./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 38b53e6a 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_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/gcd02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur --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-38b53e6 [2022-11-26 01:01:42,136 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-26 01:01:42,138 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-26 01:01:42,165 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-26 01:01:42,166 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-26 01:01:42,167 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-26 01:01:42,168 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-26 01:01:42,170 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-26 01:01:42,177 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-26 01:01:42,183 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-26 01:01:42,184 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-26 01:01:42,185 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-26 01:01:42,185 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-26 01:01:42,186 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-26 01:01:42,188 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-26 01:01:42,189 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-26 01:01:42,190 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-26 01:01:42,191 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-26 01:01:42,192 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-26 01:01:42,194 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-26 01:01:42,203 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-26 01:01:42,206 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-26 01:01:42,210 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-26 01:01:42,211 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-26 01:01:42,226 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-26 01:01:42,227 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-26 01:01:42,229 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-26 01:01:42,230 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-26 01:01:42,230 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-26 01:01:42,232 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-26 01:01:42,232 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-26 01:01:42,233 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-26 01:01:42,233 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-26 01:01:42,234 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-26 01:01:42,235 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-26 01:01:42,236 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-26 01:01:42,236 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-26 01:01:42,237 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-26 01:01:42,237 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-26 01:01:42,238 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-26 01:01:42,239 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-26 01:01:42,242 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-26 01:01:42,285 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-26 01:01:42,286 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-26 01:01:42,286 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-26 01:01:42,286 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-26 01:01:42,291 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-26 01:01:42,291 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-26 01:01:42,291 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-26 01:01:42,292 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-26 01:01:42,292 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-26 01:01:42,292 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-26 01:01:42,293 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-26 01:01:42,293 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-26 01:01:42,294 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-26 01:01:42,294 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-26 01:01:42,294 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-26 01:01:42,294 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-26 01:01:42,295 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-26 01:01:42,295 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-26 01:01:42,296 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-26 01:01:42,296 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-26 01:01:42,296 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-26 01:01:42,296 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-26 01:01:42,297 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-26 01:01:42,297 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-26 01:01:42,297 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-26 01:01:42,298 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-26 01:01:42,298 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-26 01:01:42,298 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-26 01:01:42,299 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-26 01:01:42,299 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-26 01:01:42,299 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-26 01:01:42,300 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-26 01:01:42,300 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 01:01:42,300 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-26 01:01:42,300 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-26 01:01:42,300 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-26 01:01:42,301 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-26 01:01:42,301 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-26 01:01:42,301 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-26 01:01:42,301 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-26 01:01:42,301 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-26 01:01:42,302 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_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5840bf8cb045a250261e3957017079dce43a53700f7c91e31c16b36d5b980e00 [2022-11-26 01:01:42,580 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-26 01:01:42,615 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-26 01:01:42,617 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-26 01:01:42,619 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-26 01:01:42,619 INFO L275 PluginConnector]: CDTParser initialized [2022-11-26 01:01:42,621 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/recursive/gcd02.c [2022-11-26 01:01:45,652 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-26 01:01:45,845 INFO L351 CDTParser]: Found 1 translation units. [2022-11-26 01:01:45,846 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/sv-benchmarks/c/recursive/gcd02.c [2022-11-26 01:01:45,856 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/data/2ea86821e/27194149f04f4b109e1b6aa4b5f1337b/FLAG2212b70aa [2022-11-26 01:01:45,878 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/data/2ea86821e/27194149f04f4b109e1b6aa4b5f1337b [2022-11-26 01:01:45,884 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-26 01:01:45,887 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-26 01:01:45,892 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-26 01:01:45,893 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-26 01:01:45,897 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-26 01:01:45,898 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 01:01:45" (1/1) ... [2022-11-26 01:01:45,899 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@457f0024 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:45, skipping insertion in model container [2022-11-26 01:01:45,900 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 01:01:45" (1/1) ... [2022-11-26 01:01:45,911 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-26 01:01:45,928 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-26 01:01:46,112 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_17d540c6-dc68-4287-a77a-cd7f30b67d05/sv-benchmarks/c/recursive/gcd02.c[623,636] [2022-11-26 01:01:46,127 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_17d540c6-dc68-4287-a77a-cd7f30b67d05/sv-benchmarks/c/recursive/gcd02.c[1283,1296] [2022-11-26 01:01:46,128 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 01:01:46,140 INFO L203 MainTranslator]: Completed pre-run [2022-11-26 01:01:46,155 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_17d540c6-dc68-4287-a77a-cd7f30b67d05/sv-benchmarks/c/recursive/gcd02.c[623,636] [2022-11-26 01:01:46,161 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_17d540c6-dc68-4287-a77a-cd7f30b67d05/sv-benchmarks/c/recursive/gcd02.c[1283,1296] [2022-11-26 01:01:46,165 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 01:01:46,185 INFO L208 MainTranslator]: Completed translation [2022-11-26 01:01:46,186 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46 WrapperNode [2022-11-26 01:01:46,186 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-26 01:01:46,188 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-26 01:01:46,188 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-26 01:01:46,188 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-26 01:01:46,197 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,210 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,233 INFO L138 Inliner]: procedures = 14, calls = 20, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 45 [2022-11-26 01:01:46,234 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-26 01:01:46,234 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-26 01:01:46,235 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-26 01:01:46,235 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-26 01:01:46,246 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,247 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,259 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,260 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,265 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,272 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,273 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,275 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,277 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-26 01:01:46,283 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-26 01:01:46,284 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-26 01:01:46,284 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-26 01:01:46,285 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (1/1) ... [2022-11-26 01:01:46,293 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 01:01:46,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:01:46,321 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-26 01:01:46,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-26 01:01:46,373 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-26 01:01:46,373 INFO L130 BoogieDeclarations]: Found specification of procedure gcd [2022-11-26 01:01:46,374 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd [2022-11-26 01:01:46,374 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-26 01:01:46,374 INFO L130 BoogieDeclarations]: Found specification of procedure divides [2022-11-26 01:01:46,374 INFO L138 BoogieDeclarations]: Found implementation of procedure divides [2022-11-26 01:01:46,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-26 01:01:46,375 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-26 01:01:46,452 INFO L235 CfgBuilder]: Building ICFG [2022-11-26 01:01:46,455 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-26 01:01:46,713 INFO L276 CfgBuilder]: Performing block encoding [2022-11-26 01:01:46,751 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-26 01:01:46,767 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-26 01:01:46,770 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 01:01:46 BoogieIcfgContainer [2022-11-26 01:01:46,770 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-26 01:01:46,772 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-26 01:01:46,773 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-26 01:01:46,776 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-26 01:01:46,776 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 01:01:45" (1/3) ... [2022-11-26 01:01:46,777 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4352e697 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 01:01:46, skipping insertion in model container [2022-11-26 01:01:46,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 01:01:46" (2/3) ... [2022-11-26 01:01:46,778 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4352e697 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 01:01:46, skipping insertion in model container [2022-11-26 01:01:46,778 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 01:01:46" (3/3) ... [2022-11-26 01:01:46,779 INFO L112 eAbstractionObserver]: Analyzing ICFG gcd02.c [2022-11-26 01:01:46,821 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-26 01:01:46,822 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-26 01:01:46,886 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-26 01:01:46,894 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;@1c548508, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-26 01:01:46,894 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-26 01:01:46,899 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) [2022-11-26 01:01:46,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-26 01:01:46,908 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:46,908 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:01:46,909 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting gcdErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:46,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:46,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1549950046, now seen corresponding path program 1 times [2022-11-26 01:01:46,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:46,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500567058] [2022-11-26 01:01:46,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:46,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:47,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:47,286 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 01:01:47,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:47,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500567058] [2022-11-26 01:01:47,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500567058] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:01:47,288 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:01:47,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-26 01:01:47,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63390783] [2022-11-26 01:01:47,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:01:47,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-26 01:01:47,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:47,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-26 01:01:47,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-26 01:01:47,328 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) [2022-11-26 01:01:47,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:47,470 INFO L93 Difference]: Finished difference Result 73 states and 98 transitions. [2022-11-26 01:01:47,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-26 01:01:47,473 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 [2022-11-26 01:01:47,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:47,480 INFO L225 Difference]: With dead ends: 73 [2022-11-26 01:01:47,480 INFO L226 Difference]: Without dead ends: 40 [2022-11-26 01:01:47,484 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 [2022-11-26 01:01:47,487 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 32 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 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, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 01:01:47,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 101 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 01:01:47,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-26 01:01:47,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-26 01:01:47,528 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) [2022-11-26 01:01:47,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2022-11-26 01:01:47,531 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 8 [2022-11-26 01:01:47,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:47,532 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2022-11-26 01:01:47,532 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) [2022-11-26 01:01:47,532 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2022-11-26 01:01:47,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-26 01:01:47,533 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:47,534 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:01:47,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-26 01:01:47,535 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting gcdErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:47,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:47,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1756513854, now seen corresponding path program 1 times [2022-11-26 01:01:47,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:47,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126311857] [2022-11-26 01:01:47,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:47,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:47,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:47,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 01:01:47,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:47,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126311857] [2022-11-26 01:01:47,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126311857] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:01:47,730 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:01:47,730 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-26 01:01:47,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179444420] [2022-11-26 01:01:47,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:01:47,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-26 01:01:47,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:47,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-26 01:01:47,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-26 01:01:47,739 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) [2022-11-26 01:01:47,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:47,910 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2022-11-26 01:01:47,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-26 01:01:47,911 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 [2022-11-26 01:01:47,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:47,919 INFO L225 Difference]: With dead ends: 58 [2022-11-26 01:01:47,920 INFO L226 Difference]: Without dead ends: 56 [2022-11-26 01:01:47,920 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 [2022-11-26 01:01:47,921 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 16 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 01:01:47,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 134 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 01:01:47,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-26 01:01:47,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2022-11-26 01:01:47,946 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) [2022-11-26 01:01:47,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2022-11-26 01:01:47,948 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 13 [2022-11-26 01:01:47,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:47,949 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2022-11-26 01:01:47,949 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) [2022-11-26 01:01:47,949 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2022-11-26 01:01:47,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-26 01:01:47,950 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:47,950 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:01:47,950 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-26 01:01:47,950 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting gcdErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:47,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:47,951 INFO L85 PathProgramCache]: Analyzing trace with hash 1759343999, now seen corresponding path program 1 times [2022-11-26 01:01:47,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:47,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545246858] [2022-11-26 01:01:47,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:47,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:47,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:48,101 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 01:01:48,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:48,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545246858] [2022-11-26 01:01:48,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545246858] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:01:48,102 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:01:48,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-26 01:01:48,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210889887] [2022-11-26 01:01:48,103 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:01:48,103 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 01:01:48,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:48,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 01:01:48,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-26 01:01:48,105 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) [2022-11-26 01:01:48,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:48,243 INFO L93 Difference]: Finished difference Result 62 states and 82 transitions. [2022-11-26 01:01:48,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-26 01:01:48,244 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 [2022-11-26 01:01:48,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:48,246 INFO L225 Difference]: With dead ends: 62 [2022-11-26 01:01:48,246 INFO L226 Difference]: Without dead ends: 60 [2022-11-26 01:01:48,246 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 [2022-11-26 01:01:48,248 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 21 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 01:01:48,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 137 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 01:01:48,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-26 01:01:48,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 48. [2022-11-26 01:01:48,260 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) [2022-11-26 01:01:48,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 60 transitions. [2022-11-26 01:01:48,261 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 60 transitions. Word has length 13 [2022-11-26 01:01:48,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:48,262 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 60 transitions. [2022-11-26 01:01:48,262 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) [2022-11-26 01:01:48,262 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 60 transitions. [2022-11-26 01:01:48,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-26 01:01:48,263 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:48,264 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 01:01:48,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-26 01:01:48,264 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:48,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:48,265 INFO L85 PathProgramCache]: Analyzing trace with hash 1880095371, now seen corresponding path program 1 times [2022-11-26 01:01:48,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:48,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774267424] [2022-11-26 01:01:48,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:48,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:48,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:48,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 01:01:48,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:48,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774267424] [2022-11-26 01:01:48,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774267424] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:01:48,330 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:01:48,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-26 01:01:48,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796541295] [2022-11-26 01:01:48,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:01:48,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 01:01:48,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:48,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 01:01:48,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-26 01:01:48,333 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) [2022-11-26 01:01:48,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:48,352 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2022-11-26 01:01:48,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-26 01:01:48,353 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 [2022-11-26 01:01:48,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:48,355 INFO L225 Difference]: With dead ends: 54 [2022-11-26 01:01:48,355 INFO L226 Difference]: Without dead ends: 50 [2022-11-26 01:01:48,355 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 [2022-11-26 01:01:48,356 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 [2022-11-26 01:01:48,357 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] [2022-11-26 01:01:48,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-26 01:01:48,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-26 01:01:48,365 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) [2022-11-26 01:01:48,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2022-11-26 01:01:48,366 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 19 [2022-11-26 01:01:48,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:48,367 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2022-11-26 01:01:48,367 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) [2022-11-26 01:01:48,367 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2022-11-26 01:01:48,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-26 01:01:48,368 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:48,368 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] [2022-11-26 01:01:48,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-26 01:01:48,369 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:48,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:48,370 INFO L85 PathProgramCache]: Analyzing trace with hash -1134762375, now seen corresponding path program 1 times [2022-11-26 01:01:48,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:48,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095956831] [2022-11-26 01:01:48,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:48,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:48,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:48,500 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 01:01:48,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:48,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095956831] [2022-11-26 01:01:48,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095956831] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:01:48,501 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:01:48,501 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-26 01:01:48,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868437336] [2022-11-26 01:01:48,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:01:48,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-26 01:01:48,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:48,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-26 01:01:48,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-26 01:01:48,504 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) [2022-11-26 01:01:48,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:48,649 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2022-11-26 01:01:48,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-26 01:01:48,650 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 [2022-11-26 01:01:48,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:48,652 INFO L225 Difference]: With dead ends: 68 [2022-11-26 01:01:48,652 INFO L226 Difference]: Without dead ends: 64 [2022-11-26 01:01:48,652 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-26 01:01:48,653 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 [2022-11-26 01:01:48,654 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] [2022-11-26 01:01:48,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-26 01:01:48,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 56. [2022-11-26 01:01:48,664 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) [2022-11-26 01:01:48,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2022-11-26 01:01:48,666 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 20 [2022-11-26 01:01:48,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:48,666 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2022-11-26 01:01:48,666 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) [2022-11-26 01:01:48,667 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2022-11-26 01:01:48,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-26 01:01:48,668 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:48,668 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] [2022-11-26 01:01:48,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-26 01:01:48,669 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:48,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:48,669 INFO L85 PathProgramCache]: Analyzing trace with hash 1512584049, now seen corresponding path program 1 times [2022-11-26 01:01:48,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:48,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40802214] [2022-11-26 01:01:48,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:48,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:48,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:48,743 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-26 01:01:48,743 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:48,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40802214] [2022-11-26 01:01:48,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40802214] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:01:48,744 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:01:48,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-26 01:01:48,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204119627] [2022-11-26 01:01:48,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:01:48,745 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-26 01:01:48,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:48,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-26 01:01:48,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-26 01:01:48,746 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) [2022-11-26 01:01:48,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:48,767 INFO L93 Difference]: Finished difference Result 63 states and 78 transitions. [2022-11-26 01:01:48,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-26 01:01:48,768 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 [2022-11-26 01:01:48,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:48,772 INFO L225 Difference]: With dead ends: 63 [2022-11-26 01:01:48,772 INFO L226 Difference]: Without dead ends: 54 [2022-11-26 01:01:48,772 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 [2022-11-26 01:01:48,773 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 [2022-11-26 01:01:48,774 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] [2022-11-26 01:01:48,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-26 01:01:48,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-11-26 01:01:48,782 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) [2022-11-26 01:01:48,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 67 transitions. [2022-11-26 01:01:48,783 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 67 transitions. Word has length 26 [2022-11-26 01:01:48,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:48,783 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 67 transitions. [2022-11-26 01:01:48,784 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) [2022-11-26 01:01:48,784 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 67 transitions. [2022-11-26 01:01:48,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-26 01:01:48,785 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:48,785 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] [2022-11-26 01:01:48,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-26 01:01:48,786 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:48,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:48,786 INFO L85 PathProgramCache]: Analyzing trace with hash -36939295, now seen corresponding path program 1 times [2022-11-26 01:01:48,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:48,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526276764] [2022-11-26 01:01:48,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:48,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:48,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:49,122 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-26 01:01:49,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:49,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526276764] [2022-11-26 01:01:49,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526276764] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:01:49,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862544304] [2022-11-26 01:01:49,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:49,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:01:49,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:01:49,127 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:01:49,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-26 01:01:49,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:49,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-26 01:01:49,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:01:49,374 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-26 01:01:49,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:01:49,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-26 01:01:49,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862544304] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:01:49,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1201969030] [2022-11-26 01:01:49,686 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 01:01:49,686 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:01:49,690 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:01:49,700 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:01:49,700 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 15 [2022-11-26 01:01:49,700 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843481490] [2022-11-26 01:01:49,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:01:49,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-26 01:01:49,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:49,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-26 01:01:49,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2022-11-26 01:01:49,703 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) [2022-11-26 01:01:49,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:49,986 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2022-11-26 01:01:49,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-26 01:01:49,987 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 [2022-11-26 01:01:49,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:49,989 INFO L225 Difference]: With dead ends: 62 [2022-11-26 01:01:49,989 INFO L226 Difference]: Without dead ends: 54 [2022-11-26 01:01:49,989 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 [2022-11-26 01:01:49,990 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 21 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 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, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 01:01:49,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 125 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 01:01:49,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-26 01:01:49,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 48. [2022-11-26 01:01:49,998 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) [2022-11-26 01:01:49,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2022-11-26 01:01:49,999 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 27 [2022-11-26 01:01:49,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:49,999 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2022-11-26 01:01:50,000 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) [2022-11-26 01:01:50,000 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2022-11-26 01:01:50,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-26 01:01:50,001 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:50,001 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] [2022-11-26 01:01:50,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-26 01:01:50,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-26 01:01:50,221 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:50,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:50,222 INFO L85 PathProgramCache]: Analyzing trace with hash -645776947, now seen corresponding path program 1 times [2022-11-26 01:01:50,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:50,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039322772] [2022-11-26 01:01:50,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:50,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:50,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:50,409 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-26 01:01:50,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:50,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039322772] [2022-11-26 01:01:50,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039322772] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:01:50,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012741046] [2022-11-26 01:01:50,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:50,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:01:50,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:01:50,412 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:01:50,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-26 01:01:50,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:50,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-26 01:01:50,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:01:50,588 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-26 01:01:50,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:01:50,937 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-26 01:01:50,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012741046] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:01:50,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [420879941] [2022-11-26 01:01:50,942 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-26 01:01:50,942 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:01:50,943 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:01:50,944 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:01:50,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 19 [2022-11-26 01:01:50,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518780085] [2022-11-26 01:01:50,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:01:50,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-26 01:01:50,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:50,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-26 01:01:50,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=293, Unknown=0, NotChecked=0, Total=342 [2022-11-26 01:01:50,947 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) [2022-11-26 01:01:51,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:51,217 INFO L93 Difference]: Finished difference Result 73 states and 92 transitions. [2022-11-26 01:01:51,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-26 01:01:51,218 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 [2022-11-26 01:01:51,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:51,219 INFO L225 Difference]: With dead ends: 73 [2022-11-26 01:01:51,219 INFO L226 Difference]: Without dead ends: 69 [2022-11-26 01:01:51,220 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 [2022-11-26 01:01:51,221 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 32 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 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 [2022-11-26 01:01:51,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 178 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 01:01:51,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-26 01:01:51,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 58. [2022-11-26 01:01:51,251 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) [2022-11-26 01:01:51,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2022-11-26 01:01:51,252 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 28 [2022-11-26 01:01:51,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:51,253 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2022-11-26 01:01:51,253 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) [2022-11-26 01:01:51,253 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2022-11-26 01:01:51,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-26 01:01:51,255 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:51,255 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] [2022-11-26 01:01:51,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-26 01:01:51,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:01:51,462 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:51,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:51,462 INFO L85 PathProgramCache]: Analyzing trace with hash -1157552339, now seen corresponding path program 1 times [2022-11-26 01:01:51,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:51,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216970943] [2022-11-26 01:01:51,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:51,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:51,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:51,641 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-26 01:01:51,641 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:51,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216970943] [2022-11-26 01:01:51,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216970943] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 01:01:51,642 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 01:01:51,642 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-11-26 01:01:51,642 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024549452] [2022-11-26 01:01:51,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 01:01:51,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-26 01:01:51,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:51,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-26 01:01:51,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2022-11-26 01:01:51,644 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) [2022-11-26 01:01:51,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:51,821 INFO L93 Difference]: Finished difference Result 79 states and 99 transitions. [2022-11-26 01:01:51,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-26 01:01:51,823 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 [2022-11-26 01:01:51,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:51,825 INFO L225 Difference]: With dead ends: 79 [2022-11-26 01:01:51,825 INFO L226 Difference]: Without dead ends: 75 [2022-11-26 01:01:51,826 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 [2022-11-26 01:01:51,828 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 [2022-11-26 01:01:51,829 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] [2022-11-26 01:01:51,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-26 01:01:51,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 62. [2022-11-26 01:01:51,854 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) [2022-11-26 01:01:51,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 78 transitions. [2022-11-26 01:01:51,856 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 78 transitions. Word has length 28 [2022-11-26 01:01:51,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:51,856 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 78 transitions. [2022-11-26 01:01:51,857 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) [2022-11-26 01:01:51,857 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 78 transitions. [2022-11-26 01:01:51,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-26 01:01:51,861 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:51,862 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] [2022-11-26 01:01:51,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-26 01:01:51,862 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:51,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:51,863 INFO L85 PathProgramCache]: Analyzing trace with hash -730439667, now seen corresponding path program 1 times [2022-11-26 01:01:51,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:51,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762003540] [2022-11-26 01:01:51,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:51,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:51,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:52,127 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-26 01:01:52,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:52,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762003540] [2022-11-26 01:01:52,128 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762003540] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:01:52,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163597182] [2022-11-26 01:01:52,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:52,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:01:52,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:01:52,130 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:01:52,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-26 01:01:52,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:52,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-26 01:01:52,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:01:52,373 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-26 01:01:52,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:01:53,043 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-26 01:01:53,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163597182] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:01:53,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2058006197] [2022-11-26 01:01:53,048 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:01:53,049 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:01:53,049 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:01:53,050 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:01:53,050 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 20 [2022-11-26 01:01:53,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303368800] [2022-11-26 01:01:53,051 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:01:53,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-26 01:01:53,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:53,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-26 01:01:53,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2022-11-26 01:01:53,055 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) [2022-11-26 01:01:53,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:53,380 INFO L93 Difference]: Finished difference Result 88 states and 114 transitions. [2022-11-26 01:01:53,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-26 01:01:53,380 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 [2022-11-26 01:01:53,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:53,381 INFO L225 Difference]: With dead ends: 88 [2022-11-26 01:01:53,382 INFO L226 Difference]: Without dead ends: 84 [2022-11-26 01:01:53,382 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 [2022-11-26 01:01:53,383 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 19 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 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, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 01:01:53,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 219 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 01:01:53,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-26 01:01:53,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 72. [2022-11-26 01:01:53,393 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) [2022-11-26 01:01:53,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 93 transitions. [2022-11-26 01:01:53,394 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 93 transitions. Word has length 35 [2022-11-26 01:01:53,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:53,394 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 93 transitions. [2022-11-26 01:01:53,394 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) [2022-11-26 01:01:53,395 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 93 transitions. [2022-11-26 01:01:53,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-26 01:01:53,400 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:53,401 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] [2022-11-26 01:01:53,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-26 01:01:53,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-26 01:01:53,607 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:53,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:53,608 INFO L85 PathProgramCache]: Analyzing trace with hash 1412671149, now seen corresponding path program 1 times [2022-11-26 01:01:53,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:53,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657343420] [2022-11-26 01:01:53,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:53,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:53,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:53,891 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:01:53,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:53,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657343420] [2022-11-26 01:01:53,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657343420] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:01:53,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [719889298] [2022-11-26 01:01:53,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:53,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:01:53,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:01:53,896 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:01:53,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-26 01:01:53,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:53,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-26 01:01:53,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:01:54,140 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:01:54,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:01:54,468 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:01:54,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [719889298] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:01:54,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [412031959] [2022-11-26 01:01:54,470 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:01:54,470 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:01:54,471 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:01:54,471 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:01:54,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 16 [2022-11-26 01:01:54,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358194635] [2022-11-26 01:01:54,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:01:54,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-26 01:01:54,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:54,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-26 01:01:54,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-11-26 01:01:54,473 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) [2022-11-26 01:01:54,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:54,708 INFO L93 Difference]: Finished difference Result 83 states and 107 transitions. [2022-11-26 01:01:54,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-26 01:01:54,708 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 [2022-11-26 01:01:54,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:54,709 INFO L225 Difference]: With dead ends: 83 [2022-11-26 01:01:54,709 INFO L226 Difference]: Without dead ends: 74 [2022-11-26 01:01:54,710 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 [2022-11-26 01:01:54,710 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 18 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 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 [2022-11-26 01:01:54,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 108 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 01:01:54,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-26 01:01:54,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2022-11-26 01:01:54,722 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) [2022-11-26 01:01:54,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 91 transitions. [2022-11-26 01:01:54,723 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 91 transitions. Word has length 35 [2022-11-26 01:01:54,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:54,724 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 91 transitions. [2022-11-26 01:01:54,724 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) [2022-11-26 01:01:54,724 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 91 transitions. [2022-11-26 01:01:54,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-26 01:01:54,725 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:54,725 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] [2022-11-26 01:01:54,731 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-26 01:01:54,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:01:54,931 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:54,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:54,931 INFO L85 PathProgramCache]: Analyzing trace with hash 1675208857, now seen corresponding path program 1 times [2022-11-26 01:01:54,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:54,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766598125] [2022-11-26 01:01:54,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:54,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:54,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:55,173 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-26 01:01:55,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:55,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766598125] [2022-11-26 01:01:55,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766598125] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:01:55,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774953798] [2022-11-26 01:01:55,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:55,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:01:55,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:01:55,175 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:01:55,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-26 01:01:55,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:55,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-26 01:01:55,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:01:55,571 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-26 01:01:55,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:01:56,446 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-26 01:01:56,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1774953798] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:01:56,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [410828129] [2022-11-26 01:01:56,449 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:01:56,449 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:01:56,450 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:01:56,450 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:01:56,450 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 34 [2022-11-26 01:01:56,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478744850] [2022-11-26 01:01:56,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:01:56,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-26 01:01:56,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:56,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-26 01:01:56,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2022-11-26 01:01:56,453 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) [2022-11-26 01:01:57,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:57,214 INFO L93 Difference]: Finished difference Result 120 states and 158 transitions. [2022-11-26 01:01:57,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-26 01:01:57,215 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 [2022-11-26 01:01:57,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:57,216 INFO L225 Difference]: With dead ends: 120 [2022-11-26 01:01:57,217 INFO L226 Difference]: Without dead ends: 116 [2022-11-26 01:01:57,218 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 [2022-11-26 01:01:57,218 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 59 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 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 [2022-11-26 01:01:57,219 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 279 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:01:57,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-26 01:01:57,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 77. [2022-11-26 01:01:57,234 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) [2022-11-26 01:01:57,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 100 transitions. [2022-11-26 01:01:57,236 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 100 transitions. Word has length 36 [2022-11-26 01:01:57,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:57,236 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 100 transitions. [2022-11-26 01:01:57,237 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) [2022-11-26 01:01:57,237 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 100 transitions. [2022-11-26 01:01:57,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-26 01:01:57,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:57,239 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] [2022-11-26 01:01:57,246 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-26 01:01:57,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:01:57,446 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:57,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:57,446 INFO L85 PathProgramCache]: Analyzing trace with hash 109703257, now seen corresponding path program 2 times [2022-11-26 01:01:57,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:57,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572756097] [2022-11-26 01:01:57,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:57,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:57,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:01:57,637 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:01:57,637 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:01:57,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572756097] [2022-11-26 01:01:57,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572756097] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:01:57,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253553410] [2022-11-26 01:01:57,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:01:57,638 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:01:57,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:01:57,639 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:01:57,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-26 01:01:57,715 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-26 01:01:57,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:01:57,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-26 01:01:57,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:01:57,977 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-26 01:01:57,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:01:59,022 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-26 01:01:59,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253553410] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:01:59,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1660308238] [2022-11-26 01:01:59,025 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:01:59,025 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:01:59,025 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:01:59,027 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:01:59,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 15] total 33 [2022-11-26 01:01:59,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573819108] [2022-11-26 01:01:59,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:01:59,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-26 01:01:59,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:01:59,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-26 01:01:59,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=959, Unknown=0, NotChecked=0, Total=1056 [2022-11-26 01:01:59,030 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) [2022-11-26 01:01:59,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:01:59,590 INFO L93 Difference]: Finished difference Result 117 states and 155 transitions. [2022-11-26 01:01:59,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-26 01:01:59,594 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 [2022-11-26 01:01:59,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:01:59,595 INFO L225 Difference]: With dead ends: 117 [2022-11-26 01:01:59,595 INFO L226 Difference]: Without dead ends: 113 [2022-11-26 01:01:59,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=185, Invalid=1455, Unknown=0, NotChecked=0, Total=1640 [2022-11-26 01:01:59,597 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 52 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 535 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 01:01:59,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 214 Invalid, 564 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 535 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 01:01:59,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-26 01:01:59,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 86. [2022-11-26 01:01:59,606 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) [2022-11-26 01:01:59,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 113 transitions. [2022-11-26 01:01:59,610 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 113 transitions. Word has length 36 [2022-11-26 01:01:59,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:01:59,610 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 113 transitions. [2022-11-26 01:01:59,611 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) [2022-11-26 01:01:59,611 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 113 transitions. [2022-11-26 01:01:59,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-26 01:01:59,612 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:01:59,612 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] [2022-11-26 01:01:59,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-26 01:01:59,824 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-26 01:01:59,825 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:01:59,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:01:59,825 INFO L85 PathProgramCache]: Analyzing trace with hash -108106833, now seen corresponding path program 2 times [2022-11-26 01:01:59,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:01:59,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990970771] [2022-11-26 01:01:59,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:01:59,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:01:59,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:00,265 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-26 01:02:00,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:00,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990970771] [2022-11-26 01:02:00,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [990970771] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:00,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832124500] [2022-11-26 01:02:00,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:02:00,266 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:00,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:00,268 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:00,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-26 01:02:00,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-26 01:02:00,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:02:00,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-26 01:02:00,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:00,758 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:02:00,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:01,709 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-26 01:02:01,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832124500] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:01,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1359050668] [2022-11-26 01:02:01,712 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:02:01,712 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:01,712 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:01,713 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:01,713 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 16] total 35 [2022-11-26 01:02:01,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488489134] [2022-11-26 01:02:01,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:01,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-26 01:02:01,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:01,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-26 01:02:01,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1089, Unknown=0, NotChecked=0, Total=1190 [2022-11-26 01:02:01,715 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) [2022-11-26 01:02:02,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:02,576 INFO L93 Difference]: Finished difference Result 96 states and 126 transitions. [2022-11-26 01:02:02,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-26 01:02:02,577 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 [2022-11-26 01:02:02,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:02,578 INFO L225 Difference]: With dead ends: 96 [2022-11-26 01:02:02,578 INFO L226 Difference]: Without dead ends: 87 [2022-11-26 01:02:02,579 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 [2022-11-26 01:02:02,580 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 61 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 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, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 01:02:02,580 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 269 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:02:02,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-26 01:02:02,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 78. [2022-11-26 01:02:02,588 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) [2022-11-26 01:02:02,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 101 transitions. [2022-11-26 01:02:02,589 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 101 transitions. Word has length 42 [2022-11-26 01:02:02,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:02,589 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 101 transitions. [2022-11-26 01:02:02,589 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) [2022-11-26 01:02:02,589 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 101 transitions. [2022-11-26 01:02:02,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-26 01:02:02,590 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:02,590 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] [2022-11-26 01:02:02,600 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-26 01:02:02,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-26 01:02:02,796 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:02,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:02,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1392489715, now seen corresponding path program 3 times [2022-11-26 01:02:02,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:02,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542647683] [2022-11-26 01:02:02,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:02,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:02,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:03,095 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-26 01:02:03,095 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:03,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542647683] [2022-11-26 01:02:03,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1542647683] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:03,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139133390] [2022-11-26 01:02:03,095 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:02:03,096 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:03,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:03,100 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:03,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-26 01:02:03,183 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:02:03,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:02:03,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-26 01:02:03,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:03,487 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 01:02:03,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:04,936 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:02:04,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139133390] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:04,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1796973090] [2022-11-26 01:02:04,938 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:02:04,938 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:04,939 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:04,939 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:04,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 19] total 35 [2022-11-26 01:02:04,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775062700] [2022-11-26 01:02:04,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:04,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-26 01:02:04,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:04,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-26 01:02:04,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2022-11-26 01:02:04,941 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) [2022-11-26 01:02:05,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:05,728 INFO L93 Difference]: Finished difference Result 123 states and 167 transitions. [2022-11-26 01:02:05,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-26 01:02:05,732 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 [2022-11-26 01:02:05,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:05,733 INFO L225 Difference]: With dead ends: 123 [2022-11-26 01:02:05,733 INFO L226 Difference]: Without dead ends: 119 [2022-11-26 01:02:05,734 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 [2022-11-26 01:02:05,735 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 [2022-11-26 01:02:05,735 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] [2022-11-26 01:02:05,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-26 01:02:05,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 55. [2022-11-26 01:02:05,742 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) [2022-11-26 01:02:05,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 67 transitions. [2022-11-26 01:02:05,743 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 67 transitions. Word has length 44 [2022-11-26 01:02:05,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:05,744 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 67 transitions. [2022-11-26 01:02:05,744 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) [2022-11-26 01:02:05,744 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 67 transitions. [2022-11-26 01:02:05,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-26 01:02:05,745 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:05,745 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] [2022-11-26 01:02:05,756 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-26 01:02:05,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:05,951 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:05,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:05,951 INFO L85 PathProgramCache]: Analyzing trace with hash -1481032095, now seen corresponding path program 3 times [2022-11-26 01:02:05,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:05,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745774337] [2022-11-26 01:02:05,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:05,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:05,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:06,271 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-26 01:02:06,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:06,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745774337] [2022-11-26 01:02:06,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745774337] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:06,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987808213] [2022-11-26 01:02:06,272 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:02:06,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:06,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:06,274 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:06,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-26 01:02:06,370 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:02:06,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:02:06,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-26 01:02:06,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:06,551 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-26 01:02:06,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:07,582 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-26 01:02:07,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987808213] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:07,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056310435] [2022-11-26 01:02:07,585 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:02:07,585 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:07,585 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:07,586 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:07,586 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 28 [2022-11-26 01:02:07,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767830677] [2022-11-26 01:02:07,587 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:07,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-26 01:02:07,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:07,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-26 01:02:07,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=675, Unknown=0, NotChecked=0, Total=756 [2022-11-26 01:02:07,589 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) [2022-11-26 01:02:07,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:07,993 INFO L93 Difference]: Finished difference Result 85 states and 107 transitions. [2022-11-26 01:02:07,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-26 01:02:07,994 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 [2022-11-26 01:02:07,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:07,995 INFO L225 Difference]: With dead ends: 85 [2022-11-26 01:02:07,995 INFO L226 Difference]: Without dead ends: 81 [2022-11-26 01:02:07,996 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 [2022-11-26 01:02:07,997 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 59 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 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, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 01:02:07,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 227 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 01:02:07,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-26 01:02:08,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 66. [2022-11-26 01:02:08,004 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) [2022-11-26 01:02:08,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 82 transitions. [2022-11-26 01:02:08,005 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 82 transitions. Word has length 43 [2022-11-26 01:02:08,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:08,006 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 82 transitions. [2022-11-26 01:02:08,006 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) [2022-11-26 01:02:08,006 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 82 transitions. [2022-11-26 01:02:08,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-26 01:02:08,007 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:08,010 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] [2022-11-26 01:02:08,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-26 01:02:08,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-26 01:02:08,216 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:08,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:08,216 INFO L85 PathProgramCache]: Analyzing trace with hash -755567679, now seen corresponding path program 1 times [2022-11-26 01:02:08,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:08,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544685708] [2022-11-26 01:02:08,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:08,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:08,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:08,471 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:02:08,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:08,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544685708] [2022-11-26 01:02:08,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544685708] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:08,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [30490280] [2022-11-26 01:02:08,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:08,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:08,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:08,473 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:08,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-26 01:02:08,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:08,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-26 01:02:08,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:08,929 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-26 01:02:08,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:10,146 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-26 01:02:10,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [30490280] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:10,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [15670383] [2022-11-26 01:02:10,152 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:02:10,154 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:10,155 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:10,156 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:10,157 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17] total 33 [2022-11-26 01:02:10,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851831968] [2022-11-26 01:02:10,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:10,158 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-26 01:02:10,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:10,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-26 01:02:10,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2022-11-26 01:02:10,160 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) [2022-11-26 01:02:10,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:10,944 INFO L93 Difference]: Finished difference Result 111 states and 146 transitions. [2022-11-26 01:02:10,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-26 01:02:10,945 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 [2022-11-26 01:02:10,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:10,946 INFO L225 Difference]: With dead ends: 111 [2022-11-26 01:02:10,946 INFO L226 Difference]: Without dead ends: 107 [2022-11-26 01:02:10,947 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 [2022-11-26 01:02:10,948 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 86 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 733 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 429 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 01:02:10,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 429 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 733 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:02:10,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-11-26 01:02:10,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2022-11-26 01:02:10,958 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) [2022-11-26 01:02:10,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 88 transitions. [2022-11-26 01:02:10,959 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 88 transitions. Word has length 43 [2022-11-26 01:02:10,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:10,959 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 88 transitions. [2022-11-26 01:02:10,960 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) [2022-11-26 01:02:10,960 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 88 transitions. [2022-11-26 01:02:10,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-26 01:02:10,961 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:10,961 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] [2022-11-26 01:02:10,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-26 01:02:11,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-26 01:02:11,167 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:11,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:11,167 INFO L85 PathProgramCache]: Analyzing trace with hash 647656449, now seen corresponding path program 2 times [2022-11-26 01:02:11,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:11,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946984680] [2022-11-26 01:02:11,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:11,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:11,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:11,395 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:02:11,395 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:11,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946984680] [2022-11-26 01:02:11,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946984680] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:11,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232055485] [2022-11-26 01:02:11,395 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:02:11,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:11,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:11,400 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:11,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-26 01:02:11,497 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-26 01:02:11,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:02:11,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-26 01:02:11,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:11,665 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 01:02:11,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:12,538 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:02:12,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [232055485] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:12,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [730525295] [2022-11-26 01:02:12,546 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:02:12,546 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:12,546 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:12,548 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:12,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14] total 21 [2022-11-26 01:02:12,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911345369] [2022-11-26 01:02:12,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:12,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-26 01:02:12,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:12,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-26 01:02:12,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=366, Unknown=0, NotChecked=0, Total=420 [2022-11-26 01:02:12,551 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) [2022-11-26 01:02:12,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:12,870 INFO L93 Difference]: Finished difference Result 98 states and 125 transitions. [2022-11-26 01:02:12,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-26 01:02:12,870 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 [2022-11-26 01:02:12,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:12,871 INFO L225 Difference]: With dead ends: 98 [2022-11-26 01:02:12,871 INFO L226 Difference]: Without dead ends: 94 [2022-11-26 01:02:12,872 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 [2022-11-26 01:02:12,872 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 47 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 01:02:12,872 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 234 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 01:02:12,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-26 01:02:12,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 77. [2022-11-26 01:02:12,881 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) [2022-11-26 01:02:12,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 99 transitions. [2022-11-26 01:02:12,882 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 99 transitions. Word has length 43 [2022-11-26 01:02:12,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:12,883 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 99 transitions. [2022-11-26 01:02:12,883 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) [2022-11-26 01:02:12,883 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 99 transitions. [2022-11-26 01:02:12,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-26 01:02:12,884 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:12,884 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] [2022-11-26 01:02:12,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-26 01:02:13,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-26 01:02:13,090 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:13,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:13,091 INFO L85 PathProgramCache]: Analyzing trace with hash -1586980819, now seen corresponding path program 3 times [2022-11-26 01:02:13,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:13,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198091927] [2022-11-26 01:02:13,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:13,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:13,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:13,411 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 21 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-26 01:02:13,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:13,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198091927] [2022-11-26 01:02:13,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198091927] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:13,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123220528] [2022-11-26 01:02:13,412 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:02:13,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:13,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:13,413 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:13,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-26 01:02:13,520 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:02:13,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:02:13,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-26 01:02:13,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:13,737 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-26 01:02:13,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:15,261 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 7 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:02:15,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123220528] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:15,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1204469931] [2022-11-26 01:02:15,263 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:02:15,263 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:15,263 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:15,263 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:15,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 19] total 31 [2022-11-26 01:02:15,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140789806] [2022-11-26 01:02:15,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:15,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-26 01:02:15,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:15,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-26 01:02:15,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=838, Unknown=0, NotChecked=0, Total=930 [2022-11-26 01:02:15,266 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) [2022-11-26 01:02:15,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:15,848 INFO L93 Difference]: Finished difference Result 128 states and 164 transitions. [2022-11-26 01:02:15,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-26 01:02:15,848 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 [2022-11-26 01:02:15,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:15,850 INFO L225 Difference]: With dead ends: 128 [2022-11-26 01:02:15,850 INFO L226 Difference]: Without dead ends: 124 [2022-11-26 01:02:15,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 83 SyntacticMatches, 8 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=227, Invalid=1413, Unknown=0, NotChecked=0, Total=1640 [2022-11-26 01:02:15,851 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 65 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 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 [2022-11-26 01:02:15,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 297 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:02:15,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-26 01:02:15,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 79. [2022-11-26 01:02:15,862 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) [2022-11-26 01:02:15,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 101 transitions. [2022-11-26 01:02:15,863 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 101 transitions. Word has length 51 [2022-11-26 01:02:15,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:15,863 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 101 transitions. [2022-11-26 01:02:15,863 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) [2022-11-26 01:02:15,864 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 101 transitions. [2022-11-26 01:02:15,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-26 01:02:15,865 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:15,865 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] [2022-11-26 01:02:15,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-26 01:02:16,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:16,071 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:16,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:16,071 INFO L85 PathProgramCache]: Analyzing trace with hash -1551997235, now seen corresponding path program 4 times [2022-11-26 01:02:16,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:16,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204865296] [2022-11-26 01:02:16,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:16,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:16,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:16,387 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-26 01:02:16,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:16,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204865296] [2022-11-26 01:02:16,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204865296] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:16,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897763471] [2022-11-26 01:02:16,388 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:02:16,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:16,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:16,392 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:16,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-26 01:02:16,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:16,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-26 01:02:16,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:16,914 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-26 01:02:16,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:18,631 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 28 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-26 01:02:18,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897763471] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:18,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1098374803] [2022-11-26 01:02:18,639 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:02:18,639 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:18,640 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:18,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:18,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 20] total 36 [2022-11-26 01:02:18,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706453142] [2022-11-26 01:02:18,642 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:18,642 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-26 01:02:18,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:18,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-26 01:02:18,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1156, Unknown=0, NotChecked=0, Total=1260 [2022-11-26 01:02:18,646 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) [2022-11-26 01:02:19,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:19,509 INFO L93 Difference]: Finished difference Result 123 states and 165 transitions. [2022-11-26 01:02:19,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-26 01:02:19,510 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 [2022-11-26 01:02:19,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:19,511 INFO L225 Difference]: With dead ends: 123 [2022-11-26 01:02:19,511 INFO L226 Difference]: Without dead ends: 119 [2022-11-26 01:02:19,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 76 SyntacticMatches, 10 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=320, Invalid=2230, Unknown=0, NotChecked=0, Total=2550 [2022-11-26 01:02:19,514 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 50 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 746 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 01:02:19,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 314 Invalid, 746 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:02:19,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-26 01:02:19,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 58. [2022-11-26 01:02:19,522 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) [2022-11-26 01:02:19,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2022-11-26 01:02:19,523 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 51 [2022-11-26 01:02:19,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:19,524 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2022-11-26 01:02:19,524 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) [2022-11-26 01:02:19,524 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2022-11-26 01:02:19,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-26 01:02:19,525 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:19,525 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] [2022-11-26 01:02:19,536 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-26 01:02:19,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:19,731 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:19,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:19,731 INFO L85 PathProgramCache]: Analyzing trace with hash -1294432549, now seen corresponding path program 4 times [2022-11-26 01:02:19,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:19,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31903629] [2022-11-26 01:02:19,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:19,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:19,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:20,116 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:02:20,116 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:20,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31903629] [2022-11-26 01:02:20,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31903629] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:20,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039918450] [2022-11-26 01:02:20,117 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:02:20,117 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:20,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:20,119 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:20,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-26 01:02:20,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:20,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-26 01:02:20,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:20,473 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-26 01:02:20,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:21,782 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:02:21,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039918450] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:21,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [556017538] [2022-11-26 01:02:21,784 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:02:21,784 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:21,785 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:21,786 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:21,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 18] total 29 [2022-11-26 01:02:21,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261217158] [2022-11-26 01:02:21,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:21,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-26 01:02:21,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:21,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-26 01:02:21,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=734, Unknown=0, NotChecked=0, Total=812 [2022-11-26 01:02:21,788 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) [2022-11-26 01:02:22,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:22,297 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2022-11-26 01:02:22,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-26 01:02:22,298 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 [2022-11-26 01:02:22,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:22,299 INFO L225 Difference]: With dead ends: 88 [2022-11-26 01:02:22,299 INFO L226 Difference]: Without dead ends: 84 [2022-11-26 01:02:22,299 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 [2022-11-26 01:02:22,300 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 47 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 01:02:22,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 388 Invalid, 577 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:02:22,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-26 01:02:22,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 69. [2022-11-26 01:02:22,308 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) [2022-11-26 01:02:22,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 85 transitions. [2022-11-26 01:02:22,309 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 85 transitions. Word has length 50 [2022-11-26 01:02:22,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:22,310 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 85 transitions. [2022-11-26 01:02:22,310 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) [2022-11-26 01:02:22,310 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 85 transitions. [2022-11-26 01:02:22,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-26 01:02:22,311 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:22,311 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] [2022-11-26 01:02:22,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-26 01:02:22,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:22,519 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:22,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:22,520 INFO L85 PathProgramCache]: Analyzing trace with hash 36046203, now seen corresponding path program 5 times [2022-11-26 01:02:22,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:22,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003832837] [2022-11-26 01:02:22,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:22,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:22,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:22,893 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:02:22,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:22,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003832837] [2022-11-26 01:02:22,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003832837] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:22,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931088336] [2022-11-26 01:02:22,894 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:02:22,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:22,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:22,896 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:22,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-26 01:02:23,066 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-26 01:02:23,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:02:23,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-26 01:02:23,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:23,294 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-26 01:02:23,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:24,525 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 01:02:24,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [931088336] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:24,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1587716322] [2022-11-26 01:02:24,527 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:02:24,527 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:24,527 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:24,528 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:24,528 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15, 18] total 29 [2022-11-26 01:02:24,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334345078] [2022-11-26 01:02:24,529 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:24,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-26 01:02:24,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:24,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-26 01:02:24,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=734, Unknown=0, NotChecked=0, Total=812 [2022-11-26 01:02:24,531 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) [2022-11-26 01:02:25,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:25,051 INFO L93 Difference]: Finished difference Result 96 states and 120 transitions. [2022-11-26 01:02:25,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-26 01:02:25,054 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 [2022-11-26 01:02:25,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:25,055 INFO L225 Difference]: With dead ends: 96 [2022-11-26 01:02:25,055 INFO L226 Difference]: Without dead ends: 92 [2022-11-26 01:02:25,056 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 [2022-11-26 01:02:25,057 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 75 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 574 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 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, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 01:02:25,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 398 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 574 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:02:25,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-26 01:02:25,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 72. [2022-11-26 01:02:25,065 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) [2022-11-26 01:02:25,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 89 transitions. [2022-11-26 01:02:25,066 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 89 transitions. Word has length 50 [2022-11-26 01:02:25,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:25,067 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 89 transitions. [2022-11-26 01:02:25,067 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) [2022-11-26 01:02:25,067 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 89 transitions. [2022-11-26 01:02:25,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-26 01:02:25,068 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:25,068 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] [2022-11-26 01:02:25,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-26 01:02:25,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:25,274 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:25,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:25,274 INFO L85 PathProgramCache]: Analyzing trace with hash 1876802875, now seen corresponding path program 6 times [2022-11-26 01:02:25,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:25,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973366908] [2022-11-26 01:02:25,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:25,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:25,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:25,712 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 01:02:25,712 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:25,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973366908] [2022-11-26 01:02:25,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973366908] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:25,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853429582] [2022-11-26 01:02:25,713 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:02:25,713 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:25,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:25,714 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:25,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-26 01:02:25,858 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:02:25,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:02:25,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-26 01:02:25,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:26,253 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-26 01:02:26,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:27,440 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 01:02:27,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853429582] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:27,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1532511266] [2022-11-26 01:02:27,444 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:02:27,444 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:27,445 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:27,446 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:27,446 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 17] total 37 [2022-11-26 01:02:27,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54342951] [2022-11-26 01:02:27,446 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:27,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-26 01:02:27,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:27,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-26 01:02:27,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2022-11-26 01:02:27,453 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) [2022-11-26 01:02:28,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:28,405 INFO L93 Difference]: Finished difference Result 90 states and 114 transitions. [2022-11-26 01:02:28,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-26 01:02:28,408 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 [2022-11-26 01:02:28,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:28,409 INFO L225 Difference]: With dead ends: 90 [2022-11-26 01:02:28,409 INFO L226 Difference]: Without dead ends: 81 [2022-11-26 01:02:28,410 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 [2022-11-26 01:02:28,411 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 59 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 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, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 01:02:28,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 323 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 571 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:02:28,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-26 01:02:28,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 73. [2022-11-26 01:02:28,419 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) [2022-11-26 01:02:28,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 90 transitions. [2022-11-26 01:02:28,420 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 90 transitions. Word has length 50 [2022-11-26 01:02:28,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:28,420 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 90 transitions. [2022-11-26 01:02:28,420 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) [2022-11-26 01:02:28,421 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 90 transitions. [2022-11-26 01:02:28,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-26 01:02:28,421 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:28,422 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] [2022-11-26 01:02:28,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-26 01:02:28,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-26 01:02:28,628 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:28,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:28,628 INFO L85 PathProgramCache]: Analyzing trace with hash 1448267663, now seen corresponding path program 7 times [2022-11-26 01:02:28,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:28,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549209375] [2022-11-26 01:02:28,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:28,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:28,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:29,027 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-26 01:02:29,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:29,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549209375] [2022-11-26 01:02:29,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549209375] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:29,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976125666] [2022-11-26 01:02:29,028 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:02:29,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:29,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:29,029 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:29,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-26 01:02:29,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:29,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-26 01:02:29,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:29,469 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 18 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-26 01:02:29,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:31,332 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-26 01:02:31,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976125666] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:02:31,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [856773629] [2022-11-26 01:02:31,334 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:02:31,334 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:31,334 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:31,335 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:02:31,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 19] total 30 [2022-11-26 01:02:31,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138716409] [2022-11-26 01:02:31,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:31,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-26 01:02:31,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:31,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-26 01:02:31,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=790, Unknown=0, NotChecked=0, Total=870 [2022-11-26 01:02:31,338 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) [2022-11-26 01:02:31,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:31,935 INFO L93 Difference]: Finished difference Result 103 states and 128 transitions. [2022-11-26 01:02:31,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-26 01:02:31,935 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 [2022-11-26 01:02:31,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:31,936 INFO L225 Difference]: With dead ends: 103 [2022-11-26 01:02:31,937 INFO L226 Difference]: Without dead ends: 99 [2022-11-26 01:02:31,937 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 [2022-11-26 01:02:31,938 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 64 mSDsluCounter, 411 mSDsCounter, 0 mSdLazyCounter, 660 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 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 [2022-11-26 01:02:31,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 436 Invalid, 685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 660 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:02:31,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-26 01:02:31,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 80. [2022-11-26 01:02:31,946 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) [2022-11-26 01:02:31,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 101 transitions. [2022-11-26 01:02:31,947 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 101 transitions. Word has length 58 [2022-11-26 01:02:31,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:31,948 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 101 transitions. [2022-11-26 01:02:31,948 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) [2022-11-26 01:02:31,948 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 101 transitions. [2022-11-26 01:02:31,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-26 01:02:31,949 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:31,950 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] [2022-11-26 01:02:31,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-26 01:02:32,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-26 01:02:32,167 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:32,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:32,167 INFO L85 PathProgramCache]: Analyzing trace with hash -189962193, now seen corresponding path program 5 times [2022-11-26 01:02:32,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:32,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186024138] [2022-11-26 01:02:32,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:32,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:32,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:32,586 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 3 proven. 43 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-26 01:02:32,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:32,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186024138] [2022-11-26 01:02:32,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186024138] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:32,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989291651] [2022-11-26 01:02:32,587 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:02:32,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:32,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:32,588 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:32,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-26 01:02:32,798 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-26 01:02:32,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:02:32,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-26 01:02:32,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:33,300 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 10 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-26 01:02:33,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:02:38,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989291651] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:38,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253152735] [2022-11-26 01:02:38,613 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:02:38,614 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:02:38,614 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:02:38,614 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:02:38,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 33 [2022-11-26 01:02:38,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536330491] [2022-11-26 01:02:38,615 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:02:38,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-26 01:02:38,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:02:38,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-26 01:02:38,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1595, Unknown=3, NotChecked=0, Total=1722 [2022-11-26 01:02:38,617 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) [2022-11-26 01:02:39,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:02:39,529 INFO L93 Difference]: Finished difference Result 109 states and 139 transitions. [2022-11-26 01:02:39,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-26 01:02:39,530 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 [2022-11-26 01:02:39,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:02:39,531 INFO L225 Difference]: With dead ends: 109 [2022-11-26 01:02:39,531 INFO L226 Difference]: Without dead ends: 105 [2022-11-26 01:02:39,533 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=261, Invalid=2492, Unknown=3, NotChecked=0, Total=2756 [2022-11-26 01:02:39,533 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 71 mSDsluCounter, 428 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 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 [2022-11-26 01:02:39,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 455 Invalid, 847 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 814 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:02:39,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-11-26 01:02:39,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 83. [2022-11-26 01:02:39,543 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) [2022-11-26 01:02:39,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 106 transitions. [2022-11-26 01:02:39,544 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 106 transitions. Word has length 58 [2022-11-26 01:02:39,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:02:39,544 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 106 transitions. [2022-11-26 01:02:39,545 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) [2022-11-26 01:02:39,545 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 106 transitions. [2022-11-26 01:02:39,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-26 01:02:39,546 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:02:39,546 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] [2022-11-26 01:02:39,555 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-26 01:02:39,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:39,752 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:02:39,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:02:39,752 INFO L85 PathProgramCache]: Analyzing trace with hash 2144331151, now seen corresponding path program 8 times [2022-11-26 01:02:39,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:02:39,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670333920] [2022-11-26 01:02:39,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:02:39,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:02:39,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:02:40,266 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:02:40,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:02:40,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670333920] [2022-11-26 01:02:40,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670333920] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:02:40,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650198589] [2022-11-26 01:02:40,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:02:40,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:02:40,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:02:40,268 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:02:40,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-26 01:02:40,462 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-26 01:02:40,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:02:40,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-26 01:02:40,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:02:41,002 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 9 proven. 20 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-26 01:02:41,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:11:54,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650198589] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:11:54,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020157343] [2022-11-26 01:11:54,723 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:11:54,724 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:11:54,724 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:11:54,725 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:11:54,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18] total 35 [2022-11-26 01:11:54,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261873075] [2022-11-26 01:11:54,726 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:11:54,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-26 01:11:54,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:11:54,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-26 01:11:54,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2031, Unknown=1, NotChecked=0, Total=2162 [2022-11-26 01:11:54,728 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) [2022-11-26 01:11:56,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:11:56,364 INFO L93 Difference]: Finished difference Result 150 states and 200 transitions. [2022-11-26 01:11:56,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-26 01:11:56,365 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 [2022-11-26 01:11:56,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:11:56,368 INFO L225 Difference]: With dead ends: 150 [2022-11-26 01:11:56,368 INFO L226 Difference]: Without dead ends: 146 [2022-11-26 01:11:56,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=379, Invalid=3780, Unknown=1, NotChecked=0, Total=4160 [2022-11-26 01:11:56,369 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 41 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 1141 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 582 SdHoareTripleChecker+Invalid, 1157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-26 01:11:56,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 582 Invalid, 1157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1141 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-26 01:11:56,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-26 01:11:56,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 95. [2022-11-26 01:11:56,385 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) [2022-11-26 01:11:56,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 125 transitions. [2022-11-26 01:11:56,387 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 125 transitions. Word has length 58 [2022-11-26 01:11:56,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:11:56,387 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 125 transitions. [2022-11-26 01:11:56,387 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) [2022-11-26 01:11:56,388 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 125 transitions. [2022-11-26 01:11:56,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-26 01:11:56,389 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:11:56,389 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] [2022-11-26 01:11:56,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-26 01:11:56,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-26 01:11:56,596 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:11:56,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:11:56,596 INFO L85 PathProgramCache]: Analyzing trace with hash -512406289, now seen corresponding path program 9 times [2022-11-26 01:11:56,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:11:56,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826963377] [2022-11-26 01:11:56,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:11:56,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:11:56,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:11:57,022 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-26 01:11:57,022 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:11:57,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826963377] [2022-11-26 01:11:57,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826963377] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:11:57,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658546264] [2022-11-26 01:11:57,023 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:11:57,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:11:57,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:11:57,028 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:11:57,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-26 01:11:57,238 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:11:57,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:11:57,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-26 01:11:57,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:11:57,555 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 18 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-26 01:11:57,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:11:59,423 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-26 01:11:59,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658546264] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:11:59,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [426947551] [2022-11-26 01:11:59,425 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:11:59,426 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:11:59,426 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:11:59,427 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:11:59,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 19] total 30 [2022-11-26 01:11:59,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658766091] [2022-11-26 01:11:59,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:11:59,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-26 01:11:59,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:11:59,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-26 01:11:59,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=790, Unknown=0, NotChecked=0, Total=870 [2022-11-26 01:11:59,430 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) [2022-11-26 01:12:00,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:12:00,009 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2022-11-26 01:12:00,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-26 01:12:00,010 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 [2022-11-26 01:12:00,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:12:00,011 INFO L225 Difference]: With dead ends: 120 [2022-11-26 01:12:00,011 INFO L226 Difference]: Without dead ends: 116 [2022-11-26 01:12:00,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 95 SyntacticMatches, 12 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=173, Invalid=1309, Unknown=0, NotChecked=0, Total=1482 [2022-11-26 01:12:00,013 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 31 mSDsluCounter, 394 mSDsCounter, 0 mSdLazyCounter, 622 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 01:12:00,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 422 Invalid, 629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 622 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:12:00,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-26 01:12:00,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 95. [2022-11-26 01:12:00,023 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) [2022-11-26 01:12:00,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 125 transitions. [2022-11-26 01:12:00,025 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 125 transitions. Word has length 58 [2022-11-26 01:12:00,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:12:00,025 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 125 transitions. [2022-11-26 01:12:00,025 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) [2022-11-26 01:12:00,025 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 125 transitions. [2022-11-26 01:12:00,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-26 01:12:00,026 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:12:00,027 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] [2022-11-26 01:12:00,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-26 01:12:00,232 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-26 01:12:00,233 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:12:00,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:12:00,233 INFO L85 PathProgramCache]: Analyzing trace with hash 1983911375, now seen corresponding path program 10 times [2022-11-26 01:12:00,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:12:00,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387201686] [2022-11-26 01:12:00,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:12:00,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:12:00,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:00,705 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:12:00,706 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:12:00,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387201686] [2022-11-26 01:12:00,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387201686] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:00,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473203825] [2022-11-26 01:12:00,706 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:12:00,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:00,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:12:00,707 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:12:00,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-26 01:12:00,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:00,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-26 01:12:00,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:12:01,537 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 15 proven. 17 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 01:12:01,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:12:04,680 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 2 proven. 41 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:12:04,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473203825] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:12:04,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [287820416] [2022-11-26 01:12:04,682 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:12:04,682 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:12:04,683 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:12:04,684 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:12:04,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 18, 22] total 48 [2022-11-26 01:12:04,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524388823] [2022-11-26 01:12:04,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:12:04,685 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-26 01:12:04,685 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:12:04,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-26 01:12:04,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=2106, Unknown=0, NotChecked=0, Total=2256 [2022-11-26 01:12:04,687 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) [2022-11-26 01:12:06,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:12:06,221 INFO L93 Difference]: Finished difference Result 171 states and 225 transitions. [2022-11-26 01:12:06,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-26 01:12:06,221 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 [2022-11-26 01:12:06,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:12:06,223 INFO L225 Difference]: With dead ends: 171 [2022-11-26 01:12:06,223 INFO L226 Difference]: Without dead ends: 167 [2022-11-26 01:12:06,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 85 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 711 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=425, Invalid=3607, Unknown=0, NotChecked=0, Total=4032 [2022-11-26 01:12:06,225 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 35 mSDsluCounter, 837 mSDsCounter, 0 mSdLazyCounter, 1408 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 872 SdHoareTripleChecker+Invalid, 1433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 1408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-26 01:12:06,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 872 Invalid, 1433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 1408 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-26 01:12:06,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-11-26 01:12:06,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 107. [2022-11-26 01:12:06,240 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) [2022-11-26 01:12:06,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 142 transitions. [2022-11-26 01:12:06,241 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 142 transitions. Word has length 58 [2022-11-26 01:12:06,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:12:06,241 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 142 transitions. [2022-11-26 01:12:06,241 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) [2022-11-26 01:12:06,242 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 142 transitions. [2022-11-26 01:12:06,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-26 01:12:06,243 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:12:06,243 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] [2022-11-26 01:12:06,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-26 01:12:06,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-26 01:12:06,449 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:12:06,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:12:06,450 INFO L85 PathProgramCache]: Analyzing trace with hash 23237423, now seen corresponding path program 11 times [2022-11-26 01:12:06,450 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:12:06,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550092521] [2022-11-26 01:12:06,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:12:06,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:12:06,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:06,899 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-26 01:12:06,899 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:12:06,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550092521] [2022-11-26 01:12:06,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550092521] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:06,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801406030] [2022-11-26 01:12:06,899 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:12:06,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:06,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:12:06,901 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:12:06,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-26 01:12:07,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-26 01:12:07,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:12:07,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-26 01:12:07,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:12:07,704 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-26 01:12:07,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:12:10,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801406030] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:10,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2116475558] [2022-11-26 01:12:10,170 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:12:10,171 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:12:10,171 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:12:10,172 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:12:10,172 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 33 [2022-11-26 01:12:10,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008939694] [2022-11-26 01:12:10,173 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:12:10,173 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-26 01:12:10,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:12:10,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-26 01:12:10,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1448, Unknown=1, NotChecked=0, Total=1560 [2022-11-26 01:12:10,174 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) [2022-11-26 01:12:11,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:12:11,195 INFO L93 Difference]: Finished difference Result 159 states and 215 transitions. [2022-11-26 01:12:11,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-26 01:12:11,196 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 [2022-11-26 01:12:11,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:12:11,198 INFO L225 Difference]: With dead ends: 159 [2022-11-26 01:12:11,198 INFO L226 Difference]: Without dead ends: 155 [2022-11-26 01:12:11,199 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 65 SyntacticMatches, 5 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=263, Invalid=2706, Unknown=1, NotChecked=0, Total=2970 [2022-11-26 01:12:11,200 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 56 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1028 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 1051 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1028 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-26 01:12:11,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 553 Invalid, 1051 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1028 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-26 01:12:11,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-11-26 01:12:11,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 106. [2022-11-26 01:12:11,213 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) [2022-11-26 01:12:11,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 139 transitions. [2022-11-26 01:12:11,215 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 139 transitions. Word has length 58 [2022-11-26 01:12:11,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:12:11,215 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 139 transitions. [2022-11-26 01:12:11,215 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) [2022-11-26 01:12:11,215 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 139 transitions. [2022-11-26 01:12:11,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-26 01:12:11,217 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:12:11,217 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] [2022-11-26 01:12:11,228 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-11-26 01:12:11,423 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-26 01:12:11,424 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:12:11,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:12:11,424 INFO L85 PathProgramCache]: Analyzing trace with hash -827028805, now seen corresponding path program 12 times [2022-11-26 01:12:11,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:12:11,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317621122] [2022-11-26 01:12:11,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:12:11,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:12:11,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:11,930 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 5 proven. 54 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 01:12:11,930 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:12:11,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317621122] [2022-11-26 01:12:11,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317621122] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:11,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27942811] [2022-11-26 01:12:11,931 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:12:11,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:11,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:12:11,932 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:12:11,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-26 01:12:12,228 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:12:12,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:12:12,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-26 01:12:12,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:12:12,774 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 18 proven. 28 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-26 01:12:12,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:12:18,073 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 3 proven. 63 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-26 01:12:18,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27942811] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:12:18,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [209924473] [2022-11-26 01:12:18,076 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:12:18,076 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:12:18,076 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:12:18,076 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:12:18,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 25] total 55 [2022-11-26 01:12:18,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360302496] [2022-11-26 01:12:18,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:12:18,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-26 01:12:18,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:12:18,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-26 01:12:18,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=2807, Unknown=0, NotChecked=0, Total=2970 [2022-11-26 01:12:18,082 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) [2022-11-26 01:12:19,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:12:19,613 INFO L93 Difference]: Finished difference Result 163 states and 212 transitions. [2022-11-26 01:12:19,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-26 01:12:19,613 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 [2022-11-26 01:12:19,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:12:19,615 INFO L225 Difference]: With dead ends: 163 [2022-11-26 01:12:19,615 INFO L226 Difference]: Without dead ends: 159 [2022-11-26 01:12:19,616 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 99 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=440, Invalid=4816, Unknown=0, NotChecked=0, Total=5256 [2022-11-26 01:12:19,617 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 96 mSDsluCounter, 688 mSDsCounter, 0 mSdLazyCounter, 1278 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 717 SdHoareTripleChecker+Invalid, 1335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 1278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-26 01:12:19,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 717 Invalid, 1335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 1278 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-26 01:12:19,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-11-26 01:12:19,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 114. [2022-11-26 01:12:19,629 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) [2022-11-26 01:12:19,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 151 transitions. [2022-11-26 01:12:19,630 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 151 transitions. Word has length 66 [2022-11-26 01:12:19,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:12:19,631 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 151 transitions. [2022-11-26 01:12:19,631 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) [2022-11-26 01:12:19,631 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 151 transitions. [2022-11-26 01:12:19,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-26 01:12:19,632 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:12:19,633 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] [2022-11-26 01:12:19,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-26 01:12:19,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:19,839 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:12:19,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:12:19,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1056647781, now seen corresponding path program 13 times [2022-11-26 01:12:19,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:12:19,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215018152] [2022-11-26 01:12:19,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:12:19,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:12:19,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:20,520 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-26 01:12:20,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:12:20,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215018152] [2022-11-26 01:12:20,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215018152] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:20,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186496257] [2022-11-26 01:12:20,521 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:12:20,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:20,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:12:20,523 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:12:20,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-26 01:12:20,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:20,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-26 01:12:20,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:12:21,697 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 11 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-26 01:12:21,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:12:24,898 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 2 proven. 62 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-26 01:12:24,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186496257] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:12:24,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1554091969] [2022-11-26 01:12:24,900 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:12:24,900 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:12:24,900 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:12:24,901 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:12:24,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 26] total 58 [2022-11-26 01:12:24,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668394914] [2022-11-26 01:12:24,902 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:12:24,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-26 01:12:24,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:12:24,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-26 01:12:24,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2022-11-26 01:12:24,904 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) [2022-11-26 01:12:26,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:12:26,506 INFO L93 Difference]: Finished difference Result 186 states and 258 transitions. [2022-11-26 01:12:26,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-26 01:12:26,506 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 [2022-11-26 01:12:26,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:12:26,508 INFO L225 Difference]: With dead ends: 186 [2022-11-26 01:12:26,508 INFO L226 Difference]: Without dead ends: 182 [2022-11-26 01:12:26,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 93 SyntacticMatches, 9 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 790 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=471, Invalid=4785, Unknown=0, NotChecked=0, Total=5256 [2022-11-26 01:12:26,510 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 138 mSDsluCounter, 748 mSDsCounter, 0 mSdLazyCounter, 1326 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 779 SdHoareTripleChecker+Invalid, 1423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 1326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-26 01:12:26,510 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 779 Invalid, 1423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 1326 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-26 01:12:26,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-11-26 01:12:26,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 118. [2022-11-26 01:12:26,543 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) [2022-11-26 01:12:26,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 159 transitions. [2022-11-26 01:12:26,545 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 159 transitions. Word has length 66 [2022-11-26 01:12:26,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:12:26,550 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 159 transitions. [2022-11-26 01:12:26,550 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) [2022-11-26 01:12:26,551 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 159 transitions. [2022-11-26 01:12:26,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-26 01:12:26,552 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:12:26,553 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] [2022-11-26 01:12:26,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-26 01:12:26,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:26,767 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:12:26,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:12:26,769 INFO L85 PathProgramCache]: Analyzing trace with hash 290492763, now seen corresponding path program 14 times [2022-11-26 01:12:26,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:12:26,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190453765] [2022-11-26 01:12:26,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:12:26,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:12:26,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:27,374 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-26 01:12:27,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:12:27,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190453765] [2022-11-26 01:12:27,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190453765] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:27,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980022097] [2022-11-26 01:12:27,375 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:12:27,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:27,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:12:27,376 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:12:27,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-26 01:12:27,696 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-26 01:12:27,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:12:27,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-26 01:12:27,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:12:28,320 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 18 proven. 27 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-26 01:12:28,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:12:33,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980022097] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:33,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2119535971] [2022-11-26 01:12:33,607 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:12:33,607 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:12:33,607 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:12:33,608 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:12:33,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19] total 37 [2022-11-26 01:12:33,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699736787] [2022-11-26 01:12:33,609 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:12:33,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-26 01:12:33,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:12:33,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-26 01:12:33,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1945, Unknown=2, NotChecked=0, Total=2070 [2022-11-26 01:12:33,611 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) [2022-11-26 01:12:35,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:12:35,284 INFO L93 Difference]: Finished difference Result 212 states and 298 transitions. [2022-11-26 01:12:35,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-26 01:12:35,285 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 [2022-11-26 01:12:35,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:12:35,286 INFO L225 Difference]: With dead ends: 212 [2022-11-26 01:12:35,286 INFO L226 Difference]: Without dead ends: 208 [2022-11-26 01:12:35,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=409, Invalid=4145, Unknown=2, NotChecked=0, Total=4556 [2022-11-26 01:12:35,288 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 44 mSDsluCounter, 623 mSDsCounter, 0 mSdLazyCounter, 1337 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 652 SdHoareTripleChecker+Invalid, 1355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-26 01:12:35,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 652 Invalid, 1355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1337 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-26 01:12:35,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-11-26 01:12:35,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 124. [2022-11-26 01:12:35,306 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) [2022-11-26 01:12:35,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 169 transitions. [2022-11-26 01:12:35,308 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 169 transitions. Word has length 66 [2022-11-26 01:12:35,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:12:35,308 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 169 transitions. [2022-11-26 01:12:35,308 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) [2022-11-26 01:12:35,309 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 169 transitions. [2022-11-26 01:12:35,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-26 01:12:35,310 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:12:35,310 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] [2022-11-26 01:12:35,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-26 01:12:35,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:35,517 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:12:35,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:12:35,518 INFO L85 PathProgramCache]: Analyzing trace with hash 1523546395, now seen corresponding path program 15 times [2022-11-26 01:12:35,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:12:35,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836344986] [2022-11-26 01:12:35,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:12:35,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:12:35,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:36,100 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-26 01:12:36,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:12:36,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836344986] [2022-11-26 01:12:36,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836344986] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:36,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649948240] [2022-11-26 01:12:36,100 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:12:36,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:36,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:12:36,104 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:12:36,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-26 01:12:36,479 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:12:36,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:12:36,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-26 01:12:36,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:12:37,135 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 24 proven. 24 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-26 01:12:37,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:12:48,198 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649948240] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:48,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1586452663] [2022-11-26 01:12:48,200 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:12:48,200 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:12:48,200 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:12:48,201 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:12:48,201 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 19] total 36 [2022-11-26 01:12:48,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899732337] [2022-11-26 01:12:48,201 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:12:48,201 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-26 01:12:48,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:12:48,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-26 01:12:48,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2107, Unknown=2, NotChecked=0, Total=2256 [2022-11-26 01:12:48,202 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) [2022-11-26 01:12:49,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:12:49,384 INFO L93 Difference]: Finished difference Result 206 states and 291 transitions. [2022-11-26 01:12:49,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-26 01:12:49,384 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 [2022-11-26 01:12:49,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:12:49,386 INFO L225 Difference]: With dead ends: 206 [2022-11-26 01:12:49,386 INFO L226 Difference]: Without dead ends: 202 [2022-11-26 01:12:49,387 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 77 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 612 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=360, Invalid=3420, Unknown=2, NotChecked=0, Total=3782 [2022-11-26 01:12:49,388 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 62 mSDsluCounter, 542 mSDsCounter, 0 mSdLazyCounter, 970 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 1013 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 970 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-26 01:12:49,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 570 Invalid, 1013 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 970 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-26 01:12:49,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2022-11-26 01:12:49,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 121. [2022-11-26 01:12:49,410 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) [2022-11-26 01:12:49,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 164 transitions. [2022-11-26 01:12:49,411 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 164 transitions. Word has length 66 [2022-11-26 01:12:49,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:12:49,411 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 164 transitions. [2022-11-26 01:12:49,411 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) [2022-11-26 01:12:49,412 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 164 transitions. [2022-11-26 01:12:49,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-26 01:12:49,413 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:12:49,413 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] [2022-11-26 01:12:49,425 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-26 01:12:49,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:49,620 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:12:49,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:12:49,621 INFO L85 PathProgramCache]: Analyzing trace with hash -1653899333, now seen corresponding path program 16 times [2022-11-26 01:12:49,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:12:49,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985136784] [2022-11-26 01:12:49,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:12:49,621 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:12:49,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:50,141 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-26 01:12:50,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:12:50,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985136784] [2022-11-26 01:12:50,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985136784] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:50,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074652859] [2022-11-26 01:12:50,142 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:12:50,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:50,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:12:50,143 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:12:50,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-26 01:12:50,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:50,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-26 01:12:50,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:12:51,073 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-26 01:12:51,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:12:54,075 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 5 proven. 61 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-26 01:12:54,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074652859] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:12:54,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [346099904] [2022-11-26 01:12:54,076 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:12:54,076 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:12:54,077 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:12:54,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:12:54,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 25] total 45 [2022-11-26 01:12:54,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097889708] [2022-11-26 01:12:54,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:12:54,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-26 01:12:54,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:12:54,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-26 01:12:54,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1849, Unknown=0, NotChecked=0, Total=1980 [2022-11-26 01:12:54,080 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) [2022-11-26 01:12:55,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:12:55,462 INFO L93 Difference]: Finished difference Result 180 states and 245 transitions. [2022-11-26 01:12:55,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-26 01:12:55,463 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 [2022-11-26 01:12:55,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:12:55,464 INFO L225 Difference]: With dead ends: 180 [2022-11-26 01:12:55,464 INFO L226 Difference]: Without dead ends: 176 [2022-11-26 01:12:55,464 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 [2022-11-26 01:12:55,465 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 62 mSDsluCounter, 633 mSDsCounter, 0 mSdLazyCounter, 1321 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 1350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-26 01:12:55,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 666 Invalid, 1350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1321 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-26 01:12:55,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-11-26 01:12:55,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 62. [2022-11-26 01:12:55,475 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) [2022-11-26 01:12:55,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 74 transitions. [2022-11-26 01:12:55,476 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 74 transitions. Word has length 66 [2022-11-26 01:12:55,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:12:55,476 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 74 transitions. [2022-11-26 01:12:55,477 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) [2022-11-26 01:12:55,477 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 74 transitions. [2022-11-26 01:12:55,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-26 01:12:55,478 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:12:55,478 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] [2022-11-26 01:12:55,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-26 01:12:55,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-26 01:12:55,685 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:12:55,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:12:55,686 INFO L85 PathProgramCache]: Analyzing trace with hash 810550271, now seen corresponding path program 6 times [2022-11-26 01:12:55,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:12:55,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706425032] [2022-11-26 01:12:55,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:12:55,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:12:55,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:12:56,297 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:12:56,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:12:56,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706425032] [2022-11-26 01:12:56,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706425032] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:12:56,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829645392] [2022-11-26 01:12:56,298 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:12:56,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:12:56,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:12:56,300 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:12:56,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-26 01:12:56,761 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:12:56,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:12:56,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-26 01:12:56,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:12:57,483 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-26 01:12:57,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:12:59,371 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:12:59,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829645392] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:12:59,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245033970] [2022-11-26 01:12:59,373 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:12:59,373 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:12:59,374 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:12:59,374 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:12:59,375 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 21] total 46 [2022-11-26 01:12:59,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255191607] [2022-11-26 01:12:59,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:12:59,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-26 01:12:59,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:12:59,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-26 01:12:59,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2022-11-26 01:12:59,377 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) [2022-11-26 01:13:00,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:13:00,778 INFO L93 Difference]: Finished difference Result 84 states and 104 transitions. [2022-11-26 01:13:00,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-26 01:13:00,779 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 [2022-11-26 01:13:00,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:13:00,780 INFO L225 Difference]: With dead ends: 84 [2022-11-26 01:13:00,780 INFO L226 Difference]: Without dead ends: 75 [2022-11-26 01:13:00,780 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 79 SyntacticMatches, 10 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=347, Invalid=3075, Unknown=0, NotChecked=0, Total=3422 [2022-11-26 01:13:00,781 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 86 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 752 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 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, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 01:13:00,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 464 Invalid, 802 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 752 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:13:00,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-26 01:13:00,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 65. [2022-11-26 01:13:00,789 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) [2022-11-26 01:13:00,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-26 01:13:00,790 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 57 [2022-11-26 01:13:00,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:13:00,790 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-26 01:13:00,791 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) [2022-11-26 01:13:00,791 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-26 01:13:00,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-26 01:13:00,792 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:13:00,792 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] [2022-11-26 01:13:00,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-26 01:13:01,004 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-26 01:13:01,005 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:13:01,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:13:01,005 INFO L85 PathProgramCache]: Analyzing trace with hash 1093980511, now seen corresponding path program 17 times [2022-11-26 01:13:01,005 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:13:01,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109913585] [2022-11-26 01:13:01,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:13:01,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:13:01,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:01,598 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:13:01,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:13:01,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109913585] [2022-11-26 01:13:01,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109913585] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:13:01,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729598463] [2022-11-26 01:13:01,599 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:13:01,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:13:01,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:13:01,600 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:13:01,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-26 01:13:02,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-26 01:13:02,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:13:02,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-26 01:13:02,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:13:02,654 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 27 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-26 01:13:02,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:13:04,400 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 43 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-26 01:13:04,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729598463] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:13:04,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [342466988] [2022-11-26 01:13:04,402 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:13:04,402 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:13:04,402 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:13:04,403 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:13:04,404 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 21] total 46 [2022-11-26 01:13:04,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102989253] [2022-11-26 01:13:04,404 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:13:04,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-26 01:13:04,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:13:04,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-26 01:13:04,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2022-11-26 01:13:04,406 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) [2022-11-26 01:13:05,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:13:05,823 INFO L93 Difference]: Finished difference Result 88 states and 109 transitions. [2022-11-26 01:13:05,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-26 01:13:05,823 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 [2022-11-26 01:13:05,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:13:05,824 INFO L225 Difference]: With dead ends: 88 [2022-11-26 01:13:05,824 INFO L226 Difference]: Without dead ends: 79 [2022-11-26 01:13:05,825 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 [2022-11-26 01:13:05,826 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 67 mSDsluCounter, 493 mSDsCounter, 0 mSdLazyCounter, 839 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 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 [2022-11-26 01:13:05,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 520 Invalid, 868 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 839 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:13:05,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-26 01:13:05,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 68. [2022-11-26 01:13:05,834 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) [2022-11-26 01:13:05,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2022-11-26 01:13:05,835 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 57 [2022-11-26 01:13:05,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:13:05,835 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2022-11-26 01:13:05,835 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) [2022-11-26 01:13:05,836 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2022-11-26 01:13:05,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-26 01:13:05,836 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:13:05,837 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] [2022-11-26 01:13:05,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-26 01:13:06,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-26 01:13:06,044 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:13:06,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:13:06,044 INFO L85 PathProgramCache]: Analyzing trace with hash -162612181, now seen corresponding path program 7 times [2022-11-26 01:13:06,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:13:06,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634299309] [2022-11-26 01:13:06,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:13:06,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:13:06,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:06,570 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:13:06,570 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:13:06,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634299309] [2022-11-26 01:13:06,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634299309] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:13:06,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905297981] [2022-11-26 01:13:06,571 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:13:06,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:13:06,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:13:06,572 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:13:06,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-26 01:13:06,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:06,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-26 01:13:06,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:13:07,320 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-26 01:13:07,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:13:09,249 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [905297981] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:13:09,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1538316801] [2022-11-26 01:13:09,251 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:13:09,251 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:13:09,251 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:13:09,252 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:13:09,252 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18] total 30 [2022-11-26 01:13:09,253 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911703146] [2022-11-26 01:13:09,253 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:13:09,253 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-26 01:13:09,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:13:09,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-26 01:13:09,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=1096, Unknown=0, NotChecked=0, Total=1190 [2022-11-26 01:13:09,255 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) [2022-11-26 01:13:09,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:13:09,883 INFO L93 Difference]: Finished difference Result 100 states and 125 transitions. [2022-11-26 01:13:09,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-26 01:13:09,883 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 [2022-11-26 01:13:09,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:13:09,884 INFO L225 Difference]: With dead ends: 100 [2022-11-26 01:13:09,884 INFO L226 Difference]: Without dead ends: 96 [2022-11-26 01:13:09,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 82 SyntacticMatches, 8 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=210, Invalid=1860, Unknown=0, NotChecked=0, Total=2070 [2022-11-26 01:13:09,885 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 67 mSDsluCounter, 442 mSDsCounter, 0 mSdLazyCounter, 696 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 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, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 01:13:09,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 470 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 696 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 01:13:09,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-26 01:13:09,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 81. [2022-11-26 01:13:09,895 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) [2022-11-26 01:13:09,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 100 transitions. [2022-11-26 01:13:09,896 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 100 transitions. Word has length 65 [2022-11-26 01:13:09,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:13:09,896 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 100 transitions. [2022-11-26 01:13:09,897 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) [2022-11-26 01:13:09,897 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 100 transitions. [2022-11-26 01:13:09,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-26 01:13:09,898 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:13:09,898 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] [2022-11-26 01:13:09,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-26 01:13:10,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-26 01:13:10,105 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:13:10,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:13:10,106 INFO L85 PathProgramCache]: Analyzing trace with hash -293058357, now seen corresponding path program 18 times [2022-11-26 01:13:10,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:13:10,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59740589] [2022-11-26 01:13:10,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:13:10,107 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:13:10,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:10,768 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-26 01:13:10,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:13:10,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59740589] [2022-11-26 01:13:10,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59740589] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:13:10,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586618459] [2022-11-26 01:13:10,769 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:13:10,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:13:10,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:13:10,770 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:13:10,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-26 01:13:11,166 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:13:11,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:13:11,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-26 01:13:11,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:13:11,801 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-26 01:13:11,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:13:14,241 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-26 01:13:14,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1586618459] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:13:14,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [189802035] [2022-11-26 01:13:14,242 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:13:14,242 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:13:14,243 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:13:14,244 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:13:14,244 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 22] total 48 [2022-11-26 01:13:14,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525682953] [2022-11-26 01:13:14,244 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:13:14,245 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-26 01:13:14,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:13:14,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-26 01:13:14,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2120, Unknown=0, NotChecked=0, Total=2256 [2022-11-26 01:13:14,246 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) [2022-11-26 01:13:15,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:13:15,753 INFO L93 Difference]: Finished difference Result 99 states and 124 transitions. [2022-11-26 01:13:15,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-26 01:13:15,753 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 [2022-11-26 01:13:15,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:13:15,754 INFO L225 Difference]: With dead ends: 99 [2022-11-26 01:13:15,754 INFO L226 Difference]: Without dead ends: 90 [2022-11-26 01:13:15,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 93 SyntacticMatches, 13 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=365, Invalid=3417, Unknown=0, NotChecked=0, Total=3782 [2022-11-26 01:13:15,756 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 86 mSDsluCounter, 470 mSDsCounter, 0 mSdLazyCounter, 811 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 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, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 01:13:15,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 496 Invalid, 863 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 811 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:13:15,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-26 01:13:15,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 81. [2022-11-26 01:13:15,767 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) [2022-11-26 01:13:15,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 100 transitions. [2022-11-26 01:13:15,767 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 100 transitions. Word has length 65 [2022-11-26 01:13:15,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:13:15,768 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 100 transitions. [2022-11-26 01:13:15,768 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) [2022-11-26 01:13:15,768 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 100 transitions. [2022-11-26 01:13:15,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-26 01:13:15,769 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:13:15,769 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] [2022-11-26 01:13:15,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-26 01:13:15,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-26 01:13:15,977 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:13:15,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:13:15,978 INFO L85 PathProgramCache]: Analyzing trace with hash -398036277, now seen corresponding path program 19 times [2022-11-26 01:13:15,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:13:15,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608768153] [2022-11-26 01:13:15,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:13:15,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:13:15,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:16,510 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:13:16,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:13:16,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608768153] [2022-11-26 01:13:16,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608768153] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:13:16,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016771775] [2022-11-26 01:13:16,511 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:13:16,511 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:13:16,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:13:16,512 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:13:16,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-26 01:13:16,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:16,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-26 01:13:16,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:13:17,538 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 11 proven. 28 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-26 01:13:17,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:13:22,452 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 [2022-11-26 01:13:41,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016771775] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:13:41,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [533303429] [2022-11-26 01:13:41,785 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:13:41,785 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:13:41,785 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:13:41,786 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:13:41,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19] total 36 [2022-11-26 01:13:41,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565400148] [2022-11-26 01:13:41,786 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:13:41,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-26 01:13:41,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:13:41,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-26 01:13:41,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=2389, Unknown=6, NotChecked=98, Total=2652 [2022-11-26 01:13:41,788 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) [2022-11-26 01:13:43,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:13:43,089 INFO L93 Difference]: Finished difference Result 148 states and 191 transitions. [2022-11-26 01:13:43,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-26 01:13:43,090 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 [2022-11-26 01:13:43,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:13:43,091 INFO L225 Difference]: With dead ends: 148 [2022-11-26 01:13:43,091 INFO L226 Difference]: Without dead ends: 144 [2022-11-26 01:13:43,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 78 SyntacticMatches, 4 SemanticMatches, 67 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 736 ImplicationChecksByTransitivity, 23.1s TimeCoverageRelationStatistics Valid=422, Invalid=4132, Unknown=6, NotChecked=132, Total=4692 [2022-11-26 01:13:43,093 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 44 mSDsluCounter, 628 mSDsCounter, 0 mSdLazyCounter, 883 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 662 SdHoareTripleChecker+Invalid, 900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 883 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-26 01:13:43,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 662 Invalid, 900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 883 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-26 01:13:43,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-11-26 01:13:43,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 96. [2022-11-26 01:13:43,106 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) [2022-11-26 01:13:43,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 124 transitions. [2022-11-26 01:13:43,108 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 124 transitions. Word has length 65 [2022-11-26 01:13:43,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:13:43,108 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 124 transitions. [2022-11-26 01:13:43,108 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) [2022-11-26 01:13:43,108 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 124 transitions. [2022-11-26 01:13:43,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-26 01:13:43,110 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:13:43,110 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] [2022-11-26 01:13:43,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-26 01:13:43,317 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-26 01:13:43,318 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:13:43,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:13:43,318 INFO L85 PathProgramCache]: Analyzing trace with hash -528482453, now seen corresponding path program 20 times [2022-11-26 01:13:43,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:13:43,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875908557] [2022-11-26 01:13:43,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:13:43,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:13:43,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:44,001 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-26 01:13:44,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:13:44,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875908557] [2022-11-26 01:13:44,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875908557] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:13:44,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796955169] [2022-11-26 01:13:44,001 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:13:44,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:13:44,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:13:44,002 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:13:44,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-26 01:13:44,431 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-26 01:13:44,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:13:44,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-26 01:13:44,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:13:45,134 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-26 01:13:45,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:13:47,720 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-26 01:13:47,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796955169] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:13:47,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2112985080] [2022-11-26 01:13:47,721 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:13:47,721 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:13:47,722 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:13:47,723 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:13:47,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 22] total 48 [2022-11-26 01:13:47,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726687834] [2022-11-26 01:13:47,723 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:13:47,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-26 01:13:47,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:13:47,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-26 01:13:47,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2120, Unknown=0, NotChecked=0, Total=2256 [2022-11-26 01:13:47,725 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) [2022-11-26 01:13:49,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:13:49,334 INFO L93 Difference]: Finished difference Result 123 states and 163 transitions. [2022-11-26 01:13:49,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-26 01:13:49,335 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 [2022-11-26 01:13:49,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:13:49,336 INFO L225 Difference]: With dead ends: 123 [2022-11-26 01:13:49,336 INFO L226 Difference]: Without dead ends: 114 [2022-11-26 01:13:49,336 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 [2022-11-26 01:13:49,337 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 54 mSDsluCounter, 556 mSDsCounter, 0 mSdLazyCounter, 954 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 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 [2022-11-26 01:13:49,337 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 583 Invalid, 976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 954 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-26 01:13:49,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-11-26 01:13:49,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 99. [2022-11-26 01:13:49,350 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) [2022-11-26 01:13:49,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 128 transitions. [2022-11-26 01:13:49,351 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 128 transitions. Word has length 65 [2022-11-26 01:13:49,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:13:49,352 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 128 transitions. [2022-11-26 01:13:49,352 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) [2022-11-26 01:13:49,352 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 128 transitions. [2022-11-26 01:13:49,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-26 01:13:49,353 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:13:49,353 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] [2022-11-26 01:13:49,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-26 01:13:49,560 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-26 01:13:49,561 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:13:49,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:13:49,561 INFO L85 PathProgramCache]: Analyzing trace with hash 76249739, now seen corresponding path program 21 times [2022-11-26 01:13:49,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:13:49,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965231156] [2022-11-26 01:13:49,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:13:49,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:13:49,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:50,048 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-26 01:13:50,048 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:13:50,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965231156] [2022-11-26 01:13:50,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965231156] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:13:50,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926184742] [2022-11-26 01:13:50,048 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:13:50,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:13:50,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:13:50,049 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:13:50,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-26 01:13:50,506 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:13:50,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:13:50,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-26 01:13:50,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:13:51,040 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-11-26 01:13:51,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:13:54,346 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:13:54,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926184742] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:13:54,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1368771157] [2022-11-26 01:13:54,348 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:13:54,348 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:13:54,348 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:13:54,349 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:13:54,349 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 24] total 50 [2022-11-26 01:13:54,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340883454] [2022-11-26 01:13:54,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:13:54,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-26 01:13:54,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:13:54,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-26 01:13:54,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2309, Unknown=0, NotChecked=0, Total=2450 [2022-11-26 01:13:54,352 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) [2022-11-26 01:13:55,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:13:55,648 INFO L93 Difference]: Finished difference Result 141 states and 186 transitions. [2022-11-26 01:13:55,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-26 01:13:55,648 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 [2022-11-26 01:13:55,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:13:55,650 INFO L225 Difference]: With dead ends: 141 [2022-11-26 01:13:55,650 INFO L226 Difference]: Without dead ends: 137 [2022-11-26 01:13:55,651 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 [2022-11-26 01:13:55,651 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 88 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 1091 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 615 SdHoareTripleChecker+Invalid, 1132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1091 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-26 01:13:55,652 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 615 Invalid, 1132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 1091 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-26 01:13:55,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-11-26 01:13:55,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 106. [2022-11-26 01:13:55,666 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) [2022-11-26 01:13:55,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 137 transitions. [2022-11-26 01:13:55,667 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 137 transitions. Word has length 65 [2022-11-26 01:13:55,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:13:55,667 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 137 transitions. [2022-11-26 01:13:55,667 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) [2022-11-26 01:13:55,668 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 137 transitions. [2022-11-26 01:13:55,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-26 01:13:55,669 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:13:55,669 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] [2022-11-26 01:13:55,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-26 01:13:55,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:13:55,877 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:13:55,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:13:55,878 INFO L85 PathProgramCache]: Analyzing trace with hash -159174357, now seen corresponding path program 22 times [2022-11-26 01:13:55,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:13:55,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345616691] [2022-11-26 01:13:55,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:13:55,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:13:55,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:56,385 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:13:56,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:13:56,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345616691] [2022-11-26 01:13:56,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345616691] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:13:56,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578427673] [2022-11-26 01:13:56,386 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:13:56,386 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:13:56,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:13:56,387 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:13:56,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-26 01:13:56,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:13:56,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-26 01:13:56,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:13:57,220 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-26 01:13:57,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:13:59,910 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 01:13:59,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578427673] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:13:59,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2131826404] [2022-11-26 01:13:59,912 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:13:59,912 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:13:59,912 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:13:59,913 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:13:59,913 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18, 23] total 38 [2022-11-26 01:13:59,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030692806] [2022-11-26 01:13:59,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:13:59,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-26 01:13:59,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:13:59,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-26 01:13:59,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1302, Unknown=0, NotChecked=0, Total=1406 [2022-11-26 01:13:59,916 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) [2022-11-26 01:14:00,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:14:00,665 INFO L93 Difference]: Finished difference Result 134 states and 173 transitions. [2022-11-26 01:14:00,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-26 01:14:00,666 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 [2022-11-26 01:14:00,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:14:00,667 INFO L225 Difference]: With dead ends: 134 [2022-11-26 01:14:00,667 INFO L226 Difference]: Without dead ends: 130 [2022-11-26 01:14:00,668 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 [2022-11-26 01:14:00,668 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 91 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 721 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 01:14:00,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 512 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 721 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:14:00,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-11-26 01:14:00,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 110. [2022-11-26 01:14:00,681 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) [2022-11-26 01:14:00,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 142 transitions. [2022-11-26 01:14:00,682 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 142 transitions. Word has length 65 [2022-11-26 01:14:00,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:14:00,682 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 142 transitions. [2022-11-26 01:14:00,683 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) [2022-11-26 01:14:00,683 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 142 transitions. [2022-11-26 01:14:00,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-26 01:14:00,684 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:14:00,684 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] [2022-11-26 01:14:00,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-26 01:14:00,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:14:00,892 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:14:00,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:14:00,893 INFO L85 PathProgramCache]: Analyzing trace with hash 1651550335, now seen corresponding path program 8 times [2022-11-26 01:14:00,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:14:00,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [163636407] [2022-11-26 01:14:00,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:14:00,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:14:00,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:14:01,554 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 3 proven. 84 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-26 01:14:01,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:14:01,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [163636407] [2022-11-26 01:14:01,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [163636407] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:14:01,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571745524] [2022-11-26 01:14:01,555 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:14:01,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:14:01,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:14:01,556 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:14:01,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-26 01:14:02,060 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-26 01:14:02,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:14:02,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-26 01:14:02,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:14:02,599 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 10 proven. 55 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-26 01:14:02,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:14:05,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571745524] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:14:05,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1210804023] [2022-11-26 01:14:05,927 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-26 01:14:05,928 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:14:05,928 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:14:05,928 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:14:05,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22] total 37 [2022-11-26 01:14:05,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842812540] [2022-11-26 01:14:05,928 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:14:05,929 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-26 01:14:05,929 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:14:05,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-26 01:14:05,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2121, Unknown=0, NotChecked=0, Total=2256 [2022-11-26 01:14:05,930 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) [2022-11-26 01:14:07,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:14:07,217 INFO L93 Difference]: Finished difference Result 142 states and 185 transitions. [2022-11-26 01:14:07,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-26 01:14:07,218 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 [2022-11-26 01:14:07,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:14:07,219 INFO L225 Difference]: With dead ends: 142 [2022-11-26 01:14:07,220 INFO L226 Difference]: Without dead ends: 138 [2022-11-26 01:14:07,220 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 [2022-11-26 01:14:07,221 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 87 mSDsluCounter, 607 mSDsCounter, 0 mSdLazyCounter, 1022 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 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 [2022-11-26 01:14:07,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 637 Invalid, 1065 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 1022 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-26 01:14:07,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-11-26 01:14:07,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 112. [2022-11-26 01:14:07,234 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) [2022-11-26 01:14:07,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2022-11-26 01:14:07,235 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 73 [2022-11-26 01:14:07,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:14:07,235 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2022-11-26 01:14:07,235 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) [2022-11-26 01:14:07,236 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2022-11-26 01:14:07,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-26 01:14:07,237 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:14:07,237 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] [2022-11-26 01:14:07,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-26 01:14:07,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:14:07,445 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:14:07,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:14:07,446 INFO L85 PathProgramCache]: Analyzing trace with hash -847125473, now seen corresponding path program 23 times [2022-11-26 01:14:07,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:14:07,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246759298] [2022-11-26 01:14:07,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:14:07,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:14:07,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:14:08,111 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-26 01:14:08,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:14:08,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246759298] [2022-11-26 01:14:08,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246759298] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:14:08,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548745140] [2022-11-26 01:14:08,112 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:14:08,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:14:08,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:14:08,116 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:14:08,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-26 01:14:08,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-26 01:14:08,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:14:08,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-26 01:14:08,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:14:09,115 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 18 proven. 36 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-26 01:14:09,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:14:12,859 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-26 01:14:12,859 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [548745140] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:14:12,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2058586675] [2022-11-26 01:14:12,860 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:14:12,860 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:14:12,861 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:14:12,861 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:14:12,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 24] total 39 [2022-11-26 01:14:12,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416307894] [2022-11-26 01:14:12,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:14:12,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-26 01:14:12,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:14:12,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-26 01:14:12,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1376, Unknown=0, NotChecked=0, Total=1482 [2022-11-26 01:14:12,863 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) [2022-11-26 01:14:13,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:14:13,664 INFO L93 Difference]: Finished difference Result 145 states and 189 transitions. [2022-11-26 01:14:13,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-26 01:14:13,664 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 [2022-11-26 01:14:13,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:14:13,666 INFO L225 Difference]: With dead ends: 145 [2022-11-26 01:14:13,666 INFO L226 Difference]: Without dead ends: 141 [2022-11-26 01:14:13,667 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 [2022-11-26 01:14:13,667 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 101 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 691 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 691 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 01:14:13,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 496 Invalid, 734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 691 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:14:13,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-26 01:14:13,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 120. [2022-11-26 01:14:13,682 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) [2022-11-26 01:14:13,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 158 transitions. [2022-11-26 01:14:13,683 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 158 transitions. Word has length 73 [2022-11-26 01:14:13,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:14:13,683 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 158 transitions. [2022-11-26 01:14:13,684 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) [2022-11-26 01:14:13,684 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 158 transitions. [2022-11-26 01:14:13,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-26 01:14:13,685 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:14:13,685 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] [2022-11-26 01:14:13,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-26 01:14:13,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:14:13,895 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:14:13,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:14:13,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1820043297, now seen corresponding path program 24 times [2022-11-26 01:14:13,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:14:13,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068765184] [2022-11-26 01:14:13,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:14:13,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:14:13,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:14:14,495 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 3 proven. 71 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-26 01:14:14,495 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:14:14,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068765184] [2022-11-26 01:14:14,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068765184] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:14:14,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102086767] [2022-11-26 01:14:14,496 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:14:14,496 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:14:14,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:14:14,497 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:14:14,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-26 01:14:15,049 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:14:15,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:14:15,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-26 01:14:15,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:14:15,729 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 18 proven. 41 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-26 01:14:15,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:14:19,614 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 9 proven. 73 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-26 01:14:19,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102086767] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:14:19,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [672676116] [2022-11-26 01:14:19,615 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:14:19,615 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:14:19,615 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:14:19,617 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:14:19,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 21, 27] total 53 [2022-11-26 01:14:19,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585231236] [2022-11-26 01:14:19,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:14:19,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-26 01:14:19,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:14:19,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-26 01:14:19,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=2585, Unknown=0, NotChecked=0, Total=2756 [2022-11-26 01:14:19,619 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) [2022-11-26 01:14:20,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:14:20,750 INFO L93 Difference]: Finished difference Result 171 states and 229 transitions. [2022-11-26 01:14:20,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-26 01:14:20,751 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 [2022-11-26 01:14:20,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:14:20,752 INFO L225 Difference]: With dead ends: 171 [2022-11-26 01:14:20,753 INFO L226 Difference]: Without dead ends: 167 [2022-11-26 01:14:20,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 112 SyntacticMatches, 9 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 880 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=401, Invalid=4021, Unknown=0, NotChecked=0, Total=4422 [2022-11-26 01:14:20,754 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 114 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 996 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 1071 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-26 01:14:20,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 630 Invalid, 1071 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 996 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-26 01:14:20,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-11-26 01:14:20,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 128. [2022-11-26 01:14:20,769 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) [2022-11-26 01:14:20,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 169 transitions. [2022-11-26 01:14:20,770 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 169 transitions. Word has length 73 [2022-11-26 01:14:20,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:14:20,771 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 169 transitions. [2022-11-26 01:14:20,771 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) [2022-11-26 01:14:20,771 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 169 transitions. [2022-11-26 01:14:20,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-26 01:14:20,772 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:14:20,773 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] [2022-11-26 01:14:20,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-26 01:14:20,980 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-26 01:14:20,981 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:14:20,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:14:20,981 INFO L85 PathProgramCache]: Analyzing trace with hash -1657692865, now seen corresponding path program 25 times [2022-11-26 01:14:20,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:14:20,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868774955] [2022-11-26 01:14:20,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:14:20,982 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:14:21,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:14:21,832 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-26 01:14:21,832 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:14:21,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868774955] [2022-11-26 01:14:21,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [868774955] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:14:21,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022987344] [2022-11-26 01:14:21,832 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:14:21,833 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:14:21,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:14:21,836 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:14:21,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-26 01:14:22,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:14:22,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-26 01:14:22,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:14:23,355 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 14 proven. 38 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-26 01:14:23,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:14:48,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1022987344] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:14:48,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1296378969] [2022-11-26 01:14:48,837 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:14:48,837 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:14:48,837 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:14:48,837 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:14:48,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 22] total 43 [2022-11-26 01:14:48,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385430730] [2022-11-26 01:14:48,838 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:14:48,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-26 01:14:48,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:14:48,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-26 01:14:48,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3230, Unknown=10, NotChecked=0, Total=3422 [2022-11-26 01:14:48,839 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) [2022-11-26 01:14:50,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:14:50,296 INFO L93 Difference]: Finished difference Result 194 states and 262 transitions. [2022-11-26 01:14:50,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-26 01:14:50,297 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 [2022-11-26 01:14:50,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:14:50,298 INFO L225 Difference]: With dead ends: 194 [2022-11-26 01:14:50,298 INFO L226 Difference]: Without dead ends: 190 [2022-11-26 01:14:50,299 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 84 SyntacticMatches, 4 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=457, Invalid=5083, Unknown=10, NotChecked=0, Total=5550 [2022-11-26 01:14:50,300 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 62 mSDsluCounter, 730 mSDsCounter, 0 mSdLazyCounter, 1273 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 763 SdHoareTripleChecker+Invalid, 1314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-26 01:14:50,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 763 Invalid, 1314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 1273 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-26 01:14:50,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-11-26 01:14:50,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 115. [2022-11-26 01:14:50,314 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) [2022-11-26 01:14:50,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 149 transitions. [2022-11-26 01:14:50,315 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 149 transitions. Word has length 73 [2022-11-26 01:14:50,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:14:50,315 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 149 transitions. [2022-11-26 01:14:50,316 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) [2022-11-26 01:14:50,316 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 149 transitions. [2022-11-26 01:14:50,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-26 01:14:50,317 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:14:50,317 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] [2022-11-26 01:14:50,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-11-26 01:14:50,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-26 01:14:50,524 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:14:50,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:14:50,524 INFO L85 PathProgramCache]: Analyzing trace with hash -684775041, now seen corresponding path program 26 times [2022-11-26 01:14:50,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:14:50,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870056444] [2022-11-26 01:14:50,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:14:50,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:14:50,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:14:51,073 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-26 01:14:51,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:14:51,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870056444] [2022-11-26 01:14:51,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870056444] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:14:51,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723554772] [2022-11-26 01:14:51,073 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:14:51,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:14:51,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:14:51,074 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:14:51,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-26 01:14:51,673 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-26 01:14:51,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:14:51,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-26 01:14:51,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:14:52,330 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 18 proven. 35 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-26 01:14:52,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:14:56,774 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 3 proven. 77 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-26 01:14:56,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723554772] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:14:56,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1979959901] [2022-11-26 01:14:56,776 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:14:56,776 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:14:56,776 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:14:56,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:14:56,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 27] total 59 [2022-11-26 01:14:56,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228891673] [2022-11-26 01:14:56,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:14:56,778 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-26 01:14:56,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:14:56,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-26 01:14:56,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3255, Unknown=0, NotChecked=0, Total=3422 [2022-11-26 01:14:56,779 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) [2022-11-26 01:14:58,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:14:58,780 INFO L93 Difference]: Finished difference Result 175 states and 230 transitions. [2022-11-26 01:14:58,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-26 01:14:58,781 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 [2022-11-26 01:14:58,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:14:58,782 INFO L225 Difference]: With dead ends: 175 [2022-11-26 01:14:58,782 INFO L226 Difference]: Without dead ends: 171 [2022-11-26 01:14:58,784 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 110 SyntacticMatches, 4 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=466, Invalid=5696, Unknown=0, NotChecked=0, Total=6162 [2022-11-26 01:14:58,784 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 33 mSDsluCounter, 877 mSDsCounter, 0 mSdLazyCounter, 1612 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 907 SdHoareTripleChecker+Invalid, 1624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-26 01:14:58,784 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 907 Invalid, 1624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1612 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-26 01:14:58,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-11-26 01:14:58,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 118. [2022-11-26 01:14:58,798 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) [2022-11-26 01:14:58,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2022-11-26 01:14:58,799 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 73 [2022-11-26 01:14:58,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:14:58,799 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2022-11-26 01:14:58,799 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) [2022-11-26 01:14:58,800 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2022-11-26 01:14:58,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-26 01:14:58,801 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:14:58,801 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] [2022-11-26 01:14:58,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-26 01:14:59,008 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-26 01:14:59,008 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:14:59,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:14:59,009 INFO L85 PathProgramCache]: Analyzing trace with hash 826199583, now seen corresponding path program 27 times [2022-11-26 01:14:59,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:14:59,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530143357] [2022-11-26 01:14:59,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:14:59,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:14:59,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:14:59,796 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 82 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-26 01:14:59,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:14:59,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530143357] [2022-11-26 01:14:59,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530143357] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:14:59,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199689014] [2022-11-26 01:14:59,797 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:14:59,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:14:59,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:14:59,798 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:14:59,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-26 01:15:00,495 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:15:00,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:15:00,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-26 01:15:00,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:15:01,367 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 24 proven. 36 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-11-26 01:15:01,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:15:26,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199689014] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:15:26,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [140895879] [2022-11-26 01:15:26,641 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:15:26,641 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:15:26,642 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:15:26,642 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:15:26,642 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 22] total 44 [2022-11-26 01:15:26,642 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884726887] [2022-11-26 01:15:26,642 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:15:26,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-26 01:15:26,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:15:26,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-26 01:15:26,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=3221, Unknown=6, NotChecked=0, Total=3422 [2022-11-26 01:15:26,644 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand has 44 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 34 states have internal predecessors, (79), 13 states have call successors, (14), 1 states have call predecessors, (14), 14 states have return successors, (18), 14 states have call predecessors, (18), 13 states have call successors, (18) [2022-11-26 01:15:27,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:15:27,988 INFO L93 Difference]: Finished difference Result 212 states and 288 transitions. [2022-11-26 01:15:27,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-26 01:15:27,989 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 34 states have internal predecessors, (79), 13 states have call successors, (14), 1 states have call predecessors, (14), 14 states have return successors, (18), 14 states have call predecessors, (18), 13 states have call successors, (18) Word has length 73 [2022-11-26 01:15:27,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:15:27,990 INFO L225 Difference]: With dead ends: 212 [2022-11-26 01:15:27,990 INFO L226 Difference]: Without dead ends: 208 [2022-11-26 01:15:27,991 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 83 SyntacticMatches, 5 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 853 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=475, Invalid=4921, Unknown=6, NotChecked=0, Total=5402 [2022-11-26 01:15:27,991 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 83 mSDsluCounter, 692 mSDsCounter, 0 mSdLazyCounter, 1110 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 1172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 1110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-26 01:15:27,991 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 722 Invalid, 1172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 1110 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-26 01:15:27,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-11-26 01:15:28,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 118. [2022-11-26 01:15:28,007 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) [2022-11-26 01:15:28,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2022-11-26 01:15:28,008 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 73 [2022-11-26 01:15:28,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:15:28,009 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2022-11-26 01:15:28,009 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 34 states have internal predecessors, (79), 13 states have call successors, (14), 1 states have call predecessors, (14), 14 states have return successors, (18), 14 states have call predecessors, (18), 13 states have call successors, (18) [2022-11-26 01:15:28,009 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2022-11-26 01:15:28,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-26 01:15:28,010 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:15:28,010 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] [2022-11-26 01:15:28,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-26 01:15:28,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-26 01:15:28,218 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:15:28,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:15:28,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1672476225, now seen corresponding path program 28 times [2022-11-26 01:15:28,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:15:28,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586575155] [2022-11-26 01:15:28,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:15:28,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:15:28,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:15:28,662 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-26 01:15:28,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:15:28,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586575155] [2022-11-26 01:15:28,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586575155] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:15:28,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448368258] [2022-11-26 01:15:28,663 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:15:28,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:15:28,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:15:28,664 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:15:28,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-26 01:15:29,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:15:29,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-26 01:15:29,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:15:29,967 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 24 proven. 32 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-26 01:15:29,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:15:40,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448368258] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:15:40,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1143217211] [2022-11-26 01:15:40,876 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:15:40,877 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:15:40,877 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:15:40,877 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:15:40,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20] total 36 [2022-11-26 01:15:40,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236464160] [2022-11-26 01:15:40,877 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:15:40,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-26 01:15:40,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:15:40,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-26 01:15:40,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1840, Unknown=3, NotChecked=0, Total=1980 [2022-11-26 01:15:40,879 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand has 36 states, 33 states have (on average 2.0) internal successors, (66), 26 states have internal predecessors, (66), 11 states have call successors, (12), 1 states have call predecessors, (12), 12 states have return successors, (18), 14 states have call predecessors, (18), 11 states have call successors, (18) [2022-11-26 01:15:41,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:15:41,899 INFO L93 Difference]: Finished difference Result 206 states and 280 transitions. [2022-11-26 01:15:41,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-26 01:15:41,900 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.0) internal successors, (66), 26 states have internal predecessors, (66), 11 states have call successors, (12), 1 states have call predecessors, (12), 12 states have return successors, (18), 14 states have call predecessors, (18), 11 states have call successors, (18) Word has length 73 [2022-11-26 01:15:41,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:15:41,901 INFO L225 Difference]: With dead ends: 206 [2022-11-26 01:15:41,901 INFO L226 Difference]: Without dead ends: 202 [2022-11-26 01:15:41,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 90 SyntacticMatches, 10 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=339, Invalid=3080, Unknown=3, NotChecked=0, Total=3422 [2022-11-26 01:15:41,903 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 76 mSDsluCounter, 446 mSDsCounter, 0 mSdLazyCounter, 771 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 474 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 771 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 01:15:41,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 474 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 771 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:15:41,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2022-11-26 01:15:41,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 120. [2022-11-26 01:15:41,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 83 states have (on average 1.072289156626506) internal successors, (89), 79 states have internal predecessors, (89), 10 states have call successors, (10), 4 states have call predecessors, (10), 26 states have return successors, (59), 36 states have call predecessors, (59), 10 states have call successors, (59) [2022-11-26 01:15:41,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 158 transitions. [2022-11-26 01:15:41,919 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 158 transitions. Word has length 73 [2022-11-26 01:15:41,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:15:41,919 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 158 transitions. [2022-11-26 01:15:41,920 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.0) internal successors, (66), 26 states have internal predecessors, (66), 11 states have call successors, (12), 1 states have call predecessors, (12), 12 states have return successors, (18), 14 states have call predecessors, (18), 11 states have call successors, (18) [2022-11-26 01:15:41,920 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 158 transitions. [2022-11-26 01:15:41,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-26 01:15:41,921 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:15:41,921 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] [2022-11-26 01:15:41,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-26 01:15:42,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-26 01:15:42,129 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:15:42,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:15:42,129 INFO L85 PathProgramCache]: Analyzing trace with hash 1811923679, now seen corresponding path program 29 times [2022-11-26 01:15:42,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:15:42,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117651780] [2022-11-26 01:15:42,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:15:42,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:15:42,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:15:42,631 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-26 01:15:42,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:15:42,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117651780] [2022-11-26 01:15:42,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117651780] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:15:42,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623226939] [2022-11-26 01:15:42,632 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:15:42,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:15:42,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:15:42,635 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:15:42,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-26 01:15:43,333 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-26 01:15:43,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:15:43,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-26 01:15:43,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:15:43,993 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 11 proven. 38 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-26 01:15:43,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:15:47,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623226939] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:15:47,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [470556435] [2022-11-26 01:15:47,349 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:15:47,350 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:15:47,350 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:15:47,350 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:15:47,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 21] total 40 [2022-11-26 01:15:47,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173429534] [2022-11-26 01:15:47,351 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:15:47,351 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-26 01:15:47,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:15:47,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-26 01:15:47,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2121, Unknown=0, NotChecked=0, Total=2256 [2022-11-26 01:15:47,352 INFO L87 Difference]: Start difference. First operand 120 states and 158 transitions. Second operand has 40 states, 37 states have (on average 2.027027027027027) internal successors, (75), 30 states have internal predecessors, (75), 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) [2022-11-26 01:15:48,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:15:48,857 INFO L93 Difference]: Finished difference Result 177 states and 240 transitions. [2022-11-26 01:15:48,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-26 01:15:48,858 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 37 states have (on average 2.027027027027027) internal successors, (75), 30 states have internal predecessors, (75), 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 [2022-11-26 01:15:48,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:15:48,859 INFO L225 Difference]: With dead ends: 177 [2022-11-26 01:15:48,859 INFO L226 Difference]: Without dead ends: 173 [2022-11-26 01:15:48,860 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=346, Invalid=3944, Unknown=0, NotChecked=0, Total=4290 [2022-11-26 01:15:48,861 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 69 mSDsluCounter, 842 mSDsCounter, 0 mSdLazyCounter, 1596 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 878 SdHoareTripleChecker+Invalid, 1622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-26 01:15:48,861 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 878 Invalid, 1622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 1596 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-26 01:15:48,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-26 01:15:48,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 110. [2022-11-26 01:15:48,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 73 states have internal predecessors, (82), 10 states have call successors, (10), 4 states have call predecessors, (10), 23 states have return successors, (52), 32 states have call predecessors, (52), 10 states have call successors, (52) [2022-11-26 01:15:48,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 144 transitions. [2022-11-26 01:15:48,877 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 144 transitions. Word has length 73 [2022-11-26 01:15:48,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:15:48,877 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 144 transitions. [2022-11-26 01:15:48,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 37 states have (on average 2.027027027027027) internal successors, (75), 30 states have internal predecessors, (75), 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) [2022-11-26 01:15:48,878 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 144 transitions. [2022-11-26 01:15:48,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-26 01:15:48,879 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:15:48,879 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] [2022-11-26 01:15:48,891 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-11-26 01:15:49,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-26 01:15:49,087 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:15:49,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:15:49,087 INFO L85 PathProgramCache]: Analyzing trace with hash -1510125793, now seen corresponding path program 30 times [2022-11-26 01:15:49,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:15:49,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585409109] [2022-11-26 01:15:49,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:15:49,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:15:49,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:15:49,640 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-26 01:15:49,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:15:49,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585409109] [2022-11-26 01:15:49,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [585409109] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:15:49,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028966868] [2022-11-26 01:15:49,641 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 01:15:49,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:15:49,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:15:49,642 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:15:49,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-26 01:15:50,348 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 01:15:50,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:15:50,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-26 01:15:50,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:15:50,717 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 18 proven. 36 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-11-26 01:15:50,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:15:54,324 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-26 01:15:54,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028966868] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 01:15:54,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60593467] [2022-11-26 01:15:54,325 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:15:54,326 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:15:54,326 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:15:54,327 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 01:15:54,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19, 24] total 39 [2022-11-26 01:15:54,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553826848] [2022-11-26 01:15:54,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 01:15:54,328 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-26 01:15:54,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:15:54,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-26 01:15:54,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1376, Unknown=0, NotChecked=0, Total=1482 [2022-11-26 01:15:54,329 INFO L87 Difference]: Start difference. First operand 110 states and 144 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) [2022-11-26 01:15:55,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:15:55,084 INFO L93 Difference]: Finished difference Result 145 states and 188 transitions. [2022-11-26 01:15:55,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-26 01:15:55,085 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 [2022-11-26 01:15:55,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:15:55,086 INFO L225 Difference]: With dead ends: 145 [2022-11-26 01:15:55,086 INFO L226 Difference]: Without dead ends: 141 [2022-11-26 01:15:55,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 118 SyntacticMatches, 15 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=255, Invalid=2295, Unknown=0, NotChecked=0, Total=2550 [2022-11-26 01:15:55,088 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 66 mSDsluCounter, 525 mSDsCounter, 0 mSdLazyCounter, 782 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 556 SdHoareTripleChecker+Invalid, 806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 782 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 01:15:55,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 556 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 782 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:15:55,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-26 01:15:55,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 114. [2022-11-26 01:15:55,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 79 states have (on average 1.0759493670886076) internal successors, (85), 75 states have internal predecessors, (85), 10 states have call successors, (10), 4 states have call predecessors, (10), 24 states have return successors, (54), 34 states have call predecessors, (54), 10 states have call successors, (54) [2022-11-26 01:15:55,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 149 transitions. [2022-11-26 01:15:55,102 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 149 transitions. Word has length 73 [2022-11-26 01:15:55,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:15:55,102 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 149 transitions. [2022-11-26 01:15:55,102 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) [2022-11-26 01:15:55,102 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 149 transitions. [2022-11-26 01:15:55,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-26 01:15:55,103 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:15:55,104 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 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, 1, 1, 1, 1] [2022-11-26 01:15:55,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-26 01:15:55,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2022-11-26 01:15:55,312 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:15:55,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:15:55,312 INFO L85 PathProgramCache]: Analyzing trace with hash 137034315, now seen corresponding path program 31 times [2022-11-26 01:15:55,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:15:55,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837260337] [2022-11-26 01:15:55,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:15:55,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:15:55,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:15:55,955 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 5 proven. 100 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-26 01:15:55,956 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:15:55,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837260337] [2022-11-26 01:15:55,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837260337] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:15:55,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305882107] [2022-11-26 01:15:55,956 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 01:15:55,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:15:55,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:15:55,957 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:15:55,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-26 01:15:56,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:15:56,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-26 01:15:56,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:15:57,136 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 28 proven. 54 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-26 01:15:57,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 01:16:01,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305882107] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:16:01,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2113014208] [2022-11-26 01:16:01,911 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-26 01:16:01,912 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 01:16:01,912 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:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java: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) [2022-11-26 01:16:01,912 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 01:16:01,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22] total 35 [2022-11-26 01:16:01,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549474180] [2022-11-26 01:16:01,913 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 01:16:01,913 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-26 01:16:01,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 01:16:01,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-26 01:16:01,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2022-11-26 01:16:01,914 INFO L87 Difference]: Start difference. First operand 114 states and 149 transitions. Second operand has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 27 states have internal predecessors, (73), 12 states have call successors, (13), 1 states have call predecessors, (13), 12 states have return successors, (17), 12 states have call predecessors, (17), 12 states have call successors, (17) [2022-11-26 01:16:02,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 01:16:02,999 INFO L93 Difference]: Finished difference Result 160 states and 208 transitions. [2022-11-26 01:16:02,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-26 01:16:02,999 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 27 states have internal predecessors, (73), 12 states have call successors, (13), 1 states have call predecessors, (13), 12 states have return successors, (17), 12 states have call predecessors, (17), 12 states have call successors, (17) Word has length 81 [2022-11-26 01:16:03,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 01:16:03,001 INFO L225 Difference]: With dead ends: 160 [2022-11-26 01:16:03,001 INFO L226 Difference]: Without dead ends: 156 [2022-11-26 01:16:03,001 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 102 SyntacticMatches, 9 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=409, Invalid=3373, Unknown=0, NotChecked=0, Total=3782 [2022-11-26 01:16:03,002 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 64 mSDsluCounter, 540 mSDsCounter, 0 mSdLazyCounter, 880 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 916 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 880 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-26 01:16:03,002 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 571 Invalid, 916 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 880 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-26 01:16:03,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-11-26 01:16:03,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 104. [2022-11-26 01:16:03,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 72 states have (on average 1.0833333333333333) internal successors, (78), 69 states have internal predecessors, (78), 10 states have call successors, (10), 4 states have call predecessors, (10), 21 states have return successors, (45), 30 states have call predecessors, (45), 10 states have call successors, (45) [2022-11-26 01:16:03,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 133 transitions. [2022-11-26 01:16:03,015 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 133 transitions. Word has length 81 [2022-11-26 01:16:03,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 01:16:03,016 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 133 transitions. [2022-11-26 01:16:03,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 27 states have internal predecessors, (73), 12 states have call successors, (13), 1 states have call predecessors, (13), 12 states have return successors, (17), 12 states have call predecessors, (17), 12 states have call successors, (17) [2022-11-26 01:16:03,016 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 133 transitions. [2022-11-26 01:16:03,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-26 01:16:03,017 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 01:16:03,017 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 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] [2022-11-26 01:16:03,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-26 01:16:03,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:16:03,226 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [gcdErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 01:16:03,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 01:16:03,226 INFO L85 PathProgramCache]: Analyzing trace with hash 1152175499, now seen corresponding path program 32 times [2022-11-26 01:16:03,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 01:16:03,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019442379] [2022-11-26 01:16:03,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 01:16:03,227 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 01:16:03,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 01:16:03,890 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-26 01:16:03,890 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 01:16:03,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019442379] [2022-11-26 01:16:03,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019442379] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 01:16:03,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [220976036] [2022-11-26 01:16:03,890 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 01:16:03,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 01:16:03,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 01:16:03,895 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 01:16:03,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17d540c6-dc68-4287-a77a-cd7f30b67d05/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-26 01:16:04,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-26 01:16:04,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 01:16:04,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 51 conjunts are in the unsatisfiable core [2022-11-26 01:16:04,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 01:16:05,538 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 26 proven. 55 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2022-11-26 01:16:05,539 INFO L328 TraceCheckSpWp]: Computing backward predicates...