./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/gcd02.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 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_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/gcd02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --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 5840bf8cb045a250261e3957017079dce43a53700f7c91e31c16b36d5b980e00 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 02:30:44,375 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:30:44,378 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:30:44,422 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:30:44,423 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:30:44,426 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:30:44,429 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:30:44,431 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:30:44,433 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:30:44,439 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:30:44,440 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:30:44,441 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:30:44,442 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:30:44,445 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:30:44,446 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:30:44,448 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:30:44,450 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:30:44,451 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:30:44,452 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:30:44,459 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:30:44,460 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:30:44,463 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:30:44,464 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:30:44,465 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:30:44,474 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:30:44,475 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:30:44,475 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:30:44,476 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:30:44,478 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:30:44,479 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:30:44,479 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:30:44,480 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:30:44,483 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:30:44,484 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:30:44,485 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:30:44,486 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:30:44,487 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:30:44,487 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:30:44,487 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:30:44,488 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:30:44,489 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:30:44,489 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:30:44,528 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:30:44,528 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:30:44,529 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:30:44,529 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:30:44,530 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:30:44,530 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:30:44,530 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:30:44,531 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:30:44,531 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:30:44,531 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:30:44,532 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:30:44,532 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:30:44,533 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:30:44,533 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:30:44,533 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:30:44,533 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:30:44,534 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:30:44,534 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:30:44,535 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:30:44,535 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:30:44,535 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:30:44,535 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:30:44,536 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:30:44,536 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:30:44,536 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:30:44,536 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:30:44,536 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:30:44,537 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:30:44,537 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:30:44,537 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:30:44,537 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:30:44,538 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:30:44,538 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:30:44,538 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:30:44,539 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:30:44,539 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:30:44,539 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:30:44,539 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:30:44,540 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:30:44,540 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:30:44,540 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:30:44,540 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5840bf8cb045a250261e3957017079dce43a53700f7c91e31c16b36d5b980e00 [2022-11-22 02:30:44,863 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:30:44,900 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:30:44,903 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:30:44,904 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:30:44,905 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:30:44,906 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/recursive/gcd02.c [2022-11-22 02:30:48,025 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:30:48,214 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:30:48,215 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/sv-benchmarks/c/recursive/gcd02.c [2022-11-22 02:30:48,222 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/data/3937230d4/ad6502eb2f094869a767f8d00ee66f18/FLAGa3f97a95e [2022-11-22 02:30:48,239 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/data/3937230d4/ad6502eb2f094869a767f8d00ee66f18 [2022-11-22 02:30:48,241 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:30:48,243 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:30:48,245 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:30:48,245 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:30:48,249 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:30:48,250 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,251 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4db16abd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48, skipping insertion in model container [2022-11-22 02:30:48,251 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,259 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:30:48,273 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:30:48,473 WARN L237 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_346e4e4c-31fd-432a-929a-cfd2ff687779/sv-benchmarks/c/recursive/gcd02.c[623,636] [2022-11-22 02:30:48,488 WARN L237 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_346e4e4c-31fd-432a-929a-cfd2ff687779/sv-benchmarks/c/recursive/gcd02.c[1283,1296] [2022-11-22 02:30:48,489 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:30:48,497 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:30:48,509 WARN L237 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_346e4e4c-31fd-432a-929a-cfd2ff687779/sv-benchmarks/c/recursive/gcd02.c[623,636] [2022-11-22 02:30:48,516 WARN L237 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_346e4e4c-31fd-432a-929a-cfd2ff687779/sv-benchmarks/c/recursive/gcd02.c[1283,1296] [2022-11-22 02:30:48,517 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:30:48,529 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:30:48,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48 WrapperNode [2022-11-22 02:30:48,530 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:30:48,531 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:30:48,531 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:30:48,531 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:30:48,537 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,542 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,556 INFO L138 Inliner]: procedures = 14, calls = 20, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 45 [2022-11-22 02:30:48,556 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:30:48,557 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:30:48,557 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:30:48,557 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:30:48,570 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,574 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,575 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,576 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,579 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,581 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,582 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,583 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,584 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:30:48,585 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:30:48,585 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:30:48,585 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:30:48,586 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (1/1) ... [2022-11-22 02:30:48,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:30:48,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:48,620 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:30:48,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:30:48,666 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:30:48,666 INFO L130 BoogieDeclarations]: Found specification of procedure gcd [2022-11-22 02:30:48,666 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd [2022-11-22 02:30:48,666 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:30:48,666 INFO L130 BoogieDeclarations]: Found specification of procedure divides [2022-11-22 02:30:48,666 INFO L138 BoogieDeclarations]: Found implementation of procedure divides [2022-11-22 02:30:48,666 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:30:48,667 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:30:48,729 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:30:48,731 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:30:48,877 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:30:48,896 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:30:48,897 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-22 02:30:48,899 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:30:48 BoogieIcfgContainer [2022-11-22 02:30:48,899 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:30:48,911 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:30:48,911 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:30:48,914 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:30:48,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:30:48" (1/3) ... [2022-11-22 02:30:48,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@232586f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:30:48, skipping insertion in model container [2022-11-22 02:30:48,916 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:30:48" (2/3) ... [2022-11-22 02:30:48,916 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@232586f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:30:48, skipping insertion in model container [2022-11-22 02:30:48,916 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:30:48" (3/3) ... [2022-11-22 02:30:48,918 INFO L112 eAbstractionObserver]: Analyzing ICFG gcd02.c [2022-11-22 02:30:48,944 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:30:48,945 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-22 02:30:48,990 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:30:48,996 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=LoopsAndPotentialCycles, 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;@71a9b9fc, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:30:48,997 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-22 02:30:49,001 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 22 states have (on average 1.5) internal successors, (33), 24 states have internal predecessors, (33), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-22 02:30:49,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 02:30:49,008 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:49,009 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:49,009 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting gcdErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:49,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:49,015 INFO L85 PathProgramCache]: Analyzing trace with hash -1549950046, now seen corresponding path program 1 times [2022-11-22 02:30:49,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:49,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538884050] [2022-11-22 02:30:49,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:49,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:49,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:49,413 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:30:49,414 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:49,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538884050] [2022-11-22 02:30:49,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538884050] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:30:49,415 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:30:49,415 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-22 02:30:49,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255389367] [2022-11-22 02:30:49,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:30:49,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-22 02:30:49,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:49,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-22 02:30:49,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-22 02:30:49,486 INFO L87 Difference]: Start difference. First operand has 32 states, 22 states have (on average 1.5) internal successors, (33), 24 states have internal predecessors, (33), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 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) [2022-11-22 02:30:49,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:49,751 INFO L93 Difference]: Finished difference Result 73 states and 98 transitions. [2022-11-22 02:30:49,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:30:49,754 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 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 [2022-11-22 02:30:49,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:49,761 INFO L225 Difference]: With dead ends: 73 [2022-11-22 02:30:49,762 INFO L226 Difference]: Without dead ends: 40 [2022-11-22 02:30:49,765 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-11-22 02:30:49,769 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 34 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:49,770 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 101 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:30:49,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-22 02:30:49,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-22 02:30:49,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.25) internal successors, (35), 29 states have internal predecessors, (35), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-22 02:30:49,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2022-11-22 02:30:49,820 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 8 [2022-11-22 02:30:49,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:49,820 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2022-11-22 02:30:49,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 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) [2022-11-22 02:30:49,821 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2022-11-22 02:30:49,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 02:30:49,822 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:49,822 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:49,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 02:30:49,822 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting gcdErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:49,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:49,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1756513854, now seen corresponding path program 1 times [2022-11-22 02:30:49,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:49,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624014294] [2022-11-22 02:30:49,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:49,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:49,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:49,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:30:49,984 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:49,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624014294] [2022-11-22 02:30:49,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624014294] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:30:49,986 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:30:49,986 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-22 02:30:49,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871213955] [2022-11-22 02:30:49,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:30:49,988 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-22 02:30:49,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:49,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-22 02:30:49,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-22 02:30:49,998 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2022-11-22 02:30:50,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:50,119 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2022-11-22 02:30:50,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:30:50,120 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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 13 [2022-11-22 02:30:50,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:50,123 INFO L225 Difference]: With dead ends: 58 [2022-11-22 02:30:50,123 INFO L226 Difference]: Without dead ends: 56 [2022-11-22 02:30:50,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-11-22 02:30:50,125 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 17 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:50,126 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 134 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:30:50,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-22 02:30:50,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2022-11-22 02:30:50,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 36 states have internal predecessors, (44), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:30:50,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2022-11-22 02:30:50,139 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 13 [2022-11-22 02:30:50,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:50,140 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2022-11-22 02:30:50,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2022-11-22 02:30:50,140 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2022-11-22 02:30:50,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 02:30:50,141 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:50,141 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:50,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 02:30:50,142 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting gcdErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:50,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:50,143 INFO L85 PathProgramCache]: Analyzing trace with hash 1759343999, now seen corresponding path program 1 times [2022-11-22 02:30:50,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:50,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77858319] [2022-11-22 02:30:50,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:50,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:50,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:50,333 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:30:50,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:50,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77858319] [2022-11-22 02:30:50,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77858319] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:30:50,335 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:30:50,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-22 02:30:50,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156879] [2022-11-22 02:30:50,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:30:50,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 02:30:50,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:50,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 02:30:50,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-22 02:30:50,340 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 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) [2022-11-22 02:30:50,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:50,602 INFO L93 Difference]: Finished difference Result 62 states and 82 transitions. [2022-11-22 02:30:50,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 02:30:50,603 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 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 13 [2022-11-22 02:30:50,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:50,607 INFO L225 Difference]: With dead ends: 62 [2022-11-22 02:30:50,607 INFO L226 Difference]: Without dead ends: 60 [2022-11-22 02:30:50,608 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=65, Unknown=0, NotChecked=0, Total=110 [2022-11-22 02:30:50,609 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 23 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:50,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 137 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:30:50,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-22 02:30:50,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 48. [2022-11-22 02:30:50,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:30:50,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2022-11-22 02:30:50,623 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 13 [2022-11-22 02:30:50,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:50,623 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2022-11-22 02:30:50,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 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) [2022-11-22 02:30:50,624 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2022-11-22 02:30:50,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 02:30:50,625 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:50,625 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:50,625 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-22 02:30:50,626 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:50,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:50,626 INFO L85 PathProgramCache]: Analyzing trace with hash 1880095371, now seen corresponding path program 1 times [2022-11-22 02:30:50,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:50,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713813628] [2022-11-22 02:30:50,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:50,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:50,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:50,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:30:50,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:50,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713813628] [2022-11-22 02:30:50,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713813628] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:30:50,716 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:30:50,716 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:30:50,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098219494] [2022-11-22 02:30:50,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:30:50,717 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:30:50,717 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:50,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:30:50,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:30:50,718 INFO L87 Difference]: Start difference. First operand 48 states and 60 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 02:30:50,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:50,750 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2022-11-22 02:30:50,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:30:50,751 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2022-11-22 02:30:50,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:50,752 INFO L225 Difference]: With dead ends: 54 [2022-11-22 02:30:50,752 INFO L226 Difference]: Without dead ends: 50 [2022-11-22 02:30:50,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:30:50,753 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:50,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 90 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:30:50,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-22 02:30:50,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-22 02:30:50,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 36 states have internal predecessors, (43), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-11-22 02:30:50,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2022-11-22 02:30:50,766 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 19 [2022-11-22 02:30:50,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:50,766 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2022-11-22 02:30:50,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 02:30:50,767 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2022-11-22 02:30:50,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 02:30:50,768 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:50,768 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:50,768 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-22 02:30:50,769 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:50,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:50,769 INFO L85 PathProgramCache]: Analyzing trace with hash -1134762375, now seen corresponding path program 1 times [2022-11-22 02:30:50,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:50,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751540425] [2022-11-22 02:30:50,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:50,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:50,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:50,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:30:50,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:50,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751540425] [2022-11-22 02:30:50,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1751540425] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:30:50,937 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:30:50,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-22 02:30:50,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570398663] [2022-11-22 02:30:50,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:30:50,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 02:30:50,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:50,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 02:30:50,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-22 02:30:50,940 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 02:30:51,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:51,102 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2022-11-22 02:30:51,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-22 02:30:51,103 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-11-22 02:30:51,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:51,115 INFO L225 Difference]: With dead ends: 68 [2022-11-22 02:30:51,116 INFO L226 Difference]: Without dead ends: 64 [2022-11-22 02:30:51,117 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-22 02:30:51,118 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 16 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:51,126 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 106 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:30:51,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-22 02:30:51,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 56. [2022-11-22 02:30:51,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 41 states have internal predecessors, (46), 10 states have call successors, (10), 4 states have call predecessors, (10), 7 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2022-11-22 02:30:51,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2022-11-22 02:30:51,148 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 20 [2022-11-22 02:30:51,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:51,149 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2022-11-22 02:30:51,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 02:30:51,150 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2022-11-22 02:30:51,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-22 02:30:51,152 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:51,153 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:51,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-22 02:30:51,154 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:51,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:51,155 INFO L85 PathProgramCache]: Analyzing trace with hash 1512584049, now seen corresponding path program 1 times [2022-11-22 02:30:51,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:51,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083076309] [2022-11-22 02:30:51,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:51,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:51,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:51,258 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 02:30:51,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:51,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083076309] [2022-11-22 02:30:51,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1083076309] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:30:51,259 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:30:51,259 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 02:30:51,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088219706] [2022-11-22 02:30:51,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:30:51,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:30:51,260 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:51,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:30:51,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:30:51,261 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-22 02:30:51,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:51,283 INFO L93 Difference]: Finished difference Result 63 states and 78 transitions. [2022-11-22 02:30:51,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 02:30:51,283 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2022-11-22 02:30:51,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:51,289 INFO L225 Difference]: With dead ends: 63 [2022-11-22 02:30:51,289 INFO L226 Difference]: Without dead ends: 54 [2022-11-22 02:30:51,290 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:30:51,291 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:51,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:30:51,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-22 02:30:51,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-11-22 02:30:51,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 39 states have internal predecessors, (44), 10 states have call successors, (10), 4 states have call predecessors, (10), 6 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2022-11-22 02:30:51,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 67 transitions. [2022-11-22 02:30:51,302 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 67 transitions. Word has length 26 [2022-11-22 02:30:51,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:51,303 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 67 transitions. [2022-11-22 02:30:51,303 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-22 02:30:51,303 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 67 transitions. [2022-11-22 02:30:51,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-22 02:30:51,305 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:51,305 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:51,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-22 02:30:51,305 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:51,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:51,306 INFO L85 PathProgramCache]: Analyzing trace with hash -36939295, now seen corresponding path program 1 times [2022-11-22 02:30:51,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:51,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687394454] [2022-11-22 02:30:51,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:51,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:51,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:51,590 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:30:51,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:51,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687394454] [2022-11-22 02:30:51,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [687394454] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:51,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058797277] [2022-11-22 02:30:51,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:51,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:51,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:51,598 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:51,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:30:51,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:51,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 02:30:51,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:51,916 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:30:51,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:52,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:30:52,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058797277] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:30:52,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1173850342] [2022-11-22 02:30:52,295 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-22 02:30:52,296 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:52,300 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:30:52,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:30:52,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 15 [2022-11-22 02:30:52,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692541207] [2022-11-22 02:30:52,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:52,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-22 02:30:52,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:52,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-22 02:30:52,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2022-11-22 02:30:52,308 INFO L87 Difference]: Start difference. First operand 54 states and 67 transitions. Second operand has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-22 02:30:52,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:52,550 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2022-11-22 02:30:52,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 02:30:52,551 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) Word has length 27 [2022-11-22 02:30:52,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:52,552 INFO L225 Difference]: With dead ends: 62 [2022-11-22 02:30:52,552 INFO L226 Difference]: Without dead ends: 54 [2022-11-22 02:30:52,553 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2022-11-22 02:30:52,553 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 24 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:52,554 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 125 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:30:52,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-22 02:30:52,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 48. [2022-11-22 02:30:52,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 34 states have internal predecessors, (40), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:30:52,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2022-11-22 02:30:52,564 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 27 [2022-11-22 02:30:52,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:52,564 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2022-11-22 02:30:52,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-22 02:30:52,565 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2022-11-22 02:30:52,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 02:30:52,566 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:52,566 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:52,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 02:30:52,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:52,777 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:52,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:52,777 INFO L85 PathProgramCache]: Analyzing trace with hash -645776947, now seen corresponding path program 1 times [2022-11-22 02:30:52,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:52,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024152507] [2022-11-22 02:30:52,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:52,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:52,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:52,958 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:30:52,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:52,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024152507] [2022-11-22 02:30:52,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024152507] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:52,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520008602] [2022-11-22 02:30:52,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:52,960 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:52,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:52,961 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:52,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:30:53,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:53,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-22 02:30:53,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:53,142 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:30:53,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:53,491 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-22 02:30:53,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [520008602] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:30:53,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1852118925] [2022-11-22 02:30:53,494 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:30:53,494 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:53,495 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:30:53,495 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:30:53,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 19 [2022-11-22 02:30:53,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759301915] [2022-11-22 02:30:53,496 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:53,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 02:30:53,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:53,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 02:30:53,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=293, Unknown=0, NotChecked=0, Total=342 [2022-11-22 02:30:53,497 INFO L87 Difference]: Start difference. First operand 48 states and 58 transitions. Second operand has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2022-11-22 02:30:53,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:53,750 INFO L93 Difference]: Finished difference Result 73 states and 92 transitions. [2022-11-22 02:30:53,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 02:30:53,754 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) Word has length 28 [2022-11-22 02:30:53,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:53,755 INFO L225 Difference]: With dead ends: 73 [2022-11-22 02:30:53,755 INFO L226 Difference]: Without dead ends: 69 [2022-11-22 02:30:53,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2022-11-22 02:30:53,757 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:53,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 178 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:30:53,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-22 02:30:53,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 58. [2022-11-22 02:30:53,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 40 states have (on average 1.15) internal successors, (46), 41 states have internal predecessors, (46), 10 states have call successors, (10), 4 states have call predecessors, (10), 7 states have return successors, (16), 12 states have call predecessors, (16), 10 states have call successors, (16) [2022-11-22 02:30:53,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2022-11-22 02:30:53,769 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 28 [2022-11-22 02:30:53,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:53,769 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2022-11-22 02:30:53,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2022-11-22 02:30:53,770 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2022-11-22 02:30:53,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 02:30:53,771 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:53,771 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:53,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 02:30:53,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-22 02:30:53,977 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:53,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:53,978 INFO L85 PathProgramCache]: Analyzing trace with hash -1157552339, now seen corresponding path program 1 times [2022-11-22 02:30:53,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:53,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528228832] [2022-11-22 02:30:53,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:53,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:53,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:54,099 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:30:54,099 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:54,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528228832] [2022-11-22 02:30:54,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528228832] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:30:54,100 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:30:54,100 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-11-22 02:30:54,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171006470] [2022-11-22 02:30:54,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:30:54,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 02:30:54,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:54,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 02:30:54,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2022-11-22 02:30:54,101 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-22 02:30:54,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:54,266 INFO L93 Difference]: Finished difference Result 79 states and 99 transitions. [2022-11-22 02:30:54,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 02:30:54,267 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2022-11-22 02:30:54,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:54,268 INFO L225 Difference]: With dead ends: 79 [2022-11-22 02:30:54,268 INFO L226 Difference]: Without dead ends: 75 [2022-11-22 02:30:54,269 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:30:54,271 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 15 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:54,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 120 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:30:54,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-22 02:30:54,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 62. [2022-11-22 02:30:54,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 43 states have internal predecessors, (49), 10 states have call successors, (10), 4 states have call predecessors, (10), 8 states have return successors, (19), 14 states have call predecessors, (19), 10 states have call successors, (19) [2022-11-22 02:30:54,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 78 transitions. [2022-11-22 02:30:54,286 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 78 transitions. Word has length 28 [2022-11-22 02:30:54,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:54,286 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 78 transitions. [2022-11-22 02:30:54,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-22 02:30:54,286 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 78 transitions. [2022-11-22 02:30:54,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-22 02:30:54,287 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:54,288 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 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, 1, 1] [2022-11-22 02:30:54,288 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-22 02:30:54,288 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:54,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:54,288 INFO L85 PathProgramCache]: Analyzing trace with hash -730439667, now seen corresponding path program 1 times [2022-11-22 02:30:54,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:54,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421973121] [2022-11-22 02:30:54,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:54,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:54,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:54,577 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:30:54,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:54,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421973121] [2022-11-22 02:30:54,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421973121] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:54,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949868413] [2022-11-22 02:30:54,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:54,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:54,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:54,579 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:54,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:30:54,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:54,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-22 02:30:54,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:54,786 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 02:30:54,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:55,401 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:30:55,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949868413] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:30:55,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1999621858] [2022-11-22 02:30:55,406 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:30:55,406 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:55,406 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:30:55,407 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:30:55,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 20 [2022-11-22 02:30:55,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028480925] [2022-11-22 02:30:55,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:55,408 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 02:30:55,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:55,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 02:30:55,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2022-11-22 02:30:55,409 INFO L87 Difference]: Start difference. First operand 62 states and 78 transitions. Second operand has 20 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (8), 4 states have call predecessors, (8), 7 states have call successors, (8) [2022-11-22 02:30:55,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:55,776 INFO L93 Difference]: Finished difference Result 88 states and 114 transitions. [2022-11-22 02:30:55,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 02:30:55,776 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (8), 4 states have call predecessors, (8), 7 states have call successors, (8) Word has length 35 [2022-11-22 02:30:55,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:55,777 INFO L225 Difference]: With dead ends: 88 [2022-11-22 02:30:55,777 INFO L226 Difference]: Without dead ends: 84 [2022-11-22 02:30:55,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 56 SyntacticMatches, 7 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2022-11-22 02:30:55,779 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 21 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:55,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 219 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:30:55,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-22 02:30:55,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 72. [2022-11-22 02:30:55,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 50 states have internal predecessors, (55), 11 states have call successors, (11), 4 states have call predecessors, (11), 11 states have return successors, (27), 17 states have call predecessors, (27), 11 states have call successors, (27) [2022-11-22 02:30:55,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 93 transitions. [2022-11-22 02:30:55,797 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 93 transitions. Word has length 35 [2022-11-22 02:30:55,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:55,798 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 93 transitions. [2022-11-22 02:30:55,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (8), 4 states have call predecessors, (8), 7 states have call successors, (8) [2022-11-22 02:30:55,798 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 93 transitions. [2022-11-22 02:30:55,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-22 02:30:55,799 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:55,799 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 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, 1, 1] [2022-11-22 02:30:55,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:30:56,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 02:30:56,000 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:56,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:56,001 INFO L85 PathProgramCache]: Analyzing trace with hash 1412671149, now seen corresponding path program 1 times [2022-11-22 02:30:56,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:56,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244012299] [2022-11-22 02:30:56,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:56,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:56,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:56,284 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:30:56,285 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:56,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244012299] [2022-11-22 02:30:56,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244012299] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:56,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59850318] [2022-11-22 02:30:56,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:56,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:56,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:56,291 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:56,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:30:56,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:56,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-22 02:30:56,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:56,495 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:30:56,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:56,841 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:30:56,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59850318] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:30:56,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [948541261] [2022-11-22 02:30:56,845 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:30:56,845 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:56,845 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:30:56,846 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:30:56,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 16 [2022-11-22 02:30:56,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32337731] [2022-11-22 02:30:56,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:56,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-22 02:30:56,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:56,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-22 02:30:56,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-11-22 02:30:56,849 INFO L87 Difference]: Start difference. First operand 72 states and 93 transitions. Second operand has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 states have internal predecessors, (35), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-22 02:30:57,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:57,077 INFO L93 Difference]: Finished difference Result 83 states and 107 transitions. [2022-11-22 02:30:57,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 02:30:57,077 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 states have internal predecessors, (35), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) Word has length 35 [2022-11-22 02:30:57,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:57,078 INFO L225 Difference]: With dead ends: 83 [2022-11-22 02:30:57,079 INFO L226 Difference]: Without dead ends: 74 [2022-11-22 02:30:57,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 61 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2022-11-22 02:30:57,080 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 24 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:57,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 108 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:30:57,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-22 02:30:57,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2022-11-22 02:30:57,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 48 states have (on average 1.125) internal successors, (54), 50 states have internal predecessors, (54), 11 states have call successors, (11), 4 states have call predecessors, (11), 11 states have return successors, (26), 16 states have call predecessors, (26), 11 states have call successors, (26) [2022-11-22 02:30:57,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 91 transitions. [2022-11-22 02:30:57,091 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 91 transitions. Word has length 35 [2022-11-22 02:30:57,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:57,091 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 91 transitions. [2022-11-22 02:30:57,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 states have internal predecessors, (35), 6 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-22 02:30:57,092 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 91 transitions. [2022-11-22 02:30:57,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 02:30:57,093 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:57,093 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:57,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:30:57,299 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:57,299 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:57,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:57,300 INFO L85 PathProgramCache]: Analyzing trace with hash 1675208857, now seen corresponding path program 1 times [2022-11-22 02:30:57,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:57,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965180491] [2022-11-22 02:30:57,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:57,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:57,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:57,520 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:30:57,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:57,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965180491] [2022-11-22 02:30:57,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965180491] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:57,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614567739] [2022-11-22 02:30:57,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:57,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:57,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:57,522 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:57,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:30:57,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:57,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 02:30:57,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:57,851 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-22 02:30:57,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:58,747 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-22 02:30:58,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614567739] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:30:58,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [535874766] [2022-11-22 02:30:58,749 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:30:58,750 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:58,750 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:30:58,750 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:30:58,750 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 34 [2022-11-22 02:30:58,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129784204] [2022-11-22 02:30:58,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:58,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-22 02:30:58,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:58,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-22 02:30:58,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2022-11-22 02:30:58,752 INFO L87 Difference]: Start difference. First operand 71 states and 91 transitions. Second operand has 34 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (8), 1 states have call predecessors, (8), 8 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2022-11-22 02:30:59,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:59,370 INFO L93 Difference]: Finished difference Result 120 states and 158 transitions. [2022-11-22 02:30:59,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-22 02:30:59,371 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (8), 1 states have call predecessors, (8), 8 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) Word has length 36 [2022-11-22 02:30:59,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:59,372 INFO L225 Difference]: With dead ends: 120 [2022-11-22 02:30:59,372 INFO L226 Difference]: Without dead ends: 116 [2022-11-22 02:30:59,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=247, Invalid=1733, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 02:30:59,374 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 61 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:59,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 279 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:30:59,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-22 02:30:59,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 77. [2022-11-22 02:30:59,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 54 states have internal predecessors, (58), 11 states have call successors, (11), 4 states have call predecessors, (11), 13 states have return successors, (31), 18 states have call predecessors, (31), 11 states have call successors, (31) [2022-11-22 02:30:59,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 100 transitions. [2022-11-22 02:30:59,409 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 100 transitions. Word has length 36 [2022-11-22 02:30:59,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:59,410 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 100 transitions. [2022-11-22 02:30:59,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (8), 1 states have call predecessors, (8), 8 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2022-11-22 02:30:59,410 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 100 transitions. [2022-11-22 02:30:59,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 02:30:59,413 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:59,413 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:59,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 02:30:59,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:59,620 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:59,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:59,620 INFO L85 PathProgramCache]: Analyzing trace with hash 109703257, now seen corresponding path program 2 times [2022-11-22 02:30:59,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:59,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391760052] [2022-11-22 02:30:59,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:59,621 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:59,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:59,779 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:30:59,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:59,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391760052] [2022-11-22 02:30:59,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391760052] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:59,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758766738] [2022-11-22 02:30:59,780 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:30:59,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:59,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:59,782 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:59,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:30:59,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:30:59,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:30:59,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 02:30:59,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:00,101 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 02:31:00,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:01,116 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-22 02:31:01,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758766738] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:01,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [983445392] [2022-11-22 02:31:01,123 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:31:01,123 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:01,123 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:01,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:01,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 15] total 33 [2022-11-22 02:31:01,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412487389] [2022-11-22 02:31:01,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:01,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-22 02:31:01,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:01,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-22 02:31:01,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=959, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 02:31:01,129 INFO L87 Difference]: Start difference. First operand 77 states and 100 transitions. Second operand has 33 states, 30 states have (on average 2.066666666666667) internal successors, (62), 24 states have internal predecessors, (62), 10 states have call successors, (11), 1 states have call predecessors, (11), 8 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-22 02:31:01,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:01,640 INFO L93 Difference]: Finished difference Result 117 states and 155 transitions. [2022-11-22 02:31:01,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 02:31:01,641 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 30 states have (on average 2.066666666666667) internal successors, (62), 24 states have internal predecessors, (62), 10 states have call successors, (11), 1 states have call predecessors, (11), 8 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 36 [2022-11-22 02:31:01,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:01,642 INFO L225 Difference]: With dead ends: 117 [2022-11-22 02:31:01,642 INFO L226 Difference]: Without dead ends: 113 [2022-11-22 02:31:01,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=185, Invalid=1455, Unknown=0, NotChecked=0, Total=1640 [2022-11-22 02:31:01,644 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 54 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 535 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:01,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 214 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 535 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:31:01,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-22 02:31:01,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 86. [2022-11-22 02:31:01,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 58 states have internal predecessors, (65), 11 states have call successors, (11), 4 states have call predecessors, (11), 15 states have return successors, (37), 23 states have call predecessors, (37), 11 states have call successors, (37) [2022-11-22 02:31:01,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 113 transitions. [2022-11-22 02:31:01,656 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 113 transitions. Word has length 36 [2022-11-22 02:31:01,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:01,657 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 113 transitions. [2022-11-22 02:31:01,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 30 states have (on average 2.066666666666667) internal successors, (62), 24 states have internal predecessors, (62), 10 states have call successors, (11), 1 states have call predecessors, (11), 8 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-22 02:31:01,657 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 113 transitions. [2022-11-22 02:31:01,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-22 02:31:01,658 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:01,658 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:01,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:01,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 02:31:01,864 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:01,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:01,865 INFO L85 PathProgramCache]: Analyzing trace with hash -108106833, now seen corresponding path program 2 times [2022-11-22 02:31:01,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:01,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677872545] [2022-11-22 02:31:01,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:01,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:01,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:02,261 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 02:31:02,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:02,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677872545] [2022-11-22 02:31:02,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677872545] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:02,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157376292] [2022-11-22 02:31:02,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:31:02,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:02,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:02,267 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:02,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:31:02,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:31:02,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:02,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 02:31:02,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:02,737 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:31:02,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:03,650 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 02:31:03,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1157376292] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:03,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [671463253] [2022-11-22 02:31:03,653 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:31:03,653 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:03,653 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:03,653 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:03,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 16] total 35 [2022-11-22 02:31:03,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120836291] [2022-11-22 02:31:03,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:03,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 02:31:03,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:03,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 02:31:03,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1089, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 02:31:03,655 INFO L87 Difference]: Start difference. First operand 86 states and 113 transitions. Second operand has 35 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) [2022-11-22 02:31:04,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:04,490 INFO L93 Difference]: Finished difference Result 96 states and 126 transitions. [2022-11-22 02:31:04,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 02:31:04,490 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) Word has length 42 [2022-11-22 02:31:04,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:04,492 INFO L225 Difference]: With dead ends: 96 [2022-11-22 02:31:04,492 INFO L226 Difference]: Without dead ends: 87 [2022-11-22 02:31:04,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 57 SyntacticMatches, 8 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=241, Invalid=1739, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 02:31:04,494 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 63 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:04,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 269 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:31:04,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-22 02:31:04,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 78. [2022-11-22 02:31:04,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 53 states have internal predecessors, (60), 10 states have call successors, (10), 4 states have call predecessors, (10), 13 states have return successors, (31), 20 states have call predecessors, (31), 10 states have call successors, (31) [2022-11-22 02:31:04,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 101 transitions. [2022-11-22 02:31:04,503 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 101 transitions. Word has length 42 [2022-11-22 02:31:04,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:04,503 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 101 transitions. [2022-11-22 02:31:04,503 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (13), 9 states have call predecessors, (13), 12 states have call successors, (13) [2022-11-22 02:31:04,504 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 101 transitions. [2022-11-22 02:31:04,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 02:31:04,504 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:04,505 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 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, 1] [2022-11-22 02:31:04,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-22 02:31:04,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:04,710 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:04,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:04,711 INFO L85 PathProgramCache]: Analyzing trace with hash -1392489715, now seen corresponding path program 3 times [2022-11-22 02:31:04,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:04,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532791445] [2022-11-22 02:31:04,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:04,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:04,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:04,963 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-22 02:31:04,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:04,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532791445] [2022-11-22 02:31:04,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532791445] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:04,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336461504] [2022-11-22 02:31:04,964 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:31:04,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:04,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:04,967 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:05,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:31:05,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:31:05,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:05,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 02:31:05,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:05,390 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-22 02:31:05,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:06,694 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:31:06,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336461504] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:06,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1831104062] [2022-11-22 02:31:06,698 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:31:06,698 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:06,699 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:06,700 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:06,700 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 19] total 35 [2022-11-22 02:31:06,700 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400501493] [2022-11-22 02:31:06,700 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:06,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 02:31:06,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:06,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 02:31:06,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 02:31:06,702 INFO L87 Difference]: Start difference. First operand 78 states and 101 transitions. Second operand has 35 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 25 states have internal predecessors, (55), 9 states have call successors, (9), 1 states have call predecessors, (9), 8 states have return successors, (14), 11 states have call predecessors, (14), 9 states have call successors, (14) [2022-11-22 02:31:07,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:07,448 INFO L93 Difference]: Finished difference Result 123 states and 167 transitions. [2022-11-22 02:31:07,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 02:31:07,448 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 25 states have internal predecessors, (55), 9 states have call successors, (9), 1 states have call predecessors, (9), 8 states have return successors, (14), 11 states have call predecessors, (14), 9 states have call successors, (14) Word has length 44 [2022-11-22 02:31:07,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:07,449 INFO L225 Difference]: With dead ends: 123 [2022-11-22 02:31:07,449 INFO L226 Difference]: Without dead ends: 119 [2022-11-22 02:31:07,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 63 SyntacticMatches, 9 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=324, Invalid=2126, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 02:31:07,451 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 42 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:07,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 274 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:31:07,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-22 02:31:07,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 55. [2022-11-22 02:31:07,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 40 states have internal predecessors, (44), 9 states have call successors, (9), 4 states have call predecessors, (9), 7 states have return successors, (14), 10 states have call predecessors, (14), 9 states have call successors, (14) [2022-11-22 02:31:07,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 67 transitions. [2022-11-22 02:31:07,462 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 67 transitions. Word has length 44 [2022-11-22 02:31:07,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:07,463 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 67 transitions. [2022-11-22 02:31:07,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 25 states have internal predecessors, (55), 9 states have call successors, (9), 1 states have call predecessors, (9), 8 states have return successors, (14), 11 states have call predecessors, (14), 9 states have call successors, (14) [2022-11-22 02:31:07,463 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 67 transitions. [2022-11-22 02:31:07,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-22 02:31:07,464 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:07,464 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:07,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:07,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-22 02:31:07,675 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:07,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:07,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1481032095, now seen corresponding path program 3 times [2022-11-22 02:31:07,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:07,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745752041] [2022-11-22 02:31:07,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:07,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:07,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:07,971 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:31:07,971 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:07,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745752041] [2022-11-22 02:31:07,971 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745752041] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:07,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299321433] [2022-11-22 02:31:07,971 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:31:07,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:07,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:07,975 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:07,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:31:08,068 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:31:08,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:08,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 02:31:08,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:08,241 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 02:31:08,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:09,207 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 02:31:09,207 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299321433] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:09,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1586200717] [2022-11-22 02:31:09,210 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:31:09,211 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:09,211 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:09,212 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:09,212 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 28 [2022-11-22 02:31:09,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947895782] [2022-11-22 02:31:09,213 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:09,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 02:31:09,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:09,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 02:31:09,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=675, Unknown=0, NotChecked=0, Total=756 [2022-11-22 02:31:09,215 INFO L87 Difference]: Start difference. First operand 55 states and 67 transitions. Second operand has 28 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 24 states have internal predecessors, (61), 11 states have call successors, (11), 1 states have call predecessors, (11), 6 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-22 02:31:09,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:09,648 INFO L93 Difference]: Finished difference Result 85 states and 107 transitions. [2022-11-22 02:31:09,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 02:31:09,650 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 24 states have internal predecessors, (61), 11 states have call successors, (11), 1 states have call predecessors, (11), 6 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 43 [2022-11-22 02:31:09,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:09,651 INFO L225 Difference]: With dead ends: 85 [2022-11-22 02:31:09,651 INFO L226 Difference]: Without dead ends: 81 [2022-11-22 02:31:09,652 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=180, Invalid=1080, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 02:31:09,653 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 63 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:09,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 227 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:31:09,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-22 02:31:09,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 66. [2022-11-22 02:31:09,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 47 states have internal predecessors, (51), 10 states have call successors, (10), 4 states have call predecessors, (10), 10 states have return successors, (21), 14 states have call predecessors, (21), 10 states have call successors, (21) [2022-11-22 02:31:09,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 82 transitions. [2022-11-22 02:31:09,667 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 82 transitions. Word has length 43 [2022-11-22 02:31:09,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:09,669 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 82 transitions. [2022-11-22 02:31:09,669 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 24 states have internal predecessors, (61), 11 states have call successors, (11), 1 states have call predecessors, (11), 6 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-22 02:31:09,669 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 82 transitions. [2022-11-22 02:31:09,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-22 02:31:09,670 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:09,670 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:09,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:09,876 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 02:31:09,876 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:09,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:09,877 INFO L85 PathProgramCache]: Analyzing trace with hash -755567679, now seen corresponding path program 1 times [2022-11-22 02:31:09,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:09,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830968349] [2022-11-22 02:31:09,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:09,877 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:09,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:10,175 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:31:10,176 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:10,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830968349] [2022-11-22 02:31:10,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830968349] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:10,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972813181] [2022-11-22 02:31:10,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:10,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:10,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:10,177 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:10,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:31:10,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:10,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-22 02:31:10,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:10,627 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 02:31:10,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:11,744 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-22 02:31:11,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972813181] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:11,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [383015914] [2022-11-22 02:31:11,751 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:31:11,752 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:11,753 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:11,754 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:11,754 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17] total 33 [2022-11-22 02:31:11,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511210559] [2022-11-22 02:31:11,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:11,755 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-22 02:31:11,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:11,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-22 02:31:11,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 02:31:11,756 INFO L87 Difference]: Start difference. First operand 66 states and 82 transitions. Second operand has 33 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 26 states have internal predecessors, (65), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (13), 9 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-22 02:31:12,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:12,493 INFO L93 Difference]: Finished difference Result 111 states and 146 transitions. [2022-11-22 02:31:12,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-22 02:31:12,494 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 26 states have internal predecessors, (65), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (13), 9 states have call predecessors, (13), 11 states have call successors, (13) Word has length 43 [2022-11-22 02:31:12,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:12,495 INFO L225 Difference]: With dead ends: 111 [2022-11-22 02:31:12,495 INFO L226 Difference]: Without dead ends: 107 [2022-11-22 02:31:12,496 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 62 SyntacticMatches, 8 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=259, Invalid=1811, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 02:31:12,497 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 94 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 733 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 429 SdHoareTripleChecker+Invalid, 799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:12,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 429 Invalid, 799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 733 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:31:12,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-11-22 02:31:12,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2022-11-22 02:31:12,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 48 states have (on average 1.125) internal successors, (54), 49 states have internal predecessors, (54), 10 states have call successors, (10), 4 states have call predecessors, (10), 11 states have return successors, (24), 16 states have call predecessors, (24), 10 states have call successors, (24) [2022-11-22 02:31:12,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 88 transitions. [2022-11-22 02:31:12,510 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 88 transitions. Word has length 43 [2022-11-22 02:31:12,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:12,510 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 88 transitions. [2022-11-22 02:31:12,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 26 states have internal predecessors, (65), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (13), 9 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-22 02:31:12,510 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 88 transitions. [2022-11-22 02:31:12,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-22 02:31:12,511 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:12,511 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:12,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:12,717 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 02:31:12,717 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:12,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:12,717 INFO L85 PathProgramCache]: Analyzing trace with hash 647656449, now seen corresponding path program 2 times [2022-11-22 02:31:12,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:12,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102984961] [2022-11-22 02:31:12,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:12,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:12,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:12,960 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:31:12,960 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:12,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102984961] [2022-11-22 02:31:12,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102984961] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:12,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252291342] [2022-11-22 02:31:12,961 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:31:12,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:12,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:12,962 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:12,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:31:13,075 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:31:13,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:13,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-22 02:31:13,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:13,204 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-22 02:31:13,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:13,993 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:31:13,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [252291342] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:13,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [120007952] [2022-11-22 02:31:13,996 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:31:13,996 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:13,997 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:13,998 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:13,998 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14] total 21 [2022-11-22 02:31:13,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900896522] [2022-11-22 02:31:13,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:13,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-22 02:31:13,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:13,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-22 02:31:13,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=366, Unknown=0, NotChecked=0, Total=420 [2022-11-22 02:31:14,000 INFO L87 Difference]: Start difference. First operand 70 states and 88 transitions. Second operand has 21 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-22 02:31:14,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:14,325 INFO L93 Difference]: Finished difference Result 98 states and 125 transitions. [2022-11-22 02:31:14,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 02:31:14,326 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) Word has length 43 [2022-11-22 02:31:14,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:14,328 INFO L225 Difference]: With dead ends: 98 [2022-11-22 02:31:14,328 INFO L226 Difference]: Without dead ends: 94 [2022-11-22 02:31:14,329 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 72 SyntacticMatches, 9 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2022-11-22 02:31:14,329 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 50 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:14,330 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 234 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:31:14,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-22 02:31:14,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 77. [2022-11-22 02:31:14,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 states have internal predecessors, (59), 10 states have call successors, (10), 4 states have call predecessors, (10), 13 states have return successors, (30), 19 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-22 02:31:14,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 99 transitions. [2022-11-22 02:31:14,343 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 99 transitions. Word has length 43 [2022-11-22 02:31:14,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:14,344 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 99 transitions. [2022-11-22 02:31:14,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 7 states have call successors, (9), 1 states have call predecessors, (9), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-22 02:31:14,344 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 99 transitions. [2022-11-22 02:31:14,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-22 02:31:14,345 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:14,345 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 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, 1] [2022-11-22 02:31:14,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:14,551 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 02:31:14,551 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:14,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:14,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1586980819, now seen corresponding path program 3 times [2022-11-22 02:31:14,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:14,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109715769] [2022-11-22 02:31:14,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:14,552 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:14,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:14,842 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 21 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-22 02:31:14,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:14,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109715769] [2022-11-22 02:31:14,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109715769] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:14,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392996232] [2022-11-22 02:31:14,843 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:31:14,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:14,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:14,844 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:14,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 02:31:14,949 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:31:14,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:14,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:31:14,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:15,151 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:31:15,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:16,703 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 7 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:31:16,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392996232] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:16,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [88148146] [2022-11-22 02:31:16,705 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:31:16,706 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:16,707 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:16,708 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:16,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 19] total 31 [2022-11-22 02:31:16,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551421698] [2022-11-22 02:31:16,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:16,709 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-22 02:31:16,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:16,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-22 02:31:16,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=838, Unknown=0, NotChecked=0, Total=930 [2022-11-22 02:31:16,710 INFO L87 Difference]: Start difference. First operand 77 states and 99 transitions. Second operand has 31 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 25 states have internal predecessors, (68), 12 states have call successors, (13), 1 states have call predecessors, (13), 6 states have return successors, (15), 8 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-22 02:31:17,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:17,285 INFO L93 Difference]: Finished difference Result 128 states and 164 transitions. [2022-11-22 02:31:17,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:31:17,286 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 25 states have internal predecessors, (68), 12 states have call successors, (13), 1 states have call predecessors, (13), 6 states have return successors, (15), 8 states have call predecessors, (15), 12 states have call successors, (15) Word has length 51 [2022-11-22 02:31:17,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:17,288 INFO L225 Difference]: With dead ends: 128 [2022-11-22 02:31:17,288 INFO L226 Difference]: Without dead ends: 124 [2022-11-22 02:31:17,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 83 SyntacticMatches, 8 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=227, Invalid=1413, Unknown=0, NotChecked=0, Total=1640 [2022-11-22 02:31:17,292 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 72 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:17,293 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 297 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:31:17,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-22 02:31:17,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 79. [2022-11-22 02:31:17,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 53 states have internal predecessors, (61), 10 states have call successors, (10), 4 states have call predecessors, (10), 13 states have return successors, (30), 21 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-22 02:31:17,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 101 transitions. [2022-11-22 02:31:17,305 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 101 transitions. Word has length 51 [2022-11-22 02:31:17,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:17,305 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 101 transitions. [2022-11-22 02:31:17,306 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 25 states have internal predecessors, (68), 12 states have call successors, (13), 1 states have call predecessors, (13), 6 states have return successors, (15), 8 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-22 02:31:17,306 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 101 transitions. [2022-11-22 02:31:17,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-22 02:31:17,307 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:17,307 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 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, 1] [2022-11-22 02:31:17,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:17,515 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:17,515 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:17,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:17,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1551997235, now seen corresponding path program 4 times [2022-11-22 02:31:17,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:17,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064096529] [2022-11-22 02:31:17,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:17,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:17,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:17,800 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:31:17,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:17,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064096529] [2022-11-22 02:31:17,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064096529] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:17,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734406013] [2022-11-22 02:31:17,800 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:31:17,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:17,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:17,801 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:17,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 02:31:17,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:17,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-22 02:31:17,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:18,266 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-22 02:31:18,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:19,838 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 28 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 02:31:19,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734406013] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:19,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1512055028] [2022-11-22 02:31:19,840 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:31:19,840 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:19,840 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:19,841 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:19,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 20] total 36 [2022-11-22 02:31:19,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231134552] [2022-11-22 02:31:19,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:19,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 02:31:19,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:19,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 02:31:19,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1156, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 02:31:19,858 INFO L87 Difference]: Start difference. First operand 79 states and 101 transitions. Second operand has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 27 states have internal predecessors, (72), 12 states have call successors, (13), 1 states have call predecessors, (13), 9 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2022-11-22 02:31:20,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:20,668 INFO L93 Difference]: Finished difference Result 123 states and 165 transitions. [2022-11-22 02:31:20,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 02:31:20,669 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 27 states have internal predecessors, (72), 12 states have call successors, (13), 1 states have call predecessors, (13), 9 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) Word has length 51 [2022-11-22 02:31:20,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:20,670 INFO L225 Difference]: With dead ends: 123 [2022-11-22 02:31:20,670 INFO L226 Difference]: Without dead ends: 119 [2022-11-22 02:31:20,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 76 SyntacticMatches, 10 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=320, Invalid=2230, Unknown=0, NotChecked=0, Total=2550 [2022-11-22 02:31:20,672 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 56 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 747 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:20,672 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 314 Invalid, 747 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:31:20,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-22 02:31:20,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 58. [2022-11-22 02:31:20,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 40 states have (on average 1.15) internal successors, (46), 42 states have internal predecessors, (46), 9 states have call successors, (9), 4 states have call predecessors, (9), 8 states have return successors, (15), 11 states have call predecessors, (15), 9 states have call successors, (15) [2022-11-22 02:31:20,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2022-11-22 02:31:20,680 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 51 [2022-11-22 02:31:20,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:20,681 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2022-11-22 02:31:20,681 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 27 states have internal predecessors, (72), 12 states have call successors, (13), 1 states have call predecessors, (13), 9 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2022-11-22 02:31:20,681 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2022-11-22 02:31:20,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-22 02:31:20,683 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:20,683 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:20,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:20,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:20,889 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:20,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:20,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1294432549, now seen corresponding path program 4 times [2022-11-22 02:31:20,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:20,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952972671] [2022-11-22 02:31:20,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:20,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:20,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:21,220 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:31:21,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:21,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952972671] [2022-11-22 02:31:21,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952972671] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:21,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816591524] [2022-11-22 02:31:21,221 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:31:21,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:21,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:21,222 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:21,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 02:31:21,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:21,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-22 02:31:21,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:21,595 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-22 02:31:21,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:22,791 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:31:22,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1816591524] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:22,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [474822798] [2022-11-22 02:31:22,793 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:31:22,793 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:22,793 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:22,794 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:22,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 18] total 29 [2022-11-22 02:31:22,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446474978] [2022-11-22 02:31:22,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:22,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-22 02:31:22,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:22,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-22 02:31:22,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=734, Unknown=0, NotChecked=0, Total=812 [2022-11-22 02:31:22,797 INFO L87 Difference]: Start difference. First operand 58 states and 70 transitions. Second operand has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) [2022-11-22 02:31:23,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:23,323 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2022-11-22 02:31:23,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 02:31:23,324 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) Word has length 50 [2022-11-22 02:31:23,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:23,326 INFO L225 Difference]: With dead ends: 88 [2022-11-22 02:31:23,326 INFO L226 Difference]: Without dead ends: 84 [2022-11-22 02:31:23,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 79 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 02:31:23,327 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 54 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:23,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 388 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:31:23,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-22 02:31:23,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 69. [2022-11-22 02:31:23,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 47 states have (on average 1.127659574468085) internal successors, (53), 49 states have internal predecessors, (53), 10 states have call successors, (10), 4 states have call predecessors, (10), 11 states have return successors, (22), 15 states have call predecessors, (22), 10 states have call successors, (22) [2022-11-22 02:31:23,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 85 transitions. [2022-11-22 02:31:23,335 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 85 transitions. Word has length 50 [2022-11-22 02:31:23,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:23,335 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 85 transitions. [2022-11-22 02:31:23,336 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) [2022-11-22 02:31:23,336 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 85 transitions. [2022-11-22 02:31:23,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-22 02:31:23,337 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:23,337 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 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, 1] [2022-11-22 02:31:23,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:23,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:23,543 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:23,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:23,543 INFO L85 PathProgramCache]: Analyzing trace with hash 36046203, now seen corresponding path program 5 times [2022-11-22 02:31:23,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:23,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345589092] [2022-11-22 02:31:23,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:23,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:23,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:23,858 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:31:23,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:23,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345589092] [2022-11-22 02:31:23,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345589092] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:23,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610896352] [2022-11-22 02:31:23,859 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:31:23,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:23,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:23,865 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:23,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 02:31:24,002 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:31:24,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:24,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-22 02:31:24,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:24,240 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-22 02:31:24,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:25,502 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:31:25,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610896352] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:25,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [259326178] [2022-11-22 02:31:25,504 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:31:25,504 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:25,504 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:25,504 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:25,504 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 18] total 29 [2022-11-22 02:31:25,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622185114] [2022-11-22 02:31:25,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:25,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-22 02:31:25,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:25,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-22 02:31:25,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=734, Unknown=0, NotChecked=0, Total=812 [2022-11-22 02:31:25,506 INFO L87 Difference]: Start difference. First operand 69 states and 85 transitions. Second operand has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) [2022-11-22 02:31:25,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:25,986 INFO L93 Difference]: Finished difference Result 96 states and 120 transitions. [2022-11-22 02:31:25,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 02:31:25,987 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) Word has length 50 [2022-11-22 02:31:25,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:25,988 INFO L225 Difference]: With dead ends: 96 [2022-11-22 02:31:25,988 INFO L226 Difference]: Without dead ends: 92 [2022-11-22 02:31:25,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 79 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 02:31:25,989 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 82 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 574 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 398 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:25,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 398 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 574 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:31:25,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-22 02:31:25,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 72. [2022-11-22 02:31:25,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 51 states have internal predecessors, (55), 10 states have call successors, (10), 4 states have call predecessors, (10), 12 states have return successors, (24), 16 states have call predecessors, (24), 10 states have call successors, (24) [2022-11-22 02:31:25,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 89 transitions. [2022-11-22 02:31:25,997 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 89 transitions. Word has length 50 [2022-11-22 02:31:25,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:25,997 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 89 transitions. [2022-11-22 02:31:25,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.5) internal successors, (70), 25 states have internal predecessors, (70), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (14), 7 states have call predecessors, (14), 12 states have call successors, (14) [2022-11-22 02:31:25,998 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 89 transitions. [2022-11-22 02:31:25,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-22 02:31:25,999 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:25,999 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 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, 1] [2022-11-22 02:31:26,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:26,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:26,205 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:26,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:26,205 INFO L85 PathProgramCache]: Analyzing trace with hash 1876802875, now seen corresponding path program 6 times [2022-11-22 02:31:26,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:26,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972719754] [2022-11-22 02:31:26,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:26,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:26,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:26,607 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-22 02:31:26,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:26,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972719754] [2022-11-22 02:31:26,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972719754] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:26,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533810424] [2022-11-22 02:31:26,608 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:31:26,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:26,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:26,610 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:26,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 02:31:26,755 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:31:26,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:26,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:31:26,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:27,153 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 02:31:27,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:28,335 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-22 02:31:28,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533810424] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:28,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1080102922] [2022-11-22 02:31:28,337 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:31:28,337 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:28,337 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:28,337 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:28,337 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 17] total 37 [2022-11-22 02:31:28,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998893426] [2022-11-22 02:31:28,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:28,338 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-22 02:31:28,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:28,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-22 02:31:28,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 02:31:28,339 INFO L87 Difference]: Start difference. First operand 72 states and 89 transitions. Second operand has 37 states, 33 states have (on average 2.272727272727273) internal successors, (75), 31 states have internal predecessors, (75), 12 states have call successors, (15), 1 states have call predecessors, (15), 10 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2022-11-22 02:31:29,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:29,188 INFO L93 Difference]: Finished difference Result 90 states and 114 transitions. [2022-11-22 02:31:29,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 02:31:29,189 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 33 states have (on average 2.272727272727273) internal successors, (75), 31 states have internal predecessors, (75), 12 states have call successors, (15), 1 states have call predecessors, (15), 10 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) Word has length 50 [2022-11-22 02:31:29,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:29,190 INFO L225 Difference]: With dead ends: 90 [2022-11-22 02:31:29,190 INFO L226 Difference]: Without dead ends: 81 [2022-11-22 02:31:29,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 72 SyntacticMatches, 10 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=257, Invalid=1999, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:31:29,192 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 63 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 571 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:29,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 323 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 571 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:31:29,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-22 02:31:29,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 73. [2022-11-22 02:31:29,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 50 states have (on average 1.12) internal successors, (56), 51 states have internal predecessors, (56), 10 states have call successors, (10), 4 states have call predecessors, (10), 12 states have return successors, (24), 17 states have call predecessors, (24), 10 states have call successors, (24) [2022-11-22 02:31:29,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 90 transitions. [2022-11-22 02:31:29,200 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 90 transitions. Word has length 50 [2022-11-22 02:31:29,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:29,200 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 90 transitions. [2022-11-22 02:31:29,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 33 states have (on average 2.272727272727273) internal successors, (75), 31 states have internal predecessors, (75), 12 states have call successors, (15), 1 states have call predecessors, (15), 10 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2022-11-22 02:31:29,200 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 90 transitions. [2022-11-22 02:31:29,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 02:31:29,201 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:29,201 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:29,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:29,407 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-22 02:31:29,407 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:29,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:29,408 INFO L85 PathProgramCache]: Analyzing trace with hash 1448267663, now seen corresponding path program 7 times [2022-11-22 02:31:29,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:29,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813825326] [2022-11-22 02:31:29,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:29,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:29,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:29,784 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-22 02:31:29,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:29,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813825326] [2022-11-22 02:31:29,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813825326] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:29,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955873531] [2022-11-22 02:31:29,785 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:31:29,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:29,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:29,786 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:29,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 02:31:29,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:29,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-22 02:31:29,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:30,214 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 18 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 02:31:30,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:32,007 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-22 02:31:32,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955873531] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:32,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1599148047] [2022-11-22 02:31:32,010 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:31:32,010 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:32,010 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:32,011 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:32,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 19] total 30 [2022-11-22 02:31:32,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008997846] [2022-11-22 02:31:32,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:32,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 02:31:32,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:32,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 02:31:32,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=790, Unknown=0, NotChecked=0, Total=870 [2022-11-22 02:31:32,014 INFO L87 Difference]: Start difference. First operand 73 states and 90 transitions. Second operand has 30 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 25 states have internal predecessors, (73), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) [2022-11-22 02:31:32,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:32,572 INFO L93 Difference]: Finished difference Result 103 states and 128 transitions. [2022-11-22 02:31:32,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 02:31:32,573 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 25 states have internal predecessors, (73), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) Word has length 58 [2022-11-22 02:31:32,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:32,574 INFO L225 Difference]: With dead ends: 103 [2022-11-22 02:31:32,574 INFO L226 Difference]: Without dead ends: 99 [2022-11-22 02:31:32,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 94 SyntacticMatches, 13 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=173, Invalid=1309, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 02:31:32,575 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 69 mSDsluCounter, 411 mSDsCounter, 0 mSdLazyCounter, 660 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 436 SdHoareTripleChecker+Invalid, 685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 660 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:32,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 436 Invalid, 685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 660 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:31:32,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-22 02:31:32,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 80. [2022-11-22 02:31:32,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 55 states have internal predecessors, (61), 10 states have call successors, (10), 4 states have call predecessors, (10), 14 states have return successors, (30), 20 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-22 02:31:32,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 101 transitions. [2022-11-22 02:31:32,588 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 101 transitions. Word has length 58 [2022-11-22 02:31:32,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:32,589 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 101 transitions. [2022-11-22 02:31:32,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 25 states have internal predecessors, (73), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) [2022-11-22 02:31:32,589 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 101 transitions. [2022-11-22 02:31:32,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 02:31:32,590 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:32,590 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:32,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:32,797 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-22 02:31:32,797 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:32,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:32,797 INFO L85 PathProgramCache]: Analyzing trace with hash -189962193, now seen corresponding path program 5 times [2022-11-22 02:31:32,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:32,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190992875] [2022-11-22 02:31:32,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:32,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:32,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:33,209 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 3 proven. 43 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:31:33,209 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:33,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190992875] [2022-11-22 02:31:33,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190992875] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:33,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350535614] [2022-11-22 02:31:33,210 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:31:33,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:33,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:33,211 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:33,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 02:31:33,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:31:33,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:33,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-22 02:31:33,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:33,837 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 10 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-22 02:31:33,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:36,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350535614] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:36,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1184224278] [2022-11-22 02:31:36,378 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:31:36,378 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:36,378 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:31:36,379 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:31:36,379 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 33 [2022-11-22 02:31:36,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028301599] [2022-11-22 02:31:36,380 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:36,380 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-22 02:31:36,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:36,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-22 02:31:36,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1597, Unknown=1, NotChecked=0, Total=1722 [2022-11-22 02:31:36,382 INFO L87 Difference]: Start difference. First operand 80 states and 101 transitions. Second operand has 33 states, 31 states have (on average 2.032258064516129) internal successors, (63), 25 states have internal predecessors, (63), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) [2022-11-22 02:31:37,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:37,166 INFO L93 Difference]: Finished difference Result 109 states and 139 transitions. [2022-11-22 02:31:37,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:31:37,166 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.032258064516129) internal successors, (63), 25 states have internal predecessors, (63), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) Word has length 58 [2022-11-22 02:31:37,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:37,167 INFO L225 Difference]: With dead ends: 109 [2022-11-22 02:31:37,168 INFO L226 Difference]: Without dead ends: 105 [2022-11-22 02:31:37,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=261, Invalid=2494, Unknown=1, NotChecked=0, Total=2756 [2022-11-22 02:31:37,170 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 74 mSDsluCounter, 428 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 847 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:37,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 455 Invalid, 847 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 814 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:31:37,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-11-22 02:31:37,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 83. [2022-11-22 02:31:37,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 57 states have (on average 1.105263157894737) internal successors, (63), 57 states have internal predecessors, (63), 10 states have call successors, (10), 4 states have call predecessors, (10), 15 states have return successors, (33), 21 states have call predecessors, (33), 10 states have call successors, (33) [2022-11-22 02:31:37,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 106 transitions. [2022-11-22 02:31:37,179 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 106 transitions. Word has length 58 [2022-11-22 02:31:37,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:37,180 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 106 transitions. [2022-11-22 02:31:37,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.032258064516129) internal successors, (63), 25 states have internal predecessors, (63), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) [2022-11-22 02:31:37,180 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 106 transitions. [2022-11-22 02:31:37,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 02:31:37,181 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:37,181 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:37,187 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-22 02:31:37,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-22 02:31:37,387 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:37,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:37,387 INFO L85 PathProgramCache]: Analyzing trace with hash 2144331151, now seen corresponding path program 8 times [2022-11-22 02:31:37,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:37,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615525510] [2022-11-22 02:31:37,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:37,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:37,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:37,901 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:31:37,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:37,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615525510] [2022-11-22 02:31:37,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615525510] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:37,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966697129] [2022-11-22 02:31:37,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:31:37,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:37,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:37,907 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:37,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 02:31:38,142 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:31:38,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:38,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-22 02:31:38,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:38,651 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 9 proven. 20 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 02:31:38,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:44,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966697129] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:44,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [678777079] [2022-11-22 02:40:44,796 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:40:44,796 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:44,796 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:40:44,797 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:40:44,798 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18] total 35 [2022-11-22 02:40:44,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093020106] [2022-11-22 02:40:44,798 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:40:44,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 02:40:44,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:44,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 02:40:44,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2032, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 02:40:44,800 INFO L87 Difference]: Start difference. First operand 83 states and 106 transitions. Second operand has 35 states, 32 states have (on average 2.03125) internal successors, (65), 27 states have internal predecessors, (65), 11 states have call successors, (12), 1 states have call predecessors, (12), 11 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) [2022-11-22 02:40:46,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:46,166 INFO L93 Difference]: Finished difference Result 150 states and 200 transitions. [2022-11-22 02:40:46,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-22 02:40:46,167 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 2.03125) internal successors, (65), 27 states have internal predecessors, (65), 11 states have call successors, (12), 1 states have call predecessors, (12), 11 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) Word has length 58 [2022-11-22 02:40:46,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:46,168 INFO L225 Difference]: With dead ends: 150 [2022-11-22 02:40:46,168 INFO L226 Difference]: Without dead ends: 146 [2022-11-22 02:40:46,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=379, Invalid=3781, Unknown=0, NotChecked=0, Total=4160 [2022-11-22 02:40:46,170 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 50 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 1141 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 582 SdHoareTripleChecker+Invalid, 1158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:40:46,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 582 Invalid, 1158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1141 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 02:40:46,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-22 02:40:46,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 95. [2022-11-22 02:40:46,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 65 states have (on average 1.0923076923076922) internal successors, (71), 65 states have internal predecessors, (71), 10 states have call successors, (10), 4 states have call predecessors, (10), 19 states have return successors, (44), 25 states have call predecessors, (44), 10 states have call successors, (44) [2022-11-22 02:40:46,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 125 transitions. [2022-11-22 02:40:46,182 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 125 transitions. Word has length 58 [2022-11-22 02:40:46,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:46,183 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 125 transitions. [2022-11-22 02:40:46,183 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 2.03125) internal successors, (65), 27 states have internal predecessors, (65), 11 states have call successors, (12), 1 states have call predecessors, (12), 11 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) [2022-11-22 02:40:46,183 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 125 transitions. [2022-11-22 02:40:46,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 02:40:46,184 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:46,184 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:46,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-22 02:40:46,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:46,392 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:46,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:46,392 INFO L85 PathProgramCache]: Analyzing trace with hash -512406289, now seen corresponding path program 9 times [2022-11-22 02:40:46,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:46,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524282093] [2022-11-22 02:40:46,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:46,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:46,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:46,779 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-22 02:40:46,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:46,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524282093] [2022-11-22 02:40:46,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [524282093] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:46,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456167615] [2022-11-22 02:40:46,782 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:40:46,782 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:46,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:46,783 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:46,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 02:40:46,981 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:40:46,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:40:46,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-22 02:40:46,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:47,255 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 18 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 02:40:47,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:49,022 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-22 02:40:49,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456167615] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:40:49,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226176222] [2022-11-22 02:40:49,024 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:40:49,024 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:49,025 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:40:49,025 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:40:49,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 19] total 30 [2022-11-22 02:40:49,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885516840] [2022-11-22 02:40:49,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:40:49,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 02:40:49,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:49,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 02:40:49,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=790, Unknown=0, NotChecked=0, Total=870 [2022-11-22 02:40:49,028 INFO L87 Difference]: Start difference. First operand 95 states and 125 transitions. Second operand has 30 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 25 states have internal predecessors, (73), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) [2022-11-22 02:40:49,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:49,544 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2022-11-22 02:40:49,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 02:40:49,545 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 25 states have internal predecessors, (73), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) Word has length 58 [2022-11-22 02:40:49,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:49,546 INFO L225 Difference]: With dead ends: 120 [2022-11-22 02:40:49,546 INFO L226 Difference]: Without dead ends: 116 [2022-11-22 02:40:49,547 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 95 SyntacticMatches, 12 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=173, Invalid=1309, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 02:40:49,547 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 39 mSDsluCounter, 394 mSDsCounter, 0 mSdLazyCounter, 622 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:40:49,547 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 422 Invalid, 630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 622 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:40:49,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-22 02:40:49,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 95. [2022-11-22 02:40:49,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 65 states have (on average 1.0923076923076922) internal successors, (71), 65 states have internal predecessors, (71), 10 states have call successors, (10), 4 states have call predecessors, (10), 19 states have return successors, (44), 25 states have call predecessors, (44), 10 states have call successors, (44) [2022-11-22 02:40:49,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 125 transitions. [2022-11-22 02:40:49,557 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 125 transitions. Word has length 58 [2022-11-22 02:40:49,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:49,558 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 125 transitions. [2022-11-22 02:40:49,558 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 25 states have internal predecessors, (73), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) [2022-11-22 02:40:49,558 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 125 transitions. [2022-11-22 02:40:49,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 02:40:49,559 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:49,559 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:49,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-22 02:40:49,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-22 02:40:49,766 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:49,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:49,766 INFO L85 PathProgramCache]: Analyzing trace with hash 1983911375, now seen corresponding path program 10 times [2022-11-22 02:40:49,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:49,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449956829] [2022-11-22 02:40:49,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:49,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:49,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:50,233 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:40:50,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:50,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449956829] [2022-11-22 02:40:50,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449956829] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:50,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141054718] [2022-11-22 02:40:50,234 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:40:50,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:50,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:50,235 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:50,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 02:40:50,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:50,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-22 02:40:50,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:51,073 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 15 proven. 17 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-22 02:40:51,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:54,018 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 2 proven. 41 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:40:54,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141054718] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:40:54,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1915934727] [2022-11-22 02:40:54,020 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:40:54,020 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:54,020 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:40:54,021 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:40:54,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 18, 22] total 48 [2022-11-22 02:40:54,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607530041] [2022-11-22 02:40:54,022 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:40:54,022 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-22 02:40:54,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:54,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-22 02:40:54,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=2106, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:40:54,024 INFO L87 Difference]: Start difference. First operand 95 states and 125 transitions. Second operand has 48 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 37 states have internal predecessors, (90), 17 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (21), 14 states have call predecessors, (21), 17 states have call successors, (21) [2022-11-22 02:40:55,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:40:55,515 INFO L93 Difference]: Finished difference Result 171 states and 225 transitions. [2022-11-22 02:40:55,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 02:40:55,516 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 37 states have internal predecessors, (90), 17 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (21), 14 states have call predecessors, (21), 17 states have call successors, (21) Word has length 58 [2022-11-22 02:40:55,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:40:55,517 INFO L225 Difference]: With dead ends: 171 [2022-11-22 02:40:55,517 INFO L226 Difference]: Without dead ends: 167 [2022-11-22 02:40:55,518 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 85 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 711 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=425, Invalid=3607, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 02:40:55,519 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 43 mSDsluCounter, 837 mSDsCounter, 0 mSdLazyCounter, 1408 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 872 SdHoareTripleChecker+Invalid, 1436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:40:55,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 872 Invalid, 1436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1408 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 02:40:55,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-11-22 02:40:55,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 107. [2022-11-22 02:40:55,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 74 states have (on average 1.0810810810810811) internal successors, (80), 71 states have internal predecessors, (80), 10 states have call successors, (10), 4 states have call predecessors, (10), 22 states have return successors, (52), 31 states have call predecessors, (52), 10 states have call successors, (52) [2022-11-22 02:40:55,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 142 transitions. [2022-11-22 02:40:55,532 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 142 transitions. Word has length 58 [2022-11-22 02:40:55,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:40:55,533 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 142 transitions. [2022-11-22 02:40:55,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 37 states have internal predecessors, (90), 17 states have call successors, (17), 1 states have call predecessors, (17), 13 states have return successors, (21), 14 states have call predecessors, (21), 17 states have call successors, (21) [2022-11-22 02:40:55,533 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 142 transitions. [2022-11-22 02:40:55,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 02:40:55,534 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:40:55,534 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:40:55,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-22 02:40:55,740 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-22 02:40:55,740 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:40:55,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:40:55,741 INFO L85 PathProgramCache]: Analyzing trace with hash 23237423, now seen corresponding path program 11 times [2022-11-22 02:40:55,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:40:55,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971034572] [2022-11-22 02:40:55,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:40:55,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:40:55,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:40:56,163 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-22 02:40:56,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:40:56,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971034572] [2022-11-22 02:40:56,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971034572] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:56,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849367886] [2022-11-22 02:40:56,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:40:56,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:40:56,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:40:56,165 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:40:56,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 02:40:56,396 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:40:56,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:40:56,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-22 02:40:56,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:40:56,867 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-22 02:40:56,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:40:59,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849367886] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:40:59,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2056103723] [2022-11-22 02:40:59,811 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:40:59,811 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:40:59,811 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:40:59,812 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:40:59,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 33 [2022-11-22 02:40:59,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761416222] [2022-11-22 02:40:59,813 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:40:59,813 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-22 02:40:59,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:40:59,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-22 02:40:59,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1449, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 02:40:59,815 INFO L87 Difference]: Start difference. First operand 107 states and 142 transitions. Second operand has 33 states, 30 states have (on average 2.066666666666667) internal successors, (62), 25 states have internal predecessors, (62), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) [2022-11-22 02:41:00,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:00,819 INFO L93 Difference]: Finished difference Result 159 states and 215 transitions. [2022-11-22 02:41:00,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-22 02:41:00,822 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 30 states have (on average 2.066666666666667) internal successors, (62), 25 states have internal predecessors, (62), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) Word has length 58 [2022-11-22 02:41:00,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:00,824 INFO L225 Difference]: With dead ends: 159 [2022-11-22 02:41:00,824 INFO L226 Difference]: Without dead ends: 155 [2022-11-22 02:41:00,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 65 SyntacticMatches, 5 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=263, Invalid=2707, Unknown=0, NotChecked=0, Total=2970 [2022-11-22 02:41:00,826 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 59 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1028 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 1054 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1028 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:00,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 553 Invalid, 1054 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 1028 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:41:00,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-11-22 02:41:00,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 106. [2022-11-22 02:41:00,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 74 states have (on average 1.0810810810810811) internal successors, (80), 69 states have internal predecessors, (80), 10 states have call successors, (10), 4 states have call predecessors, (10), 21 states have return successors, (49), 32 states have call predecessors, (49), 10 states have call successors, (49) [2022-11-22 02:41:00,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 139 transitions. [2022-11-22 02:41:00,839 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 139 transitions. Word has length 58 [2022-11-22 02:41:00,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:00,839 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 139 transitions. [2022-11-22 02:41:00,840 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 30 states have (on average 2.066666666666667) internal successors, (62), 25 states have internal predecessors, (62), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (14), 11 states have call predecessors, (14), 11 states have call successors, (14) [2022-11-22 02:41:00,840 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 139 transitions. [2022-11-22 02:41:00,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-22 02:41:00,841 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:00,841 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:00,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-22 02:41:01,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-22 02:41:01,047 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:01,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:01,048 INFO L85 PathProgramCache]: Analyzing trace with hash -827028805, now seen corresponding path program 12 times [2022-11-22 02:41:01,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:01,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102777400] [2022-11-22 02:41:01,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:01,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:01,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:01,531 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 5 proven. 54 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-22 02:41:01,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:01,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102777400] [2022-11-22 02:41:01,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102777400] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:01,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251727443] [2022-11-22 02:41:01,532 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:41:01,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:01,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:01,533 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:01,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-22 02:41:01,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:41:01,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:41:01,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-22 02:41:01,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:02,298 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 18 proven. 28 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-22 02:41:02,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:07,499 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 3 proven. 63 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 02:41:07,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251727443] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:41:07,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [879114399] [2022-11-22 02:41:07,501 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:41:07,501 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:07,501 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:41:07,502 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:41:07,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 25] total 55 [2022-11-22 02:41:07,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944506628] [2022-11-22 02:41:07,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:07,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-22 02:41:07,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:07,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-22 02:41:07,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=2807, Unknown=0, NotChecked=0, Total=2970 [2022-11-22 02:41:07,504 INFO L87 Difference]: Start difference. First operand 106 states and 139 transitions. Second operand has 55 states, 50 states have (on average 2.06) internal successors, (103), 40 states have internal predecessors, (103), 19 states have call successors, (20), 1 states have call predecessors, (20), 16 states have return successors, (24), 18 states have call predecessors, (24), 19 states have call successors, (24) [2022-11-22 02:41:08,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:08,944 INFO L93 Difference]: Finished difference Result 163 states and 212 transitions. [2022-11-22 02:41:08,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-22 02:41:08,944 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 50 states have (on average 2.06) internal successors, (103), 40 states have internal predecessors, (103), 19 states have call successors, (20), 1 states have call predecessors, (20), 16 states have return successors, (24), 18 states have call predecessors, (24), 19 states have call successors, (24) Word has length 66 [2022-11-22 02:41:08,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:08,946 INFO L225 Difference]: With dead ends: 163 [2022-11-22 02:41:08,946 INFO L226 Difference]: Without dead ends: 159 [2022-11-22 02:41:08,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 99 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=440, Invalid=4816, Unknown=0, NotChecked=0, Total=5256 [2022-11-22 02:41:08,948 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 105 mSDsluCounter, 688 mSDsCounter, 0 mSdLazyCounter, 1278 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 717 SdHoareTripleChecker+Invalid, 1339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:08,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 717 Invalid, 1339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1278 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:41:08,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-11-22 02:41:08,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 114. [2022-11-22 02:41:08,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 80 states have (on average 1.075) internal successors, (86), 73 states have internal predecessors, (86), 10 states have call successors, (10), 4 states have call predecessors, (10), 23 states have return successors, (55), 36 states have call predecessors, (55), 10 states have call successors, (55) [2022-11-22 02:41:08,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 151 transitions. [2022-11-22 02:41:08,961 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 151 transitions. Word has length 66 [2022-11-22 02:41:08,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:08,961 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 151 transitions. [2022-11-22 02:41:08,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 50 states have (on average 2.06) internal successors, (103), 40 states have internal predecessors, (103), 19 states have call successors, (20), 1 states have call predecessors, (20), 16 states have return successors, (24), 18 states have call predecessors, (24), 19 states have call successors, (24) [2022-11-22 02:41:08,962 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 151 transitions. [2022-11-22 02:41:08,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-22 02:41:08,963 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:08,963 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:08,974 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-11-22 02:41:09,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:09,169 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:09,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:09,170 INFO L85 PathProgramCache]: Analyzing trace with hash -1056647781, now seen corresponding path program 13 times [2022-11-22 02:41:09,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:09,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355526680] [2022-11-22 02:41:09,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:09,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:09,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:09,847 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:41:09,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:09,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355526680] [2022-11-22 02:41:09,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355526680] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:09,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772828744] [2022-11-22 02:41:09,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:41:09,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:09,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:09,849 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:09,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-22 02:41:10,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:10,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-22 02:41:10,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:10,951 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 11 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 02:41:10,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:14,137 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 2 proven. 62 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 02:41:14,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772828744] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:41:14,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [863867026] [2022-11-22 02:41:14,139 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:41:14,139 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:14,139 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:41:14,140 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:41:14,140 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 26] total 58 [2022-11-22 02:41:14,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365620918] [2022-11-22 02:41:14,141 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:14,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-22 02:41:14,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:14,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-22 02:41:14,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 02:41:14,143 INFO L87 Difference]: Start difference. First operand 114 states and 151 transitions. Second operand has 58 states, 51 states have (on average 2.0) internal successors, (102), 45 states have internal predecessors, (102), 18 states have call successors, (18), 1 states have call predecessors, (18), 16 states have return successors, (23), 16 states have call predecessors, (23), 18 states have call successors, (23) [2022-11-22 02:41:15,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:15,670 INFO L93 Difference]: Finished difference Result 186 states and 258 transitions. [2022-11-22 02:41:15,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-22 02:41:15,670 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 51 states have (on average 2.0) internal successors, (102), 45 states have internal predecessors, (102), 18 states have call successors, (18), 1 states have call predecessors, (18), 16 states have return successors, (23), 16 states have call predecessors, (23), 18 states have call successors, (23) Word has length 66 [2022-11-22 02:41:15,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:15,672 INFO L225 Difference]: With dead ends: 186 [2022-11-22 02:41:15,672 INFO L226 Difference]: Without dead ends: 182 [2022-11-22 02:41:15,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 93 SyntacticMatches, 9 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 790 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=471, Invalid=4785, Unknown=0, NotChecked=0, Total=5256 [2022-11-22 02:41:15,674 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 157 mSDsluCounter, 748 mSDsCounter, 0 mSdLazyCounter, 1326 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 779 SdHoareTripleChecker+Invalid, 1427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 1326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:15,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 779 Invalid, 1427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 1326 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 02:41:15,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-11-22 02:41:15,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 118. [2022-11-22 02:41:15,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 82 states have (on average 1.0731707317073171) internal successors, (88), 77 states have internal predecessors, (88), 10 states have call successors, (10), 4 states have call predecessors, (10), 25 states have return successors, (61), 36 states have call predecessors, (61), 10 states have call successors, (61) [2022-11-22 02:41:15,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 159 transitions. [2022-11-22 02:41:15,691 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 159 transitions. Word has length 66 [2022-11-22 02:41:15,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:15,691 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 159 transitions. [2022-11-22 02:41:15,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 51 states have (on average 2.0) internal successors, (102), 45 states have internal predecessors, (102), 18 states have call successors, (18), 1 states have call predecessors, (18), 16 states have return successors, (23), 16 states have call predecessors, (23), 18 states have call successors, (23) [2022-11-22 02:41:15,692 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 159 transitions. [2022-11-22 02:41:15,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-22 02:41:15,693 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:15,693 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:15,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-22 02:41:15,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:15,901 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:15,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:15,901 INFO L85 PathProgramCache]: Analyzing trace with hash 290492763, now seen corresponding path program 14 times [2022-11-22 02:41:15,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:15,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54496067] [2022-11-22 02:41:15,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:15,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:15,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:16,504 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 02:41:16,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:16,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54496067] [2022-11-22 02:41:16,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54496067] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:16,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397932882] [2022-11-22 02:41:16,505 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:41:16,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:16,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:16,506 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:16,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-22 02:41:16,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 02:41:16,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:41:16,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-22 02:41:16,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:17,460 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 18 proven. 27 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 02:41:17,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:20,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397932882] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:20,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1125382321] [2022-11-22 02:41:20,546 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:41:20,547 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:20,547 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:41:20,548 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:41:20,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19] total 37 [2022-11-22 02:41:20,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756835233] [2022-11-22 02:41:20,548 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:20,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-22 02:41:20,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:20,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-22 02:41:20,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1946, Unknown=1, NotChecked=0, Total=2070 [2022-11-22 02:41:20,550 INFO L87 Difference]: Start difference. First operand 118 states and 159 transitions. Second operand has 37 states, 34 states have (on average 2.0) internal successors, (68), 27 states have internal predecessors, (68), 11 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (16), 13 states have call predecessors, (16), 11 states have call successors, (16) [2022-11-22 02:41:22,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:22,205 INFO L93 Difference]: Finished difference Result 212 states and 298 transitions. [2022-11-22 02:41:22,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-22 02:41:22,205 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.0) internal successors, (68), 27 states have internal predecessors, (68), 11 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (16), 13 states have call predecessors, (16), 11 states have call successors, (16) Word has length 66 [2022-11-22 02:41:22,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:22,207 INFO L225 Difference]: With dead ends: 212 [2022-11-22 02:41:22,207 INFO L226 Difference]: Without dead ends: 208 [2022-11-22 02:41:22,208 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=409, Invalid=4146, Unknown=1, NotChecked=0, Total=4556 [2022-11-22 02:41:22,209 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 52 mSDsluCounter, 623 mSDsCounter, 0 mSdLazyCounter, 1337 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 652 SdHoareTripleChecker+Invalid, 1356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:22,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 652 Invalid, 1356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1337 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:41:22,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-11-22 02:41:22,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 124. [2022-11-22 02:41:22,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 86 states have (on average 1.069767441860465) internal successors, (92), 81 states have internal predecessors, (92), 10 states have call successors, (10), 4 states have call predecessors, (10), 27 states have return successors, (67), 38 states have call predecessors, (67), 10 states have call successors, (67) [2022-11-22 02:41:22,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 169 transitions. [2022-11-22 02:41:22,234 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 169 transitions. Word has length 66 [2022-11-22 02:41:22,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:22,234 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 169 transitions. [2022-11-22 02:41:22,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.0) internal successors, (68), 27 states have internal predecessors, (68), 11 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (16), 13 states have call predecessors, (16), 11 states have call successors, (16) [2022-11-22 02:41:22,235 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 169 transitions. [2022-11-22 02:41:22,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-22 02:41:22,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:22,239 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:22,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-22 02:41:22,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:22,446 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:22,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:22,446 INFO L85 PathProgramCache]: Analyzing trace with hash 1523546395, now seen corresponding path program 15 times [2022-11-22 02:41:22,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:22,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215590772] [2022-11-22 02:41:22,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:22,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:22,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:22,948 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-22 02:41:22,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:22,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215590772] [2022-11-22 02:41:22,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215590772] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:22,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754476810] [2022-11-22 02:41:22,949 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:41:22,949 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:22,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:22,951 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:22,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-22 02:41:23,265 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:41:23,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:41:23,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-22 02:41:23,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:23,965 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 24 proven. 24 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-22 02:41:23,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:35,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754476810] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:35,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1388443544] [2022-11-22 02:41:35,928 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:41:35,928 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:35,928 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:41:35,929 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:41:35,929 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 19] total 36 [2022-11-22 02:41:35,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606464713] [2022-11-22 02:41:35,930 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:35,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 02:41:35,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:35,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 02:41:35,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2105, Unknown=4, NotChecked=0, Total=2256 [2022-11-22 02:41:35,931 INFO L87 Difference]: Start difference. First operand 124 states and 169 transitions. Second operand has 36 states, 32 states have (on average 2.0) internal successors, (64), 26 states have internal predecessors, (64), 11 states have call successors, (12), 1 states have call predecessors, (12), 11 states have return successors, (16), 13 states have call predecessors, (16), 11 states have call successors, (16) [2022-11-22 02:41:37,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:37,139 INFO L93 Difference]: Finished difference Result 206 states and 291 transitions. [2022-11-22 02:41:37,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-22 02:41:37,139 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 32 states have (on average 2.0) internal successors, (64), 26 states have internal predecessors, (64), 11 states have call successors, (12), 1 states have call predecessors, (12), 11 states have return successors, (16), 13 states have call predecessors, (16), 11 states have call successors, (16) Word has length 66 [2022-11-22 02:41:37,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:37,141 INFO L225 Difference]: With dead ends: 206 [2022-11-22 02:41:37,141 INFO L226 Difference]: Without dead ends: 202 [2022-11-22 02:41:37,142 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 77 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 612 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=360, Invalid=3418, Unknown=4, NotChecked=0, Total=3782 [2022-11-22 02:41:37,143 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 67 mSDsluCounter, 542 mSDsCounter, 0 mSdLazyCounter, 970 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 1014 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 970 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:37,143 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 570 Invalid, 1014 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 970 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:41:37,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2022-11-22 02:41:37,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 121. [2022-11-22 02:41:37,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 84 states have (on average 1.0714285714285714) internal successors, (90), 79 states have internal predecessors, (90), 10 states have call successors, (10), 4 states have call predecessors, (10), 26 states have return successors, (64), 37 states have call predecessors, (64), 10 states have call successors, (64) [2022-11-22 02:41:37,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 164 transitions. [2022-11-22 02:41:37,159 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 164 transitions. Word has length 66 [2022-11-22 02:41:37,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:37,160 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 164 transitions. [2022-11-22 02:41:37,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 32 states have (on average 2.0) internal successors, (64), 26 states have internal predecessors, (64), 11 states have call successors, (12), 1 states have call predecessors, (12), 11 states have return successors, (16), 13 states have call predecessors, (16), 11 states have call successors, (16) [2022-11-22 02:41:37,160 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 164 transitions. [2022-11-22 02:41:37,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-22 02:41:37,161 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:37,161 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:37,170 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-11-22 02:41:37,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:37,368 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:37,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:37,368 INFO L85 PathProgramCache]: Analyzing trace with hash -1653899333, now seen corresponding path program 16 times [2022-11-22 02:41:37,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:37,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962964128] [2022-11-22 02:41:37,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:37,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:37,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:37,850 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-22 02:41:37,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:37,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962964128] [2022-11-22 02:41:37,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962964128] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:37,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389143554] [2022-11-22 02:41:37,850 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:41:37,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:37,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:37,851 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:37,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-22 02:41:38,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:38,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-22 02:41:38,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:38,684 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-22 02:41:38,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:41,968 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 5 proven. 61 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 02:41:41,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389143554] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:41:41,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [748174133] [2022-11-22 02:41:41,970 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:41:41,970 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:41,970 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:41:41,971 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:41:41,971 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 25] total 45 [2022-11-22 02:41:41,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998459241] [2022-11-22 02:41:41,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:41,972 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-22 02:41:41,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:41,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-22 02:41:41,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1849, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 02:41:41,973 INFO L87 Difference]: Start difference. First operand 121 states and 164 transitions. Second operand has 45 states, 42 states have (on average 2.1904761904761907) internal successors, (92), 34 states have internal predecessors, (92), 16 states have call successors, (17), 1 states have call predecessors, (17), 12 states have return successors, (22), 14 states have call predecessors, (22), 16 states have call successors, (22) [2022-11-22 02:41:43,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:43,412 INFO L93 Difference]: Finished difference Result 180 states and 245 transitions. [2022-11-22 02:41:43,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 02:41:43,413 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 2.1904761904761907) internal successors, (92), 34 states have internal predecessors, (92), 16 states have call successors, (17), 1 states have call predecessors, (17), 12 states have return successors, (22), 14 states have call predecessors, (22), 16 states have call successors, (22) Word has length 66 [2022-11-22 02:41:43,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:43,414 INFO L225 Difference]: With dead ends: 180 [2022-11-22 02:41:43,414 INFO L226 Difference]: Without dead ends: 176 [2022-11-22 02:41:43,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 99 SyntacticMatches, 13 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 794 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=432, Invalid=3474, Unknown=0, NotChecked=0, Total=3906 [2022-11-22 02:41:43,416 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 68 mSDsluCounter, 633 mSDsCounter, 0 mSdLazyCounter, 1321 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 1352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:43,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 666 Invalid, 1352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1321 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 02:41:43,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-11-22 02:41:43,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 62. [2022-11-22 02:41:43,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 44 states have internal predecessors, (49), 9 states have call successors, (9), 4 states have call predecessors, (9), 9 states have return successors, (16), 13 states have call predecessors, (16), 9 states have call successors, (16) [2022-11-22 02:41:43,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 74 transitions. [2022-11-22 02:41:43,427 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 74 transitions. Word has length 66 [2022-11-22 02:41:43,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:43,427 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 74 transitions. [2022-11-22 02:41:43,427 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 42 states have (on average 2.1904761904761907) internal successors, (92), 34 states have internal predecessors, (92), 16 states have call successors, (17), 1 states have call predecessors, (17), 12 states have return successors, (22), 14 states have call predecessors, (22), 16 states have call successors, (22) [2022-11-22 02:41:43,427 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 74 transitions. [2022-11-22 02:41:43,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-22 02:41:43,428 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:43,428 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:43,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-22 02:41:43,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-22 02:41:43,638 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:43,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:43,638 INFO L85 PathProgramCache]: Analyzing trace with hash 810550271, now seen corresponding path program 6 times [2022-11-22 02:41:43,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:43,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603406115] [2022-11-22 02:41:43,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:43,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:43,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:44,174 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:41:44,175 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:44,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603406115] [2022-11-22 02:41:44,175 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603406115] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:44,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50115777] [2022-11-22 02:41:44,176 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:41:44,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:44,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:44,178 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:44,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-22 02:41:44,542 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:41:44,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:41:44,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:41:44,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:45,111 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 02:41:45,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:46,950 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:41:46,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50115777] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:41:46,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1579292789] [2022-11-22 02:41:46,952 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:41:46,952 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:46,952 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:41:46,953 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:41:46,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 21] total 46 [2022-11-22 02:41:46,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751962557] [2022-11-22 02:41:46,954 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:46,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-22 02:41:46,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:46,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-22 02:41:46,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 02:41:46,956 INFO L87 Difference]: Start difference. First operand 62 states and 74 transitions. Second operand has 46 states, 42 states have (on average 2.261904761904762) internal successors, (95), 39 states have internal predecessors, (95), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (19), 14 states have call predecessors, (19), 17 states have call successors, (19) [2022-11-22 02:41:48,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:48,598 INFO L93 Difference]: Finished difference Result 84 states and 104 transitions. [2022-11-22 02:41:48,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 02:41:48,598 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 42 states have (on average 2.261904761904762) internal successors, (95), 39 states have internal predecessors, (95), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (19), 14 states have call predecessors, (19), 17 states have call successors, (19) Word has length 57 [2022-11-22 02:41:48,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:48,599 INFO L225 Difference]: With dead ends: 84 [2022-11-22 02:41:48,599 INFO L226 Difference]: Without dead ends: 75 [2022-11-22 02:41:48,600 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 79 SyntacticMatches, 10 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=347, Invalid=3075, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 02:41:48,601 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 90 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 752 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 802 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:48,601 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 464 Invalid, 802 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 752 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:41:48,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-22 02:41:48,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 65. [2022-11-22 02:41:48,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 46 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 10 states have return successors, (18), 14 states have call predecessors, (18), 9 states have call successors, (18) [2022-11-22 02:41:48,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 02:41:48,611 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 57 [2022-11-22 02:41:48,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:48,611 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 02:41:48,612 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 42 states have (on average 2.261904761904762) internal successors, (95), 39 states have internal predecessors, (95), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (19), 14 states have call predecessors, (19), 17 states have call successors, (19) [2022-11-22 02:41:48,612 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 02:41:48,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-22 02:41:48,613 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:48,613 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:48,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-22 02:41:48,820 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-22 02:41:48,821 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:48,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:48,821 INFO L85 PathProgramCache]: Analyzing trace with hash 1093980511, now seen corresponding path program 17 times [2022-11-22 02:41:48,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:48,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309205300] [2022-11-22 02:41:48,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:48,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:48,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:49,410 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:41:49,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:49,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309205300] [2022-11-22 02:41:49,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309205300] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:49,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713687657] [2022-11-22 02:41:49,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:41:49,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:49,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:49,419 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:49,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-22 02:41:49,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:41:49,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:41:49,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:41:49,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:50,465 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 27 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 02:41:50,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:52,229 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:41:52,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713687657] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:41:52,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020330802] [2022-11-22 02:41:52,230 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:41:52,230 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:52,231 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:41:52,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:41:52,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 21] total 46 [2022-11-22 02:41:52,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065375144] [2022-11-22 02:41:52,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:52,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-22 02:41:52,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:52,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-22 02:41:52,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 02:41:52,234 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 46 states, 42 states have (on average 2.261904761904762) internal successors, (95), 39 states have internal predecessors, (95), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (19), 14 states have call predecessors, (19), 17 states have call successors, (19) [2022-11-22 02:41:53,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:53,614 INFO L93 Difference]: Finished difference Result 88 states and 109 transitions. [2022-11-22 02:41:53,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 02:41:53,615 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 42 states have (on average 2.261904761904762) internal successors, (95), 39 states have internal predecessors, (95), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (19), 14 states have call predecessors, (19), 17 states have call successors, (19) Word has length 57 [2022-11-22 02:41:53,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:53,616 INFO L225 Difference]: With dead ends: 88 [2022-11-22 02:41:53,616 INFO L226 Difference]: Without dead ends: 79 [2022-11-22 02:41:53,617 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 79 SyntacticMatches, 10 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=347, Invalid=3075, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 02:41:53,618 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 73 mSDsluCounter, 493 mSDsCounter, 0 mSdLazyCounter, 839 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 868 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 839 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:53,618 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 520 Invalid, 868 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 839 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:41:53,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-22 02:41:53,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 68. [2022-11-22 02:41:53,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 47 states have (on average 1.127659574468085) internal successors, (53), 48 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 11 states have return successors, (20), 15 states have call predecessors, (20), 9 states have call successors, (20) [2022-11-22 02:41:53,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2022-11-22 02:41:53,628 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 57 [2022-11-22 02:41:53,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:53,628 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2022-11-22 02:41:53,628 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 42 states have (on average 2.261904761904762) internal successors, (95), 39 states have internal predecessors, (95), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (19), 14 states have call predecessors, (19), 17 states have call successors, (19) [2022-11-22 02:41:53,629 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2022-11-22 02:41:53,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-22 02:41:53,630 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:53,630 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:53,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-22 02:41:53,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-22 02:41:53,838 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:53,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:53,838 INFO L85 PathProgramCache]: Analyzing trace with hash -162612181, now seen corresponding path program 7 times [2022-11-22 02:41:53,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:53,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374757030] [2022-11-22 02:41:53,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:53,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:53,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:54,418 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:41:54,418 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:54,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374757030] [2022-11-22 02:41:54,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1374757030] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:54,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503362079] [2022-11-22 02:41:54,418 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:41:54,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:54,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:54,420 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:54,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-22 02:41:54,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:54,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-22 02:41:54,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:55,198 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-22 02:41:55,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:41:57,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503362079] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:57,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [803151475] [2022-11-22 02:41:57,222 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:41:57,222 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:41:57,223 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:41:57,224 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:41:57,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18] total 30 [2022-11-22 02:41:57,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398349560] [2022-11-22 02:41:57,224 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:41:57,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 02:41:57,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:41:57,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 02:41:57,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=1096, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 02:41:57,226 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand has 30 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 24 states have internal predecessors, (63), 10 states have call successors, (10), 1 states have call predecessors, (10), 11 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2022-11-22 02:41:57,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:41:57,953 INFO L93 Difference]: Finished difference Result 100 states and 125 transitions. [2022-11-22 02:41:57,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 02:41:57,954 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 24 states have internal predecessors, (63), 10 states have call successors, (10), 1 states have call predecessors, (10), 11 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) Word has length 65 [2022-11-22 02:41:57,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:41:57,954 INFO L225 Difference]: With dead ends: 100 [2022-11-22 02:41:57,955 INFO L226 Difference]: Without dead ends: 96 [2022-11-22 02:41:57,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 82 SyntacticMatches, 8 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=210, Invalid=1860, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 02:41:57,956 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 70 mSDsluCounter, 442 mSDsCounter, 0 mSdLazyCounter, 696 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 470 SdHoareTripleChecker+Invalid, 722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 696 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:41:57,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 470 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 696 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:41:57,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-22 02:41:57,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 81. [2022-11-22 02:41:57,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 57 states have internal predecessors, (61), 10 states have call successors, (10), 4 states have call predecessors, (10), 15 states have return successors, (29), 19 states have call predecessors, (29), 10 states have call successors, (29) [2022-11-22 02:41:57,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 100 transitions. [2022-11-22 02:41:57,968 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 100 transitions. Word has length 65 [2022-11-22 02:41:57,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:41:57,968 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 100 transitions. [2022-11-22 02:41:57,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 24 states have internal predecessors, (63), 10 states have call successors, (10), 1 states have call predecessors, (10), 11 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2022-11-22 02:41:57,969 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 100 transitions. [2022-11-22 02:41:57,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-22 02:41:57,970 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:41:57,970 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:41:57,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-22 02:41:58,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:58,177 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:41:58,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:41:58,178 INFO L85 PathProgramCache]: Analyzing trace with hash -293058357, now seen corresponding path program 18 times [2022-11-22 02:41:58,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:41:58,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625489905] [2022-11-22 02:41:58,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:41:58,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:41:58,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:41:58,789 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-22 02:41:58,789 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:41:58,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625489905] [2022-11-22 02:41:58,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625489905] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:41:58,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45892840] [2022-11-22 02:41:58,790 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:41:58,790 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:41:58,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:41:58,791 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:41:58,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-22 02:41:59,190 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:41:59,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:41:59,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-22 02:41:59,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:41:59,821 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:41:59,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:42:02,380 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-22 02:42:02,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45892840] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:42:02,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [398582699] [2022-11-22 02:42:02,382 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:42:02,383 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:42:02,383 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:42:02,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:42:02,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 22] total 48 [2022-11-22 02:42:02,385 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106785394] [2022-11-22 02:42:02,385 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:42:02,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-22 02:42:02,386 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:42:02,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-22 02:42:02,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2120, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:42:02,387 INFO L87 Difference]: Start difference. First operand 81 states and 100 transitions. Second operand has 48 states, 44 states have (on average 2.272727272727273) internal successors, (100), 39 states have internal predecessors, (100), 17 states have call successors, (20), 1 states have call predecessors, (20), 14 states have return successors, (22), 16 states have call predecessors, (22), 17 states have call successors, (22) [2022-11-22 02:42:04,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:42:04,016 INFO L93 Difference]: Finished difference Result 99 states and 124 transitions. [2022-11-22 02:42:04,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:42:04,017 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 44 states have (on average 2.272727272727273) internal successors, (100), 39 states have internal predecessors, (100), 17 states have call successors, (20), 1 states have call predecessors, (20), 14 states have return successors, (22), 16 states have call predecessors, (22), 17 states have call successors, (22) Word has length 65 [2022-11-22 02:42:04,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:42:04,018 INFO L225 Difference]: With dead ends: 99 [2022-11-22 02:42:04,018 INFO L226 Difference]: Without dead ends: 90 [2022-11-22 02:42:04,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 93 SyntacticMatches, 13 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=365, Invalid=3417, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 02:42:04,020 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 93 mSDsluCounter, 470 mSDsCounter, 0 mSdLazyCounter, 811 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 863 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 811 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:42:04,020 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 496 Invalid, 863 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 811 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:42:04,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-22 02:42:04,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 81. [2022-11-22 02:42:04,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 57 states have internal predecessors, (61), 10 states have call successors, (10), 4 states have call predecessors, (10), 15 states have return successors, (29), 19 states have call predecessors, (29), 10 states have call successors, (29) [2022-11-22 02:42:04,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 100 transitions. [2022-11-22 02:42:04,032 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 100 transitions. Word has length 65 [2022-11-22 02:42:04,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:42:04,033 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 100 transitions. [2022-11-22 02:42:04,033 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 44 states have (on average 2.272727272727273) internal successors, (100), 39 states have internal predecessors, (100), 17 states have call successors, (20), 1 states have call predecessors, (20), 14 states have return successors, (22), 16 states have call predecessors, (22), 17 states have call successors, (22) [2022-11-22 02:42:04,033 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 100 transitions. [2022-11-22 02:42:04,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-22 02:42:04,034 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:42:04,035 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:42:04,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-22 02:42:04,243 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-22 02:42:04,243 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:42:04,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:42:04,243 INFO L85 PathProgramCache]: Analyzing trace with hash -398036277, now seen corresponding path program 19 times [2022-11-22 02:42:04,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:42:04,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934572185] [2022-11-22 02:42:04,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:42:04,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:42:04,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:04,853 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:42:04,853 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:42:04,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934572185] [2022-11-22 02:42:04,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934572185] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:42:04,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545673435] [2022-11-22 02:42:04,854 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:42:04,854 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:42:04,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:42:04,855 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:42:04,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-22 02:42:05,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:05,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-22 02:42:05,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:42:05,877 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 11 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 02:42:05,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:42:10,884 WARN L837 $PredicateComparison]: unable to prove that (and (< |c_gcd_#res| |c_gcd_#in~y2|) (forall ((|aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| Int) (|aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99_121| Int) (|aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99| Int)) (let ((.cse2 (* 3 |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99_121|))) (let ((.cse1 (* |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 3)) (.cse0 (+ 2 .cse2)) (.cse3 (* 5 |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99|))) (or (< (+ 2 |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99|) |c_gcd_#in~y2|) (< .cse0 .cse1) (< (+ 2 .cse1) .cse2) (< (+ |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99_121| 1) |c_gcd_#in~y1|) (< |c_gcd_#res| (+ |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 2)) (< .cse0 .cse3) (< (+ 4 .cse3) .cse2))))) (< (* 2 |c_gcd_#res|) (+ |c_gcd_#in~y2| 1)) (forall ((|aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48| Int) (|aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| Int) (|aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48_168| Int)) (let ((.cse4 (* 3 |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48|)) (.cse6 (* |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 3)) (.cse5 (* 5 |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48_168|))) (or (< (+ 2 .cse4) 0) (< (+ .cse5 4) (+ .cse4 .cse6)) (< 2 .cse4) (< (+ (* |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 2) (* 2 |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48|) 3) |c_gcd_#in~y2|) (< (+ |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48_168| 1) |c_gcd_#in~y1|) (< |c_gcd_#res| (+ |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 2)) (< (+ 2 .cse6) .cse5)))) (forall ((|aux_div_v_gcd_#in~y2_BEFORE_CALL_55_72| Int) (|aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_48_174| Int) (|aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_48| Int)) (let ((.cse8 (* 5 |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_72|)) (.cse7 (* |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_48_174| 3)) (.cse9 (* 5 |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_48|))) (or (< (+ 3 (* |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_48_174| 2)) |c_gcd_#in~y2|) (< (+ 7 .cse7) .cse8) (< (+ |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_72| |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_48|) |c_gcd_#in~y1|) (< 4 .cse9) (< |c_gcd_#res| (+ |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_72| 1)) (< (+ .cse8 .cse9) (+ .cse7 1)) (< (+ .cse9 4) 0)))) (forall ((|aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48| Int) (|aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| Int) (|aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48_168| Int)) (let ((.cse10 (* 3 |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48|)) (.cse12 (* |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 3)) (.cse11 (* 5 |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48_168|))) (or (< (+ 2 .cse10) 0) (< (+ .cse11 4) (+ .cse10 .cse12)) (< 2 .cse10) (< (+ (* |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 2) (* 2 |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48|) 3) |c_gcd_#in~y2|) (< (+ (* 2 |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_48_168|) 3) |c_gcd_#in~y2|) (< |c_gcd_#res| (+ |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 2)) (< (+ 2 .cse12) .cse11)))) (forall ((|aux_div_v_gcd_#in~y2_BEFORE_CALL_55_72| Int) (|aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_105| Int) (|aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_105_123| Int)) (let ((.cse14 (* 5 |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_72|)) (.cse13 (* 5 |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_105_123|)) (.cse15 (* |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_105| 3))) (or (< (+ |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_105| 1) |c_gcd_#in~y1|) (< (+ 9 .cse13) .cse14) (< |c_gcd_#res| (+ |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_72| 1)) (< (+ |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_72_105_123| 1) |c_gcd_#in~y1|) (< .cse14 (+ .cse13 1)) (< (+ .cse15 2) .cse13) (< (+ 4 .cse13) .cse15)))) (forall ((|aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| Int) (|aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99_121| Int) (|aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99| Int)) (let ((.cse18 (* 3 |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99_121|))) (let ((.cse17 (* |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 3)) (.cse16 (+ 2 .cse18)) (.cse19 (* 5 |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99|))) (or (< .cse16 .cse17) (< (+ |aux_div_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99| 1) |c_gcd_#in~y1|) (< (+ 2 .cse17) .cse18) (< (+ |aux_div_aux_mod_aux_mod_v_gcd_#in~y2_BEFORE_CALL_55_78_99_121| 1) |c_gcd_#in~y1|) (< |c_gcd_#res| (+ |aux_div_v_gcd_#in~y2_BEFORE_CALL_55_78| 2)) (< .cse16 .cse19) (< (+ 4 .cse19) .cse18)))))) is different from false [2022-11-22 02:42:33,676 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [545673435] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:42:33,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [586602647] [2022-11-22 02:42:33,678 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:42:33,678 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:42:33,678 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:42:33,678 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:42:33,678 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19] total 36 [2022-11-22 02:42:33,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39147613] [2022-11-22 02:42:33,679 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:42:33,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 02:42:33,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:42:33,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 02:42:33,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=2387, Unknown=8, NotChecked=98, Total=2652 [2022-11-22 02:42:33,680 INFO L87 Difference]: Start difference. First operand 81 states and 100 transitions. Second operand has 36 states, 34 states have (on average 2.0) internal successors, (68), 28 states have internal predecessors, (68), 11 states have call successors, (12), 1 states have call predecessors, (12), 12 states have return successors, (16), 12 states have call predecessors, (16), 11 states have call successors, (16) [2022-11-22 02:42:35,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:42:35,021 INFO L93 Difference]: Finished difference Result 148 states and 191 transitions. [2022-11-22 02:42:35,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 02:42:35,022 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 2.0) internal successors, (68), 28 states have internal predecessors, (68), 11 states have call successors, (12), 1 states have call predecessors, (12), 12 states have return successors, (16), 12 states have call predecessors, (16), 11 states have call successors, (16) Word has length 65 [2022-11-22 02:42:35,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:42:35,023 INFO L225 Difference]: With dead ends: 148 [2022-11-22 02:42:35,023 INFO L226 Difference]: Without dead ends: 144 [2022-11-22 02:42:35,024 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 78 SyntacticMatches, 4 SemanticMatches, 67 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=422, Invalid=4130, Unknown=8, NotChecked=132, Total=4692 [2022-11-22 02:42:35,025 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 48 mSDsluCounter, 628 mSDsCounter, 0 mSdLazyCounter, 883 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 662 SdHoareTripleChecker+Invalid, 901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 883 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:42:35,025 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 662 Invalid, 901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 883 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:42:35,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-11-22 02:42:35,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 96. [2022-11-22 02:42:35,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 65 states have (on average 1.0923076923076922) internal successors, (71), 67 states have internal predecessors, (71), 10 states have call successors, (10), 4 states have call predecessors, (10), 20 states have return successors, (43), 24 states have call predecessors, (43), 10 states have call successors, (43) [2022-11-22 02:42:35,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 124 transitions. [2022-11-22 02:42:35,037 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 124 transitions. Word has length 65 [2022-11-22 02:42:35,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:42:35,038 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 124 transitions. [2022-11-22 02:42:35,038 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 34 states have (on average 2.0) internal successors, (68), 28 states have internal predecessors, (68), 11 states have call successors, (12), 1 states have call predecessors, (12), 12 states have return successors, (16), 12 states have call predecessors, (16), 11 states have call successors, (16) [2022-11-22 02:42:35,038 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 124 transitions. [2022-11-22 02:42:35,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-22 02:42:35,039 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:42:35,039 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:42:35,055 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-22 02:42:35,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-22 02:42:35,247 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:42:35,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:42:35,247 INFO L85 PathProgramCache]: Analyzing trace with hash -528482453, now seen corresponding path program 20 times [2022-11-22 02:42:35,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:42:35,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128284344] [2022-11-22 02:42:35,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:42:35,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:42:35,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:35,982 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-22 02:42:35,983 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:42:35,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128284344] [2022-11-22 02:42:35,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128284344] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:42:35,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697858914] [2022-11-22 02:42:35,983 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:42:35,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:42:35,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:42:35,984 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:42:35,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-22 02:42:36,419 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:42:36,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:42:36,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-22 02:42:36,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:42:37,126 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:42:37,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:42:39,793 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-22 02:42:39,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697858914] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:42:39,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1564872570] [2022-11-22 02:42:39,795 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:42:39,795 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:42:39,796 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:42:39,797 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:42:39,797 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 22] total 48 [2022-11-22 02:42:39,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131165222] [2022-11-22 02:42:39,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:42:39,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-22 02:42:39,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:42:39,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-22 02:42:39,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2120, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:42:39,798 INFO L87 Difference]: Start difference. First operand 96 states and 124 transitions. Second operand has 48 states, 44 states have (on average 2.272727272727273) internal successors, (100), 39 states have internal predecessors, (100), 17 states have call successors, (20), 1 states have call predecessors, (20), 14 states have return successors, (22), 16 states have call predecessors, (22), 17 states have call successors, (22) [2022-11-22 02:42:41,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:42:41,441 INFO L93 Difference]: Finished difference Result 123 states and 163 transitions. [2022-11-22 02:42:41,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:42:41,441 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 44 states have (on average 2.272727272727273) internal successors, (100), 39 states have internal predecessors, (100), 17 states have call successors, (20), 1 states have call predecessors, (20), 14 states have return successors, (22), 16 states have call predecessors, (22), 17 states have call successors, (22) Word has length 65 [2022-11-22 02:42:41,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:42:41,446 INFO L225 Difference]: With dead ends: 123 [2022-11-22 02:42:41,446 INFO L226 Difference]: Without dead ends: 114 [2022-11-22 02:42:41,447 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 93 SyntacticMatches, 13 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=365, Invalid=3417, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 02:42:41,448 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 58 mSDsluCounter, 556 mSDsCounter, 0 mSdLazyCounter, 954 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 954 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:42:41,449 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 583 Invalid, 976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 954 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:42:41,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-11-22 02:42:41,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 99. [2022-11-22 02:42:41,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 67 states have (on average 1.0895522388059702) internal successors, (73), 69 states have internal predecessors, (73), 10 states have call successors, (10), 4 states have call predecessors, (10), 21 states have return successors, (45), 25 states have call predecessors, (45), 10 states have call successors, (45) [2022-11-22 02:42:41,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 128 transitions. [2022-11-22 02:42:41,464 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 128 transitions. Word has length 65 [2022-11-22 02:42:41,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:42:41,464 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 128 transitions. [2022-11-22 02:42:41,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 44 states have (on average 2.272727272727273) internal successors, (100), 39 states have internal predecessors, (100), 17 states have call successors, (20), 1 states have call predecessors, (20), 14 states have return successors, (22), 16 states have call predecessors, (22), 17 states have call successors, (22) [2022-11-22 02:42:41,465 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 128 transitions. [2022-11-22 02:42:41,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-22 02:42:41,466 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:42:41,466 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:42:41,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-22 02:42:41,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-22 02:42:41,674 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:42:41,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:42:41,674 INFO L85 PathProgramCache]: Analyzing trace with hash 76249739, now seen corresponding path program 21 times [2022-11-22 02:42:41,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:42:41,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424115763] [2022-11-22 02:42:41,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:42:41,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:42:41,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:42,185 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 02:42:42,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:42:42,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424115763] [2022-11-22 02:42:42,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424115763] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:42:42,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729005506] [2022-11-22 02:42:42,186 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:42:42,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:42:42,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:42:42,189 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:42:42,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-22 02:42:42,640 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:42:42,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:42:42,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-22 02:42:42,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:42:43,171 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-11-22 02:42:43,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:42:46,540 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:42:46,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729005506] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:42:46,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1536754803] [2022-11-22 02:42:46,541 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:42:46,541 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:42:46,542 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:42:46,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:42:46,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 24] total 50 [2022-11-22 02:42:46,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885157400] [2022-11-22 02:42:46,543 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:42:46,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-22 02:42:46,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:42:46,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-22 02:42:46,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2309, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 02:42:46,544 INFO L87 Difference]: Start difference. First operand 99 states and 128 transitions. Second operand has 50 states, 45 states have (on average 2.1555555555555554) internal successors, (97), 39 states have internal predecessors, (97), 18 states have call successors, (19), 1 states have call predecessors, (19), 16 states have return successors, (23), 15 states have call predecessors, (23), 18 states have call successors, (23) [2022-11-22 02:42:47,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:42:47,773 INFO L93 Difference]: Finished difference Result 141 states and 186 transitions. [2022-11-22 02:42:47,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-22 02:42:47,775 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 45 states have (on average 2.1555555555555554) internal successors, (97), 39 states have internal predecessors, (97), 18 states have call successors, (19), 1 states have call predecessors, (19), 16 states have return successors, (23), 15 states have call predecessors, (23), 18 states have call successors, (23) Word has length 65 [2022-11-22 02:42:47,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:42:47,776 INFO L225 Difference]: With dead ends: 141 [2022-11-22 02:42:47,776 INFO L226 Difference]: Without dead ends: 137 [2022-11-22 02:42:47,777 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 98 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 525 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=318, Invalid=3714, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 02:42:47,777 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 98 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 1091 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 615 SdHoareTripleChecker+Invalid, 1134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 1091 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:42:47,777 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 615 Invalid, 1134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 1091 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-22 02:42:47,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-11-22 02:42:47,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 106. [2022-11-22 02:42:47,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 72 states have (on average 1.0833333333333333) internal successors, (78), 73 states have internal predecessors, (78), 10 states have call successors, (10), 4 states have call predecessors, (10), 23 states have return successors, (49), 28 states have call predecessors, (49), 10 states have call successors, (49) [2022-11-22 02:42:47,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 137 transitions. [2022-11-22 02:42:47,789 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 137 transitions. Word has length 65 [2022-11-22 02:42:47,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:42:47,789 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 137 transitions. [2022-11-22 02:42:47,790 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 45 states have (on average 2.1555555555555554) internal successors, (97), 39 states have internal predecessors, (97), 18 states have call successors, (19), 1 states have call predecessors, (19), 16 states have return successors, (23), 15 states have call predecessors, (23), 18 states have call successors, (23) [2022-11-22 02:42:47,790 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 137 transitions. [2022-11-22 02:42:47,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-22 02:42:47,791 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:42:47,791 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:42:47,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-22 02:42:47,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2022-11-22 02:42:47,998 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:42:47,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:42:47,998 INFO L85 PathProgramCache]: Analyzing trace with hash -159174357, now seen corresponding path program 22 times [2022-11-22 02:42:47,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:42:47,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821932209] [2022-11-22 02:42:47,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:42:47,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:42:48,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:48,516 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:42:48,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:42:48,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821932209] [2022-11-22 02:42:48,517 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [821932209] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:42:48,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390436961] [2022-11-22 02:42:48,517 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:42:48,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:42:48,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:42:48,519 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:42:48,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-22 02:42:48,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:48,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-22 02:42:48,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:42:49,385 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-22 02:42:49,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:42:52,012 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:42:52,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390436961] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:42:52,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283512577] [2022-11-22 02:42:52,013 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:42:52,013 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:42:52,014 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:42:52,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:42:52,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18, 23] total 38 [2022-11-22 02:42:52,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911507108] [2022-11-22 02:42:52,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:42:52,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-22 02:42:52,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:42:52,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-22 02:42:52,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1302, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 02:42:52,017 INFO L87 Difference]: Start difference. First operand 106 states and 137 transitions. Second operand has 38 states, 37 states have (on average 2.4324324324324325) internal successors, (90), 32 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 11 states have return successors, (20), 10 states have call predecessors, (20), 16 states have call successors, (20) [2022-11-22 02:42:52,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:42:52,718 INFO L93 Difference]: Finished difference Result 134 states and 173 transitions. [2022-11-22 02:42:52,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 02:42:52,719 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 2.4324324324324325) internal successors, (90), 32 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 11 states have return successors, (20), 10 states have call predecessors, (20), 16 states have call successors, (20) Word has length 65 [2022-11-22 02:42:52,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:42:52,720 INFO L225 Difference]: With dead ends: 134 [2022-11-22 02:42:52,720 INFO L226 Difference]: Without dead ends: 130 [2022-11-22 02:42:52,721 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 102 SyntacticMatches, 13 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=241, Invalid=2111, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 02:42:52,721 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 103 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 721 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:42:52,722 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 512 Invalid, 760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 721 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:42:52,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-11-22 02:42:52,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 110. [2022-11-22 02:42:52,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 75 states have (on average 1.08) internal successors, (81), 75 states have internal predecessors, (81), 10 states have call successors, (10), 4 states have call predecessors, (10), 24 states have return successors, (51), 30 states have call predecessors, (51), 10 states have call successors, (51) [2022-11-22 02:42:52,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 142 transitions. [2022-11-22 02:42:52,734 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 142 transitions. Word has length 65 [2022-11-22 02:42:52,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:42:52,734 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 142 transitions. [2022-11-22 02:42:52,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 2.4324324324324325) internal successors, (90), 32 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 11 states have return successors, (20), 10 states have call predecessors, (20), 16 states have call successors, (20) [2022-11-22 02:42:52,735 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 142 transitions. [2022-11-22 02:42:52,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-22 02:42:52,736 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:42:52,736 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:42:52,748 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-11-22 02:42:52,942 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:42:52,943 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:42:52,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:42:52,943 INFO L85 PathProgramCache]: Analyzing trace with hash 1651550335, now seen corresponding path program 8 times [2022-11-22 02:42:52,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:42:52,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120172626] [2022-11-22 02:42:52,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:42:52,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:42:52,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:53,456 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 3 proven. 84 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-22 02:42:53,457 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:42:53,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120172626] [2022-11-22 02:42:53,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120172626] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:42:53,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650915948] [2022-11-22 02:42:53,457 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:42:53,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:42:53,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:42:53,459 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:42:53,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-22 02:42:53,954 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 02:42:53,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:42:53,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-22 02:42:53,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:42:54,489 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 10 proven. 55 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-22 02:42:54,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:42:57,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650915948] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:42:57,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1337702477] [2022-11-22 02:42:57,794 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:42:57,795 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:42:57,795 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:42:57,795 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:42:57,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22] total 37 [2022-11-22 02:42:57,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579099785] [2022-11-22 02:42:57,796 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:42:57,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-22 02:42:57,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:42:57,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-22 02:42:57,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2121, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:42:57,797 INFO L87 Difference]: Start difference. First operand 110 states and 142 transitions. Second operand has 37 states, 36 states have (on average 2.111111111111111) internal successors, (76), 29 states have internal predecessors, (76), 13 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (17), 12 states have call predecessors, (17), 13 states have call successors, (17) [2022-11-22 02:42:59,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:42:59,007 INFO L93 Difference]: Finished difference Result 142 states and 185 transitions. [2022-11-22 02:42:59,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-22 02:42:59,007 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.111111111111111) internal successors, (76), 29 states have internal predecessors, (76), 13 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (17), 12 states have call predecessors, (17), 13 states have call successors, (17) Word has length 73 [2022-11-22 02:42:59,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:42:59,009 INFO L225 Difference]: With dead ends: 142 [2022-11-22 02:42:59,009 INFO L226 Difference]: Without dead ends: 138 [2022-11-22 02:42:59,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 87 SyntacticMatches, 6 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=388, Invalid=3772, Unknown=0, NotChecked=0, Total=4160 [2022-11-22 02:42:59,010 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 90 mSDsluCounter, 607 mSDsCounter, 0 mSdLazyCounter, 1022 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 637 SdHoareTripleChecker+Invalid, 1065 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 1022 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:42:59,010 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 637 Invalid, 1065 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 1022 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:42:59,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-11-22 02:42:59,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 112. [2022-11-22 02:42:59,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 77 states have internal predecessors, (82), 10 states have call successors, (10), 4 states have call predecessors, (10), 25 states have return successors, (54), 30 states have call predecessors, (54), 10 states have call successors, (54) [2022-11-22 02:42:59,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2022-11-22 02:42:59,019 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 73 [2022-11-22 02:42:59,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:42:59,020 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2022-11-22 02:42:59,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.111111111111111) internal successors, (76), 29 states have internal predecessors, (76), 13 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (17), 12 states have call predecessors, (17), 13 states have call successors, (17) [2022-11-22 02:42:59,020 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2022-11-22 02:42:59,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-22 02:42:59,021 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:42:59,021 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:42:59,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-22 02:42:59,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:42:59,228 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:42:59,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:42:59,229 INFO L85 PathProgramCache]: Analyzing trace with hash -847125473, now seen corresponding path program 23 times [2022-11-22 02:42:59,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:42:59,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777659778] [2022-11-22 02:42:59,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:42:59,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:42:59,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:42:59,761 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 02:42:59,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:42:59,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777659778] [2022-11-22 02:42:59,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1777659778] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:42:59,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783927775] [2022-11-22 02:42:59,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:42:59,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:42:59,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:42:59,763 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:42:59,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-22 02:43:00,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 02:43:00,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:43:00,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-22 02:43:00,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:43:00,815 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 18 proven. 36 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-22 02:43:00,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:43:04,550 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 02:43:04,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783927775] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:43:04,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [969147824] [2022-11-22 02:43:04,552 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:43:04,552 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:43:04,552 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:43:04,552 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:43:04,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 24] total 39 [2022-11-22 02:43:04,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702081459] [2022-11-22 02:43:04,553 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:43:04,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-22 02:43:04,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:43:04,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-22 02:43:04,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1376, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 02:43:04,554 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand has 39 states, 38 states have (on average 2.4473684210526314) internal successors, (93), 32 states have internal predecessors, (93), 16 states have call successors, (18), 1 states have call predecessors, (18), 11 states have return successors, (22), 11 states have call predecessors, (22), 16 states have call successors, (22) [2022-11-22 02:43:05,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:43:05,288 INFO L93 Difference]: Finished difference Result 145 states and 189 transitions. [2022-11-22 02:43:05,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:43:05,288 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.4473684210526314) internal successors, (93), 32 states have internal predecessors, (93), 16 states have call successors, (18), 1 states have call predecessors, (18), 11 states have return successors, (22), 11 states have call predecessors, (22), 16 states have call successors, (22) Word has length 73 [2022-11-22 02:43:05,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:43:05,289 INFO L225 Difference]: With dead ends: 145 [2022-11-22 02:43:05,289 INFO L226 Difference]: Without dead ends: 141 [2022-11-22 02:43:05,290 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 117 SyntacticMatches, 16 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=255, Invalid=2295, Unknown=0, NotChecked=0, Total=2550 [2022-11-22 02:43:05,290 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 113 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 691 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 736 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 691 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:43:05,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 496 Invalid, 736 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 691 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:43:05,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-22 02:43:05,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 120. [2022-11-22 02:43:05,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 82 states have (on average 1.0731707317073171) internal successors, (88), 81 states have internal predecessors, (88), 10 states have call successors, (10), 4 states have call predecessors, (10), 27 states have return successors, (60), 34 states have call predecessors, (60), 10 states have call successors, (60) [2022-11-22 02:43:05,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 158 transitions. [2022-11-22 02:43:05,300 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 158 transitions. Word has length 73 [2022-11-22 02:43:05,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:43:05,300 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 158 transitions. [2022-11-22 02:43:05,301 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.4473684210526314) internal successors, (93), 32 states have internal predecessors, (93), 16 states have call successors, (18), 1 states have call predecessors, (18), 11 states have return successors, (22), 11 states have call predecessors, (22), 16 states have call successors, (22) [2022-11-22 02:43:05,301 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 158 transitions. [2022-11-22 02:43:05,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-22 02:43:05,302 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:43:05,302 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:43:05,314 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-11-22 02:43:05,510 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:43:05,510 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:43:05,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:43:05,511 INFO L85 PathProgramCache]: Analyzing trace with hash -1820043297, now seen corresponding path program 24 times [2022-11-22 02:43:05,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:43:05,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223685302] [2022-11-22 02:43:05,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:43:05,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:43:05,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:43:05,994 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 3 proven. 71 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-22 02:43:05,994 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:43:05,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223685302] [2022-11-22 02:43:05,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223685302] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:43:05,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736891630] [2022-11-22 02:43:05,995 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:43:05,995 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:43:05,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:43:05,996 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:43:05,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-22 02:43:06,555 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:43:06,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:43:06,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-22 02:43:06,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:43:07,132 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 18 proven. 41 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-22 02:43:07,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:43:10,851 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 9 proven. 73 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:43:10,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736891630] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:43:10,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [379667912] [2022-11-22 02:43:10,853 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:43:10,853 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:43:10,853 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:43:10,854 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:43:10,854 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 21, 27] total 53 [2022-11-22 02:43:10,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430505265] [2022-11-22 02:43:10,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:43:10,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-22 02:43:10,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:43:10,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-22 02:43:10,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=2585, Unknown=0, NotChecked=0, Total=2756 [2022-11-22 02:43:10,856 INFO L87 Difference]: Start difference. First operand 120 states and 158 transitions. Second operand has 53 states, 49 states have (on average 2.122448979591837) internal successors, (104), 41 states have internal predecessors, (104), 20 states have call successors, (20), 1 states have call predecessors, (20), 15 states have return successors, (27), 16 states have call predecessors, (27), 20 states have call successors, (27) [2022-11-22 02:43:11,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:43:11,960 INFO L93 Difference]: Finished difference Result 171 states and 229 transitions. [2022-11-22 02:43:11,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-22 02:43:11,961 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 49 states have (on average 2.122448979591837) internal successors, (104), 41 states have internal predecessors, (104), 20 states have call successors, (20), 1 states have call predecessors, (20), 15 states have return successors, (27), 16 states have call predecessors, (27), 20 states have call successors, (27) Word has length 73 [2022-11-22 02:43:11,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:43:11,963 INFO L225 Difference]: With dead ends: 171 [2022-11-22 02:43:11,963 INFO L226 Difference]: Without dead ends: 167 [2022-11-22 02:43:11,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 112 SyntacticMatches, 9 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 880 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=401, Invalid=4021, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 02:43:11,988 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 130 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 996 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 1073 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:43:11,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 630 Invalid, 1073 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 996 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:43:11,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-11-22 02:43:12,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 128. [2022-11-22 02:43:12,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 88 states have (on average 1.0681818181818181) internal successors, (94), 85 states have internal predecessors, (94), 10 states have call successors, (10), 4 states have call predecessors, (10), 29 states have return successors, (65), 38 states have call predecessors, (65), 10 states have call successors, (65) [2022-11-22 02:43:12,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 169 transitions. [2022-11-22 02:43:12,004 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 169 transitions. Word has length 73 [2022-11-22 02:43:12,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:43:12,004 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 169 transitions. [2022-11-22 02:43:12,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 49 states have (on average 2.122448979591837) internal successors, (104), 41 states have internal predecessors, (104), 20 states have call successors, (20), 1 states have call predecessors, (20), 15 states have return successors, (27), 16 states have call predecessors, (27), 20 states have call successors, (27) [2022-11-22 02:43:12,004 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 169 transitions. [2022-11-22 02:43:12,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-22 02:43:12,006 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:43:12,006 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:43:12,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-22 02:43:12,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-22 02:43:12,210 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:43:12,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:43:12,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1657692865, now seen corresponding path program 25 times [2022-11-22 02:43:12,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:43:12,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686344910] [2022-11-22 02:43:12,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:43:12,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:43:12,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:43:12,828 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-22 02:43:12,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:43:12,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686344910] [2022-11-22 02:43:12,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686344910] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:43:12,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118178557] [2022-11-22 02:43:12,829 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:43:12,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:43:12,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:43:12,835 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:43:12,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-22 02:43:13,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:43:13,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-22 02:43:13,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:43:14,308 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 14 proven. 38 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-22 02:43:14,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:43:37,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118178557] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:43:37,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1435798912] [2022-11-22 02:43:37,607 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:43:37,607 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:43:37,607 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:43:37,609 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:43:37,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 22] total 43 [2022-11-22 02:43:37,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589405126] [2022-11-22 02:43:37,610 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:43:37,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-22 02:43:37,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:43:37,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-22 02:43:37,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=3124, Unknown=5, NotChecked=0, Total=3306 [2022-11-22 02:43:37,611 INFO L87 Difference]: Start difference. First operand 128 states and 169 transitions. Second operand has 43 states, 37 states have (on average 1.972972972972973) internal successors, (73), 33 states have internal predecessors, (73), 13 states have call successors, (13), 1 states have call predecessors, (13), 14 states have return successors, (18), 14 states have call predecessors, (18), 13 states have call successors, (18) [2022-11-22 02:43:39,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:43:39,165 INFO L93 Difference]: Finished difference Result 194 states and 262 transitions. [2022-11-22 02:43:39,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-22 02:43:39,166 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 37 states have (on average 1.972972972972973) internal successors, (73), 33 states have internal predecessors, (73), 13 states have call successors, (13), 1 states have call predecessors, (13), 14 states have return successors, (18), 14 states have call predecessors, (18), 13 states have call successors, (18) Word has length 73 [2022-11-22 02:43:39,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:43:39,167 INFO L225 Difference]: With dead ends: 194 [2022-11-22 02:43:39,167 INFO L226 Difference]: Without dead ends: 190 [2022-11-22 02:43:39,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 84 SyntacticMatches, 5 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 800 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=449, Invalid=4948, Unknown=5, NotChecked=0, Total=5402 [2022-11-22 02:43:39,168 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 71 mSDsluCounter, 730 mSDsCounter, 0 mSdLazyCounter, 1273 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 763 SdHoareTripleChecker+Invalid, 1319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 1273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:43:39,168 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 763 Invalid, 1319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 1273 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:43:39,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-11-22 02:43:39,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 115. [2022-11-22 02:43:39,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 79 states have (on average 1.0759493670886076) internal successors, (85), 77 states have internal predecessors, (85), 10 states have call successors, (10), 4 states have call predecessors, (10), 25 states have return successors, (54), 33 states have call predecessors, (54), 10 states have call successors, (54) [2022-11-22 02:43:39,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 149 transitions. [2022-11-22 02:43:39,184 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 149 transitions. Word has length 73 [2022-11-22 02:43:39,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:43:39,184 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 149 transitions. [2022-11-22 02:43:39,185 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 37 states have (on average 1.972972972972973) internal successors, (73), 33 states have internal predecessors, (73), 13 states have call successors, (13), 1 states have call predecessors, (13), 14 states have return successors, (18), 14 states have call predecessors, (18), 13 states have call successors, (18) [2022-11-22 02:43:39,185 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 149 transitions. [2022-11-22 02:43:39,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-22 02:43:39,186 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:43:39,186 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:43:39,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-22 02:43:39,415 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-22 02:43:39,415 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:43:39,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:43:39,416 INFO L85 PathProgramCache]: Analyzing trace with hash -684775041, now seen corresponding path program 26 times [2022-11-22 02:43:39,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:43:39,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824899582] [2022-11-22 02:43:39,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:43:39,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:43:39,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:43:39,977 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 02:43:39,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:43:39,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824899582] [2022-11-22 02:43:39,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824899582] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:43:39,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947956934] [2022-11-22 02:43:39,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:43:39,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:43:39,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:43:39,978 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:43:39,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-22 02:43:40,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 02:43:40,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:43:40,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-22 02:43:40,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:43:41,294 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 18 proven. 35 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-22 02:43:41,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:43:45,958 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 3 proven. 77 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:43:45,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947956934] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:43:45,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [754496715] [2022-11-22 02:43:45,960 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:43:45,960 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:43:45,961 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:43:45,962 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:43:45,962 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 27] total 59 [2022-11-22 02:43:45,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027640923] [2022-11-22 02:43:45,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:43:45,963 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-22 02:43:45,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:43:45,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-22 02:43:45,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3255, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 02:43:45,964 INFO L87 Difference]: Start difference. First operand 115 states and 149 transitions. Second operand has 59 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 44 states have internal predecessors, (117), 21 states have call successors, (23), 1 states have call predecessors, (23), 17 states have return successors, (27), 19 states have call predecessors, (27), 21 states have call successors, (27) [2022-11-22 02:43:47,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:43:47,974 INFO L93 Difference]: Finished difference Result 175 states and 230 transitions. [2022-11-22 02:43:47,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 02:43:47,975 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 44 states have internal predecessors, (117), 21 states have call successors, (23), 1 states have call predecessors, (23), 17 states have return successors, (27), 19 states have call predecessors, (27), 21 states have call successors, (27) Word has length 73 [2022-11-22 02:43:47,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:43:47,976 INFO L225 Difference]: With dead ends: 175 [2022-11-22 02:43:47,977 INFO L226 Difference]: Without dead ends: 171 [2022-11-22 02:43:47,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 110 SyntacticMatches, 4 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=466, Invalid=5696, Unknown=0, NotChecked=0, Total=6162 [2022-11-22 02:43:47,978 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 132 mSDsluCounter, 803 mSDsCounter, 0 mSdLazyCounter, 1460 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 833 SdHoareTripleChecker+Invalid, 1521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:43:47,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [141 Valid, 833 Invalid, 1521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1460 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-22 02:43:47,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-11-22 02:43:47,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 118. [2022-11-22 02:43:47,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 81 states have (on average 1.0740740740740742) internal successors, (87), 79 states have internal predecessors, (87), 10 states have call successors, (10), 4 states have call predecessors, (10), 26 states have return successors, (57), 34 states have call predecessors, (57), 10 states have call successors, (57) [2022-11-22 02:43:47,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2022-11-22 02:43:47,994 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 73 [2022-11-22 02:43:47,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:43:47,994 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2022-11-22 02:43:47,995 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 44 states have internal predecessors, (117), 21 states have call successors, (23), 1 states have call predecessors, (23), 17 states have return successors, (27), 19 states have call predecessors, (27), 21 states have call successors, (27) [2022-11-22 02:43:47,995 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2022-11-22 02:43:47,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-22 02:43:47,996 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:43:47,996 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:43:48,006 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-11-22 02:43:48,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-22 02:43:48,203 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:43:48,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:43:48,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1672476225, now seen corresponding path program 27 times [2022-11-22 02:43:48,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:43:48,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044750819] [2022-11-22 02:43:48,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:43:48,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:43:48,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:43:48,667 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 02:43:48,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:43:48,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044750819] [2022-11-22 02:43:48,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044750819] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:43:48,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42865692] [2022-11-22 02:43:48,668 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:43:48,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:43:48,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:43:48,669 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:43:48,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-22 02:43:49,342 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:43:49,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:43:49,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-22 02:43:49,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:43:49,953 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 18 proven. 35 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-22 02:43:49,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:43:54,537 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 3 proven. 77 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:43:54,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42865692] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:43:54,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1233671772] [2022-11-22 02:43:54,539 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:43:54,539 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:43:54,539 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:94) 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:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) 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:336) 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:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) 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) [2022-11-22 02:43:54,539 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:43:54,540 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20, 27] total 55 [2022-11-22 02:43:54,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924720520] [2022-11-22 02:43:54,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:43:54,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-22 02:43:54,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:43:54,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-22 02:43:54,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=2813, Unknown=0, NotChecked=0, Total=2970 [2022-11-22 02:43:54,541 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand has 55 states, 50 states have (on average 2.12) internal successors, (106), 41 states have internal predecessors, (106), 19 states have call successors, (21), 1 states have call predecessors, (21), 17 states have return successors, (26), 18 states have call predecessors, (26), 19 states have call successors, (26) [2022-11-22 02:43:56,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:43:56,066 INFO L93 Difference]: Finished difference Result 170 states and 229 transitions. [2022-11-22 02:43:56,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 02:43:56,066 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 50 states have (on average 2.12) internal successors, (106), 41 states have internal predecessors, (106), 19 states have call successors, (21), 1 states have call predecessors, (21), 17 states have return successors, (26), 18 states have call predecessors, (26), 19 states have call successors, (26) Word has length 73 [2022-11-22 02:43:56,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:43:56,067 INFO L225 Difference]: With dead ends: 170 [2022-11-22 02:43:56,067 INFO L226 Difference]: Without dead ends: 166 [2022-11-22 02:43:56,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 112 SyntacticMatches, 6 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=377, Invalid=4593, Unknown=0, NotChecked=0, Total=4970 [2022-11-22 02:43:56,069 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 137 mSDsluCounter, 653 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 682 SdHoareTripleChecker+Invalid, 1340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:43:56,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 682 Invalid, 1340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 02:43:56,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-11-22 02:43:56,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 122. [2022-11-22 02:43:56,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 84 states have (on average 1.0714285714285714) internal successors, (90), 81 states have internal predecessors, (90), 10 states have call successors, (10), 4 states have call predecessors, (10), 27 states have return successors, (60), 36 states have call predecessors, (60), 10 states have call successors, (60) [2022-11-22 02:43:56,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 160 transitions. [2022-11-22 02:43:56,081 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 160 transitions. Word has length 73 [2022-11-22 02:43:56,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:43:56,081 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 160 transitions. [2022-11-22 02:43:56,082 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 50 states have (on average 2.12) internal successors, (106), 41 states have internal predecessors, (106), 19 states have call successors, (21), 1 states have call predecessors, (21), 17 states have return successors, (26), 18 states have call predecessors, (26), 19 states have call successors, (26) [2022-11-22 02:43:56,082 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 160 transitions. [2022-11-22 02:43:56,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-22 02:43:56,083 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:43:56,083 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:43:56,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-22 02:43:56,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:43:56,284 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:43:56,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:43:56,284 INFO L85 PathProgramCache]: Analyzing trace with hash 826199583, now seen corresponding path program 28 times [2022-11-22 02:43:56,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:43:56,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026909493] [2022-11-22 02:43:56,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:43:56,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:43:56,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:43:57,115 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 82 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:43:57,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:43:57,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026909493] [2022-11-22 02:43:57,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026909493] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:43:57,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804836069] [2022-11-22 02:43:57,116 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:43:57,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:43:57,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:43:57,117 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:43:57,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_346e4e4c-31fd-432a-929a-cfd2ff687779/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-22 02:43:57,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:43:57,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-22 02:43:57,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:43:58,683 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 22 proven. 35 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-22 02:43:58,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:44:38,342 WARN L233 SmtUtils]: Spent 17.84s on a formula simplification. DAG size of input: 136 DAG size of output: 110 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)