRI_TRANSITIONS=122} [2024-11-17 07:54:43,330 INFO L277 CegarLoopForPetriNet]: 102 programPoint places, 16 predicate places. [2024-11-17 07:54:43,330 INFO L471 AbstractCegarLoop]: Abstraction has has 118 places, 122 transitions, 428 flow [2024-11-17 07:54:43,330 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 40.166666666666664) internal successors, (241), 6 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:43,330 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-17 07:54:43,330 INFO L204 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-17 07:54:43,330 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2024-11-17 07:54:43,330 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting thread1Err1ASSERT_VIOLATIONINTEGER_OVERFLOW === [thread1Err1ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err9ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW (and 64 more)] === [2024-11-17 07:54:43,331 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-17 07:54:43,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1478001193, now seen corresponding path program 1 times [2024-11-17 07:54:43,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-17 07:54:43,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577282818] [2024-11-17 07:54:43,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:43,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-17 07:54:43,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:43,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-17 07:54:43,373 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-17 07:54:43,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577282818] [2024-11-17 07:54:43,373 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577282818] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-17 07:54:43,373 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-17 07:54:43,374 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-17 07:54:43,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977894243] [2024-11-17 07:54:43,374 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-17 07:54:43,374 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-17 07:54:43,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-17 07:54:43,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-17 07:54:43,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-17 07:54:43,382 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 38 out of 113 [2024-11-17 07:54:43,382 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 118 places, 122 transitions, 428 flow. Second operand has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:43,382 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-17 07:54:43,382 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 38 of 113 [2024-11-17 07:54:43,382 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-17 07:54:48,921 INFO L124 PetriNetUnfolderBase]: 40351/64647 cut-off events. [2024-11-17 07:54:48,922 INFO L125 PetriNetUnfolderBase]: For 8924/8924 co-relation queries the response was YES. [2024-11-17 07:54:49,182 INFO L83 FinitePrefix]: Finished finitePrefix Result has 130754 conditions, 64647 events. 40351/64647 cut-off events. For 8924/8924 co-relation queries the response was YES. Maximal size of possible extension queue 2227. Compared 537435 event pairs, 24030 based on Foata normal form. 732/47149 useless extension candidates. Maximal degree in co-relation 130659. Up to 33918 conditions per place. [2024-11-17 07:54:49,381 INFO L140 encePairwiseOnDemand]: 107/113 looper letters, 165 selfloop transitions, 5 changer transitions 0/205 dead transitions. [2024-11-17 07:54:49,381 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 121 places, 205 transitions, 966 flow [2024-11-17 07:54:49,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-17 07:54:49,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2024-11-17 07:54:49,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 292 transitions. [2024-11-17 07:54:49,383 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.6460176991150443 [2024-11-17 07:54:49,383 INFO L175 Difference]: Start difference. First operand has 118 places, 122 transitions, 428 flow. Second operand 4 states and 292 transitions. [2024-11-17 07:54:49,383 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 121 places, 205 transitions, 966 flow [2024-11-17 07:54:49,401 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 119 places, 205 transitions, 952 flow, removed 0 selfloop flow, removed 2 redundant places. [2024-11-17 07:54:49,402 INFO L231 Difference]: Finished difference. Result has 121 places, 126 transitions, 457 flow [2024-11-17 07:54:49,403 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=113, PETRI_DIFFERENCE_MINUEND_FLOW=414, PETRI_DIFFERENCE_MINUEND_PLACES=116, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=122, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=117, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=457, PETRI_PLACES=121, PETRI_TRANSITIONS=126} [2024-11-17 07:54:49,403 INFO L277 CegarLoopForPetriNet]: 102 programPoint places, 19 predicate places. [2024-11-17 07:54:49,403 INFO L471 AbstractCegarLoop]: Abstraction has has 121 places, 126 transitions, 457 flow [2024-11-17 07:54:49,403 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:49,404 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-17 07:54:49,404 INFO L204 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-17 07:54:49,404 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2024-11-17 07:54:49,404 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting thread2Err7ASSERT_VIOLATIONINTEGER_OVERFLOW === [thread1Err1ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err9ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW (and 64 more)] === [2024-11-17 07:54:49,404 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-17 07:54:49,404 INFO L85 PathProgramCache]: Analyzing trace with hash -1119907803, now seen corresponding path program 1 times [2024-11-17 07:54:49,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-17 07:54:49,404 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162243595] [2024-11-17 07:54:49,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:49,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-17 07:54:49,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:49,570 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:49,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-17 07:54:49,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162243595] [2024-11-17 07:54:49,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162243595] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-17 07:54:49,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658407606] [2024-11-17 07:54:49,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:49,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-17 07:54:49,573 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-17 07:54:49,574 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-17 07:54:49,577 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-17 07:54:49,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:49,654 INFO L255 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 9 conjuncts are in the unsatisfiable core [2024-11-17 07:54:49,655 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-17 07:54:49,732 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:49,732 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-17 07:54:49,815 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:49,815 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658407606] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-17 07:54:49,815 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-17 07:54:49,815 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2024-11-17 07:54:49,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127902253] [2024-11-17 07:54:49,816 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-17 07:54:49,816 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-17 07:54:49,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-17 07:54:49,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-17 07:54:49,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2024-11-17 07:54:49,899 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 33 out of 113 [2024-11-17 07:54:49,899 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 121 places, 126 transitions, 457 flow. Second operand has 17 states, 17 states have (on average 34.8235294117647) internal successors, (592), 17 states have internal predecessors, (592), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:49,900 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-17 07:54:49,900 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 33 of 113 [2024-11-17 07:54:49,900 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-11-17 07:54:56,984 INFO L124 PetriNetUnfolderBase]: 49228/83546 cut-off events. [2024-11-17 07:54:56,985 INFO L125 PetriNetUnfolderBase]: For 30107/30363 co-relation queries the response was YES. [2024-11-17 07:54:57,340 INFO L83 FinitePrefix]: Finished finitePrefix Result has 178240 conditions, 83546 events. 49228/83546 cut-off events. For 30107/30363 co-relation queries the response was YES. Maximal size of possible extension queue 2762. Compared 768687 event pairs, 34206 based on Foata normal form. 0/61424 useless extension candidates. Maximal degree in co-relation 178108. Up to 50096 conditions per place. [2024-11-17 07:54:57,587 INFO L140 encePairwiseOnDemand]: 101/113 looper letters, 209 selfloop transitions, 33 changer transitions 0/272 dead transitions. [2024-11-17 07:54:57,587 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 132 places, 272 transitions, 1486 flow [2024-11-17 07:54:57,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-17 07:54:57,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2024-11-17 07:54:57,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 575 transitions. [2024-11-17 07:54:57,589 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.42404129793510326 [2024-11-17 07:54:57,589 INFO L175 Difference]: Start difference. First operand has 121 places, 126 transitions, 457 flow. Second operand 12 states and 575 transitions. [2024-11-17 07:54:57,589 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 132 places, 272 transitions, 1486 flow [2024-11-17 07:54:57,611 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 131 places, 272 transitions, 1474 flow, removed 0 selfloop flow, removed 1 redundant places. [2024-11-17 07:54:57,613 INFO L231 Difference]: Finished difference. Result has 137 places, 145 transitions, 708 flow [2024-11-17 07:54:57,614 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=113, PETRI_DIFFERENCE_MINUEND_FLOW=454, PETRI_DIFFERENCE_MINUEND_PLACES=120, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=126, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=14, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=94, PETRI_DIFFERENCE_SUBTRAHEND_STATES=12, PETRI_FLOW=708, PETRI_PLACES=137, PETRI_TRANSITIONS=145} [2024-11-17 07:54:57,614 INFO L277 CegarLoopForPetriNet]: 102 programPoint places, 35 predicate places. [2024-11-17 07:54:57,614 INFO L471 AbstractCegarLoop]: Abstraction has has 137 places, 145 transitions, 708 flow [2024-11-17 07:54:57,615 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 34.8235294117647) internal successors, (592), 17 states have internal predecessors, (592), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:57,615 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-11-17 07:54:57,615 INFO L204 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 4, 1, 1] [2024-11-17 07:54:57,627 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-11-17 07:54:57,819 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-17 07:54:57,819 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [thread1Err1ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err9ASSERT_VIOLATIONINTEGER_OVERFLOW, thread1Err8ASSERT_VIOLATIONINTEGER_OVERFLOW (and 64 more)] === [2024-11-17 07:54:57,820 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-17 07:54:57,820 INFO L85 PathProgramCache]: Analyzing trace with hash 1327562713, now seen corresponding path program 2 times [2024-11-17 07:54:57,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-17 07:54:57,820 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346676620] [2024-11-17 07:54:57,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-17 07:54:57,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-17 07:54:57,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-17 07:54:57,930 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-17 07:54:57,931 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-17 07:54:57,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346676620] [2024-11-17 07:54:57,931 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346676620] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-17 07:54:57,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746719227] [2024-11-17 07:54:57,931 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-11-17 07:54:57,932 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-17 07:54:57,932 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-17 07:54:57,936 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-17 07:54:57,937 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-17 07:54:58,001 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2024-11-17 07:54:58,002 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-17 07:54:58,002 INFO L255 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjuncts are in the unsatisfiable core [2024-11-17 07:54:58,003 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-17 07:54:58,040 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2024-11-17 07:54:58,040 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-17 07:54:58,067 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2024-11-17 07:54:58,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746719227] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-17 07:54:58,067 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-17 07:54:58,067 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 2, 2] total 12 [2024-11-17 07:54:58,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573828714] [2024-11-17 07:54:58,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-17 07:54:58,067 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-17 07:54:58,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-17 07:54:58,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-17 07:54:58,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2024-11-17 07:54:58,096 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 34 out of 113 [2024-11-17 07:54:58,098 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 137 places, 145 transitions, 708 flow. Second operand has 14 states, 14 states have (on average 35.142857142857146) internal successors, (492), 14 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-17 07:54:58,098 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-11-17 07:54:58,098 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 34 of 113 [2024-11-17 07:54:58,098 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand