./Ultimate.py --spec /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/properties/no-data-race.prp --file /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix007.opt.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for data races Using default analysis Version 61a67961 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/AutomizerReach.xml -i /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix007.opt.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! data-race) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 98fb631b7747d0724c093b074b80cf02851c21b4b9e1af2c5f1e3d032d6b592f --- Real Ultimate output --- This is Ultimate 0.2.5-wip.fs.cvc5-61a6796-m [2024-10-14 16:50:47,068 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-10-14 16:50:47,139 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DataRace-32bit-Automizer_Default.epf [2024-10-14 16:50:47,145 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-10-14 16:50:47,146 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-10-14 16:50:47,167 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-10-14 16:50:47,168 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-10-14 16:50:47,168 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-10-14 16:50:47,169 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-10-14 16:50:47,170 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-10-14 16:50:47,170 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-10-14 16:50:47,170 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-10-14 16:50:47,171 INFO L153 SettingsManager]: * Use SBE=true [2024-10-14 16:50:47,171 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-10-14 16:50:47,172 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-10-14 16:50:47,172 INFO L153 SettingsManager]: * sizeof long=4 [2024-10-14 16:50:47,172 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-10-14 16:50:47,173 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-10-14 16:50:47,173 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-10-14 16:50:47,174 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-10-14 16:50:47,178 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-10-14 16:50:47,179 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-10-14 16:50:47,179 INFO L153 SettingsManager]: * Check absence of data races in concurrent programs=true [2024-10-14 16:50:47,179 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-10-14 16:50:47,179 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-10-14 16:50:47,180 INFO L153 SettingsManager]: * sizeof long double=12 [2024-10-14 16:50:47,180 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-10-14 16:50:47,180 INFO L153 SettingsManager]: * Use constant arrays=true [2024-10-14 16:50:47,180 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-10-14 16:50:47,181 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-10-14 16:50:47,181 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-10-14 16:50:47,181 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-14 16:50:47,181 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-10-14 16:50:47,182 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-10-14 16:50:47,182 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-10-14 16:50:47,183 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-10-14 16:50:47,183 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-10-14 16:50:47,183 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-10-14 16:50:47,184 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-10-14 16:50:47,184 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-10-14 16:50:47,184 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-10-14 16:50:47,185 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! data-race) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 98fb631b7747d0724c093b074b80cf02851c21b4b9e1af2c5f1e3d032d6b592f [2024-10-14 16:50:47,449 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-10-14 16:50:47,473 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-10-14 16:50:47,476 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-10-14 16:50:47,477 INFO L270 PluginConnector]: Initializing CDTParser... [2024-10-14 16:50:47,477 INFO L274 PluginConnector]: CDTParser initialized [2024-10-14 16:50:47,478 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix007.opt.i [2024-10-14 16:50:48,997 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-10-14 16:50:49,254 INFO L384 CDTParser]: Found 1 translation units. [2024-10-14 16:50:49,255 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/pthread-wmm/mix007.opt.i [2024-10-14 16:50:49,275 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4541ecbf8/744147cce88f4bf79cf6a1d9fc4e5ae6/FLAG28f7197c2 [2024-10-14 16:50:49,569 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4541ecbf8/744147cce88f4bf79cf6a1d9fc4e5ae6 [2024-10-14 16:50:49,571 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-10-14 16:50:49,572 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-10-14 16:50:49,574 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-10-14 16:50:49,574 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-10-14 16:50:49,579 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-10-14 16:50:49,580 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 04:50:49" (1/1) ... [2024-10-14 16:50:49,581 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@267829d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:49, skipping insertion in model container [2024-10-14 16:50:49,581 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 04:50:49" (1/1) ... [2024-10-14 16:50:49,635 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-10-14 16:50:50,098 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-14 16:50:50,115 INFO L200 MainTranslator]: Completed pre-run [2024-10-14 16:50:50,225 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-14 16:50:50,262 INFO L204 MainTranslator]: Completed translation [2024-10-14 16:50:50,263 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50 WrapperNode [2024-10-14 16:50:50,263 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-10-14 16:50:50,264 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-10-14 16:50:50,264 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-10-14 16:50:50,264 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-10-14 16:50:50,270 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,303 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,349 INFO L138 Inliner]: procedures = 176, calls = 56, calls flagged for inlining = 6, calls inlined = 7, statements flattened = 971 [2024-10-14 16:50:50,349 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-10-14 16:50:50,350 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-10-14 16:50:50,350 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-10-14 16:50:50,350 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-10-14 16:50:50,360 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,360 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,369 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,369 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,394 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,402 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,406 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,412 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,426 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-10-14 16:50:50,428 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-10-14 16:50:50,428 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-10-14 16:50:50,428 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-10-14 16:50:50,429 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (1/1) ... [2024-10-14 16:50:50,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-14 16:50:50,455 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-14 16:50:50,479 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) [2024-10-14 16:50:50,487 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 [2024-10-14 16:50:50,534 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2024-10-14 16:50:50,535 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-10-14 16:50:50,536 INFO L130 BoogieDeclarations]: Found specification of procedure P0 [2024-10-14 16:50:50,536 INFO L138 BoogieDeclarations]: Found implementation of procedure P0 [2024-10-14 16:50:50,536 INFO L130 BoogieDeclarations]: Found specification of procedure P1 [2024-10-14 16:50:50,536 INFO L138 BoogieDeclarations]: Found implementation of procedure P1 [2024-10-14 16:50:50,536 INFO L130 BoogieDeclarations]: Found specification of procedure P2 [2024-10-14 16:50:50,537 INFO L138 BoogieDeclarations]: Found implementation of procedure P2 [2024-10-14 16:50:50,537 INFO L130 BoogieDeclarations]: Found specification of procedure P3 [2024-10-14 16:50:50,538 INFO L138 BoogieDeclarations]: Found implementation of procedure P3 [2024-10-14 16:50:50,538 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-10-14 16:50:50,538 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2024-10-14 16:50:50,538 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-10-14 16:50:50,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-10-14 16:50:50,542 WARN L207 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement. [2024-10-14 16:50:50,798 INFO L238 CfgBuilder]: Building ICFG [2024-10-14 16:50:50,800 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-10-14 16:50:52,464 INFO L283 CfgBuilder]: Omitted future-live optimization because the input is a concurrent program. [2024-10-14 16:50:52,464 INFO L287 CfgBuilder]: Performing block encoding [2024-10-14 16:50:58,753 INFO L309 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-10-14 16:50:58,755 INFO L314 CfgBuilder]: Removed 0 assume(true) statements. [2024-10-14 16:50:58,756 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 04:50:58 BoogieIcfgContainer [2024-10-14 16:50:58,756 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-10-14 16:50:58,758 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-10-14 16:50:58,760 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-10-14 16:50:58,763 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-10-14 16:50:58,763 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 04:50:49" (1/3) ... [2024-10-14 16:50:58,764 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4730a96c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 04:50:58, skipping insertion in model container [2024-10-14 16:50:58,764 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 04:50:50" (2/3) ... [2024-10-14 16:50:58,765 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4730a96c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 04:50:58, skipping insertion in model container [2024-10-14 16:50:58,765 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 04:50:58" (3/3) ... [2024-10-14 16:50:58,767 INFO L112 eAbstractionObserver]: Analyzing ICFG mix007.opt.i [2024-10-14 16:50:58,790 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-10-14 16:50:58,790 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 296 error locations. [2024-10-14 16:50:58,791 INFO L484 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2024-10-14 16:50:59,343 INFO L143 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2024-10-14 16:50:59,399 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 440 places, 430 transitions, 876 flow [2024-10-14 16:50:59,560 INFO L124 PetriNetUnfolderBase]: 3/426 cut-off events. [2024-10-14 16:50:59,560 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-14 16:50:59,579 INFO L83 FinitePrefix]: Finished finitePrefix Result has 439 conditions, 426 events. 3/426 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 100. Compared 2570 event pairs, 0 based on Foata normal form. 0/127 useless extension candidates. Maximal degree in co-relation 387. Up to 2 conditions per place. [2024-10-14 16:50:59,580 INFO L82 GeneralOperation]: Start removeDead. Operand has 440 places, 430 transitions, 876 flow [2024-10-14 16:50:59,609 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 436 places, 426 transitions, 864 flow [2024-10-14 16:50:59,620 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-14 16:50:59,626 INFO L333 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@3b6041b9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-14 16:50:59,627 INFO L334 AbstractCegarLoop]: Starting to check reachability of 557 error locations. [2024-10-14 16:50:59,634 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-10-14 16:50:59,634 INFO L124 PetriNetUnfolderBase]: 0/48 cut-off events. [2024-10-14 16:50:59,634 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-14 16:50:59,634 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-14 16:50:59,635 INFO L204 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-14 16:50:59,635 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting P0Err0ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 553 more)] === [2024-10-14 16:50:59,642 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-14 16:50:59,643 INFO L85 PathProgramCache]: Analyzing trace with hash 1015846372, now seen corresponding path program 1 times [2024-10-14 16:50:59,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-14 16:50:59,653 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276238597] [2024-10-14 16:50:59,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-14 16:50:59,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-14 16:50:59,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-14 16:50:59,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-14 16:50:59,955 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-14 16:50:59,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276238597] [2024-10-14 16:50:59,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [276238597] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-14 16:50:59,956 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-14 16:50:59,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-10-14 16:50:59,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424835045] [2024-10-14 16:50:59,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-14 16:50:59,967 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-10-14 16:50:59,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-14 16:51:00,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-10-14 16:51:00,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-10-14 16:51:00,006 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 110 out of 430 [2024-10-14 16:51:00,010 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 436 places, 426 transitions, 864 flow. Second operand has 2 states, 2 states have (on average 111.0) internal successors, (222), 2 states have internal predecessors, (222), 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) [2024-10-14 16:51:00,011 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-14 16:51:00,011 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 110 of 430 [2024-10-14 16:51:00,012 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-14 16:51:09,669 INFO L124 PetriNetUnfolderBase]: 5748/16357 cut-off events. [2024-10-14 16:51:09,670 INFO L125 PetriNetUnfolderBase]: For 101/101 co-relation queries the response was YES. [2024-10-14 16:51:09,743 INFO L83 FinitePrefix]: Finished finitePrefix Result has 24333 conditions, 16357 events. 5748/16357 cut-off events. For 101/101 co-relation queries the response was YES. Maximal size of possible extension queue 678. Compared 190810 event pairs, 5748 based on Foata normal form. 1391/16633 useless extension candidates. Maximal degree in co-relation 24279. Up to 7769 conditions per place. [2024-10-14 16:51:09,834 INFO L140 encePairwiseOnDemand]: 133/430 looper letters, 22 selfloop transitions, 0 changer transitions 0/127 dead transitions. [2024-10-14 16:51:09,835 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 141 places, 127 transitions, 310 flow [2024-10-14 16:51:09,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-10-14 16:51:09,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2 states. [2024-10-14 16:51:09,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2 states to 2 states and 539 transitions. [2024-10-14 16:51:09,853 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.6267441860465116 [2024-10-14 16:51:09,855 INFO L175 Difference]: Start difference. First operand has 436 places, 426 transitions, 864 flow. Second operand 2 states and 539 transitions. [2024-10-14 16:51:09,856 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 141 places, 127 transitions, 310 flow [2024-10-14 16:51:09,859 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 137 places, 127 transitions, 306 flow, removed 0 selfloop flow, removed 4 redundant places. [2024-10-14 16:51:09,862 INFO L231 Difference]: Finished difference. Result has 137 places, 127 transitions, 262 flow [2024-10-14 16:51:09,864 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=430, PETRI_DIFFERENCE_MINUEND_FLOW=262, PETRI_DIFFERENCE_MINUEND_PLACES=136, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=127, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=127, PETRI_DIFFERENCE_SUBTRAHEND_STATES=2, PETRI_FLOW=262, PETRI_PLACES=137, PETRI_TRANSITIONS=127} [2024-10-14 16:51:09,870 INFO L277 CegarLoopForPetriNet]: 436 programPoint places, -299 predicate places. [2024-10-14 16:51:09,871 INFO L471 AbstractCegarLoop]: Abstraction has has 137 places, 127 transitions, 262 flow [2024-10-14 16:51:09,871 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 111.0) internal successors, (222), 2 states have internal predecessors, (222), 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) [2024-10-14 16:51:09,871 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-14 16:51:09,871 INFO L204 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-14 16:51:09,872 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-10-14 16:51:09,872 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 553 more)] === [2024-10-14 16:51:09,872 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-14 16:51:09,872 INFO L85 PathProgramCache]: Analyzing trace with hash -740402280, now seen corresponding path program 1 times [2024-10-14 16:51:09,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-14 16:51:09,873 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186315467] [2024-10-14 16:51:09,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-14 16:51:09,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-14 16:51:09,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-14 16:51:10,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-14 16:51:10,066 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-14 16:51:10,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186315467] [2024-10-14 16:51:10,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186315467] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-14 16:51:10,067 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-14 16:51:10,067 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-14 16:51:10,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732957346] [2024-10-14 16:51:10,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-14 16:51:10,068 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-14 16:51:10,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-14 16:51:10,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-14 16:51:10,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-14 16:51:10,077 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 430 [2024-10-14 16:51:10,078 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 137 places, 127 transitions, 262 flow. Second operand has 3 states, 3 states have (on average 109.33333333333333) internal successors, (328), 3 states have internal predecessors, (328), 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) [2024-10-14 16:51:10,079 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-14 16:51:10,079 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 430 [2024-10-14 16:51:10,079 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-10-14 16:51:21,276 INFO L124 PetriNetUnfolderBase]: 8756/23452 cut-off events. [2024-10-14 16:51:21,277 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2024-10-14 16:51:21,341 INFO L83 FinitePrefix]: Finished finitePrefix Result has 35393 conditions, 23452 events. 8756/23452 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 681. Compared 268096 event pairs, 2740 based on Foata normal form. 0/21970 useless extension candidates. Maximal degree in co-relation 35390. Up to 7936 conditions per place. [2024-10-14 16:51:21,431 INFO L140 encePairwiseOnDemand]: 428/430 looper letters, 38 selfloop transitions, 1 changer transitions 0/141 dead transitions. [2024-10-14 16:51:21,431 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 138 places, 141 transitions, 368 flow [2024-10-14 16:51:21,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-14 16:51:21,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-10-14 16:51:21,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 361 transitions. [2024-10-14 16:51:21,435 INFO L512 CegarLoopForPetriNet]: DFA transition density 0.27984496124031005 [2024-10-14 16:51:21,435 INFO L175 Difference]: Start difference. First operand has 137 places, 127 transitions, 262 flow. Second operand 3 states and 361 transitions. [2024-10-14 16:51:21,435 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 138 places, 141 transitions, 368 flow [2024-10-14 16:51:21,436 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 138 places, 141 transitions, 368 flow, removed 0 selfloop flow, removed 0 redundant places. [2024-10-14 16:51:21,439 INFO L231 Difference]: Finished difference. Result has 138 places, 126 transitions, 262 flow [2024-10-14 16:51:21,439 INFO L260 CegarLoopForPetriNet]: {PETRI_ALPHABET=430, PETRI_DIFFERENCE_MINUEND_FLOW=260, PETRI_DIFFERENCE_MINUEND_PLACES=136, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=126, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=125, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=262, PETRI_PLACES=138, PETRI_TRANSITIONS=126} [2024-10-14 16:51:21,440 INFO L277 CegarLoopForPetriNet]: 436 programPoint places, -298 predicate places. [2024-10-14 16:51:21,440 INFO L471 AbstractCegarLoop]: Abstraction has has 138 places, 126 transitions, 262 flow [2024-10-14 16:51:21,441 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 109.33333333333333) internal successors, (328), 3 states have internal predecessors, (328), 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) [2024-10-14 16:51:21,441 INFO L196 CegarLoopForPetriNet]: Found error trace [2024-10-14 16:51:21,441 INFO L204 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-14 16:51:21,441 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-10-14 16:51:21,442 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr38ASSERT_VIOLATIONDATA_RACE === [P0Err0ASSERT_VIOLATIONDATA_RACE, P0Err1ASSERT_VIOLATIONDATA_RACE, P0Err2ASSERT_VIOLATIONDATA_RACE, P0Err3ASSERT_VIOLATIONDATA_RACE (and 553 more)] === [2024-10-14 16:51:21,442 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-14 16:51:21,442 INFO L85 PathProgramCache]: Analyzing trace with hash -1553516993, now seen corresponding path program 1 times [2024-10-14 16:51:21,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-14 16:51:21,443 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706293448] [2024-10-14 16:51:21,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-14 16:51:21,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-14 16:51:21,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-14 16:51:21,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-14 16:51:21,607 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-14 16:51:21,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706293448] [2024-10-14 16:51:21,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1706293448] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-14 16:51:21,607 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-14 16:51:21,607 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-14 16:51:21,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385948357] [2024-10-14 16:51:21,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-14 16:51:21,608 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-14 16:51:21,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-14 16:51:21,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-14 16:51:21,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-14 16:51:21,613 INFO L467 CegarLoopForPetriNet]: Number of universal loopers: 107 out of 430 [2024-10-14 16:51:21,614 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 138 places, 126 transitions, 262 flow. Second operand has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 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) [2024-10-14 16:51:21,617 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-10-14 16:51:21,617 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 107 of 430 [2024-10-14 16:51:21,617 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand