./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8 --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 5c011d5a0fba56387056dfb1e4fd33cceb66b52965c25e0a625e04747833af64 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:00:38,388 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:00:38,392 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:00:38,460 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:00:38,461 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:00:38,466 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:00:38,468 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:00:38,473 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:00:38,476 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:00:38,483 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:00:38,484 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:00:38,487 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:00:38,487 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:00:38,490 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:00:38,493 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:00:38,498 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:00:38,504 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:00:38,505 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:00:38,512 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:00:38,515 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:00:38,517 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:00:38,519 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:00:38,520 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:00:38,521 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:00:38,525 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:00:38,526 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:00:38,526 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:00:38,527 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:00:38,528 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:00:38,529 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:00:38,530 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:00:38,531 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:00:38,532 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:00:38,533 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:00:38,534 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:00:38,534 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:00:38,535 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:00:38,535 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:00:38,535 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:00:38,536 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:00:38,537 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:00:38,538 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:00:38,567 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:00:38,568 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:00:38,569 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:00:38,569 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:00:38,569 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:00:38,569 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:00:38,570 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:00:38,570 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:00:38,570 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:00:38,570 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:00:38,571 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:00:38,571 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:00:38,571 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:00:38,571 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:00:38,572 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:00:38,572 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:00:38,573 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:00:38,573 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:00:38,573 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:00:38,573 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:00:38,574 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:00:38,574 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:00:38,574 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:00:38,574 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:00:38,575 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:00:38,575 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:00:38,575 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:00:38,575 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:00:38,576 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:00:38,576 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:00:38,576 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:00:38,576 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:00:38,576 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:00:38,577 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:00:38,577 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:00:38,577 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:00:38,577 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:00:38,578 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:00:38,578 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:00:38,578 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5c011d5a0fba56387056dfb1e4fd33cceb66b52965c25e0a625e04747833af64 [2021-11-07 01:00:38,858 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:00:38,883 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:00:38,886 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:00:38,888 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:00:38,889 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:00:38,890 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-07 01:00:38,983 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/data/a67d18fbb/0b8f885dd69346679db55289831c5f7d/FLAG41ab195c9 [2021-11-07 01:00:39,650 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:00:39,662 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-07 01:00:39,685 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/data/a67d18fbb/0b8f885dd69346679db55289831c5f7d/FLAG41ab195c9 [2021-11-07 01:00:39,930 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/data/a67d18fbb/0b8f885dd69346679db55289831c5f7d [2021-11-07 01:00:39,933 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:00:39,935 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:00:39,937 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:00:39,937 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:00:39,941 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:00:39,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:00:39" (1/1) ... [2021-11-07 01:00:39,943 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ca1537c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:39, skipping insertion in model container [2021-11-07 01:00:39,943 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:00:39" (1/1) ... [2021-11-07 01:00:39,952 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:00:40,007 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:00:40,309 WARN L228 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_180b98ea-f9bc-492b-b65d-cfe791b62e1c/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[7349,7362] [2021-11-07 01:00:40,345 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:00:40,364 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:00:40,447 WARN L228 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_180b98ea-f9bc-492b-b65d-cfe791b62e1c/sv-benchmarks/c/seq-mthreaded-reduced/pals_floodmax.3.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c[7349,7362] [2021-11-07 01:00:40,488 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:00:40,527 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:00:40,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40 WrapperNode [2021-11-07 01:00:40,528 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:00:40,530 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:00:40,531 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:00:40,531 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:00:40,540 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,571 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,632 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:00:40,633 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:00:40,633 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:00:40,634 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:00:40,643 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,644 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,648 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,649 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,661 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,668 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,671 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,677 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:00:40,678 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:00:40,679 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:00:40,679 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:00:40,680 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (1/1) ... [2021-11-07 01:00:40,690 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:00:40,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:00:40,718 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:00:40,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:00:40,771 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:00:40,771 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:00:40,771 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:00:40,771 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:00:42,626 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:00:42,627 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 01:00:42,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:00:42 BoogieIcfgContainer [2021-11-07 01:00:42,630 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:00:42,641 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:00:42,642 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:00:42,646 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:00:42,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:00:39" (1/3) ... [2021-11-07 01:00:42,648 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17ca7b6b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:00:42, skipping insertion in model container [2021-11-07 01:00:42,648 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:00:40" (2/3) ... [2021-11-07 01:00:42,649 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17ca7b6b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:00:42, skipping insertion in model container [2021-11-07 01:00:42,649 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:00:42" (3/3) ... [2021-11-07 01:00:42,651 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_floodmax.3.3.ufo.UNBOUNDED.pals.c.v+cfa-reducer.c [2021-11-07 01:00:42,659 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:00:42,660 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:00:42,720 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:00:42,728 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 01:00:42,728 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:00:42,749 INFO L276 IsEmpty]: Start isEmpty. Operand has 86 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 85 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:42,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-07 01:00:42,758 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:42,758 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:42,759 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:42,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:42,765 INFO L85 PathProgramCache]: Analyzing trace with hash 1768052657, now seen corresponding path program 1 times [2021-11-07 01:00:42,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:42,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716578084] [2021-11-07 01:00:42,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:42,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:42,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:43,144 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:43,145 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:43,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716578084] [2021-11-07 01:00:43,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716578084] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:43,146 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:43,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:00:43,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350973304] [2021-11-07 01:00:43,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:43,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:43,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:43,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:43,173 INFO L87 Difference]: Start difference. First operand has 86 states, 84 states have (on average 1.7619047619047619) internal successors, (148), 85 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:43,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:43,264 INFO L93 Difference]: Finished difference Result 188 states and 311 transitions. [2021-11-07 01:00:43,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:43,266 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-07 01:00:43,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:43,279 INFO L225 Difference]: With dead ends: 188 [2021-11-07 01:00:43,279 INFO L226 Difference]: Without dead ends: 127 [2021-11-07 01:00:43,282 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:43,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-07 01:00:43,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2021-11-07 01:00:43,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.5) internal successors, (186), 124 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:43,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 186 transitions. [2021-11-07 01:00:43,338 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 186 transitions. Word has length 37 [2021-11-07 01:00:43,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:43,339 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 186 transitions. [2021-11-07 01:00:43,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:43,339 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 186 transitions. [2021-11-07 01:00:43,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-07 01:00:43,341 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:43,342 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:43,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:00:43,342 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:43,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:43,343 INFO L85 PathProgramCache]: Analyzing trace with hash 938619083, now seen corresponding path program 1 times [2021-11-07 01:00:43,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:43,344 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240707665] [2021-11-07 01:00:43,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:43,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:43,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:43,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:43,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:43,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240707665] [2021-11-07 01:00:43,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240707665] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:43,512 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:43,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:00:43,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658374880] [2021-11-07 01:00:43,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:43,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:43,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:43,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:43,516 INFO L87 Difference]: Start difference. First operand 125 states and 186 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:43,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:43,584 INFO L93 Difference]: Finished difference Result 276 states and 431 transitions. [2021-11-07 01:00:43,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:43,586 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-07 01:00:43,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:43,593 INFO L225 Difference]: With dead ends: 276 [2021-11-07 01:00:43,594 INFO L226 Difference]: Without dead ends: 180 [2021-11-07 01:00:43,596 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:43,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-11-07 01:00:43,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2021-11-07 01:00:43,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 177 states have (on average 1.5197740112994351) internal successors, (269), 177 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:43,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 269 transitions. [2021-11-07 01:00:43,650 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 269 transitions. Word has length 39 [2021-11-07 01:00:43,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:43,651 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 269 transitions. [2021-11-07 01:00:43,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:43,652 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 269 transitions. [2021-11-07 01:00:43,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-07 01:00:43,654 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:43,654 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:43,655 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 01:00:43,655 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:43,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:43,658 INFO L85 PathProgramCache]: Analyzing trace with hash 2080335096, now seen corresponding path program 1 times [2021-11-07 01:00:43,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:43,661 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421555312] [2021-11-07 01:00:43,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:43,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:43,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:43,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:43,803 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:43,804 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421555312] [2021-11-07 01:00:43,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421555312] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:43,804 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:43,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:00:43,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230428787] [2021-11-07 01:00:43,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:43,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:43,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:43,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:43,807 INFO L87 Difference]: Start difference. First operand 178 states and 269 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:43,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:43,888 INFO L93 Difference]: Finished difference Result 438 states and 690 transitions. [2021-11-07 01:00:43,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:43,889 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-07 01:00:43,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:43,892 INFO L225 Difference]: With dead ends: 438 [2021-11-07 01:00:43,892 INFO L226 Difference]: Without dead ends: 290 [2021-11-07 01:00:43,894 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:43,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-11-07 01:00:43,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 288. [2021-11-07 01:00:43,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 287 states have (on average 1.5574912891986064) internal successors, (447), 287 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:43,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 447 transitions. [2021-11-07 01:00:43,941 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 447 transitions. Word has length 41 [2021-11-07 01:00:43,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:43,942 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 447 transitions. [2021-11-07 01:00:43,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:43,943 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 447 transitions. [2021-11-07 01:00:43,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-07 01:00:43,945 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:43,945 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:43,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 01:00:43,946 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:43,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:43,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1713059214, now seen corresponding path program 1 times [2021-11-07 01:00:43,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:43,947 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738624585] [2021-11-07 01:00:43,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:43,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:43,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:44,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:44,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:44,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738624585] [2021-11-07 01:00:44,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738624585] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:44,082 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:44,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:00:44,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900049050] [2021-11-07 01:00:44,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:44,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:44,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:44,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:44,085 INFO L87 Difference]: Start difference. First operand 288 states and 447 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:44,157 INFO L93 Difference]: Finished difference Result 707 states and 1122 transitions. [2021-11-07 01:00:44,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:44,158 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-07 01:00:44,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:44,162 INFO L225 Difference]: With dead ends: 707 [2021-11-07 01:00:44,162 INFO L226 Difference]: Without dead ends: 449 [2021-11-07 01:00:44,165 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:44,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2021-11-07 01:00:44,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 447. [2021-11-07 01:00:44,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 446 states have (on average 1.5717488789237668) internal successors, (701), 446 states have internal predecessors, (701), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 701 transitions. [2021-11-07 01:00:44,236 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 701 transitions. Word has length 43 [2021-11-07 01:00:44,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:44,237 INFO L470 AbstractCegarLoop]: Abstraction has 447 states and 701 transitions. [2021-11-07 01:00:44,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,238 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 701 transitions. [2021-11-07 01:00:44,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 01:00:44,240 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:44,240 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:44,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 01:00:44,241 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:44,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:44,241 INFO L85 PathProgramCache]: Analyzing trace with hash -334539291, now seen corresponding path program 1 times [2021-11-07 01:00:44,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:44,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073950737] [2021-11-07 01:00:44,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:44,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:44,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:44,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:44,372 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:44,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073950737] [2021-11-07 01:00:44,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073950737] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:44,373 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:44,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:00:44,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211124260] [2021-11-07 01:00:44,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:44,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:44,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:44,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:44,377 INFO L87 Difference]: Start difference. First operand 447 states and 701 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:44,438 INFO L93 Difference]: Finished difference Result 1147 states and 1834 transitions. [2021-11-07 01:00:44,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:44,439 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-07 01:00:44,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:44,445 INFO L225 Difference]: With dead ends: 1147 [2021-11-07 01:00:44,445 INFO L226 Difference]: Without dead ends: 743 [2021-11-07 01:00:44,448 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:44,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 743 states. [2021-11-07 01:00:44,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 743 to 741. [2021-11-07 01:00:44,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 741 states, 740 states have (on average 1.5837837837837838) internal successors, (1172), 740 states have internal predecessors, (1172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 741 states to 741 states and 1172 transitions. [2021-11-07 01:00:44,523 INFO L78 Accepts]: Start accepts. Automaton has 741 states and 1172 transitions. Word has length 45 [2021-11-07 01:00:44,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:44,524 INFO L470 AbstractCegarLoop]: Abstraction has 741 states and 1172 transitions. [2021-11-07 01:00:44,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,524 INFO L276 IsEmpty]: Start isEmpty. Operand 741 states and 1172 transitions. [2021-11-07 01:00:44,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 01:00:44,526 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:44,527 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:44,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 01:00:44,527 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:44,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:44,528 INFO L85 PathProgramCache]: Analyzing trace with hash -312170093, now seen corresponding path program 1 times [2021-11-07 01:00:44,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:44,529 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629059880] [2021-11-07 01:00:44,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:44,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:44,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:44,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:44,610 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:44,611 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629059880] [2021-11-07 01:00:44,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629059880] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:44,611 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:44,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:00:44,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594670294] [2021-11-07 01:00:44,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:44,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:44,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:44,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:44,620 INFO L87 Difference]: Start difference. First operand 741 states and 1172 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:44,724 INFO L93 Difference]: Finished difference Result 1856 states and 2966 transitions. [2021-11-07 01:00:44,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:44,725 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-07 01:00:44,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:44,735 INFO L225 Difference]: With dead ends: 1856 [2021-11-07 01:00:44,735 INFO L226 Difference]: Without dead ends: 1158 [2021-11-07 01:00:44,738 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:44,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1158 states. [2021-11-07 01:00:44,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1158 to 1156. [2021-11-07 01:00:44,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1156 states, 1155 states have (on average 1.587012987012987) internal successors, (1833), 1155 states have internal predecessors, (1833), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1156 states to 1156 states and 1833 transitions. [2021-11-07 01:00:44,825 INFO L78 Accepts]: Start accepts. Automaton has 1156 states and 1833 transitions. Word has length 47 [2021-11-07 01:00:44,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:44,825 INFO L470 AbstractCegarLoop]: Abstraction has 1156 states and 1833 transitions. [2021-11-07 01:00:44,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,826 INFO L276 IsEmpty]: Start isEmpty. Operand 1156 states and 1833 transitions. [2021-11-07 01:00:44,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 01:00:44,831 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:44,832 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:44,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 01:00:44,833 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:44,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:44,833 INFO L85 PathProgramCache]: Analyzing trace with hash -1501020928, now seen corresponding path program 1 times [2021-11-07 01:00:44,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:44,839 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087695928] [2021-11-07 01:00:44,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:44,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:44,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:44,924 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:44,925 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:44,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087695928] [2021-11-07 01:00:44,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1087695928] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:44,925 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:44,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 01:00:44,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679061204] [2021-11-07 01:00:44,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:00:44,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:44,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:00:44,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:00:44,928 INFO L87 Difference]: Start difference. First operand 1156 states and 1833 transitions. Second operand has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:45,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:45,300 INFO L93 Difference]: Finished difference Result 2931 states and 4669 transitions. [2021-11-07 01:00:45,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:00:45,301 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-07 01:00:45,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:45,314 INFO L225 Difference]: With dead ends: 2931 [2021-11-07 01:00:45,314 INFO L226 Difference]: Without dead ends: 1831 [2021-11-07 01:00:45,317 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:00:45,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1831 states. [2021-11-07 01:00:45,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1831 to 1821. [2021-11-07 01:00:45,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1821 states, 1820 states have (on average 1.5785714285714285) internal successors, (2873), 1820 states have internal predecessors, (2873), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:45,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1821 states to 1821 states and 2873 transitions. [2021-11-07 01:00:45,454 INFO L78 Accepts]: Start accepts. Automaton has 1821 states and 2873 transitions. Word has length 49 [2021-11-07 01:00:45,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:45,455 INFO L470 AbstractCegarLoop]: Abstraction has 1821 states and 2873 transitions. [2021-11-07 01:00:45,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:45,456 INFO L276 IsEmpty]: Start isEmpty. Operand 1821 states and 2873 transitions. [2021-11-07 01:00:45,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 01:00:45,456 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:45,457 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:45,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 01:00:45,457 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:45,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:45,458 INFO L85 PathProgramCache]: Analyzing trace with hash 650487300, now seen corresponding path program 1 times [2021-11-07 01:00:45,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:45,459 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177699316] [2021-11-07 01:00:45,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:45,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:45,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:45,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:45,523 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:45,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177699316] [2021-11-07 01:00:45,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177699316] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:45,526 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:45,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:00:45,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532570691] [2021-11-07 01:00:45,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:00:45,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:45,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:00:45,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:00:45,528 INFO L87 Difference]: Start difference. First operand 1821 states and 2873 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:45,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:45,733 INFO L93 Difference]: Finished difference Result 3588 states and 5679 transitions. [2021-11-07 01:00:45,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:00:45,734 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-07 01:00:45,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:45,747 INFO L225 Difference]: With dead ends: 3588 [2021-11-07 01:00:45,747 INFO L226 Difference]: Without dead ends: 1823 [2021-11-07 01:00:45,751 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:00:45,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1823 states. [2021-11-07 01:00:45,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1823 to 1821. [2021-11-07 01:00:45,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1821 states, 1820 states have (on average 1.571978021978022) internal successors, (2861), 1820 states have internal predecessors, (2861), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:45,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1821 states to 1821 states and 2861 transitions. [2021-11-07 01:00:45,902 INFO L78 Accepts]: Start accepts. Automaton has 1821 states and 2861 transitions. Word has length 50 [2021-11-07 01:00:45,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:45,902 INFO L470 AbstractCegarLoop]: Abstraction has 1821 states and 2861 transitions. [2021-11-07 01:00:45,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:45,903 INFO L276 IsEmpty]: Start isEmpty. Operand 1821 states and 2861 transitions. [2021-11-07 01:00:45,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 01:00:45,904 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:45,905 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:45,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 01:00:45,905 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:45,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:45,906 INFO L85 PathProgramCache]: Analyzing trace with hash -1367676345, now seen corresponding path program 1 times [2021-11-07 01:00:45,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:45,906 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475446269] [2021-11-07 01:00:45,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:45,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:45,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:46,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:46,014 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:46,014 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475446269] [2021-11-07 01:00:46,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475446269] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:46,015 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:46,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:00:46,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971845194] [2021-11-07 01:00:46,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:00:46,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:46,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:00:46,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:00:46,028 INFO L87 Difference]: Start difference. First operand 1821 states and 2861 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:46,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:46,256 INFO L93 Difference]: Finished difference Result 3588 states and 5655 transitions. [2021-11-07 01:00:46,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:00:46,263 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 01:00:46,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:46,277 INFO L225 Difference]: With dead ends: 3588 [2021-11-07 01:00:46,277 INFO L226 Difference]: Without dead ends: 1823 [2021-11-07 01:00:46,280 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:00:46,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1823 states. [2021-11-07 01:00:46,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1823 to 1821. [2021-11-07 01:00:46,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1821 states, 1820 states have (on average 1.5653846153846154) internal successors, (2849), 1820 states have internal predecessors, (2849), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:46,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1821 states to 1821 states and 2849 transitions. [2021-11-07 01:00:46,420 INFO L78 Accepts]: Start accepts. Automaton has 1821 states and 2849 transitions. Word has length 51 [2021-11-07 01:00:46,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:46,421 INFO L470 AbstractCegarLoop]: Abstraction has 1821 states and 2849 transitions. [2021-11-07 01:00:46,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:46,421 INFO L276 IsEmpty]: Start isEmpty. Operand 1821 states and 2849 transitions. [2021-11-07 01:00:46,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 01:00:46,422 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:46,422 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:46,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-07 01:00:46,422 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:46,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:46,423 INFO L85 PathProgramCache]: Analyzing trace with hash 498318123, now seen corresponding path program 1 times [2021-11-07 01:00:46,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:46,425 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951199776] [2021-11-07 01:00:46,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:46,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:46,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:46,506 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:46,507 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:46,507 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951199776] [2021-11-07 01:00:46,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951199776] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:46,508 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:46,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:00:46,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609232382] [2021-11-07 01:00:46,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:00:46,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:46,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:00:46,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:00:46,510 INFO L87 Difference]: Start difference. First operand 1821 states and 2849 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:46,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:46,699 INFO L93 Difference]: Finished difference Result 3588 states and 5631 transitions. [2021-11-07 01:00:46,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:00:46,700 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 01:00:46,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:46,713 INFO L225 Difference]: With dead ends: 3588 [2021-11-07 01:00:46,713 INFO L226 Difference]: Without dead ends: 1823 [2021-11-07 01:00:46,721 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:00:46,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1823 states. [2021-11-07 01:00:46,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1823 to 1821. [2021-11-07 01:00:46,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1821 states, 1820 states have (on average 1.5587912087912088) internal successors, (2837), 1820 states have internal predecessors, (2837), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:46,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1821 states to 1821 states and 2837 transitions. [2021-11-07 01:00:46,873 INFO L78 Accepts]: Start accepts. Automaton has 1821 states and 2837 transitions. Word has length 52 [2021-11-07 01:00:46,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:46,874 INFO L470 AbstractCegarLoop]: Abstraction has 1821 states and 2837 transitions. [2021-11-07 01:00:46,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:46,875 INFO L276 IsEmpty]: Start isEmpty. Operand 1821 states and 2837 transitions. [2021-11-07 01:00:46,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 01:00:46,875 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:46,876 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:46,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 01:00:46,876 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:46,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:46,877 INFO L85 PathProgramCache]: Analyzing trace with hash 625035068, now seen corresponding path program 1 times [2021-11-07 01:00:46,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:46,877 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177032377] [2021-11-07 01:00:46,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:46,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:46,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:47,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:47,020 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:47,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177032377] [2021-11-07 01:00:47,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177032377] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:47,021 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:47,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 01:00:47,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33189888] [2021-11-07 01:00:47,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:00:47,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:47,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:00:47,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:00:47,023 INFO L87 Difference]: Start difference. First operand 1821 states and 2837 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:47,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:47,287 INFO L93 Difference]: Finished difference Result 3588 states and 5607 transitions. [2021-11-07 01:00:47,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:00:47,288 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-07 01:00:47,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:47,301 INFO L225 Difference]: With dead ends: 3588 [2021-11-07 01:00:47,301 INFO L226 Difference]: Without dead ends: 1823 [2021-11-07 01:00:47,305 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:00:47,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1823 states. [2021-11-07 01:00:47,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1823 to 1821. [2021-11-07 01:00:47,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1821 states, 1820 states have (on average 1.5543956043956044) internal successors, (2829), 1820 states have internal predecessors, (2829), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:47,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1821 states to 1821 states and 2829 transitions. [2021-11-07 01:00:47,455 INFO L78 Accepts]: Start accepts. Automaton has 1821 states and 2829 transitions. Word has length 54 [2021-11-07 01:00:47,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:47,456 INFO L470 AbstractCegarLoop]: Abstraction has 1821 states and 2829 transitions. [2021-11-07 01:00:47,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:47,456 INFO L276 IsEmpty]: Start isEmpty. Operand 1821 states and 2829 transitions. [2021-11-07 01:00:47,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 01:00:47,457 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:47,457 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:47,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 01:00:47,458 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:47,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:47,458 INFO L85 PathProgramCache]: Analyzing trace with hash -312065607, now seen corresponding path program 1 times [2021-11-07 01:00:47,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:47,458 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486963768] [2021-11-07 01:00:47,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:47,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:47,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:47,580 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:47,580 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:47,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486963768] [2021-11-07 01:00:47,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486963768] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:47,581 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:47,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 01:00:47,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410112533] [2021-11-07 01:00:47,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:00:47,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:47,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:00:47,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:00:47,583 INFO L87 Difference]: Start difference. First operand 1821 states and 2829 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:47,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:47,909 INFO L93 Difference]: Finished difference Result 4565 states and 7090 transitions. [2021-11-07 01:00:47,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:00:47,910 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-07 01:00:47,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:47,928 INFO L225 Difference]: With dead ends: 4565 [2021-11-07 01:00:47,929 INFO L226 Difference]: Without dead ends: 2800 [2021-11-07 01:00:47,933 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:00:47,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2800 states. [2021-11-07 01:00:48,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2800 to 2798. [2021-11-07 01:00:48,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2798 states, 2797 states have (on average 1.543081873435824) internal successors, (4316), 2797 states have internal predecessors, (4316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:48,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2798 states to 2798 states and 4316 transitions. [2021-11-07 01:00:48,211 INFO L78 Accepts]: Start accepts. Automaton has 2798 states and 4316 transitions. Word has length 57 [2021-11-07 01:00:48,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:48,212 INFO L470 AbstractCegarLoop]: Abstraction has 2798 states and 4316 transitions. [2021-11-07 01:00:48,212 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:48,213 INFO L276 IsEmpty]: Start isEmpty. Operand 2798 states and 4316 transitions. [2021-11-07 01:00:48,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-07 01:00:48,213 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:48,213 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:48,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-07 01:00:48,214 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:48,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:48,215 INFO L85 PathProgramCache]: Analyzing trace with hash -1074717730, now seen corresponding path program 1 times [2021-11-07 01:00:48,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:48,215 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841724085] [2021-11-07 01:00:48,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:48,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:48,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:48,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:48,345 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:48,345 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841724085] [2021-11-07 01:00:48,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841724085] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:48,346 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:48,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 01:00:48,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859783327] [2021-11-07 01:00:48,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:00:48,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:48,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:00:48,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:00:48,348 INFO L87 Difference]: Start difference. First operand 2798 states and 4316 transitions. Second operand has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:48,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:48,771 INFO L93 Difference]: Finished difference Result 3454 states and 5289 transitions. [2021-11-07 01:00:48,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:00:48,772 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-07 01:00:48,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:48,795 INFO L225 Difference]: With dead ends: 3454 [2021-11-07 01:00:48,795 INFO L226 Difference]: Without dead ends: 3452 [2021-11-07 01:00:48,797 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:00:48,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3452 states. [2021-11-07 01:00:49,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3452 to 2804. [2021-11-07 01:00:49,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2804 states, 2803 states have (on average 1.5397788084195505) internal successors, (4316), 2803 states have internal predecessors, (4316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:49,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2804 states to 2804 states and 4316 transitions. [2021-11-07 01:00:49,098 INFO L78 Accepts]: Start accepts. Automaton has 2804 states and 4316 transitions. Word has length 58 [2021-11-07 01:00:49,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:49,099 INFO L470 AbstractCegarLoop]: Abstraction has 2804 states and 4316 transitions. [2021-11-07 01:00:49,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:49,099 INFO L276 IsEmpty]: Start isEmpty. Operand 2804 states and 4316 transitions. [2021-11-07 01:00:49,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 01:00:49,100 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:49,101 INFO L513 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:49,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-07 01:00:49,101 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:49,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:49,102 INFO L85 PathProgramCache]: Analyzing trace with hash -121591094, now seen corresponding path program 1 times [2021-11-07 01:00:49,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:49,102 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409927414] [2021-11-07 01:00:49,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:49,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:49,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:49,532 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:00:49,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:49,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409927414] [2021-11-07 01:00:49,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409927414] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:00:49,533 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932588606] [2021-11-07 01:00:49,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:49,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:00:49,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:00:49,544 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:00:49,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 01:00:49,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:49,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:00:49,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:50,824 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:00:50,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:51,319 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 01:00:51,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932588606] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 01:00:51,320 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:51,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 6] total 16 [2021-11-07 01:00:51,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775990244] [2021-11-07 01:00:51,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:00:51,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:51,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:00:51,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:00:51,323 INFO L87 Difference]: Start difference. First operand 2804 states and 4316 transitions. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 4 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:52,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:52,066 INFO L93 Difference]: Finished difference Result 8087 states and 12490 transitions. [2021-11-07 01:00:52,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:00:52,068 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 4 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-07 01:00:52,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:52,116 INFO L225 Difference]: With dead ends: 8087 [2021-11-07 01:00:52,116 INFO L226 Difference]: Without dead ends: 5324 [2021-11-07 01:00:52,123 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-07 01:00:52,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5324 states. [2021-11-07 01:00:52,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5324 to 5322. [2021-11-07 01:00:52,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5322 states, 5321 states have (on average 1.5331704566810749) internal successors, (8158), 5321 states have internal predecessors, (8158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:52,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5322 states to 5322 states and 8158 transitions. [2021-11-07 01:00:52,814 INFO L78 Accepts]: Start accepts. Automaton has 5322 states and 8158 transitions. Word has length 65 [2021-11-07 01:00:52,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:52,814 INFO L470 AbstractCegarLoop]: Abstraction has 5322 states and 8158 transitions. [2021-11-07 01:00:52,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 4 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:52,815 INFO L276 IsEmpty]: Start isEmpty. Operand 5322 states and 8158 transitions. [2021-11-07 01:00:52,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:00:52,816 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:52,816 INFO L513 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:52,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:53,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:00:53,032 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:53,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:53,033 INFO L85 PathProgramCache]: Analyzing trace with hash 902352775, now seen corresponding path program 1 times [2021-11-07 01:00:53,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:53,033 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294191954] [2021-11-07 01:00:53,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:53,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:53,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:53,142 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:00:53,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:53,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294191954] [2021-11-07 01:00:53,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294191954] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:53,143 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:53,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:00:53,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84828099] [2021-11-07 01:00:53,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:00:53,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:53,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:00:53,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:00:53,150 INFO L87 Difference]: Start difference. First operand 5322 states and 8158 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:53,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:53,835 INFO L93 Difference]: Finished difference Result 10609 states and 16278 transitions. [2021-11-07 01:00:53,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:00:53,836 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 01:00:53,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:53,863 INFO L225 Difference]: With dead ends: 10609 [2021-11-07 01:00:53,864 INFO L226 Difference]: Without dead ends: 5322 [2021-11-07 01:00:53,875 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:00:53,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5322 states. [2021-11-07 01:00:54,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5322 to 5322. [2021-11-07 01:00:54,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5322 states, 5321 states have (on average 1.4984025559105432) internal successors, (7973), 5321 states have internal predecessors, (7973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:54,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5322 states to 5322 states and 7973 transitions. [2021-11-07 01:00:54,669 INFO L78 Accepts]: Start accepts. Automaton has 5322 states and 7973 transitions. Word has length 68 [2021-11-07 01:00:54,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:54,670 INFO L470 AbstractCegarLoop]: Abstraction has 5322 states and 7973 transitions. [2021-11-07 01:00:54,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:54,671 INFO L276 IsEmpty]: Start isEmpty. Operand 5322 states and 7973 transitions. [2021-11-07 01:00:54,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:00:54,672 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:54,672 INFO L513 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:54,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-07 01:00:54,673 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:54,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:54,674 INFO L85 PathProgramCache]: Analyzing trace with hash 331936194, now seen corresponding path program 1 times [2021-11-07 01:00:54,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:54,674 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375019039] [2021-11-07 01:00:54,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:54,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:54,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:55,247 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:55,248 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:55,248 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375019039] [2021-11-07 01:00:55,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375019039] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:00:55,248 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [906435349] [2021-11-07 01:00:55,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:55,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:00:55,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:00:55,256 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:00:55,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 01:00:55,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:55,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:00:55,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:56,508 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-07 01:00:56,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:57,122 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:00:57,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [906435349] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 01:00:57,123 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:57,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [12, 6] total 18 [2021-11-07 01:00:57,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769589146] [2021-11-07 01:00:57,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:00:57,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:57,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:00:57,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-11-07 01:00:57,126 INFO L87 Difference]: Start difference. First operand 5322 states and 7973 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:58,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:58,200 INFO L93 Difference]: Finished difference Result 15464 states and 23203 transitions. [2021-11-07 01:00:58,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:00:58,201 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 01:00:58,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:58,231 INFO L225 Difference]: With dead ends: 15464 [2021-11-07 01:00:58,232 INFO L226 Difference]: Without dead ends: 10210 [2021-11-07 01:00:58,242 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-11-07 01:00:58,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10210 states. [2021-11-07 01:00:59,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10210 to 10208. [2021-11-07 01:00:59,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10208 states, 10207 states have (on average 1.491035563828745) internal successors, (15219), 10207 states have internal predecessors, (15219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:59,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10208 states to 10208 states and 15219 transitions. [2021-11-07 01:00:59,268 INFO L78 Accepts]: Start accepts. Automaton has 10208 states and 15219 transitions. Word has length 68 [2021-11-07 01:00:59,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:59,269 INFO L470 AbstractCegarLoop]: Abstraction has 10208 states and 15219 transitions. [2021-11-07 01:00:59,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 4 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:59,269 INFO L276 IsEmpty]: Start isEmpty. Operand 10208 states and 15219 transitions. [2021-11-07 01:00:59,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:00:59,271 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:59,271 INFO L513 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:59,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:59,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-07 01:00:59,484 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:59,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:59,485 INFO L85 PathProgramCache]: Analyzing trace with hash 1137176831, now seen corresponding path program 1 times [2021-11-07 01:00:59,485 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:00:59,485 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735592413] [2021-11-07 01:00:59,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:59,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:00:59,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:59,655 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-07 01:00:59,655 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:00:59,655 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735592413] [2021-11-07 01:00:59,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [735592413] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:59,656 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:59,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:00:59,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737335383] [2021-11-07 01:00:59,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:00:59,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:00:59,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:00:59,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:00:59,658 INFO L87 Difference]: Start difference. First operand 10208 states and 15219 transitions. Second operand has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:00,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:00,605 INFO L93 Difference]: Finished difference Result 20360 states and 30372 transitions. [2021-11-07 01:01:00,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:01:00,606 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-07 01:01:00,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:00,631 INFO L225 Difference]: With dead ends: 20360 [2021-11-07 01:01:00,631 INFO L226 Difference]: Without dead ends: 10208 [2021-11-07 01:01:00,644 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:01:00,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10208 states. [2021-11-07 01:01:01,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10208 to 10208. [2021-11-07 01:01:01,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10208 states, 10207 states have (on average 1.4636034094249044) internal successors, (14939), 10207 states have internal predecessors, (14939), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:01,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10208 states to 10208 states and 14939 transitions. [2021-11-07 01:01:01,512 INFO L78 Accepts]: Start accepts. Automaton has 10208 states and 14939 transitions. Word has length 71 [2021-11-07 01:01:01,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:01:01,512 INFO L470 AbstractCegarLoop]: Abstraction has 10208 states and 14939 transitions. [2021-11-07 01:01:01,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:01,512 INFO L276 IsEmpty]: Start isEmpty. Operand 10208 states and 14939 transitions. [2021-11-07 01:01:01,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:01:01,514 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:01:01,514 INFO L513 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:01:01,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-07 01:01:01,514 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:01:01,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:01:01,515 INFO L85 PathProgramCache]: Analyzing trace with hash -259779100, now seen corresponding path program 1 times [2021-11-07 01:01:01,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:01:01,515 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591637590] [2021-11-07 01:01:01,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:01,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:01:01,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:01,863 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:01,863 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:01:01,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591637590] [2021-11-07 01:01:01,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [591637590] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:01:01,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522273676] [2021-11-07 01:01:01,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:01,863 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:01:01,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:01:01,864 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:01:01,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 01:01:02,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:02,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:01:02,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:03,204 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 01:01:03,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:03,890 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 01:01:03,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522273676] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 01:01:03,891 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:01:03,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [12, 6] total 18 [2021-11-07 01:01:03,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833248229] [2021-11-07 01:01:03,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:01:03,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:01:03,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:01:03,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2021-11-07 01:01:03,895 INFO L87 Difference]: Start difference. First operand 10208 states and 14939 transitions. Second operand has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:05,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:05,850 INFO L93 Difference]: Finished difference Result 29892 states and 43773 transitions. [2021-11-07 01:01:05,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:01:05,851 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-07 01:01:05,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:05,923 INFO L225 Difference]: With dead ends: 29892 [2021-11-07 01:01:05,923 INFO L226 Difference]: Without dead ends: 19762 [2021-11-07 01:01:05,941 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-07 01:01:05,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19762 states. [2021-11-07 01:01:07,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19762 to 19760. [2021-11-07 01:01:07,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19760 states, 19759 states have (on average 1.4565008350625033) internal successors, (28779), 19759 states have internal predecessors, (28779), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:07,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19760 states to 19760 states and 28779 transitions. [2021-11-07 01:01:07,791 INFO L78 Accepts]: Start accepts. Automaton has 19760 states and 28779 transitions. Word has length 71 [2021-11-07 01:01:07,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:01:07,791 INFO L470 AbstractCegarLoop]: Abstraction has 19760 states and 28779 transitions. [2021-11-07 01:01:07,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:07,792 INFO L276 IsEmpty]: Start isEmpty. Operand 19760 states and 28779 transitions. [2021-11-07 01:01:07,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:01:07,793 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:01:07,794 INFO L513 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:01:07,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:08,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-07 01:01:08,020 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:01:08,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:01:08,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1396909514, now seen corresponding path program 1 times [2021-11-07 01:01:08,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:01:08,021 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347343972] [2021-11-07 01:01:08,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:08,021 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:01:08,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:08,372 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:01:08,372 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:01:08,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347343972] [2021-11-07 01:01:08,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347343972] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:01:08,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130693903] [2021-11-07 01:01:08,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:08,373 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:01:08,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:01:08,374 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:01:08,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 01:01:08,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:08,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-07 01:01:08,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:09,981 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 01:01:09,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:10,646 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 01:01:10,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130693903] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 01:01:10,646 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:01:10,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10, 7] total 19 [2021-11-07 01:01:10,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144147102] [2021-11-07 01:01:10,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:01:10,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:01:10,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:01:10,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2021-11-07 01:01:10,648 INFO L87 Difference]: Start difference. First operand 19760 states and 28779 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:13,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:13,579 INFO L93 Difference]: Finished difference Result 38238 states and 55333 transitions. [2021-11-07 01:01:13,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 01:01:13,581 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:01:13,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:13,654 INFO L225 Difference]: With dead ends: 38238 [2021-11-07 01:01:13,654 INFO L226 Difference]: Without dead ends: 27908 [2021-11-07 01:01:13,677 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:01:13,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27908 states. [2021-11-07 01:01:15,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27908 to 19782. [2021-11-07 01:01:15,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19782 states, 19781 states have (on average 1.4562458925231283) internal successors, (28806), 19781 states have internal predecessors, (28806), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:15,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19782 states to 19782 states and 28806 transitions. [2021-11-07 01:01:15,798 INFO L78 Accepts]: Start accepts. Automaton has 19782 states and 28806 transitions. Word has length 74 [2021-11-07 01:01:15,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:01:15,798 INFO L470 AbstractCegarLoop]: Abstraction has 19782 states and 28806 transitions. [2021-11-07 01:01:15,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:15,799 INFO L276 IsEmpty]: Start isEmpty. Operand 19782 states and 28806 transitions. [2021-11-07 01:01:15,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:01:15,800 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:01:15,800 INFO L513 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:01:15,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:16,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:01:16,012 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:01:16,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:01:16,012 INFO L85 PathProgramCache]: Analyzing trace with hash -683962328, now seen corresponding path program 1 times [2021-11-07 01:01:16,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:01:16,013 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289461316] [2021-11-07 01:01:16,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:16,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:01:16,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:16,415 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:16,415 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:01:16,416 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289461316] [2021-11-07 01:01:16,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289461316] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:01:16,416 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271632303] [2021-11-07 01:01:16,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:16,416 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:01:16,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:01:16,417 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:01:16,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-07 01:01:16,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:16,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-07 01:01:17,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:18,207 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 01:01:18,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:18,945 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 01:01:18,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1271632303] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 01:01:18,946 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:01:18,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [12, 7] total 21 [2021-11-07 01:01:18,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982747345] [2021-11-07 01:01:18,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:01:18,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:01:18,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:01:18,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-11-07 01:01:18,947 INFO L87 Difference]: Start difference. First operand 19782 states and 28806 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:23,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:23,466 INFO L93 Difference]: Finished difference Result 46804 states and 68042 transitions. [2021-11-07 01:01:23,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 01:01:23,467 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:01:23,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:23,559 INFO L225 Difference]: With dead ends: 46804 [2021-11-07 01:01:23,559 INFO L226 Difference]: Without dead ends: 36674 [2021-11-07 01:01:23,578 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:01:23,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36674 states. [2021-11-07 01:01:26,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36674 to 29360. [2021-11-07 01:01:26,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29360 states, 29359 states have (on average 1.4438843284853027) internal successors, (42391), 29359 states have internal predecessors, (42391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:26,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29360 states to 29360 states and 42391 transitions. [2021-11-07 01:01:26,961 INFO L78 Accepts]: Start accepts. Automaton has 29360 states and 42391 transitions. Word has length 74 [2021-11-07 01:01:26,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:01:26,961 INFO L470 AbstractCegarLoop]: Abstraction has 29360 states and 42391 transitions. [2021-11-07 01:01:26,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 5 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:26,962 INFO L276 IsEmpty]: Start isEmpty. Operand 29360 states and 42391 transitions. [2021-11-07 01:01:26,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:01:26,964 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:01:26,964 INFO L513 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:01:26,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:27,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:01:27,165 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:01:27,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:01:27,166 INFO L85 PathProgramCache]: Analyzing trace with hash 2140204086, now seen corresponding path program 1 times [2021-11-07 01:01:27,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:01:27,166 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451418355] [2021-11-07 01:01:27,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:27,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:01:27,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:27,503 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:01:27,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:01:27,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451418355] [2021-11-07 01:01:27,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451418355] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:01:27,504 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057762517] [2021-11-07 01:01:27,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:27,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:01:27,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:01:27,507 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:01:27,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_180b98ea-f9bc-492b-b65d-cfe791b62e1c/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-07 01:01:28,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:28,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-07 01:01:28,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:30,068 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:01:30,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:38,171 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:38,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057762517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:01:38,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986469257] [2021-11-07 01:01:38,201 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2021-11-07 01:01:38,201 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:01:38,207 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:01:38,214 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:01:38,215 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:01:38,552 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:01:38,555 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:01:38,556 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:01:38,556 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:01:38,557 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:01:38,558 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:01:38,558 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:01:38,563 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:01:38,563 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:01:38,564 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:01:38,565 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:01:38,565 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:01:38,566 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:01:38,585 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 772 [2021-11-07 01:01:38,603 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12 [2021-11-07 01:01:54,126 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 262144 conjuctions. This might take some time...