./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/unreach-call.prp --file ../../../trunk/examples/svcomp/weaver/popl20-bad-dot-product.wvr.c --full-output --witness-type correctness_witness --witnessparser.only.consider.loop.invariants false --validate ./goblint.2023-12-19_14-39-08.files/SV-COMP24_unreach-call/popl20-bad-dot-product.wvr.yml/witness.yml --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 80b1b132 Calling Ultimate with: /root/.sdkman/candidates/java/current/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/AutomizerReachWitnessValidation.xml -i ../../../trunk/examples/svcomp/weaver/popl20-bad-dot-product.wvr.c ./goblint.2023-12-19_14-39-08.files/SV-COMP24_unreach-call/popl20-bad-dot-product.wvr.yml/witness.yml -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --traceabstraction.compute.hoare.annotation.of.negated.interpolant.automaton,.abstraction.and.cfg false --witnessparser.only.consider.loop.invariants false --- Real Ultimate output --- This is Ultimate 0.2.4-?-80b1b13-m [2024-01-31 17:02:18,472 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-01-31 17:02:18,546 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-01-31 17:02:18,551 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-01-31 17:02:18,551 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-01-31 17:02:18,580 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-01-31 17:02:18,581 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-01-31 17:02:18,582 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-01-31 17:02:18,582 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-01-31 17:02:18,585 INFO L153 SettingsManager]: * Use memory slicer=true [2024-01-31 17:02:18,585 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-01-31 17:02:18,586 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-01-31 17:02:18,586 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-01-31 17:02:18,587 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-01-31 17:02:18,588 INFO L153 SettingsManager]: * Use SBE=true [2024-01-31 17:02:18,588 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-01-31 17:02:18,588 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-01-31 17:02:18,588 INFO L153 SettingsManager]: * sizeof long=4 [2024-01-31 17:02:18,588 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-01-31 17:02:18,589 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-01-31 17:02:18,589 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-01-31 17:02:18,589 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-01-31 17:02:18,589 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-01-31 17:02:18,590 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-01-31 17:02:18,590 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-01-31 17:02:18,590 INFO L153 SettingsManager]: * sizeof long double=12 [2024-01-31 17:02:18,590 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-01-31 17:02:18,591 INFO L153 SettingsManager]: * Use constant arrays=true [2024-01-31 17:02:18,591 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-01-31 17:02:18,591 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-01-31 17:02:18,592 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-01-31 17:02:18,592 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-01-31 17:02:18,592 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-01-31 17:02:18,593 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-01-31 17:02:18,593 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-01-31 17:02:18,593 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-01-31 17:02:18,593 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-01-31 17:02:18,593 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-01-31 17:02:18,594 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-01-31 17:02:18,594 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-01-31 17:02:18,594 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2024-01-31 17:02:18,594 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-01-31 17:02:18,594 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-01-31 17:02:18,594 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessparser: Only consider loop invariants -> false [2024-01-31 17:02:18,814 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-01-31 17:02:18,831 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-01-31 17:02:18,832 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-01-31 17:02:18,834 INFO L270 PluginConnector]: Initializing Witness Parser... [2024-01-31 17:02:18,834 INFO L274 PluginConnector]: Witness Parser initialized [2024-01-31 17:02:18,835 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/./goblint.2023-12-19_14-39-08.files/SV-COMP24_unreach-call/popl20-bad-dot-product.wvr.yml/witness.yml [2024-01-31 17:02:18,946 INFO L270 PluginConnector]: Initializing CDTParser... [2024-01-31 17:02:18,947 INFO L274 PluginConnector]: CDTParser initialized [2024-01-31 17:02:18,947 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/weaver/popl20-bad-dot-product.wvr.c [2024-01-31 17:02:19,912 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-01-31 17:02:20,055 INFO L384 CDTParser]: Found 1 translation units. [2024-01-31 17:02:20,055 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/weaver/popl20-bad-dot-product.wvr.c [2024-01-31 17:02:20,061 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/150cd517c/37d8685cff6a496f934aa509bba3448a/FLAG0ec183db2 [2024-01-31 17:02:20,076 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/150cd517c/37d8685cff6a496f934aa509bba3448a [2024-01-31 17:02:20,077 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-01-31 17:02:20,079 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2024-01-31 17:02:20,081 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-01-31 17:02:20,081 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-01-31 17:02:20,085 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-01-31 17:02:20,086 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "witness.yml de.uni_freiburg.informatik.ultimate.witnessparser CORRECTNESS_WITNESS 31.01 05:02:18" (1/2) ... [2024-01-31 17:02:20,087 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@213fa2be and model type witness.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 31.01 05:02:20, skipping insertion in model container [2024-01-31 17:02:20,087 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "witness.yml de.uni_freiburg.informatik.ultimate.witnessparser CORRECTNESS_WITNESS 31.01 05:02:18" (1/2) ... [2024-01-31 17:02:20,088 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@6373dd37 and model type witness.yml de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator CORRECTNESS_WITNESS 31.01 05:02:20, skipping insertion in model container [2024-01-31 17:02:20,088 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 05:02:20" (2/2) ... [2024-01-31 17:02:20,089 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@213fa2be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20, skipping insertion in model container [2024-01-31 17:02:20,089 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 05:02:20" (2/2) ... [2024-01-31 17:02:20,090 INFO L83 nessWitnessExtractor]: Extracting all invariants from correctness witness [2024-01-31 17:02:20,128 INFO L93 nessWitnessExtractor]: Witness did not contain any usable entries. [2024-01-31 17:02:20,145 INFO L179 MainTranslator]: Built tables and reachable declarations [2024-01-31 17:02:20,323 WARN L239 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/weaver/popl20-bad-dot-product.wvr.c[2904,2917] [2024-01-31 17:02:20,336 INFO L209 PostProcessor]: Analyzing one entry point: main [2024-01-31 17:02:20,352 INFO L204 MainTranslator]: Completed pre-run [2024-01-31 17:02:20,384 WARN L239 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/weaver/popl20-bad-dot-product.wvr.c[2904,2917] [2024-01-31 17:02:20,393 INFO L209 PostProcessor]: Analyzing one entry point: main [2024-01-31 17:02:20,406 INFO L208 MainTranslator]: Completed translation [2024-01-31 17:02:20,406 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20 WrapperNode [2024-01-31 17:02:20,407 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-01-31 17:02:20,408 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-01-31 17:02:20,408 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-01-31 17:02:20,408 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-01-31 17:02:20,413 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,431 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,466 INFO L138 Inliner]: procedures = 26, calls = 55, calls flagged for inlining = 16, calls inlined = 22, statements flattened = 290 [2024-01-31 17:02:20,467 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-01-31 17:02:20,467 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-01-31 17:02:20,468 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-01-31 17:02:20,468 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-01-31 17:02:20,476 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,476 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,479 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,502 INFO L175 MemorySlicer]: Split 19 memory accesses to 5 slices as follows [2, 2, 11, 2, 2]. 58 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0, 0, 0]. The 5 writes are split as follows [0, 1, 2, 1, 1]. [2024-01-31 17:02:20,502 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,502 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,508 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,519 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,520 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,522 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,524 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-01-31 17:02:20,525 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-01-31 17:02:20,525 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-01-31 17:02:20,525 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-01-31 17:02:20,526 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (1/1) ... [2024-01-31 17:02:20,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-01-31 17:02:20,544 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-01-31 17:02:20,556 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) [2024-01-31 17:02:20,558 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 [2024-01-31 17:02:20,583 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-01-31 17:02:20,583 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-01-31 17:02:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-01-31 17:02:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-01-31 17:02:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2024-01-31 17:02:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2024-01-31 17:02:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2024-01-31 17:02:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-01-31 17:02:20,584 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-01-31 17:02:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2024-01-31 17:02:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2024-01-31 17:02:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2024-01-31 17:02:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2024-01-31 17:02:20,585 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2024-01-31 17:02:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2024-01-31 17:02:20,585 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2024-01-31 17:02:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2024-01-31 17:02:20,585 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2024-01-31 17:02:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-01-31 17:02:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-01-31 17:02:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2024-01-31 17:02:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2024-01-31 17:02:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2024-01-31 17:02:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2024-01-31 17:02:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2024-01-31 17:02:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2024-01-31 17:02:20,587 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-01-31 17:02:20,587 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-01-31 17:02:20,587 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-01-31 17:02:20,588 WARN L214 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2024-01-31 17:02:20,688 INFO L244 CfgBuilder]: Building ICFG [2024-01-31 17:02:20,689 INFO L270 CfgBuilder]: Building CFG for each procedure with an implementation [2024-01-31 17:02:20,985 INFO L289 CfgBuilder]: Ommited future-live optimization because the input is a concurrent program. [2024-01-31 17:02:20,988 INFO L293 CfgBuilder]: Performing block encoding [2024-01-31 17:02:21,267 INFO L315 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-01-31 17:02:21,267 INFO L320 CfgBuilder]: Removed 8 assume(true) statements. [2024-01-31 17:02:21,268 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 05:02:21 BoogieIcfgContainer [2024-01-31 17:02:21,268 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-01-31 17:02:21,272 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-01-31 17:02:21,272 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-01-31 17:02:21,274 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-01-31 17:02:21,275 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "witness.yml de.uni_freiburg.informatik.ultimate.witnessparser CORRECTNESS_WITNESS 31.01 05:02:18" (1/4) ... [2024-01-31 17:02:21,275 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a0602f4 and model type witness.yml de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CORRECTNESS_WITNESS 31.01 05:02:21, skipping insertion in model container [2024-01-31 17:02:21,275 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 05:02:20" (2/4) ... [2024-01-31 17:02:21,276 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a0602f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 05:02:21, skipping insertion in model container [2024-01-31 17:02:21,276 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 05:02:20" (3/4) ... [2024-01-31 17:02:21,276 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a0602f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 05:02:21, skipping insertion in model container [2024-01-31 17:02:21,277 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 05:02:21" (4/4) ... [2024-01-31 17:02:21,278 INFO L112 eAbstractionObserver]: Analyzing ICFG popl20-bad-dot-product.wvr.c [2024-01-31 17:02:21,292 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-01-31 17:02:21,292 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-01-31 17:02:21,292 INFO L518 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2024-01-31 17:02:21,340 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2024-01-31 17:02:21,374 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 51 places, 52 transitions, 125 flow [2024-01-31 17:02:21,409 INFO L124 PetriNetUnfolderBase]: 11/49 cut-off events. [2024-01-31 17:02:21,410 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2024-01-31 17:02:21,413 INFO L83 FinitePrefix]: Finished finitePrefix Result has 62 conditions, 49 events. 11/49 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 76 event pairs, 0 based on Foata normal form. 0/37 useless extension candidates. Maximal degree in co-relation 39. Up to 2 conditions per place. [2024-01-31 17:02:21,413 INFO L82 GeneralOperation]: Start removeDead. Operand has 51 places, 52 transitions, 125 flow [2024-01-31 17:02:21,416 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 47 places, 48 transitions, 114 flow [2024-01-31 17:02:21,428 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-01-31 17:02:21,433 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=false, 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;@5d5d7b34, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-01-31 17:02:21,433 INFO L358 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2024-01-31 17:02:21,477 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-01-31 17:02:21,477 INFO L124 PetriNetUnfolderBase]: 11/47 cut-off events. [2024-01-31 17:02:21,477 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2024-01-31 17:02:21,478 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:21,478 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:21,479 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:21,482 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:21,482 INFO L85 PathProgramCache]: Analyzing trace with hash -918928211, now seen corresponding path program 1 times [2024-01-31 17:02:21,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:21,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523198498] [2024-01-31 17:02:21,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:21,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:21,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:21,833 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-01-31 17:02:21,833 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:21,834 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523198498] [2024-01-31 17:02:21,835 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [523198498] provided 1 perfect and 0 imperfect interpolant sequences [2024-01-31 17:02:21,835 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-01-31 17:02:21,835 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-01-31 17:02:21,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486352333] [2024-01-31 17:02:21,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-01-31 17:02:21,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-01-31 17:02:21,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:21,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-01-31 17:02:21,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-01-31 17:02:21,871 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 52 [2024-01-31 17:02:21,874 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 48 transitions, 114 flow. Second operand has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 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) [2024-01-31 17:02:21,874 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:21,874 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 52 [2024-01-31 17:02:21,875 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-31 17:02:22,411 INFO L124 PetriNetUnfolderBase]: 4141/5904 cut-off events. [2024-01-31 17:02:22,411 INFO L125 PetriNetUnfolderBase]: For 318/318 co-relation queries the response was YES. [2024-01-31 17:02:22,420 INFO L83 FinitePrefix]: Finished finitePrefix Result has 11854 conditions, 5904 events. 4141/5904 cut-off events. For 318/318 co-relation queries the response was YES. Maximal size of possible extension queue 295. Compared 29957 event pairs, 1127 based on Foata normal form. 623/5272 useless extension candidates. Maximal degree in co-relation 10472. Up to 3653 conditions per place. [2024-01-31 17:02:22,441 INFO L140 encePairwiseOnDemand]: 44/52 looper letters, 67 selfloop transitions, 4 changer transitions 1/76 dead transitions. [2024-01-31 17:02:22,441 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 76 transitions, 329 flow [2024-01-31 17:02:22,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-01-31 17:02:22,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-01-31 17:02:22,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 100 transitions. [2024-01-31 17:02:22,450 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6410256410256411 [2024-01-31 17:02:22,452 INFO L175 Difference]: Start difference. First operand has 47 places, 48 transitions, 114 flow. Second operand 3 states and 100 transitions. [2024-01-31 17:02:22,453 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 76 transitions, 329 flow [2024-01-31 17:02:22,460 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 43 places, 76 transitions, 307 flow, removed 0 selfloop flow, removed 6 redundant places. [2024-01-31 17:02:22,465 INFO L231 Difference]: Finished difference. Result has 44 places, 48 transitions, 122 flow [2024-01-31 17:02:22,467 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=52, PETRI_DIFFERENCE_MINUEND_FLOW=96, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=45, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=122, PETRI_PLACES=44, PETRI_TRANSITIONS=48} [2024-01-31 17:02:22,469 INFO L281 CegarLoopForPetriNet]: 47 programPoint places, -3 predicate places. [2024-01-31 17:02:22,470 INFO L495 AbstractCegarLoop]: Abstraction has has 44 places, 48 transitions, 122 flow [2024-01-31 17:02:22,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 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) [2024-01-31 17:02:22,470 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:22,470 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:22,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-01-31 17:02:22,471 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:22,472 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:22,472 INFO L85 PathProgramCache]: Analyzing trace with hash 180274219, now seen corresponding path program 1 times [2024-01-31 17:02:22,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:22,472 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825922736] [2024-01-31 17:02:22,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:22,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:22,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:22,680 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-01-31 17:02:22,680 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:22,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825922736] [2024-01-31 17:02:22,681 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825922736] provided 1 perfect and 0 imperfect interpolant sequences [2024-01-31 17:02:22,681 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-01-31 17:02:22,681 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-01-31 17:02:22,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007390695] [2024-01-31 17:02:22,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-01-31 17:02:22,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-01-31 17:02:22,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:22,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-01-31 17:02:22,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-01-31 17:02:22,685 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 52 [2024-01-31 17:02:22,685 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 48 transitions, 122 flow. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 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) [2024-01-31 17:02:22,685 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:22,685 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 52 [2024-01-31 17:02:22,685 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-31 17:02:23,087 INFO L124 PetriNetUnfolderBase]: 4142/5899 cut-off events. [2024-01-31 17:02:23,087 INFO L125 PetriNetUnfolderBase]: For 388/388 co-relation queries the response was YES. [2024-01-31 17:02:23,092 INFO L83 FinitePrefix]: Finished finitePrefix Result has 12546 conditions, 5899 events. 4142/5899 cut-off events. For 388/388 co-relation queries the response was YES. Maximal size of possible extension queue 295. Compared 30100 event pairs, 2865 based on Foata normal form. 0/4631 useless extension candidates. Maximal degree in co-relation 4131. Up to 5652 conditions per place. [2024-01-31 17:02:23,112 INFO L140 encePairwiseOnDemand]: 48/52 looper letters, 43 selfloop transitions, 2 changer transitions 2/51 dead transitions. [2024-01-31 17:02:23,112 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 51 transitions, 222 flow [2024-01-31 17:02:23,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-01-31 17:02:23,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2024-01-31 17:02:23,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 73 transitions. [2024-01-31 17:02:23,114 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.35096153846153844 [2024-01-31 17:02:23,114 INFO L175 Difference]: Start difference. First operand has 44 places, 48 transitions, 122 flow. Second operand 4 states and 73 transitions. [2024-01-31 17:02:23,114 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 51 transitions, 222 flow [2024-01-31 17:02:23,115 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 51 transitions, 218 flow, removed 0 selfloop flow, removed 1 redundant places. [2024-01-31 17:02:23,116 INFO L231 Difference]: Finished difference. Result has 48 places, 49 transitions, 132 flow [2024-01-31 17:02:23,116 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=52, PETRI_DIFFERENCE_MINUEND_FLOW=118, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=48, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=46, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=132, PETRI_PLACES=48, PETRI_TRANSITIONS=49} [2024-01-31 17:02:23,116 INFO L281 CegarLoopForPetriNet]: 47 programPoint places, 1 predicate places. [2024-01-31 17:02:23,117 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 49 transitions, 132 flow [2024-01-31 17:02:23,117 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 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) [2024-01-31 17:02:23,117 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:23,117 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:23,117 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-01-31 17:02:23,118 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:23,118 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:23,118 INFO L85 PathProgramCache]: Analyzing trace with hash 1175735483, now seen corresponding path program 1 times [2024-01-31 17:02:23,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:23,118 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869873533] [2024-01-31 17:02:23,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:23,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:23,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:23,234 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-01-31 17:02:23,237 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:23,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869873533] [2024-01-31 17:02:23,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [869873533] provided 0 perfect and 1 imperfect interpolant sequences [2024-01-31 17:02:23,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845753325] [2024-01-31 17:02:23,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:23,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:23,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-01-31 17:02:23,239 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) [2024-01-31 17:02:23,243 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-01-31 17:02:23,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:23,353 INFO L262 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 8 conjunts are in the unsatisfiable core [2024-01-31 17:02:23,357 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-01-31 17:02:23,441 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 9 [2024-01-31 17:02:23,461 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-01-31 17:02:23,461 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-01-31 17:02:23,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845753325] provided 1 perfect and 0 imperfect interpolant sequences [2024-01-31 17:02:23,461 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-01-31 17:02:23,462 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4] total 8 [2024-01-31 17:02:23,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567671043] [2024-01-31 17:02:23,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-01-31 17:02:23,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-01-31 17:02:23,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:23,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-01-31 17:02:23,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2024-01-31 17:02:23,479 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 52 [2024-01-31 17:02:23,484 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 49 transitions, 132 flow. Second operand has 6 states, 6 states have (on average 11.0) internal successors, (66), 6 states have internal predecessors, (66), 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) [2024-01-31 17:02:23,484 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:23,484 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 52 [2024-01-31 17:02:23,484 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-31 17:02:24,251 INFO L124 PetriNetUnfolderBase]: 8253/11673 cut-off events. [2024-01-31 17:02:24,252 INFO L125 PetriNetUnfolderBase]: For 750/750 co-relation queries the response was YES. [2024-01-31 17:02:24,269 INFO L83 FinitePrefix]: Finished finitePrefix Result has 24277 conditions, 11673 events. 8253/11673 cut-off events. For 750/750 co-relation queries the response was YES. Maximal size of possible extension queue 512. Compared 64768 event pairs, 4657 based on Foata normal form. 0/9322 useless extension candidates. Maximal degree in co-relation 24263. Up to 6390 conditions per place. [2024-01-31 17:02:24,368 INFO L140 encePairwiseOnDemand]: 44/52 looper letters, 123 selfloop transitions, 7 changer transitions 0/133 dead transitions. [2024-01-31 17:02:24,368 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 52 places, 133 transitions, 598 flow [2024-01-31 17:02:24,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-01-31 17:02:24,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2024-01-31 17:02:24,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 157 transitions. [2024-01-31 17:02:24,376 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5032051282051282 [2024-01-31 17:02:24,376 INFO L175 Difference]: Start difference. First operand has 48 places, 49 transitions, 132 flow. Second operand 6 states and 157 transitions. [2024-01-31 17:02:24,376 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 52 places, 133 transitions, 598 flow [2024-01-31 17:02:24,379 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 50 places, 133 transitions, 590 flow, removed 3 selfloop flow, removed 2 redundant places. [2024-01-31 17:02:24,382 INFO L231 Difference]: Finished difference. Result has 54 places, 55 transitions, 178 flow [2024-01-31 17:02:24,382 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=52, PETRI_DIFFERENCE_MINUEND_FLOW=126, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=49, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=42, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=178, PETRI_PLACES=54, PETRI_TRANSITIONS=55} [2024-01-31 17:02:24,383 INFO L281 CegarLoopForPetriNet]: 47 programPoint places, 7 predicate places. [2024-01-31 17:02:24,383 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 55 transitions, 178 flow [2024-01-31 17:02:24,385 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.0) internal successors, (66), 6 states have internal predecessors, (66), 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) [2024-01-31 17:02:24,385 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:24,385 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:24,403 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-01-31 17:02:24,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:24,597 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:24,597 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:24,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1502741770, now seen corresponding path program 1 times [2024-01-31 17:02:24,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:24,597 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128909063] [2024-01-31 17:02:24,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:24,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:24,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:24,696 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-01-31 17:02:24,696 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:24,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128909063] [2024-01-31 17:02:24,696 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128909063] provided 0 perfect and 1 imperfect interpolant sequences [2024-01-31 17:02:24,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325142814] [2024-01-31 17:02:24,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:24,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:24,697 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-01-31 17:02:24,698 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) [2024-01-31 17:02:24,700 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-01-31 17:02:24,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:24,800 INFO L262 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 6 conjunts are in the unsatisfiable core [2024-01-31 17:02:24,801 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-01-31 17:02:24,831 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-01-31 17:02:24,831 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-01-31 17:02:24,866 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-01-31 17:02:24,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325142814] provided 1 perfect and 1 imperfect interpolant sequences [2024-01-31 17:02:24,866 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2024-01-31 17:02:24,866 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 4] total 9 [2024-01-31 17:02:24,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441635306] [2024-01-31 17:02:24,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-01-31 17:02:24,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-01-31 17:02:24,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:24,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-01-31 17:02:24,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2024-01-31 17:02:24,871 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 52 [2024-01-31 17:02:24,872 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 55 transitions, 178 flow. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 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) [2024-01-31 17:02:24,872 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:24,872 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 52 [2024-01-31 17:02:24,872 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-31 17:02:25,580 INFO L124 PetriNetUnfolderBase]: 8242/11742 cut-off events. [2024-01-31 17:02:25,580 INFO L125 PetriNetUnfolderBase]: For 2945/3087 co-relation queries the response was YES. [2024-01-31 17:02:25,595 INFO L83 FinitePrefix]: Finished finitePrefix Result has 27087 conditions, 11742 events. 8242/11742 cut-off events. For 2945/3087 co-relation queries the response was YES. Maximal size of possible extension queue 477. Compared 64870 event pairs, 2858 based on Foata normal form. 530/10314 useless extension candidates. Maximal degree in co-relation 27065. Up to 6098 conditions per place. [2024-01-31 17:02:25,632 INFO L140 encePairwiseOnDemand]: 46/52 looper letters, 68 selfloop transitions, 7 changer transitions 0/80 dead transitions. [2024-01-31 17:02:25,632 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 80 transitions, 394 flow [2024-01-31 17:02:25,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-01-31 17:02:25,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2024-01-31 17:02:25,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 100 transitions. [2024-01-31 17:02:25,634 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.38461538461538464 [2024-01-31 17:02:25,634 INFO L175 Difference]: Start difference. First operand has 54 places, 55 transitions, 178 flow. Second operand 5 states and 100 transitions. [2024-01-31 17:02:25,634 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 80 transitions, 394 flow [2024-01-31 17:02:25,650 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 80 transitions, 390 flow, removed 1 selfloop flow, removed 1 redundant places. [2024-01-31 17:02:25,651 INFO L231 Difference]: Finished difference. Result has 59 places, 57 transitions, 215 flow [2024-01-31 17:02:25,652 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=52, PETRI_DIFFERENCE_MINUEND_FLOW=174, PETRI_DIFFERENCE_MINUEND_PLACES=53, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=55, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=48, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=215, PETRI_PLACES=59, PETRI_TRANSITIONS=57} [2024-01-31 17:02:25,653 INFO L281 CegarLoopForPetriNet]: 47 programPoint places, 12 predicate places. [2024-01-31 17:02:25,653 INFO L495 AbstractCegarLoop]: Abstraction has has 59 places, 57 transitions, 215 flow [2024-01-31 17:02:25,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 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) [2024-01-31 17:02:25,655 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:25,656 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:25,669 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-01-31 17:02:25,867 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2024-01-31 17:02:25,868 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:25,868 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:25,868 INFO L85 PathProgramCache]: Analyzing trace with hash 1059553159, now seen corresponding path program 1 times [2024-01-31 17:02:25,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:25,868 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485875875] [2024-01-31 17:02:25,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:25,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:25,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:26,024 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-01-31 17:02:26,024 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:26,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485875875] [2024-01-31 17:02:26,025 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485875875] provided 0 perfect and 1 imperfect interpolant sequences [2024-01-31 17:02:26,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759261004] [2024-01-31 17:02:26,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:26,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:26,025 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-01-31 17:02:26,026 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) [2024-01-31 17:02:26,028 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-01-31 17:02:26,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:26,161 INFO L262 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 9 conjunts are in the unsatisfiable core [2024-01-31 17:02:26,163 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-01-31 17:02:26,216 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2024-01-31 17:02:26,231 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-01-31 17:02:26,231 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-01-31 17:02:26,264 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 9 [2024-01-31 17:02:26,306 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-01-31 17:02:26,307 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759261004] provided 0 perfect and 2 imperfect interpolant sequences [2024-01-31 17:02:26,307 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-01-31 17:02:26,307 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2024-01-31 17:02:26,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588283053] [2024-01-31 17:02:26,308 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-01-31 17:02:26,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-01-31 17:02:26,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:26,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-01-31 17:02:26,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2024-01-31 17:02:26,336 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 52 [2024-01-31 17:02:26,336 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 57 transitions, 215 flow. Second operand has 15 states, 15 states have (on average 8.866666666666667) internal successors, (133), 15 states have internal predecessors, (133), 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) [2024-01-31 17:02:26,337 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:26,337 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 52 [2024-01-31 17:02:26,337 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-31 17:02:27,912 INFO L124 PetriNetUnfolderBase]: 13406/18976 cut-off events. [2024-01-31 17:02:27,913 INFO L125 PetriNetUnfolderBase]: For 12415/12415 co-relation queries the response was YES. [2024-01-31 17:02:27,942 INFO L83 FinitePrefix]: Finished finitePrefix Result has 48157 conditions, 18976 events. 13406/18976 cut-off events. For 12415/12415 co-relation queries the response was YES. Maximal size of possible extension queue 720. Compared 110728 event pairs, 7280 based on Foata normal form. 0/15892 useless extension candidates. Maximal degree in co-relation 48131. Up to 7110 conditions per place. [2024-01-31 17:02:28,009 INFO L140 encePairwiseOnDemand]: 44/52 looper letters, 124 selfloop transitions, 15 changer transitions 0/142 dead transitions. [2024-01-31 17:02:28,010 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 142 transitions, 729 flow [2024-01-31 17:02:28,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-01-31 17:02:28,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2024-01-31 17:02:28,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 165 transitions. [2024-01-31 17:02:28,011 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4532967032967033 [2024-01-31 17:02:28,011 INFO L175 Difference]: Start difference. First operand has 59 places, 57 transitions, 215 flow. Second operand 7 states and 165 transitions. [2024-01-31 17:02:28,011 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 142 transitions, 729 flow [2024-01-31 17:02:28,069 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 62 places, 142 transitions, 718 flow, removed 0 selfloop flow, removed 3 redundant places. [2024-01-31 17:02:28,071 INFO L231 Difference]: Finished difference. Result has 66 places, 64 transitions, 314 flow [2024-01-31 17:02:28,071 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=52, PETRI_DIFFERENCE_MINUEND_FLOW=207, PETRI_DIFFERENCE_MINUEND_PLACES=56, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=57, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=42, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=314, PETRI_PLACES=66, PETRI_TRANSITIONS=64} [2024-01-31 17:02:28,072 INFO L281 CegarLoopForPetriNet]: 47 programPoint places, 19 predicate places. [2024-01-31 17:02:28,072 INFO L495 AbstractCegarLoop]: Abstraction has has 66 places, 64 transitions, 314 flow [2024-01-31 17:02:28,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 8.866666666666667) internal successors, (133), 15 states have internal predecessors, (133), 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) [2024-01-31 17:02:28,072 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:28,072 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:28,090 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-01-31 17:02:28,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:28,286 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:28,286 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:28,286 INFO L85 PathProgramCache]: Analyzing trace with hash -749270169, now seen corresponding path program 2 times [2024-01-31 17:02:28,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:28,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160315075] [2024-01-31 17:02:28,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:28,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:28,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:28,365 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-01-31 17:02:28,365 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:28,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160315075] [2024-01-31 17:02:28,366 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160315075] provided 0 perfect and 1 imperfect interpolant sequences [2024-01-31 17:02:28,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880183486] [2024-01-31 17:02:28,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-01-31 17:02:28,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:28,366 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-01-31 17:02:28,367 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-01-31 17:02:28,389 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-01-31 17:02:28,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-01-31 17:02:28,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2024-01-31 17:02:28,478 INFO L262 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 3 conjunts are in the unsatisfiable core [2024-01-31 17:02:28,479 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-01-31 17:02:28,540 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-01-31 17:02:28,540 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-01-31 17:02:28,567 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-01-31 17:02:28,568 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880183486] provided 0 perfect and 2 imperfect interpolant sequences [2024-01-31 17:02:28,568 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-01-31 17:02:28,568 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2024-01-31 17:02:28,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806868129] [2024-01-31 17:02:28,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-01-31 17:02:28,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-01-31 17:02:28,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:28,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-01-31 17:02:28,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-01-31 17:02:28,572 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 52 [2024-01-31 17:02:28,573 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 66 places, 64 transitions, 314 flow. Second operand has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 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) [2024-01-31 17:02:28,573 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:28,573 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 52 [2024-01-31 17:02:28,573 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-31 17:02:29,863 INFO L124 PetriNetUnfolderBase]: 13293/19073 cut-off events. [2024-01-31 17:02:29,863 INFO L125 PetriNetUnfolderBase]: For 29850/30486 co-relation queries the response was YES. [2024-01-31 17:02:29,897 INFO L83 FinitePrefix]: Finished finitePrefix Result has 51658 conditions, 19073 events. 13293/19073 cut-off events. For 29850/30486 co-relation queries the response was YES. Maximal size of possible extension queue 710. Compared 114921 event pairs, 4081 based on Foata normal form. 636/16751 useless extension candidates. Maximal degree in co-relation 51628. Up to 10840 conditions per place. [2024-01-31 17:02:29,955 INFO L140 encePairwiseOnDemand]: 47/52 looper letters, 85 selfloop transitions, 6 changer transitions 0/97 dead transitions. [2024-01-31 17:02:29,955 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 69 places, 97 transitions, 677 flow [2024-01-31 17:02:29,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-01-31 17:02:29,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2024-01-31 17:02:29,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 92 transitions. [2024-01-31 17:02:29,956 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4423076923076923 [2024-01-31 17:02:29,957 INFO L175 Difference]: Start difference. First operand has 66 places, 64 transitions, 314 flow. Second operand 4 states and 92 transitions. [2024-01-31 17:02:29,957 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 69 places, 97 transitions, 677 flow [2024-01-31 17:02:29,971 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 67 places, 97 transitions, 644 flow, removed 14 selfloop flow, removed 2 redundant places. [2024-01-31 17:02:29,972 INFO L231 Difference]: Finished difference. Result has 69 places, 65 transitions, 318 flow [2024-01-31 17:02:29,973 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=52, PETRI_DIFFERENCE_MINUEND_FLOW=291, PETRI_DIFFERENCE_MINUEND_PLACES=64, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=64, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=58, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=318, PETRI_PLACES=69, PETRI_TRANSITIONS=65} [2024-01-31 17:02:29,973 INFO L281 CegarLoopForPetriNet]: 47 programPoint places, 22 predicate places. [2024-01-31 17:02:29,973 INFO L495 AbstractCegarLoop]: Abstraction has has 69 places, 65 transitions, 318 flow [2024-01-31 17:02:29,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 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) [2024-01-31 17:02:29,974 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:29,974 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:30,018 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-01-31 17:02:30,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:30,189 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:30,189 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:30,192 INFO L85 PathProgramCache]: Analyzing trace with hash -920894698, now seen corresponding path program 1 times [2024-01-31 17:02:30,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:30,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097658938] [2024-01-31 17:02:30,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:30,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:30,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:30,413 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-01-31 17:02:30,414 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:30,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097658938] [2024-01-31 17:02:30,414 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1097658938] provided 1 perfect and 0 imperfect interpolant sequences [2024-01-31 17:02:30,414 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-01-31 17:02:30,414 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2024-01-31 17:02:30,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255001973] [2024-01-31 17:02:30,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-01-31 17:02:30,415 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-01-31 17:02:30,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:30,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-01-31 17:02:30,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2024-01-31 17:02:30,426 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 52 [2024-01-31 17:02:30,426 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 65 transitions, 318 flow. Second operand has 6 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 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) [2024-01-31 17:02:30,426 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:30,427 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 52 [2024-01-31 17:02:30,427 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-31 17:02:31,771 INFO L124 PetriNetUnfolderBase]: 13763/19251 cut-off events. [2024-01-31 17:02:31,771 INFO L125 PetriNetUnfolderBase]: For 30776/31399 co-relation queries the response was YES. [2024-01-31 17:02:31,808 INFO L83 FinitePrefix]: Finished finitePrefix Result has 56104 conditions, 19251 events. 13763/19251 cut-off events. For 30776/31399 co-relation queries the response was YES. Maximal size of possible extension queue 664. Compared 107873 event pairs, 9223 based on Foata normal form. 623/17592 useless extension candidates. Maximal degree in co-relation 56073. Up to 14233 conditions per place. [2024-01-31 17:02:31,868 INFO L140 encePairwiseOnDemand]: 44/52 looper letters, 122 selfloop transitions, 8 changer transitions 0/135 dead transitions. [2024-01-31 17:02:31,869 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 74 places, 135 transitions, 853 flow [2024-01-31 17:02:31,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-01-31 17:02:31,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2024-01-31 17:02:31,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 148 transitions. [2024-01-31 17:02:31,870 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.47435897435897434 [2024-01-31 17:02:31,870 INFO L175 Difference]: Start difference. First operand has 69 places, 65 transitions, 318 flow. Second operand 6 states and 148 transitions. [2024-01-31 17:02:31,870 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 74 places, 135 transitions, 853 flow [2024-01-31 17:02:31,896 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 72 places, 135 transitions, 844 flow, removed 0 selfloop flow, removed 2 redundant places. [2024-01-31 17:02:31,897 INFO L231 Difference]: Finished difference. Result has 75 places, 70 transitions, 369 flow [2024-01-31 17:02:31,897 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=52, PETRI_DIFFERENCE_MINUEND_FLOW=312, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=65, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=369, PETRI_PLACES=75, PETRI_TRANSITIONS=70} [2024-01-31 17:02:31,898 INFO L281 CegarLoopForPetriNet]: 47 programPoint places, 28 predicate places. [2024-01-31 17:02:31,898 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 70 transitions, 369 flow [2024-01-31 17:02:31,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 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) [2024-01-31 17:02:31,898 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:31,898 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:31,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2024-01-31 17:02:31,899 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:31,899 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:31,899 INFO L85 PathProgramCache]: Analyzing trace with hash 979705758, now seen corresponding path program 1 times [2024-01-31 17:02:31,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:31,899 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017919660] [2024-01-31 17:02:31,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:31,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:31,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:32,008 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-01-31 17:02:32,008 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:32,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017919660] [2024-01-31 17:02:32,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017919660] provided 0 perfect and 1 imperfect interpolant sequences [2024-01-31 17:02:32,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715997084] [2024-01-31 17:02:32,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:32,009 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:32,009 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-01-31 17:02:32,010 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-01-31 17:02:32,011 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-01-31 17:02:32,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:32,110 INFO L262 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 9 conjunts are in the unsatisfiable core [2024-01-31 17:02:32,111 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-01-31 17:02:32,164 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2024-01-31 17:02:32,173 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-01-31 17:02:32,173 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-01-31 17:02:32,194 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 9 [2024-01-31 17:02:32,237 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-01-31 17:02:32,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715997084] provided 0 perfect and 2 imperfect interpolant sequences [2024-01-31 17:02:32,237 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-01-31 17:02:32,237 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2024-01-31 17:02:32,238 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197586539] [2024-01-31 17:02:32,238 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-01-31 17:02:32,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-01-31 17:02:32,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:32,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-01-31 17:02:32,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2024-01-31 17:02:32,269 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 52 [2024-01-31 17:02:32,270 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 70 transitions, 369 flow. Second operand has 15 states, 15 states have (on average 9.066666666666666) internal successors, (136), 15 states have internal predecessors, (136), 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) [2024-01-31 17:02:32,270 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:32,270 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 52 [2024-01-31 17:02:32,270 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-31 17:02:33,563 INFO L124 PetriNetUnfolderBase]: 12679/17752 cut-off events. [2024-01-31 17:02:33,563 INFO L125 PetriNetUnfolderBase]: For 31168/31739 co-relation queries the response was YES. [2024-01-31 17:02:33,607 INFO L83 FinitePrefix]: Finished finitePrefix Result has 54774 conditions, 17752 events. 12679/17752 cut-off events. For 31168/31739 co-relation queries the response was YES. Maximal size of possible extension queue 605. Compared 98721 event pairs, 7421 based on Foata normal form. 571/16311 useless extension candidates. Maximal degree in co-relation 54739. Up to 8023 conditions per place. [2024-01-31 17:02:33,661 INFO L140 encePairwiseOnDemand]: 44/52 looper letters, 128 selfloop transitions, 15 changer transitions 0/148 dead transitions. [2024-01-31 17:02:33,661 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 81 places, 148 transitions, 1017 flow [2024-01-31 17:02:33,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-01-31 17:02:33,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2024-01-31 17:02:33,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 156 transitions. [2024-01-31 17:02:33,662 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42857142857142855 [2024-01-31 17:02:33,662 INFO L175 Difference]: Start difference. First operand has 75 places, 70 transitions, 369 flow. Second operand 7 states and 156 transitions. [2024-01-31 17:02:33,662 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 81 places, 148 transitions, 1017 flow [2024-01-31 17:02:33,761 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 148 transitions, 1012 flow, removed 0 selfloop flow, removed 2 redundant places. [2024-01-31 17:02:33,763 INFO L231 Difference]: Finished difference. Result has 82 places, 75 transitions, 456 flow [2024-01-31 17:02:33,763 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=52, PETRI_DIFFERENCE_MINUEND_FLOW=364, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=456, PETRI_PLACES=82, PETRI_TRANSITIONS=75} [2024-01-31 17:02:33,764 INFO L281 CegarLoopForPetriNet]: 47 programPoint places, 35 predicate places. [2024-01-31 17:02:33,764 INFO L495 AbstractCegarLoop]: Abstraction has has 82 places, 75 transitions, 456 flow [2024-01-31 17:02:33,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 9.066666666666666) internal successors, (136), 15 states have internal predecessors, (136), 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) [2024-01-31 17:02:33,764 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:33,764 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:33,788 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-01-31 17:02:33,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:33,975 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:33,976 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:33,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1682120188, now seen corresponding path program 1 times [2024-01-31 17:02:33,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:33,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66825597] [2024-01-31 17:02:33,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:33,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:34,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:34,873 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-01-31 17:02:34,873 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:34,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66825597] [2024-01-31 17:02:34,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66825597] provided 0 perfect and 1 imperfect interpolant sequences [2024-01-31 17:02:34,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700942333] [2024-01-31 17:02:34,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:34,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:34,874 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-01-31 17:02:34,875 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-01-31 17:02:34,877 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-01-31 17:02:34,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:34,991 INFO L262 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 30 conjunts are in the unsatisfiable core [2024-01-31 17:02:34,998 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-01-31 17:02:35,020 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 5 [2024-01-31 17:02:35,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,025 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2024-01-31 17:02:35,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,041 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2024-01-31 17:02:35,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,047 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,050 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2024-01-31 17:02:35,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,060 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2024-01-31 17:02:35,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,065 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,080 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 7 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 1 [2024-01-31 17:02:35,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,088 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2024-01-31 17:02:35,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,097 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2024-01-31 17:02:35,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,102 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,109 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,112 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2024-01-31 17:02:35,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,117 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2024-01-31 17:02:35,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,121 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,129 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2024-01-31 17:02:35,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,134 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,139 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2024-01-31 17:02:35,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,143 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,150 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,155 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2024-01-31 17:02:35,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,162 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2024-01-31 17:02:35,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-01-31 17:02:35,165 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2024-01-31 17:02:35,191 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-01-31 17:02:35,221 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2024-01-31 17:02:35,222 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2024-01-31 17:02:35,240 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2024-01-31 17:02:35,244 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2024-01-31 17:02:35,440 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2024-01-31 17:02:35,468 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-01-31 17:02:35,468 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-01-31 17:02:35,948 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-01-31 17:02:35,948 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 37 [2024-01-31 17:02:35,959 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2024-01-31 17:02:35,959 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 42 [2024-01-31 17:02:35,968 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2024-01-31 17:02:35,968 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 15 [2024-01-31 17:02:36,023 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-01-31 17:02:36,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700942333] provided 0 perfect and 2 imperfect interpolant sequences [2024-01-31 17:02:36,024 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-01-31 17:02:36,024 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 39 [2024-01-31 17:02:36,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413769317] [2024-01-31 17:02:36,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-01-31 17:02:36,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2024-01-31 17:02:36,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:36,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2024-01-31 17:02:36,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1361, Unknown=2, NotChecked=0, Total=1560 [2024-01-31 17:02:36,245 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 52 [2024-01-31 17:02:36,245 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 82 places, 75 transitions, 456 flow. Second operand has 40 states, 40 states have (on average 6.3) internal successors, (252), 40 states have internal predecessors, (252), 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) [2024-01-31 17:02:36,245 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:36,245 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 52 [2024-01-31 17:02:36,245 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-31 17:02:47,381 INFO L124 PetriNetUnfolderBase]: 74676/102387 cut-off events. [2024-01-31 17:02:47,381 INFO L125 PetriNetUnfolderBase]: For 156650/156650 co-relation queries the response was YES. [2024-01-31 17:02:47,799 INFO L83 FinitePrefix]: Finished finitePrefix Result has 326187 conditions, 102387 events. 74676/102387 cut-off events. For 156650/156650 co-relation queries the response was YES. Maximal size of possible extension queue 2182. Compared 635351 event pairs, 29275 based on Foata normal form. 0/90435 useless extension candidates. Maximal degree in co-relation 248782. Up to 22884 conditions per place. [2024-01-31 17:02:48,082 INFO L140 encePairwiseOnDemand]: 33/52 looper letters, 917 selfloop transitions, 110 changer transitions 0/1028 dead transitions. [2024-01-31 17:02:48,082 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 125 places, 1028 transitions, 6358 flow [2024-01-31 17:02:48,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2024-01-31 17:02:48,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2024-01-31 17:02:48,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 1072 transitions. [2024-01-31 17:02:48,085 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46853146853146854 [2024-01-31 17:02:48,086 INFO L175 Difference]: Start difference. First operand has 82 places, 75 transitions, 456 flow. Second operand 44 states and 1072 transitions. [2024-01-31 17:02:48,086 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 125 places, 1028 transitions, 6358 flow [2024-01-31 17:02:51,036 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 122 places, 1028 transitions, 6070 flow, removed 136 selfloop flow, removed 3 redundant places. [2024-01-31 17:02:51,041 INFO L231 Difference]: Finished difference. Result has 159 places, 183 transitions, 1662 flow [2024-01-31 17:02:51,042 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=52, PETRI_DIFFERENCE_MINUEND_FLOW=436, PETRI_DIFFERENCE_MINUEND_PLACES=79, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=75, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=43, PETRI_DIFFERENCE_SUBTRAHEND_STATES=44, PETRI_FLOW=1662, PETRI_PLACES=159, PETRI_TRANSITIONS=183} [2024-01-31 17:02:51,042 INFO L281 CegarLoopForPetriNet]: 47 programPoint places, 112 predicate places. [2024-01-31 17:02:51,042 INFO L495 AbstractCegarLoop]: Abstraction has has 159 places, 183 transitions, 1662 flow [2024-01-31 17:02:51,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 6.3) internal successors, (252), 40 states have internal predecessors, (252), 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) [2024-01-31 17:02:51,043 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-31 17:02:51,043 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-31 17:02:51,056 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-01-31 17:02:51,243 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:51,244 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (and 1 more)] === [2024-01-31 17:02:51,244 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-31 17:02:51,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1300293062, now seen corresponding path program 2 times [2024-01-31 17:02:51,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-31 17:02:51,245 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760166543] [2024-01-31 17:02:51,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-31 17:02:51,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-31 17:02:51,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-31 17:02:51,818 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-01-31 17:02:51,819 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-31 17:02:51,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760166543] [2024-01-31 17:02:51,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760166543] provided 0 perfect and 1 imperfect interpolant sequences [2024-01-31 17:02:51,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578949689] [2024-01-31 17:02:51,819 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-01-31 17:02:51,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-01-31 17:02:51,819 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-01-31 17:02:51,820 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-01-31 17:02:51,821 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-01-31 17:02:51,950 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-01-31 17:02:51,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2024-01-31 17:02:51,952 INFO L262 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 21 conjunts are in the unsatisfiable core [2024-01-31 17:02:51,953 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-01-31 17:02:52,124 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2024-01-31 17:02:52,138 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-01-31 17:02:52,138 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-01-31 17:02:52,205 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-01-31 17:02:52,206 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 15 [2024-01-31 17:02:52,295 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-01-31 17:02:52,296 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578949689] provided 0 perfect and 2 imperfect interpolant sequences [2024-01-31 17:02:52,296 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-01-31 17:02:52,296 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 35 [2024-01-31 17:02:52,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793788638] [2024-01-31 17:02:52,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-01-31 17:02:52,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2024-01-31 17:02:52,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-31 17:02:52,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2024-01-31 17:02:52,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1105, Unknown=0, NotChecked=0, Total=1260 [2024-01-31 17:02:52,433 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 52 [2024-01-31 17:02:52,434 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 159 places, 183 transitions, 1662 flow. Second operand has 36 states, 36 states have (on average 7.25) internal successors, (261), 36 states have internal predecessors, (261), 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) [2024-01-31 17:02:52,434 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-31 17:02:52,434 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 52 [2024-01-31 17:02:52,434 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand