./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Ackermann03.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:56:09,478 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:56:09,586 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Overflow-32bit-Taipan_Default.epf [2023-11-24 23:56:09,593 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:56:09,594 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:56:09,623 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:56:09,623 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:56:09,624 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:56:09,625 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:56:09,626 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:56:09,626 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:56:09,627 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:56:09,628 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:56:09,628 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:56:09,629 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:56:09,630 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:56:09,630 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:56:09,631 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:56:09,631 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:56:09,632 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:56:09,633 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:56:09,634 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:56:09,635 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:56:09,635 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:56:09,636 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:56:09,636 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:56:09,637 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:56:09,638 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:56:09,638 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:56:09,639 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:56:09,639 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:56:09,640 INFO L153 SettingsManager]: * Check absence of signed integer overflows=true [2023-11-24 23:56:09,640 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-24 23:56:09,641 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:56:09,641 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:56:09,641 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:56:09,642 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:56:09,642 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:56:09,642 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:56:09,643 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:56:09,643 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:56:09,644 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:56:09,644 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:56:09,644 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:56:09,645 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:56:09,645 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:56:09,645 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:56:09,645 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:56:09,646 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:56:09,646 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd [2023-11-24 23:56:10,012 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:56:10,057 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:56:10,061 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:56:10,062 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:56:10,063 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:56:10,065 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/recursive/Ackermann03.c [2023-11-24 23:56:13,769 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:56:14,038 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:56:14,039 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/sv-benchmarks/c/recursive/Ackermann03.c [2023-11-24 23:56:14,049 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/data/0a2426ee8/9c4a23df055442158a0b39e9057d8648/FLAGd13d86421 [2023-11-24 23:56:14,069 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/data/0a2426ee8/9c4a23df055442158a0b39e9057d8648 [2023-11-24 23:56:14,079 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:56:14,082 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:56:14,088 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:56:14,088 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:56:14,095 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:56:14,096 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,098 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13e8923 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14, skipping insertion in model container [2023-11-24 23:56:14,098 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,130 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:56:14,321 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:56:14,335 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:56:14,356 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:56:14,377 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:56:14,378 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14 WrapperNode [2023-11-24 23:56:14,383 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:56:14,385 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:56:14,386 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:56:14,386 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:56:14,395 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,403 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,420 INFO L138 Inliner]: procedures = 13, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 34 [2023-11-24 23:56:14,421 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:56:14,421 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:56:14,422 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:56:14,422 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:56:14,431 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,432 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,433 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,434 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,438 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,440 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,442 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,443 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,445 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:56:14,447 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:56:14,447 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:56:14,447 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:56:14,448 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (1/1) ... [2023-11-24 23:56:14,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:56:14,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:14,491 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:56:14,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:56:14,539 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:56:14,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:56:14,539 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:56:14,539 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2023-11-24 23:56:14,540 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2023-11-24 23:56:14,540 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:56:14,611 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:56:14,613 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:56:14,803 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:56:14,839 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:56:14,840 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-24 23:56:14,842 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:56:14 BoogieIcfgContainer [2023-11-24 23:56:14,842 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:56:14,846 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:56:14,846 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:56:14,850 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:56:14,851 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:56:14" (1/3) ... [2023-11-24 23:56:14,852 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b11ef7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:56:14, skipping insertion in model container [2023-11-24 23:56:14,852 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:56:14" (2/3) ... [2023-11-24 23:56:14,853 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b11ef7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:56:14, skipping insertion in model container [2023-11-24 23:56:14,853 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:56:14" (3/3) ... [2023-11-24 23:56:14,855 INFO L112 eAbstractionObserver]: Analyzing ICFG Ackermann03.c [2023-11-24 23:56:14,878 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:56:14,879 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2023-11-24 23:56:15,013 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:56:15,020 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@72d107bd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:56:15,020 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-11-24 23:56:15,024 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 20 states have (on average 1.6) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-24 23:56:15,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-24 23:56:15,031 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:15,031 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:15,032 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:15,037 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:15,037 INFO L85 PathProgramCache]: Analyzing trace with hash -2118177911, now seen corresponding path program 1 times [2023-11-24 23:56:15,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:15,047 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654947541] [2023-11-24 23:56:15,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:15,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:15,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:15,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:15,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:15,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654947541] [2023-11-24 23:56:15,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654947541] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:56:15,405 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:56:15,405 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:56:15,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129413362] [2023-11-24 23:56:15,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:56:15,413 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:56:15,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:15,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:56:15,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:56:15,472 INFO L87 Difference]: Start difference. First operand has 34 states, 20 states have (on average 1.6) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:15,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:15,662 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2023-11-24 23:56:15,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:56:15,665 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-24 23:56:15,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:15,676 INFO L225 Difference]: With dead ends: 64 [2023-11-24 23:56:15,676 INFO L226 Difference]: Without dead ends: 58 [2023-11-24 23:56:15,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:56:15,684 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 50 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:15,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 101 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:56:15,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-24 23:56:15,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2023-11-24 23:56:15,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 41 states have internal predecessors, (51), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-24 23:56:15,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2023-11-24 23:56:15,748 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 7 [2023-11-24 23:56:15,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:15,749 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2023-11-24 23:56:15,749 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:15,749 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2023-11-24 23:56:15,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-24 23:56:15,750 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:15,750 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:15,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:56:15,751 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:15,752 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:15,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1239000740, now seen corresponding path program 1 times [2023-11-24 23:56:15,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:15,753 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501916676] [2023-11-24 23:56:15,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:15,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:15,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:15,842 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:15,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:15,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501916676] [2023-11-24 23:56:15,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501916676] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:56:15,844 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:56:15,844 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:56:15,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158266469] [2023-11-24 23:56:15,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:56:15,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:56:15,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:15,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:56:15,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:56:15,847 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:15,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:15,982 INFO L93 Difference]: Finished difference Result 100 states and 136 transitions. [2023-11-24 23:56:15,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:56:15,986 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-24 23:56:15,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:15,991 INFO L225 Difference]: With dead ends: 100 [2023-11-24 23:56:15,991 INFO L226 Difference]: Without dead ends: 94 [2023-11-24 23:56:15,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:56:15,994 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 48 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:15,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 92 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:56:15,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-11-24 23:56:16,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2023-11-24 23:56:16,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 60 states have (on average 1.5166666666666666) internal successors, (91), 69 states have internal predecessors, (91), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-24 23:56:16,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 114 transitions. [2023-11-24 23:56:16,034 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 114 transitions. Word has length 8 [2023-11-24 23:56:16,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:16,034 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 114 transitions. [2023-11-24 23:56:16,035 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:16,035 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 114 transitions. [2023-11-24 23:56:16,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-24 23:56:16,035 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:16,036 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:16,036 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:56:16,036 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:16,037 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:16,037 INFO L85 PathProgramCache]: Analyzing trace with hash -1239005737, now seen corresponding path program 1 times [2023-11-24 23:56:16,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:16,038 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30127302] [2023-11-24 23:56:16,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:16,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:16,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:16,169 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:16,169 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:16,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30127302] [2023-11-24 23:56:16,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30127302] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:56:16,170 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:56:16,170 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:56:16,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055169656] [2023-11-24 23:56:16,171 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:56:16,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:56:16,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:16,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:56:16,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:56:16,173 INFO L87 Difference]: Start difference. First operand 84 states and 114 transitions. Second operand has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:16,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:16,282 INFO L93 Difference]: Finished difference Result 113 states and 151 transitions. [2023-11-24 23:56:16,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:56:16,283 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-24 23:56:16,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:16,285 INFO L225 Difference]: With dead ends: 113 [2023-11-24 23:56:16,286 INFO L226 Difference]: Without dead ends: 109 [2023-11-24 23:56:16,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:56:16,288 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 49 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:16,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 86 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:56:16,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-11-24 23:56:16,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 101. [2023-11-24 23:56:16,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 73 states have (on average 1.452054794520548) internal successors, (106), 82 states have internal predecessors, (106), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-24 23:56:16,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 135 transitions. [2023-11-24 23:56:16,313 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 135 transitions. Word has length 8 [2023-11-24 23:56:16,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:16,314 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 135 transitions. [2023-11-24 23:56:16,314 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:16,314 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 135 transitions. [2023-11-24 23:56:16,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-24 23:56:16,315 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:16,315 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:16,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-24 23:56:16,316 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:16,316 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:16,317 INFO L85 PathProgramCache]: Analyzing trace with hash 245682796, now seen corresponding path program 1 times [2023-11-24 23:56:16,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:16,317 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922794806] [2023-11-24 23:56:16,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:16,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:16,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:16,387 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:16,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:16,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922794806] [2023-11-24 23:56:16,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922794806] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:56:16,389 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:56:16,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:56:16,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188122829] [2023-11-24 23:56:16,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:56:16,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:56:16,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:16,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:56:16,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:56:16,391 INFO L87 Difference]: Start difference. First operand 101 states and 135 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:16,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:16,464 INFO L93 Difference]: Finished difference Result 101 states and 135 transitions. [2023-11-24 23:56:16,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:56:16,465 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-24 23:56:16,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:16,470 INFO L225 Difference]: With dead ends: 101 [2023-11-24 23:56:16,471 INFO L226 Difference]: Without dead ends: 99 [2023-11-24 23:56:16,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:56:16,483 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 42 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:16,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 40 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:56:16,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-24 23:56:16,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-24 23:56:16,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 73 states have (on average 1.3150684931506849) internal successors, (96), 80 states have internal predecessors, (96), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-24 23:56:16,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 125 transitions. [2023-11-24 23:56:16,524 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 125 transitions. Word has length 9 [2023-11-24 23:56:16,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:16,524 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 125 transitions. [2023-11-24 23:56:16,525 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:16,525 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 125 transitions. [2023-11-24 23:56:16,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 23:56:16,526 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:16,526 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:16,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-24 23:56:16,527 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:16,528 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:16,529 INFO L85 PathProgramCache]: Analyzing trace with hash -1896410727, now seen corresponding path program 1 times [2023-11-24 23:56:16,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:16,530 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134567023] [2023-11-24 23:56:16,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:16,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:16,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:16,611 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:16,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:16,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134567023] [2023-11-24 23:56:16,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134567023] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:56:16,615 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:56:16,615 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 23:56:16,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881435240] [2023-11-24 23:56:16,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:56:16,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:56:16,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:16,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:56:16,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 23:56:16,620 INFO L87 Difference]: Start difference. First operand 99 states and 125 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:16,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:16,694 INFO L93 Difference]: Finished difference Result 167 states and 220 transitions. [2023-11-24 23:56:16,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:56:16,695 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-24 23:56:16,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:16,696 INFO L225 Difference]: With dead ends: 167 [2023-11-24 23:56:16,697 INFO L226 Difference]: Without dead ends: 96 [2023-11-24 23:56:16,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:56:16,701 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 26 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:16,701 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 82 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:56:16,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-11-24 23:56:16,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2023-11-24 23:56:16,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 70 states have (on average 1.3) internal successors, (91), 77 states have internal predecessors, (91), 15 states have call successors, (15), 5 states have call predecessors, (15), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-24 23:56:16,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 118 transitions. [2023-11-24 23:56:16,720 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 118 transitions. Word has length 14 [2023-11-24 23:56:16,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:16,721 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 118 transitions. [2023-11-24 23:56:16,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:16,722 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 118 transitions. [2023-11-24 23:56:16,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 23:56:16,723 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:16,723 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:16,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-24 23:56:16,723 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:16,724 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:16,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1896410503, now seen corresponding path program 1 times [2023-11-24 23:56:16,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:16,725 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881159841] [2023-11-24 23:56:16,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:16,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:16,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:16,848 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:16,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:16,849 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881159841] [2023-11-24 23:56:16,849 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [881159841] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:16,849 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571269156] [2023-11-24 23:56:16,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:16,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:16,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:16,854 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:16,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:56:16,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:16,921 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-24 23:56:16,928 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:17,023 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:17,023 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:17,157 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:17,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571269156] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:17,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1686789791] [2023-11-24 23:56:17,185 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-24 23:56:17,186 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:17,192 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:17,197 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:17,198 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-11-24 23:56:17,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605626615] [2023-11-24 23:56:17,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:17,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-24 23:56:17,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:17,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-24 23:56:17,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-24 23:56:17,208 INFO L87 Difference]: Start difference. First operand 95 states and 118 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:17,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:17,591 INFO L93 Difference]: Finished difference Result 273 states and 355 transitions. [2023-11-24 23:56:17,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-24 23:56:17,592 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-24 23:56:17,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:17,597 INFO L225 Difference]: With dead ends: 273 [2023-11-24 23:56:17,597 INFO L226 Difference]: Without dead ends: 271 [2023-11-24 23:56:17,598 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-11-24 23:56:17,599 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 308 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:17,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 175 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:56:17,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2023-11-24 23:56:17,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2023-11-24 23:56:17,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 181 states have (on average 1.2651933701657458) internal successors, (229), 188 states have internal predecessors, (229), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2023-11-24 23:56:17,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 298 transitions. [2023-11-24 23:56:17,672 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 298 transitions. Word has length 14 [2023-11-24 23:56:17,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:17,672 INFO L495 AbstractCegarLoop]: Abstraction has 235 states and 298 transitions. [2023-11-24 23:56:17,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:17,673 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 298 transitions. [2023-11-24 23:56:17,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-24 23:56:17,674 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:17,674 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:17,681 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-24 23:56:17,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:17,880 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:17,880 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:17,880 INFO L85 PathProgramCache]: Analyzing trace with hash -1750564749, now seen corresponding path program 1 times [2023-11-24 23:56:17,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:17,880 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477009424] [2023-11-24 23:56:17,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:17,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:17,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:18,016 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:18,016 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:18,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477009424] [2023-11-24 23:56:18,017 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477009424] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:18,017 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746041710] [2023-11-24 23:56:18,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:18,017 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:18,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:18,018 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:18,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:56:18,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:18,060 INFO L262 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:56:18,062 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:18,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:18,106 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:56:18,107 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746041710] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:56:18,107 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:56:18,107 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 9 [2023-11-24 23:56:18,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062267850] [2023-11-24 23:56:18,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:56:18,108 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:56:18,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:18,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:56:18,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:56:18,109 INFO L87 Difference]: Start difference. First operand 235 states and 298 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:18,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:18,234 INFO L93 Difference]: Finished difference Result 327 states and 436 transitions. [2023-11-24 23:56:18,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:56:18,235 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-24 23:56:18,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:18,239 INFO L225 Difference]: With dead ends: 327 [2023-11-24 23:56:18,239 INFO L226 Difference]: Without dead ends: 326 [2023-11-24 23:56:18,240 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2023-11-24 23:56:18,241 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 51 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:18,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 79 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:56:18,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2023-11-24 23:56:18,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 292. [2023-11-24 23:56:18,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 226 states have (on average 1.261061946902655) internal successors, (285), 233 states have internal predecessors, (285), 45 states have call successors, (45), 16 states have call predecessors, (45), 15 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2023-11-24 23:56:18,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 372 transitions. [2023-11-24 23:56:18,287 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 372 transitions. Word has length 15 [2023-11-24 23:56:18,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:18,288 INFO L495 AbstractCegarLoop]: Abstraction has 292 states and 372 transitions. [2023-11-24 23:56:18,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:18,308 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 372 transitions. [2023-11-24 23:56:18,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-24 23:56:18,310 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:18,310 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:18,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:18,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:18,516 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:18,517 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:18,517 INFO L85 PathProgramCache]: Analyzing trace with hash -1576448012, now seen corresponding path program 1 times [2023-11-24 23:56:18,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:18,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650589146] [2023-11-24 23:56:18,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:18,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:18,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:18,631 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:18,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:18,631 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650589146] [2023-11-24 23:56:18,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650589146] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:18,633 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639729924] [2023-11-24 23:56:18,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:18,633 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:18,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:18,635 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:18,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:56:18,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:18,687 INFO L262 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-24 23:56:18,688 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:18,734 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:18,734 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:18,839 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:18,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639729924] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:18,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1651273058] [2023-11-24 23:56:18,844 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-24 23:56:18,846 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:18,847 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:18,849 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:18,850 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-11-24 23:56:18,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784792608] [2023-11-24 23:56:18,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:18,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-24 23:56:18,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:18,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-24 23:56:18,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-24 23:56:18,861 INFO L87 Difference]: Start difference. First operand 292 states and 372 transitions. Second operand has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:19,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:19,196 INFO L93 Difference]: Finished difference Result 590 states and 791 transitions. [2023-11-24 23:56:19,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-24 23:56:19,197 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-24 23:56:19,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:19,206 INFO L225 Difference]: With dead ends: 590 [2023-11-24 23:56:19,206 INFO L226 Difference]: Without dead ends: 589 [2023-11-24 23:56:19,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-11-24 23:56:19,208 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 156 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:19,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 166 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:56:19,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2023-11-24 23:56:19,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 520. [2023-11-24 23:56:19,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 406 states have (on average 1.2044334975369457) internal successors, (489), 413 states have internal predecessors, (489), 81 states have call successors, (81), 28 states have call predecessors, (81), 27 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-11-24 23:56:19,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 648 transitions. [2023-11-24 23:56:19,297 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 648 transitions. Word has length 18 [2023-11-24 23:56:19,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:19,297 INFO L495 AbstractCegarLoop]: Abstraction has 520 states and 648 transitions. [2023-11-24 23:56:19,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:19,298 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 648 transitions. [2023-11-24 23:56:19,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-24 23:56:19,303 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:19,303 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:19,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:19,509 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:19,509 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:19,510 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:19,510 INFO L85 PathProgramCache]: Analyzing trace with hash 244799614, now seen corresponding path program 1 times [2023-11-24 23:56:19,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:19,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115735110] [2023-11-24 23:56:19,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:19,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:19,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:19,628 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:56:19,628 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:19,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115735110] [2023-11-24 23:56:19,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115735110] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:19,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660859347] [2023-11-24 23:56:19,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:19,629 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:19,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:19,630 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:19,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:56:19,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:19,693 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:56:19,696 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:19,759 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:56:19,759 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:56:19,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660859347] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:56:19,759 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:56:19,760 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 10 [2023-11-24 23:56:19,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205588358] [2023-11-24 23:56:19,760 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:56:19,760 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:56:19,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:19,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:56:19,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-11-24 23:56:19,762 INFO L87 Difference]: Start difference. First operand 520 states and 648 transitions. Second operand has 5 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 23:56:19,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:19,949 INFO L93 Difference]: Finished difference Result 561 states and 695 transitions. [2023-11-24 23:56:19,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-24 23:56:19,950 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2023-11-24 23:56:19,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:19,955 INFO L225 Difference]: With dead ends: 561 [2023-11-24 23:56:19,956 INFO L226 Difference]: Without dead ends: 560 [2023-11-24 23:56:19,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2023-11-24 23:56:19,959 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 43 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:19,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 97 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:56:19,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2023-11-24 23:56:20,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 519. [2023-11-24 23:56:20,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 519 states, 406 states have (on average 1.1945812807881773) internal successors, (485), 412 states have internal predecessors, (485), 81 states have call successors, (81), 28 states have call predecessors, (81), 27 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-11-24 23:56:20,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 519 states to 519 states and 644 transitions. [2023-11-24 23:56:20,053 INFO L78 Accepts]: Start accepts. Automaton has 519 states and 644 transitions. Word has length 23 [2023-11-24 23:56:20,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:20,053 INFO L495 AbstractCegarLoop]: Abstraction has 519 states and 644 transitions. [2023-11-24 23:56:20,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 23:56:20,054 INFO L276 IsEmpty]: Start isEmpty. Operand 519 states and 644 transitions. [2023-11-24 23:56:20,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-24 23:56:20,059 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:20,059 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:20,069 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-24 23:56:20,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:20,264 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:20,265 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:20,265 INFO L85 PathProgramCache]: Analyzing trace with hash -1001146494, now seen corresponding path program 1 times [2023-11-24 23:56:20,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:20,265 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630794134] [2023-11-24 23:56:20,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:20,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:20,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:20,368 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:56:20,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:20,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630794134] [2023-11-24 23:56:20,368 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630794134] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:20,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055103364] [2023-11-24 23:56:20,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:20,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:20,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:20,370 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:20,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:56:20,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:20,431 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-24 23:56:20,433 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:20,482 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:56:20,482 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:20,665 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:56:20,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2055103364] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:20,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [688454000] [2023-11-24 23:56:20,668 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-24 23:56:20,668 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:20,669 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:20,670 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:20,670 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-11-24 23:56:20,671 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282180391] [2023-11-24 23:56:20,671 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:20,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-24 23:56:20,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:20,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-24 23:56:20,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2023-11-24 23:56:20,673 INFO L87 Difference]: Start difference. First operand 519 states and 644 transitions. Second operand has 14 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:56:20,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:20,982 INFO L93 Difference]: Finished difference Result 822 states and 1146 transitions. [2023-11-24 23:56:20,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-24 23:56:20,983 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2023-11-24 23:56:20,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:20,990 INFO L225 Difference]: With dead ends: 822 [2023-11-24 23:56:20,991 INFO L226 Difference]: Without dead ends: 820 [2023-11-24 23:56:20,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2023-11-24 23:56:20,992 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 140 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:20,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 101 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:56:20,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 820 states. [2023-11-24 23:56:21,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 820 to 746. [2023-11-24 23:56:21,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 746 states, 558 states have (on average 1.1827956989247312) internal successors, (660), 583 states have internal predecessors, (660), 130 states have call successors, (130), 35 states have call predecessors, (130), 53 states have return successors, (154), 127 states have call predecessors, (154), 126 states have call successors, (154) [2023-11-24 23:56:21,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 746 states to 746 states and 944 transitions. [2023-11-24 23:56:21,098 INFO L78 Accepts]: Start accepts. Automaton has 746 states and 944 transitions. Word has length 24 [2023-11-24 23:56:21,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:21,098 INFO L495 AbstractCegarLoop]: Abstraction has 746 states and 944 transitions. [2023-11-24 23:56:21,098 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:56:21,099 INFO L276 IsEmpty]: Start isEmpty. Operand 746 states and 944 transitions. [2023-11-24 23:56:21,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-24 23:56:21,100 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:21,100 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:21,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:21,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-24 23:56:21,305 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:21,305 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:21,305 INFO L85 PathProgramCache]: Analyzing trace with hash -24086519, now seen corresponding path program 1 times [2023-11-24 23:56:21,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:21,306 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711917866] [2023-11-24 23:56:21,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:21,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:21,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:21,443 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:56:21,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:21,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711917866] [2023-11-24 23:56:21,444 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1711917866] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:21,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368100950] [2023-11-24 23:56:21,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:21,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:21,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:21,446 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:21,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:56:21,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:21,502 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-24 23:56:21,503 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:21,580 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:56:21,580 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:21,733 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:56:21,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368100950] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:21,734 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:56:21,734 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 12 [2023-11-24 23:56:21,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244754988] [2023-11-24 23:56:21,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:56:21,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:56:21,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:21,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:56:21,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2023-11-24 23:56:21,736 INFO L87 Difference]: Start difference. First operand 746 states and 944 transitions. Second operand has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 23:56:22,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:22,058 INFO L93 Difference]: Finished difference Result 901 states and 1226 transitions. [2023-11-24 23:56:22,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-24 23:56:22,058 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2023-11-24 23:56:22,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:22,066 INFO L225 Difference]: With dead ends: 901 [2023-11-24 23:56:22,066 INFO L226 Difference]: Without dead ends: 900 [2023-11-24 23:56:22,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:56:22,068 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 51 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:22,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 99 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:56:22,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2023-11-24 23:56:22,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 829. [2023-11-24 23:56:22,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 829 states, 616 states have (on average 1.1818181818181819) internal successors, (728), 644 states have internal predecessors, (728), 149 states have call successors, (149), 38 states have call predecessors, (149), 59 states have return successors, (183), 146 states have call predecessors, (183), 145 states have call successors, (183) [2023-11-24 23:56:22,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1060 transitions. [2023-11-24 23:56:22,168 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1060 transitions. Word has length 26 [2023-11-24 23:56:22,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:22,169 INFO L495 AbstractCegarLoop]: Abstraction has 829 states and 1060 transitions. [2023-11-24 23:56:22,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 23:56:22,169 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1060 transitions. [2023-11-24 23:56:22,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-24 23:56:22,171 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:22,171 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:22,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:22,381 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:22,381 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:22,381 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:22,382 INFO L85 PathProgramCache]: Analyzing trace with hash -1210732047, now seen corresponding path program 1 times [2023-11-24 23:56:22,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:22,382 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537989047] [2023-11-24 23:56:22,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:22,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:22,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:22,585 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:56:22,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:22,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537989047] [2023-11-24 23:56:22,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537989047] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:22,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731887058] [2023-11-24 23:56:22,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:22,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:22,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:22,588 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:22,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-24 23:56:22,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:22,653 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-24 23:56:22,658 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:22,719 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:56:22,719 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:22,976 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:56:22,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731887058] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:23,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2015878111] [2023-11-24 23:56:23,009 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-24 23:56:23,009 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:23,009 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:23,010 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:23,010 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2023-11-24 23:56:23,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804890943] [2023-11-24 23:56:23,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:23,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-24 23:56:23,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:23,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-24 23:56:23,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:56:23,012 INFO L87 Difference]: Start difference. First operand 829 states and 1060 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-24 23:56:23,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:23,687 INFO L93 Difference]: Finished difference Result 1544 states and 2534 transitions. [2023-11-24 23:56:23,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-24 23:56:23,688 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) Word has length 33 [2023-11-24 23:56:23,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:23,703 INFO L225 Difference]: With dead ends: 1544 [2023-11-24 23:56:23,703 INFO L226 Difference]: Without dead ends: 1542 [2023-11-24 23:56:23,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=190, Invalid=680, Unknown=0, NotChecked=0, Total=870 [2023-11-24 23:56:23,707 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 129 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:23,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 162 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:56:23,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1542 states. [2023-11-24 23:56:23,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1542 to 1294. [2023-11-24 23:56:23,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1294 states, 927 states have (on average 1.1661272923408845) internal successors, (1081), 974 states have internal predecessors, (1081), 247 states have call successors, (247), 53 states have call predecessors, (247), 115 states have return successors, (548), 266 states have call predecessors, (548), 242 states have call successors, (548) [2023-11-24 23:56:23,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1294 states to 1294 states and 1876 transitions. [2023-11-24 23:56:23,951 INFO L78 Accepts]: Start accepts. Automaton has 1294 states and 1876 transitions. Word has length 33 [2023-11-24 23:56:23,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:23,952 INFO L495 AbstractCegarLoop]: Abstraction has 1294 states and 1876 transitions. [2023-11-24 23:56:23,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-24 23:56:23,952 INFO L276 IsEmpty]: Start isEmpty. Operand 1294 states and 1876 transitions. [2023-11-24 23:56:23,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-24 23:56:23,954 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:23,954 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:23,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:24,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-24 23:56:24,165 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:24,165 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:24,165 INFO L85 PathProgramCache]: Analyzing trace with hash 60876767, now seen corresponding path program 2 times [2023-11-24 23:56:24,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:24,166 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238767521] [2023-11-24 23:56:24,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:24,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:24,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:24,330 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:56:24,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:24,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238767521] [2023-11-24 23:56:24,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238767521] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:24,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785396062] [2023-11-24 23:56:24,331 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:56:24,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:24,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:24,333 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:24,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-24 23:56:24,397 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-24 23:56:24,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:56:24,398 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-24 23:56:24,400 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:24,456 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:56:24,457 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:24,663 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:56:24,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785396062] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:24,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [899721855] [2023-11-24 23:56:24,666 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-24 23:56:24,667 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:24,667 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:24,668 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:24,668 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2023-11-24 23:56:24,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371664531] [2023-11-24 23:56:24,669 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:24,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-24 23:56:24,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:24,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-24 23:56:24,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:56:24,671 INFO L87 Difference]: Start difference. First operand 1294 states and 1876 transitions. Second operand has 18 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:56:25,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:25,502 INFO L93 Difference]: Finished difference Result 2153 states and 3287 transitions. [2023-11-24 23:56:25,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-24 23:56:25,503 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2023-11-24 23:56:25,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:25,525 INFO L225 Difference]: With dead ends: 2153 [2023-11-24 23:56:25,526 INFO L226 Difference]: Without dead ends: 2119 [2023-11-24 23:56:25,531 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=303, Invalid=957, Unknown=0, NotChecked=0, Total=1260 [2023-11-24 23:56:25,532 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 432 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 432 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:25,533 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [432 Valid, 148 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:56:25,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2023-11-24 23:56:25,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1967. [2023-11-24 23:56:25,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1967 states, 1408 states have (on average 1.1519886363636365) internal successors, (1622), 1484 states have internal predecessors, (1622), 376 states have call successors, (376), 82 states have call predecessors, (376), 178 states have return successors, (845), 400 states have call predecessors, (845), 361 states have call successors, (845) [2023-11-24 23:56:25,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1967 states to 1967 states and 2843 transitions. [2023-11-24 23:56:25,840 INFO L78 Accepts]: Start accepts. Automaton has 1967 states and 2843 transitions. Word has length 34 [2023-11-24 23:56:25,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:25,842 INFO L495 AbstractCegarLoop]: Abstraction has 1967 states and 2843 transitions. [2023-11-24 23:56:25,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:56:25,842 INFO L276 IsEmpty]: Start isEmpty. Operand 1967 states and 2843 transitions. [2023-11-24 23:56:25,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-24 23:56:25,844 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:25,845 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:25,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:26,050 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-24 23:56:26,050 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:26,051 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:26,051 INFO L85 PathProgramCache]: Analyzing trace with hash 427659960, now seen corresponding path program 1 times [2023-11-24 23:56:26,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:26,051 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053547746] [2023-11-24 23:56:26,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:26,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:26,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:26,182 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:56:26,182 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:26,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053547746] [2023-11-24 23:56:26,183 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1053547746] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:26,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893001254] [2023-11-24 23:56:26,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:26,183 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:26,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:26,185 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:26,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-24 23:56:26,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:26,254 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-24 23:56:26,256 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:26,353 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:56:26,353 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:26,624 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:56:26,625 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893001254] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:26,625 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:56:26,625 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 17 [2023-11-24 23:56:26,625 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236013794] [2023-11-24 23:56:26,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:56:26,626 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-24 23:56:26,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:26,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-24 23:56:26,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:56:26,628 INFO L87 Difference]: Start difference. First operand 1967 states and 2843 transitions. Second operand has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-24 23:56:27,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:27,177 INFO L93 Difference]: Finished difference Result 2199 states and 3486 transitions. [2023-11-24 23:56:27,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-24 23:56:27,178 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2023-11-24 23:56:27,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:27,200 INFO L225 Difference]: With dead ends: 2199 [2023-11-24 23:56:27,201 INFO L226 Difference]: Without dead ends: 2198 [2023-11-24 23:56:27,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2023-11-24 23:56:27,204 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 65 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:27,204 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 154 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:56:27,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2198 states. [2023-11-24 23:56:27,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2198 to 1975. [2023-11-24 23:56:27,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1975 states, 1416 states have (on average 1.1490112994350283) internal successors, (1627), 1488 states have internal predecessors, (1627), 380 states have call successors, (380), 82 states have call predecessors, (380), 174 states have return successors, (699), 404 states have call predecessors, (699), 365 states have call successors, (699) [2023-11-24 23:56:27,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1975 states to 1975 states and 2706 transitions. [2023-11-24 23:56:27,561 INFO L78 Accepts]: Start accepts. Automaton has 1975 states and 2706 transitions. Word has length 35 [2023-11-24 23:56:27,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:27,562 INFO L495 AbstractCegarLoop]: Abstraction has 1975 states and 2706 transitions. [2023-11-24 23:56:27,562 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-24 23:56:27,562 INFO L276 IsEmpty]: Start isEmpty. Operand 1975 states and 2706 transitions. [2023-11-24 23:56:27,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-24 23:56:27,565 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:27,565 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1] [2023-11-24 23:56:27,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:27,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-24 23:56:27,771 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:27,772 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:27,772 INFO L85 PathProgramCache]: Analyzing trace with hash 886287478, now seen corresponding path program 2 times [2023-11-24 23:56:27,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:27,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132871232] [2023-11-24 23:56:27,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:27,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:27,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:27,945 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:27,945 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:27,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132871232] [2023-11-24 23:56:27,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132871232] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:27,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471778820] [2023-11-24 23:56:27,946 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:56:27,946 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:27,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:27,947 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:27,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-24 23:56:28,013 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-24 23:56:28,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:56:28,014 INFO L262 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-24 23:56:28,016 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:28,117 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:28,118 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:28,349 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:56:28,350 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471778820] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:28,350 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [414560633] [2023-11-24 23:56:28,352 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-24 23:56:28,352 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:28,352 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:28,353 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:28,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2023-11-24 23:56:28,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107434180] [2023-11-24 23:56:28,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:28,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-24 23:56:28,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:28,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-24 23:56:28,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2023-11-24 23:56:28,356 INFO L87 Difference]: Start difference. First operand 1975 states and 2706 transitions. Second operand has 24 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 14 states have internal predecessors, (72), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:29,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:29,273 INFO L93 Difference]: Finished difference Result 2825 states and 4250 transitions. [2023-11-24 23:56:29,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-11-24 23:56:29,274 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 14 states have internal predecessors, (72), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2023-11-24 23:56:29,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:29,297 INFO L225 Difference]: With dead ends: 2825 [2023-11-24 23:56:29,297 INFO L226 Difference]: Without dead ends: 2824 [2023-11-24 23:56:29,302 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2023-11-24 23:56:29,302 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 481 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 484 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:29,303 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [484 Valid, 370 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-24 23:56:29,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2824 states. [2023-11-24 23:56:29,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2824 to 2647. [2023-11-24 23:56:29,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2647 states, 1896 states have (on average 1.136603375527426) internal successors, (2155), 1992 states have internal predecessors, (2155), 500 states have call successors, (500), 106 states have call predecessors, (500), 246 states have return successors, (909), 548 states have call predecessors, (909), 485 states have call successors, (909) [2023-11-24 23:56:29,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 3564 transitions. [2023-11-24 23:56:29,658 INFO L78 Accepts]: Start accepts. Automaton has 2647 states and 3564 transitions. Word has length 42 [2023-11-24 23:56:29,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:29,660 INFO L495 AbstractCegarLoop]: Abstraction has 2647 states and 3564 transitions. [2023-11-24 23:56:29,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 14 states have internal predecessors, (72), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:29,660 INFO L276 IsEmpty]: Start isEmpty. Operand 2647 states and 3564 transitions. [2023-11-24 23:56:29,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-24 23:56:29,663 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:29,663 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:29,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:29,868 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-24 23:56:29,868 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:29,869 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:29,869 INFO L85 PathProgramCache]: Analyzing trace with hash 798745486, now seen corresponding path program 2 times [2023-11-24 23:56:29,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:29,869 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683518698] [2023-11-24 23:56:29,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:29,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:29,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:30,022 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:56:30,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:30,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683518698] [2023-11-24 23:56:30,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683518698] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:30,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685206487] [2023-11-24 23:56:30,024 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:56:30,024 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:30,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:30,025 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:30,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-24 23:56:30,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-24 23:56:30,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:56:30,087 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-24 23:56:30,088 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:30,189 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:56:30,190 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:30,355 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:56:30,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [685206487] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:30,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1134363428] [2023-11-24 23:56:30,358 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-24 23:56:30,358 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:30,359 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:30,360 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:30,360 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 8] total 18 [2023-11-24 23:56:30,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830130045] [2023-11-24 23:56:30,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:30,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-24 23:56:30,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:30,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-24 23:56:30,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:56:30,363 INFO L87 Difference]: Start difference. First operand 2647 states and 3564 transitions. Second operand has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 15 states have internal predecessors, (65), 7 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-24 23:56:31,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:31,638 INFO L93 Difference]: Finished difference Result 5352 states and 8889 transitions. [2023-11-24 23:56:31,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-24 23:56:31,639 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 15 states have internal predecessors, (65), 7 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 43 [2023-11-24 23:56:31,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:31,673 INFO L225 Difference]: With dead ends: 5352 [2023-11-24 23:56:31,673 INFO L226 Difference]: Without dead ends: 3352 [2023-11-24 23:56:31,708 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=273, Invalid=987, Unknown=0, NotChecked=0, Total=1260 [2023-11-24 23:56:31,709 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 201 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:31,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 104 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-24 23:56:31,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3352 states. [2023-11-24 23:56:32,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3352 to 3122. [2023-11-24 23:56:32,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3122 states, 2172 states have (on average 1.0980662983425415) internal successors, (2385), 2208 states have internal predecessors, (2385), 572 states have call successors, (572), 104 states have call predecessors, (572), 373 states have return successors, (1358), 809 states have call predecessors, (1358), 543 states have call successors, (1358) [2023-11-24 23:56:32,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3122 states to 3122 states and 4315 transitions. [2023-11-24 23:56:32,269 INFO L78 Accepts]: Start accepts. Automaton has 3122 states and 4315 transitions. Word has length 43 [2023-11-24 23:56:32,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:32,270 INFO L495 AbstractCegarLoop]: Abstraction has 3122 states and 4315 transitions. [2023-11-24 23:56:32,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 15 states have internal predecessors, (65), 7 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-24 23:56:32,271 INFO L276 IsEmpty]: Start isEmpty. Operand 3122 states and 4315 transitions. [2023-11-24 23:56:32,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-24 23:56:32,275 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:32,275 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:32,287 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-11-24 23:56:32,481 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-24 23:56:32,481 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:32,482 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:32,482 INFO L85 PathProgramCache]: Analyzing trace with hash -1295270540, now seen corresponding path program 1 times [2023-11-24 23:56:32,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:32,482 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933797951] [2023-11-24 23:56:32,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:32,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:32,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:32,616 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 52 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-24 23:56:32,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:32,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933797951] [2023-11-24 23:56:32,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933797951] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:32,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151469186] [2023-11-24 23:56:32,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:32,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:32,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:32,619 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:32,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-24 23:56:32,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:32,696 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-24 23:56:32,699 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:32,743 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 52 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-24 23:56:32,743 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:32,900 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 53 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-24 23:56:32,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151469186] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:32,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1222225849] [2023-11-24 23:56:32,904 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-24 23:56:32,904 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:32,905 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:32,907 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:32,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 11 [2023-11-24 23:56:32,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048801353] [2023-11-24 23:56:32,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:32,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-24 23:56:32,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:32,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-24 23:56:32,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2023-11-24 23:56:32,910 INFO L87 Difference]: Start difference. First operand 3122 states and 4315 transitions. Second operand has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 9 states have internal predecessors, (45), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:56:33,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:33,605 INFO L93 Difference]: Finished difference Result 5335 states and 8133 transitions. [2023-11-24 23:56:33,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-24 23:56:33,606 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 9 states have internal predecessors, (45), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 50 [2023-11-24 23:56:33,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:33,639 INFO L225 Difference]: With dead ends: 5335 [2023-11-24 23:56:33,640 INFO L226 Difference]: Without dead ends: 3133 [2023-11-24 23:56:33,676 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 95 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=246, Unknown=0, NotChecked=0, Total=342 [2023-11-24 23:56:33,677 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 83 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:33,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 127 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:56:33,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3133 states. [2023-11-24 23:56:34,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3133 to 3117. [2023-11-24 23:56:34,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3117 states, 2168 states have (on average 1.0968634686346863) internal successors, (2378), 2206 states have internal predecessors, (2378), 571 states have call successors, (571), 104 states have call predecessors, (571), 373 states have return successors, (1355), 806 states have call predecessors, (1355), 540 states have call successors, (1355) [2023-11-24 23:56:34,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3117 states to 3117 states and 4304 transitions. [2023-11-24 23:56:34,250 INFO L78 Accepts]: Start accepts. Automaton has 3117 states and 4304 transitions. Word has length 50 [2023-11-24 23:56:34,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:34,251 INFO L495 AbstractCegarLoop]: Abstraction has 3117 states and 4304 transitions. [2023-11-24 23:56:34,251 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 9 states have internal predecessors, (45), 5 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-24 23:56:34,251 INFO L276 IsEmpty]: Start isEmpty. Operand 3117 states and 4304 transitions. [2023-11-24 23:56:34,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-24 23:56:34,256 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:34,256 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:34,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:34,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:34,463 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:34,464 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:34,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1345923957, now seen corresponding path program 3 times [2023-11-24 23:56:34,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:34,464 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985542211] [2023-11-24 23:56:34,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:34,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:34,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:34,752 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 3 proven. 71 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:56:34,753 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:34,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985542211] [2023-11-24 23:56:34,753 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985542211] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:34,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833673617] [2023-11-24 23:56:34,753 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-24 23:56:34,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:34,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:34,755 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:34,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-24 23:56:34,823 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-24 23:56:34,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:56:34,824 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-24 23:56:34,828 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:34,930 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 53 proven. 2 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-24 23:56:34,930 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:35,018 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 53 proven. 2 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-24 23:56:35,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833673617] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:35,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [660673089] [2023-11-24 23:56:35,023 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-24 23:56:35,023 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:35,024 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:35,025 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:35,026 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6] total 19 [2023-11-24 23:56:35,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290016797] [2023-11-24 23:56:35,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:35,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-24 23:56:35,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:35,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-24 23:56:35,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2023-11-24 23:56:35,030 INFO L87 Difference]: Start difference. First operand 3117 states and 4304 transitions. Second operand has 19 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (11), 7 states have call predecessors, (11), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:56:36,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:36,162 INFO L93 Difference]: Finished difference Result 4282 states and 6284 transitions. [2023-11-24 23:56:36,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-24 23:56:36,169 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (11), 7 states have call predecessors, (11), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 50 [2023-11-24 23:56:36,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:36,194 INFO L225 Difference]: With dead ends: 4282 [2023-11-24 23:56:36,194 INFO L226 Difference]: Without dead ends: 1517 [2023-11-24 23:56:36,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=314, Invalid=1092, Unknown=0, NotChecked=0, Total=1406 [2023-11-24 23:56:36,223 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 391 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:36,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [391 Valid, 98 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 323 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-24 23:56:36,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1517 states. [2023-11-24 23:56:36,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1517 to 1398. [2023-11-24 23:56:36,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1398 states, 989 states have (on average 1.0819009100101111) internal successors, (1070), 999 states have internal predecessors, (1070), 256 states have call successors, (256), 60 states have call predecessors, (256), 148 states have return successors, (452), 338 states have call predecessors, (452), 252 states have call successors, (452) [2023-11-24 23:56:36,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1398 states to 1398 states and 1778 transitions. [2023-11-24 23:56:36,423 INFO L78 Accepts]: Start accepts. Automaton has 1398 states and 1778 transitions. Word has length 50 [2023-11-24 23:56:36,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:36,424 INFO L495 AbstractCegarLoop]: Abstraction has 1398 states and 1778 transitions. [2023-11-24 23:56:36,424 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (11), 7 states have call predecessors, (11), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 23:56:36,424 INFO L276 IsEmpty]: Start isEmpty. Operand 1398 states and 1778 transitions. [2023-11-24 23:56:36,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-24 23:56:36,426 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:36,426 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:36,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:36,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-24 23:56:36,633 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:36,634 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:36,634 INFO L85 PathProgramCache]: Analyzing trace with hash 553185385, now seen corresponding path program 1 times [2023-11-24 23:56:36,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:36,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034529231] [2023-11-24 23:56:36,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:36,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:36,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:36,907 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-24 23:56:36,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:36,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034529231] [2023-11-24 23:56:36,908 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034529231] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:36,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297276165] [2023-11-24 23:56:36,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:36,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:36,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:36,910 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:36,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-24 23:56:36,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:36,988 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-24 23:56:36,990 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:37,050 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-24 23:56:37,051 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:37,790 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-24 23:56:37,790 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297276165] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:37,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [772688383] [2023-11-24 23:56:37,796 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-24 23:56:37,796 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:37,798 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:37,799 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:37,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 13] total 25 [2023-11-24 23:56:37,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365444366] [2023-11-24 23:56:37,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:37,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-24 23:56:37,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:37,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-24 23:56:37,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2023-11-24 23:56:37,804 INFO L87 Difference]: Start difference. First operand 1398 states and 1778 transitions. Second operand has 26 states, 25 states have (on average 2.12) internal successors, (53), 20 states have internal predecessors, (53), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-24 23:56:40,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:40,488 INFO L93 Difference]: Finished difference Result 4227 states and 7026 transitions. [2023-11-24 23:56:40,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2023-11-24 23:56:40,489 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.12) internal successors, (53), 20 states have internal predecessors, (53), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) Word has length 52 [2023-11-24 23:56:40,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:40,531 INFO L225 Difference]: With dead ends: 4227 [2023-11-24 23:56:40,532 INFO L226 Difference]: Without dead ends: 4197 [2023-11-24 23:56:40,538 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2374 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1466, Invalid=6724, Unknown=0, NotChecked=0, Total=8190 [2023-11-24 23:56:40,539 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 221 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 275 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 803 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 275 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:40,539 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 284 Invalid, 803 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [275 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-24 23:56:40,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4197 states. [2023-11-24 23:56:40,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4197 to 3144. [2023-11-24 23:56:40,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3144 states, 2065 states have (on average 1.0576271186440678) internal successors, (2184), 2071 states have internal predecessors, (2184), 632 states have call successors, (632), 82 states have call predecessors, (632), 442 states have return successors, (2651), 990 states have call predecessors, (2651), 626 states have call successors, (2651) [2023-11-24 23:56:41,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3144 states to 3144 states and 5467 transitions. [2023-11-24 23:56:41,021 INFO L78 Accepts]: Start accepts. Automaton has 3144 states and 5467 transitions. Word has length 52 [2023-11-24 23:56:41,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:41,022 INFO L495 AbstractCegarLoop]: Abstraction has 3144 states and 5467 transitions. [2023-11-24 23:56:41,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.12) internal successors, (53), 20 states have internal predecessors, (53), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-24 23:56:41,022 INFO L276 IsEmpty]: Start isEmpty. Operand 3144 states and 5467 transitions. [2023-11-24 23:56:41,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-11-24 23:56:41,024 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:41,024 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2023-11-24 23:56:41,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:41,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:41,231 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:41,231 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:41,231 INFO L85 PathProgramCache]: Analyzing trace with hash -352778574, now seen corresponding path program 1 times [2023-11-24 23:56:41,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:41,232 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758244597] [2023-11-24 23:56:41,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:41,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:41,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:41,563 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-24 23:56:41,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:41,563 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758244597] [2023-11-24 23:56:41,563 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758244597] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:41,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662709412] [2023-11-24 23:56:41,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:41,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:41,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:41,566 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:41,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-11-24 23:56:41,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:41,662 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-24 23:56:41,665 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:41,793 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-24 23:56:41,794 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:42,037 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-24 23:56:42,038 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662709412] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:42,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [972618297] [2023-11-24 23:56:42,040 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-24 23:56:42,040 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:42,041 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:42,042 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:42,042 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2023-11-24 23:56:42,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835753545] [2023-11-24 23:56:42,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:42,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-24 23:56:42,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:42,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-24 23:56:42,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2023-11-24 23:56:42,045 INFO L87 Difference]: Start difference. First operand 3144 states and 5467 transitions. Second operand has 24 states, 23 states have (on average 3.608695652173913) internal successors, (83), 14 states have internal predecessors, (83), 10 states have call successors, (16), 10 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:43,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:43,685 INFO L93 Difference]: Finished difference Result 8088 states and 14059 transitions. [2023-11-24 23:56:43,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-11-24 23:56:43,685 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.608695652173913) internal successors, (83), 14 states have internal predecessors, (83), 10 states have call successors, (16), 10 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2023-11-24 23:56:43,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:43,752 INFO L225 Difference]: With dead ends: 8088 [2023-11-24 23:56:43,753 INFO L226 Difference]: Without dead ends: 8086 [2023-11-24 23:56:43,761 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2023-11-24 23:56:43,762 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 801 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 806 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:43,762 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [806 Valid, 300 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [292 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-24 23:56:43,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8086 states. [2023-11-24 23:56:44,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8086 to 8058. [2023-11-24 23:56:44,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8058 states, 5293 states have (on average 1.056489703381825) internal successors, (5592), 5299 states have internal predecessors, (5592), 1616 states have call successors, (1616), 208 states have call predecessors, (1616), 1144 states have return successors, (6821), 2550 states have call predecessors, (6821), 1610 states have call successors, (6821) [2023-11-24 23:56:45,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8058 states to 8058 states and 14029 transitions. [2023-11-24 23:56:45,021 INFO L78 Accepts]: Start accepts. Automaton has 8058 states and 14029 transitions. Word has length 56 [2023-11-24 23:56:45,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:45,021 INFO L495 AbstractCegarLoop]: Abstraction has 8058 states and 14029 transitions. [2023-11-24 23:56:45,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.608695652173913) internal successors, (83), 14 states have internal predecessors, (83), 10 states have call successors, (16), 10 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:56:45,022 INFO L276 IsEmpty]: Start isEmpty. Operand 8058 states and 14029 transitions. [2023-11-24 23:56:45,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-11-24 23:56:45,024 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:45,024 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:45,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:45,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:45,229 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:45,230 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:45,230 INFO L85 PathProgramCache]: Analyzing trace with hash -2005451109, now seen corresponding path program 1 times [2023-11-24 23:56:45,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:45,230 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146797354] [2023-11-24 23:56:45,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:45,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:45,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:45,473 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 51 proven. 11 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-11-24 23:56:45,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:45,473 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146797354] [2023-11-24 23:56:45,473 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146797354] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:45,473 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492750720] [2023-11-24 23:56:45,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:45,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:45,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:45,475 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:45,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-11-24 23:56:45,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:45,551 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-24 23:56:45,553 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:45,610 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 43 proven. 14 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-11-24 23:56:45,611 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:46,752 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 60 proven. 2 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-11-24 23:56:46,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [492750720] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:46,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [893975040] [2023-11-24 23:56:46,755 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-24 23:56:46,755 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:46,756 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:46,757 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:46,757 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 14] total 27 [2023-11-24 23:56:46,757 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854043270] [2023-11-24 23:56:46,758 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:46,758 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-24 23:56:46,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:46,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-24 23:56:46,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2023-11-24 23:56:46,761 INFO L87 Difference]: Start difference. First operand 8058 states and 14029 transitions. Second operand has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 20 states have internal predecessors, (59), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-24 23:56:49,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:49,005 INFO L93 Difference]: Finished difference Result 16972 states and 33384 transitions. [2023-11-24 23:56:49,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-11-24 23:56:49,006 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 20 states have internal predecessors, (59), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 71 [2023-11-24 23:56:49,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:49,071 INFO L225 Difference]: With dead ends: 16972 [2023-11-24 23:56:49,072 INFO L226 Difference]: Without dead ends: 9352 [2023-11-24 23:56:49,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=714, Invalid=2826, Unknown=0, NotChecked=0, Total=3540 [2023-11-24 23:56:49,154 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 138 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 734 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:49,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 327 Invalid, 819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 734 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:56:49,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9352 states. [2023-11-24 23:56:50,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9352 to 9091. [2023-11-24 23:56:50,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9091 states, 5952 states have (on average 1.0460349462365592) internal successors, (6226), 5957 states have internal predecessors, (6226), 1849 states have call successors, (1849), 235 states have call predecessors, (1849), 1286 states have return successors, (5776), 2898 states have call predecessors, (5776), 1843 states have call successors, (5776) [2023-11-24 23:56:50,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9091 states to 9091 states and 13851 transitions. [2023-11-24 23:56:50,635 INFO L78 Accepts]: Start accepts. Automaton has 9091 states and 13851 transitions. Word has length 71 [2023-11-24 23:56:50,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:50,636 INFO L495 AbstractCegarLoop]: Abstraction has 9091 states and 13851 transitions. [2023-11-24 23:56:50,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 20 states have internal predecessors, (59), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-24 23:56:50,636 INFO L276 IsEmpty]: Start isEmpty. Operand 9091 states and 13851 transitions. [2023-11-24 23:56:50,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-11-24 23:56:50,640 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:50,640 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 5, 5, 5, 5, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:56:50,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:50,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-11-24 23:56:50,854 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:50,854 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:50,854 INFO L85 PathProgramCache]: Analyzing trace with hash -924055203, now seen corresponding path program 2 times [2023-11-24 23:56:50,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:50,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778911805] [2023-11-24 23:56:50,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:50,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:50,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:51,230 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 91 proven. 35 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-24 23:56:51,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:51,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778911805] [2023-11-24 23:56:51,231 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778911805] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:51,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556906194] [2023-11-24 23:56:51,231 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:56:51,231 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:51,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:51,232 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:51,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-11-24 23:56:51,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-11-24 23:56:51,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:56:51,313 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-24 23:56:51,316 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:51,378 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 83 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-24 23:56:51,378 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:56:52,505 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 103 proven. 23 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-24 23:56:52,505 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1556906194] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:56:52,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2096578086] [2023-11-24 23:56:52,507 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-24 23:56:52,508 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:56:52,508 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:56:52,509 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:56:52,510 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 18] total 35 [2023-11-24 23:56:52,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364973059] [2023-11-24 23:56:52,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:56:52,511 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-11-24 23:56:52,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:56:52,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-11-24 23:56:52,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1111, Unknown=0, NotChecked=0, Total=1260 [2023-11-24 23:56:52,513 INFO L87 Difference]: Start difference. First operand 9091 states and 13851 transitions. Second operand has 36 states, 35 states have (on average 2.4857142857142858) internal successors, (87), 24 states have internal predecessors, (87), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-24 23:56:55,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:56:55,516 INFO L93 Difference]: Finished difference Result 18949 states and 30215 transitions. [2023-11-24 23:56:55,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2023-11-24 23:56:55,516 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.4857142857142858) internal successors, (87), 24 states have internal predecessors, (87), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 79 [2023-11-24 23:56:55,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:56:55,568 INFO L225 Difference]: With dead ends: 18949 [2023-11-24 23:56:55,569 INFO L226 Difference]: Without dead ends: 10296 [2023-11-24 23:56:55,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2001 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1644, Invalid=6728, Unknown=0, NotChecked=0, Total=8372 [2023-11-24 23:56:55,640 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 297 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:56:55,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [297 Valid, 320 Invalid, 908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 728 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:56:55,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10296 states. [2023-11-24 23:56:56,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10296 to 8519. [2023-11-24 23:56:56,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8519 states, 5708 states have (on average 1.05395935529082) internal successors, (6016), 5732 states have internal predecessors, (6016), 1682 states have call successors, (1682), 279 states have call predecessors, (1682), 1125 states have return successors, (3512), 2507 states have call predecessors, (3512), 1677 states have call successors, (3512) [2023-11-24 23:56:56,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8519 states to 8519 states and 11210 transitions. [2023-11-24 23:56:56,603 INFO L78 Accepts]: Start accepts. Automaton has 8519 states and 11210 transitions. Word has length 79 [2023-11-24 23:56:56,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:56:56,604 INFO L495 AbstractCegarLoop]: Abstraction has 8519 states and 11210 transitions. [2023-11-24 23:56:56,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.4857142857142858) internal successors, (87), 24 states have internal predecessors, (87), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-24 23:56:56,604 INFO L276 IsEmpty]: Start isEmpty. Operand 8519 states and 11210 transitions. [2023-11-24 23:56:56,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-11-24 23:56:56,608 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:56:56,608 INFO L195 NwaCegarLoop]: trace histogram [12, 8, 7, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-24 23:56:56,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-11-24 23:56:56,814 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-11-24 23:56:56,814 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-11-24 23:56:56,814 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:56:56,815 INFO L85 PathProgramCache]: Analyzing trace with hash 2143415402, now seen corresponding path program 2 times [2023-11-24 23:56:56,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:56:56,815 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983689996] [2023-11-24 23:56:56,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:56:56,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:56:56,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:56:56,941 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 132 proven. 31 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2023-11-24 23:56:56,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:56:56,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1983689996] [2023-11-24 23:56:56,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1983689996] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:56:56,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612132239] [2023-11-24 23:56:56,942 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:56:56,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:56:56,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:56:56,944 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:56:56,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_868d1cc7-ff52-4b85-bbd3-d4bbc5f10237/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-11-24 23:56:57,052 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-24 23:56:57,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:56:57,054 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-24 23:56:57,056 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:56:57,279 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 43 proven. 51 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2023-11-24 23:56:57,279 INFO L327 TraceCheckSpWp]: Computing backward predicates...