./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/diamond_1-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/diamond_1-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bd9be28702be20fbd75b67eebfdc5f85895ff340c238c235c391c2a8578e7b23 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:42:36,181 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:42:36,295 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:42:36,306 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:42:36,307 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:42:36,348 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:42:36,348 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:42:36,349 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:42:36,350 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:42:36,355 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:42:36,356 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:42:36,357 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:42:36,358 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:42:36,359 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:42:36,360 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:42:36,360 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:42:36,361 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:42:36,361 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:42:36,362 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:42:36,362 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:42:36,363 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:42:36,364 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:42:36,365 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:42:36,365 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:42:36,366 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:42:36,366 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:42:36,367 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:42:36,367 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:42:36,368 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:42:36,368 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:42:36,370 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:42:36,370 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:42:36,370 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:42:36,371 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:42:36,371 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:42:36,371 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:42:36,372 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:42:36,372 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:42:36,372 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:42:36,373 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:42:36,373 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:42:36,373 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:42:36,374 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:42:36,374 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:42:36,375 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:42:36,375 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:42:36,375 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:42:36,376 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_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bd9be28702be20fbd75b67eebfdc5f85895ff340c238c235c391c2a8578e7b23 [2023-11-21 19:42:36,686 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:42:36,713 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:42:36,716 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:42:36,718 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:42:36,719 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:42:36,720 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/loop-acceleration/diamond_1-1.c [2023-11-21 19:42:39,821 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:42:40,129 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:42:40,130 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/sv-benchmarks/c/loop-acceleration/diamond_1-1.c [2023-11-21 19:42:40,138 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/data/24f29f51c/90a9270f8f0e4304bfc47ab61a9531f1/FLAG75b51eefb [2023-11-21 19:42:40,165 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/data/24f29f51c/90a9270f8f0e4304bfc47ab61a9531f1 [2023-11-21 19:42:40,171 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:42:40,173 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:42:40,178 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:42:40,178 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:42:40,184 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:42:40,187 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,188 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2674fc07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40, skipping insertion in model container [2023-11-21 19:42:40,189 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,213 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:42:40,420 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/sv-benchmarks/c/loop-acceleration/diamond_1-1.c[373,386] [2023-11-21 19:42:40,438 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:42:40,452 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:42:40,466 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/sv-benchmarks/c/loop-acceleration/diamond_1-1.c[373,386] [2023-11-21 19:42:40,472 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:42:40,489 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:42:40,490 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40 WrapperNode [2023-11-21 19:42:40,490 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:42:40,491 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:42:40,492 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:42:40,492 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:42:40,499 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,507 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,526 INFO L138 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 29 [2023-11-21 19:42:40,526 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:42:40,527 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:42:40,527 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:42:40,527 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:42:40,536 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,537 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,539 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,539 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,545 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,549 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,554 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,555 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,556 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:42:40,559 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:42:40,559 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:42:40,559 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:42:40,560 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (1/1) ... [2023-11-21 19:42:40,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:42:40,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:42:40,596 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:42:40,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:42:40,643 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:42:40,644 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:42:40,645 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:42:40,645 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:42:40,722 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:42:40,724 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:42:40,918 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:42:40,952 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:42:40,952 INFO L308 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-21 19:42:40,954 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:42:40 BoogieIcfgContainer [2023-11-21 19:42:40,954 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:42:40,957 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:42:40,957 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:42:40,960 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:42:40,961 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:42:40" (1/3) ... [2023-11-21 19:42:40,961 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40123a7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:42:40, skipping insertion in model container [2023-11-21 19:42:40,962 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:42:40" (2/3) ... [2023-11-21 19:42:40,962 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40123a7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:42:40, skipping insertion in model container [2023-11-21 19:42:40,962 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:42:40" (3/3) ... [2023-11-21 19:42:40,963 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_1-1.c [2023-11-21 19:42:40,982 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:42:40,983 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:42:41,029 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:42:41,036 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;@342f4bfc, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:42:41,037 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:42:41,041 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:41,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-21 19:42:41,047 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:42:41,047 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-21 19:42:41,048 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:42:41,053 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:42:41,053 INFO L85 PathProgramCache]: Analyzing trace with hash 2066920, now seen corresponding path program 1 times [2023-11-21 19:42:41,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:42:41,064 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092510500] [2023-11-21 19:42:41,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:42:41,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:42:41,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:42:41,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:41,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:42:41,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092510500] [2023-11-21 19:42:41,268 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092510500] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:42:41,268 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:42:41,269 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:42:41,270 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322568407] [2023-11-21 19:42:41,271 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:42:41,275 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:42:41,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:42:41,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:42:41,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:42:41,307 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:41,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:42:41,345 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2023-11-21 19:42:41,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:42:41,348 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-21 19:42:41,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:42:41,355 INFO L225 Difference]: With dead ends: 13 [2023-11-21 19:42:41,356 INFO L226 Difference]: Without dead ends: 6 [2023-11-21 19:42:41,358 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:42:41,362 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:42:41,364 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:42:41,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2023-11-21 19:42:41,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2023-11-21 19:42:41,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:41,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2023-11-21 19:42:41,394 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2023-11-21 19:42:41,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:42:41,395 INFO L495 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2023-11-21 19:42:41,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:41,395 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2023-11-21 19:42:41,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-21 19:42:41,396 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:42:41,396 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-21 19:42:41,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:42:41,397 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:42:41,397 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:42:41,398 INFO L85 PathProgramCache]: Analyzing trace with hash 64032200, now seen corresponding path program 1 times [2023-11-21 19:42:41,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:42:41,398 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024569912] [2023-11-21 19:42:41,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:42:41,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:42:41,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:42:41,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:41,621 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:42:41,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024569912] [2023-11-21 19:42:41,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024569912] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:42:41,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434824381] [2023-11-21 19:42:41,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:42:41,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:42:41,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:42:41,625 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:42:41,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:42:41,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:42:41,698 INFO L262 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-21 19:42:41,704 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:42:42,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:42,026 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:42:42,953 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:42,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434824381] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:42:42,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1108901571] [2023-11-21 19:42:42,979 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:42:42,979 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:42:42,983 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:42:42,988 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:42:42,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:42:43,104 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:42:43,185 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '68#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) (mod |ULTIMATE.start_main_~y~0#1| 2))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 99 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)))' at error location [2023-11-21 19:42:43,186 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:42:43,186 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:42:43,186 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 4] total 7 [2023-11-21 19:42:43,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089601408] [2023-11-21 19:42:43,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:42:43,189 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 19:42:43,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:42:43,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 19:42:43,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:42:43,192 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:43,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:42:43,333 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2023-11-21 19:42:43,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 19:42:43,334 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-21 19:42:43,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:42:43,334 INFO L225 Difference]: With dead ends: 14 [2023-11-21 19:42:43,335 INFO L226 Difference]: Without dead ends: 9 [2023-11-21 19:42:43,337 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2023-11-21 19:42:43,341 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 3 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:42:43,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 11 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:42:43,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-21 19:42:43,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-21 19:42:43,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:43,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2023-11-21 19:42:43,350 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2023-11-21 19:42:43,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:42:43,351 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2023-11-21 19:42:43,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:43,352 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2023-11-21 19:42:43,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-21 19:42:43,352 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:42:43,353 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2023-11-21 19:42:43,378 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-21 19:42:43,574 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:42:43,574 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:42:43,574 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:42:43,575 INFO L85 PathProgramCache]: Analyzing trace with hash 575767016, now seen corresponding path program 2 times [2023-11-21 19:42:43,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:42:43,575 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428634599] [2023-11-21 19:42:43,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:42:43,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:42:43,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:42:44,060 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:44,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:42:44,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428634599] [2023-11-21 19:42:44,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428634599] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:42:44,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044444294] [2023-11-21 19:42:44,065 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:42:44,065 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:42:44,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:42:44,067 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:42:44,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:42:44,112 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-21 19:42:44,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:42:44,113 INFO L262 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-21 19:42:44,115 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:42:44,414 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:44,415 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:42:44,920 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:44,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044444294] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:42:44,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [653872307] [2023-11-21 19:42:44,922 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:42:44,922 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:42:44,923 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:42:44,923 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:42:44,923 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:42:44,977 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:42:45,101 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '166#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) (mod |ULTIMATE.start_main_~y~0#1| 2))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 99 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)))' at error location [2023-11-21 19:42:45,101 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:42:45,101 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:42:45,102 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 13 [2023-11-21 19:42:45,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666664901] [2023-11-21 19:42:45,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:42:45,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-21 19:42:45,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:42:45,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-21 19:42:45,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2023-11-21 19:42:45,104 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:45,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:42:45,827 INFO L93 Difference]: Finished difference Result 19 states and 24 transitions. [2023-11-21 19:42:45,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 19:42:45,829 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-21 19:42:45,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:42:45,829 INFO L225 Difference]: With dead ends: 19 [2023-11-21 19:42:45,829 INFO L226 Difference]: Without dead ends: 15 [2023-11-21 19:42:45,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2023-11-21 19:42:45,831 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 23 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:42:45,832 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 11 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:42:45,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-21 19:42:45,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-21 19:42:45,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:45,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2023-11-21 19:42:45,844 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2023-11-21 19:42:45,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:42:45,846 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2023-11-21 19:42:45,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:42:45,847 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2023-11-21 19:42:45,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-21 19:42:45,848 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:42:45,849 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2023-11-21 19:42:45,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:42:46,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:42:46,062 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:42:46,062 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:42:46,063 INFO L85 PathProgramCache]: Analyzing trace with hash -692324888, now seen corresponding path program 3 times [2023-11-21 19:42:46,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:42:46,063 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071877527] [2023-11-21 19:42:46,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:42:46,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:42:46,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:42:46,923 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:46,924 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:42:46,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071877527] [2023-11-21 19:42:46,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071877527] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:42:46,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954368529] [2023-11-21 19:42:46,924 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:42:46,925 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:42:46,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:42:46,926 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:42:46,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:42:46,992 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:42:46,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:42:46,993 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-21 19:42:46,996 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:42:47,528 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:47,529 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:42:48,812 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:42:48,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954368529] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:42:48,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [209214949] [2023-11-21 19:42:48,814 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:42:48,814 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:42:48,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:42:48,815 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:42:48,815 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:42:48,861 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:42:49,028 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '340#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) (mod |ULTIMATE.start_main_~y~0#1| 2))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 99 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)))' at error location [2023-11-21 19:42:49,028 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:42:49,028 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:42:49,029 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-21 19:42:49,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085022658] [2023-11-21 19:42:49,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:42:49,029 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-21 19:42:49,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:42:49,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-21 19:42:49,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=557, Unknown=0, NotChecked=0, Total=756 [2023-11-21 19:42:49,031 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:43:00,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:43:00,376 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2023-11-21 19:43:00,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-21 19:43:00,377 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-21 19:43:00,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:43:00,378 INFO L225 Difference]: With dead ends: 30 [2023-11-21 19:43:00,378 INFO L226 Difference]: Without dead ends: 27 [2023-11-21 19:43:00,379 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 21 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=449, Invalid=957, Unknown=0, NotChecked=0, Total=1406 [2023-11-21 19:43:00,380 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:43:00,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:43:00,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-21 19:43:00,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-21 19:43:00,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:43:00,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2023-11-21 19:43:00,396 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2023-11-21 19:43:00,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:43:00,396 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2023-11-21 19:43:00,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:43:00,397 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2023-11-21 19:43:00,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-21 19:43:00,398 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:43:00,398 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2023-11-21 19:43:00,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:43:00,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:43:00,612 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:43:00,613 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:43:00,613 INFO L85 PathProgramCache]: Analyzing trace with hash 719052264, now seen corresponding path program 4 times [2023-11-21 19:43:00,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:43:00,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94396742] [2023-11-21 19:43:00,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:43:00,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:43:00,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:43:02,851 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:43:02,851 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:43:02,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94396742] [2023-11-21 19:43:02,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94396742] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:43:02,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36285833] [2023-11-21 19:43:02,852 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:43:02,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:43:02,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:43:02,854 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:43:02,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac1560f1-147e-4b00-93a6-0e82be3c3b4b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:43:02,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:43:02,933 INFO L262 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-21 19:43:02,937 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:43:04,302 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:43:04,302 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:43:07,686 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:43:07,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36285833] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:43:07,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [224143666] [2023-11-21 19:43:07,688 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:43:07,688 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:43:07,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:43:07,689 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:43:07,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:43:07,724 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:43:07,997 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '665#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (not (= (mod |ULTIMATE.start_main_~x~0#1| 2) (mod |ULTIMATE.start_main_~y~0#1| 2))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= 99 (mod |ULTIMATE.start_main_~x~0#1| 4294967296)))' at error location [2023-11-21 19:43:07,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:43:07,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:43:07,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2023-11-21 19:43:07,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084378344] [2023-11-21 19:43:07,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:43:07,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-11-21 19:43:07,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:43:08,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-11-21 19:43:08,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=679, Invalid=1973, Unknown=0, NotChecked=0, Total=2652 [2023-11-21 19:43:08,003 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:43:15,715 WARN L293 SmtUtils]: Spent 6.42s on a formula simplification. DAG size of input: 287 DAG size of output: 13 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-11-21 19:43:23,563 WARN L293 SmtUtils]: Spent 5.11s on a formula simplification. DAG size of input: 278 DAG size of output: 27 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)