./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta --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 aa38d95315e187ea5fe9b62230d938985648af7e7d892502233db02121b7b545 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-dbf71c6-m [2022-10-17 17:43:03,900 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:43:03,903 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:43:03,952 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:43:03,955 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:43:03,962 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:43:03,965 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:43:03,970 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:43:03,973 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:43:03,983 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:43:03,984 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:43:03,988 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:43:03,988 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:43:03,992 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:43:03,994 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:43:03,998 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:43:04,001 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:43:04,002 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:43:04,006 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:43:04,018 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:43:04,021 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:43:04,022 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:43:04,027 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:43:04,029 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:43:04,035 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:43:04,036 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:43:04,036 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:43:04,039 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:43:04,040 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:43:04,041 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:43:04,042 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:43:04,043 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:43:04,046 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:43:04,048 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:43:04,049 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:43:04,050 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:43:04,051 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:43:04,051 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:43:04,052 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:43:04,053 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:43:04,054 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:43:04,055 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-10-17 17:43:04,091 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:43:04,091 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:43:04,092 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:43:04,092 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:43:04,093 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:43:04,093 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:43:04,094 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:43:04,094 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:43:04,094 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:43:04,095 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:43:04,095 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:43:04,095 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:43:04,096 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:43:04,096 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:43:04,096 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:43:04,097 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:43:04,097 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:43:04,097 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:43:04,098 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:43:04,098 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:43:04,099 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:43:04,099 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:43:04,099 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:43:04,100 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:43:04,100 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:43:04,100 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:43:04,101 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:43:04,101 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:43:04,101 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:43:04,102 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:43:04,102 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:43:04,102 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:43:04,103 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:43:04,103 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:43:04,103 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:43:04,104 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:43:04,104 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:43:04,104 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:43:04,104 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:43:04,105 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:43:04,105 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:43:04,105 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aa38d95315e187ea5fe9b62230d938985648af7e7d892502233db02121b7b545 [2022-10-17 17:43:04,546 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:43:04,598 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:43:04,601 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:43:04,603 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:43:04,604 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:43:04,606 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-1.c [2022-10-17 17:43:04,695 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/data/57beac47e/63b39b13f10444b6a1f965b9339721e5/FLAGe5864e13d [2022-10-17 17:43:06,051 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:43:06,052 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-1.c [2022-10-17 17:43:06,118 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/data/57beac47e/63b39b13f10444b6a1f965b9339721e5/FLAGe5864e13d [2022-10-17 17:43:06,599 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/data/57beac47e/63b39b13f10444b6a1f965b9339721e5 [2022-10-17 17:43:06,602 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:43:06,604 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:43:06,607 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:43:06,607 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:43:06,611 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:43:06,612 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:43:06" (1/1) ... [2022-10-17 17:43:06,614 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1639dfd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:06, skipping insertion in model container [2022-10-17 17:43:06,614 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:43:06" (1/1) ... [2022-10-17 17:43:06,624 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:43:06,912 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:43:09,715 WARN L230 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_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-1.c[378560,378573] [2022-10-17 17:43:09,752 WARN L230 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_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-1.c[383339,383352] [2022-10-17 17:43:10,101 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:43:10,114 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:43:11,628 WARN L230 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_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-1.c[378560,378573] [2022-10-17 17:43:11,637 WARN L230 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_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-1.c[383339,383352] [2022-10-17 17:43:11,683 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:43:11,785 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:43:11,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11 WrapperNode [2022-10-17 17:43:11,786 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:43:11,787 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:43:11,787 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:43:11,788 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:43:11,797 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:12,012 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:12,497 INFO L138 Inliner]: procedures = 60, calls = 65, calls flagged for inlining = 38, calls inlined = 38, statements flattened = 12967 [2022-10-17 17:43:12,498 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:43:12,499 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:43:12,500 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:43:12,500 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:43:12,513 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:12,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:12,725 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:12,726 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:13,075 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:13,171 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:13,197 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:13,229 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:13,386 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:43:13,412 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:43:13,412 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:43:13,412 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:43:13,414 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (1/1) ... [2022-10-17 17:43:13,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:43:13,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:13,465 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:43:13,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:43:13,627 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:43:13,627 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2022-10-17 17:43:13,628 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2022-10-17 17:43:13,628 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-10-17 17:43:13,628 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-10-17 17:43:13,628 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2022-10-17 17:43:13,629 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2022-10-17 17:43:13,629 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2022-10-17 17:43:13,629 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2022-10-17 17:43:13,629 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2022-10-17 17:43:13,629 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2022-10-17 17:43:13,630 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2022-10-17 17:43:13,630 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2022-10-17 17:43:13,630 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:43:13,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:43:13,631 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:43:13,909 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:43:13,912 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:43:24,633 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:43:27,976 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:43:27,976 INFO L300 CfgBuilder]: Removed 12 assume(true) statements. [2022-10-17 17:43:27,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:43:27 BoogieIcfgContainer [2022-10-17 17:43:27,985 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:43:27,990 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:43:27,990 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:43:27,994 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:43:27,994 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:43:06" (1/3) ... [2022-10-17 17:43:27,995 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bfab5d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:43:27, skipping insertion in model container [2022-10-17 17:43:27,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:43:11" (2/3) ... [2022-10-17 17:43:27,997 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bfab5d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:43:27, skipping insertion in model container [2022-10-17 17:43:27,997 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:43:27" (3/3) ... [2022-10-17 17:43:27,998 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label42+token_ring.08.cil-1.c [2022-10-17 17:43:28,028 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:43:28,029 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-10-17 17:43:28,155 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:43:28,164 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@3ef63451, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:43:28,164 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-10-17 17:43:28,178 INFO L276 IsEmpty]: Start isEmpty. Operand has 1787 states, 1756 states have (on average 1.964123006833713) internal successors, (3449), 1759 states have internal predecessors, (3449), 22 states have call successors, (22), 6 states have call predecessors, (22), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-10-17 17:43:28,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-10-17 17:43:28,193 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:28,194 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:28,195 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:28,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:28,202 INFO L85 PathProgramCache]: Analyzing trace with hash 1761736009, now seen corresponding path program 1 times [2022-10-17 17:43:28,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:28,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511848944] [2022-10-17 17:43:28,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:28,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:28,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:28,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:43:28,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:28,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511848944] [2022-10-17 17:43:28,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511848944] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:28,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:43:28,874 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:43:28,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673778902] [2022-10-17 17:43:28,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:28,884 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-10-17 17:43:28,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:28,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-10-17 17:43:28,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:43:28,943 INFO L87 Difference]: Start difference. First operand has 1787 states, 1756 states have (on average 1.964123006833713) internal successors, (3449), 1759 states have internal predecessors, (3449), 22 states have call successors, (22), 6 states have call predecessors, (22), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-10-17 17:43:30,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:30,323 INFO L93 Difference]: Finished difference Result 3701 states and 7203 transitions. [2022-10-17 17:43:30,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-10-17 17:43:30,326 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 55 [2022-10-17 17:43:30,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:30,365 INFO L225 Difference]: With dead ends: 3701 [2022-10-17 17:43:30,365 INFO L226 Difference]: Without dead ends: 1913 [2022-10-17 17:43:30,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:43:30,386 INFO L413 NwaCegarLoop]: 3391 mSDtfsCounter, 3647 mSDsluCounter, 3593 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3647 SdHoareTripleChecker+Valid, 6700 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:30,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3647 Valid, 6700 Invalid, 676 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 662 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-10-17 17:43:30,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1913 states. [2022-10-17 17:43:30,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1913 to 1912. [2022-10-17 17:43:30,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1912 states, 1858 states have (on average 1.9332615715823467) internal successors, (3592), 1861 states have internal predecessors, (3592), 40 states have call successors, (40), 12 states have call predecessors, (40), 12 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2022-10-17 17:43:30,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1912 states to 1912 states and 3672 transitions. [2022-10-17 17:43:30,612 INFO L78 Accepts]: Start accepts. Automaton has 1912 states and 3672 transitions. Word has length 55 [2022-10-17 17:43:30,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:30,613 INFO L495 AbstractCegarLoop]: Abstraction has 1912 states and 3672 transitions. [2022-10-17 17:43:30,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-10-17 17:43:30,613 INFO L276 IsEmpty]: Start isEmpty. Operand 1912 states and 3672 transitions. [2022-10-17 17:43:30,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-10-17 17:43:30,623 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:30,624 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:43:30,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:43:30,625 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:43:30,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:43:30,626 INFO L85 PathProgramCache]: Analyzing trace with hash 267161106, now seen corresponding path program 1 times [2022-10-17 17:43:30,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:43:30,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551503113] [2022-10-17 17:43:30,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:30,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:43:30,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:31,076 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-10-17 17:43:31,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:43:31,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551503113] [2022-10-17 17:43:31,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551503113] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:43:31,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574440258] [2022-10-17 17:43:31,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:43:31,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:43:31,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:43:31,087 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:43:31,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce1b9cc7-bacd-4d79-b29d-0ceeaac3c734/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:43:31,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:43:31,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 768 conjuncts, 2 conjunts are in the unsatisfiable core [2022-10-17 17:43:31,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:43:31,511 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-10-17 17:43:31,511 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:43:31,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574440258] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:43:31,512 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-10-17 17:43:31,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-10-17 17:43:31,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228570812] [2022-10-17 17:43:31,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:43:31,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:43:31,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:43:31,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:43:31,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:43:31,517 INFO L87 Difference]: Start difference. First operand 1912 states and 3672 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-10-17 17:43:32,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:43:32,141 INFO L93 Difference]: Finished difference Result 2437 states and 4475 transitions. [2022-10-17 17:43:32,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:43:32,142 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 108 [2022-10-17 17:43:32,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:43:32,167 INFO L225 Difference]: With dead ends: 2437 [2022-10-17 17:43:32,167 INFO L226 Difference]: Without dead ends: 2171 [2022-10-17 17:43:32,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:43:32,172 INFO L413 NwaCegarLoop]: 3275 mSDtfsCounter, 3447 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3447 SdHoareTripleChecker+Valid, 3440 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-10-17 17:43:32,173 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3447 Valid, 3440 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-10-17 17:43:32,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2171 states. [2022-10-17 17:43:32,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2171 to 2167. [2022-10-17 17:43:32,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2167 states, 2067 states have (on average 1.8872762457668117) internal successors, (3901), 2071 states have internal predecessors, (3901), 74 states have call successors, (74), 24 states have call predecessors, (74), 24 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2022-10-17 17:43:32,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2167 states to 2167 states and 4049 transitions. [2022-10-17 17:43:32,316 INFO L78 Accepts]: Start accepts. Automaton has 2167 states and 4049 transitions. Word has length 108 [2022-10-17 17:43:32,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:43:32,318 INFO L495 AbstractCegarLoop]: Abstraction has 2167 states and 4049 transitions. [2022-10-17 17:43:32,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-10-17 17:43:32,319 INFO L276 IsEmpty]: Start isEmpty. Operand 2167 states and 4049 transitions. [2022-10-17 17:43:32,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-10-17 17:43:32,326 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:43:32,326 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]