./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI --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 fe6bee847a7b573239a2f60b60a87297f25c539812daa07adcb7591b7977879b --- 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-5e519f3 [2022-11-03 02:12:51,157 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:12:51,159 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:12:51,199 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:12:51,200 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:12:51,204 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:12:51,207 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:12:51,211 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:12:51,213 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:12:51,218 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:12:51,219 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:12:51,222 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:12:51,222 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:12:51,225 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:12:51,226 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:12:51,228 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:12:51,230 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:12:51,231 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:12:51,232 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:12:51,241 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:12:51,243 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:12:51,244 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:12:51,247 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:12:51,248 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:12:51,254 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:12:51,257 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:12:51,257 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:12:51,259 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:12:51,260 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:12:51,261 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:12:51,262 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:12:51,263 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:12:51,265 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:12:51,266 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:12:51,268 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:12:51,268 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:12:51,269 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:12:51,269 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:12:51,269 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:12:51,270 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:12:51,271 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:12:51,272 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:12:51,308 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:12:51,312 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:12:51,313 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:12:51,313 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:12:51,314 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:12:51,314 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:12:51,314 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:12:51,314 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:12:51,315 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:12:51,315 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:12:51,316 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:12:51,316 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:12:51,316 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:12:51,316 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:12:51,317 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:12:51,317 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:12:51,317 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:12:51,317 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:12:51,318 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:12:51,318 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:12:51,318 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:12:51,319 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:12:51,319 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:12:51,319 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:12:51,319 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:12:51,319 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:12:51,320 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:12:51,320 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:12:51,320 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:12:51,321 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:12:51,321 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:12:51,322 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:12:51,322 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:12:51,322 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:12:51,322 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:12:51,322 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:12:51,323 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:12:51,323 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:12:51,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:12:51,325 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:12:51,325 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:12:51,325 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_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fe6bee847a7b573239a2f60b60a87297f25c539812daa07adcb7591b7977879b [2022-11-03 02:12:51,603 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:12:51,624 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:12:51,627 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:12:51,628 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:12:51,629 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:12:51,630 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c [2022-11-03 02:12:51,728 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/data/47a0867bc/bf4567052a63436e8676b6f1f87899d5/FLAG7f12246a7 [2022-11-03 02:12:52,376 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:12:52,377 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c [2022-11-03 02:12:52,412 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/data/47a0867bc/bf4567052a63436e8676b6f1f87899d5/FLAG7f12246a7 [2022-11-03 02:12:52,729 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/data/47a0867bc/bf4567052a63436e8676b6f1f87899d5 [2022-11-03 02:12:52,732 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:12:52,733 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:12:52,739 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:12:52,739 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:12:52,742 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:12:52,743 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:12:52" (1/1) ... [2022-11-03 02:12:52,744 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65bae4ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:52, skipping insertion in model container [2022-11-03 02:12:52,745 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:12:52" (1/1) ... [2022-11-03 02:12:52,752 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:12:52,821 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:12:53,016 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_4f04ec3c-989f-46f3-a695-78f5ed776833/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c[913,926] [2022-11-03 02:12:53,065 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_4f04ec3c-989f-46f3-a695-78f5ed776833/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c[5977,5990] [2022-11-03 02:12:53,237 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:12:53,251 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:12:53,276 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_4f04ec3c-989f-46f3-a695-78f5ed776833/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c[913,926] [2022-11-03 02:12:53,299 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_4f04ec3c-989f-46f3-a695-78f5ed776833/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.10.cil-1.c[5977,5990] [2022-11-03 02:12:53,338 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:12:53,358 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:12:53,358 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53 WrapperNode [2022-11-03 02:12:53,359 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:12:53,360 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:12:53,360 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:12:53,360 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:12:53,368 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,382 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,435 INFO L138 Inliner]: procedures = 68, calls = 79, calls flagged for inlining = 42, calls inlined = 42, statements flattened = 944 [2022-11-03 02:12:53,436 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:12:53,437 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:12:53,437 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:12:53,437 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:12:53,446 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,447 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,451 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,451 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,464 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,478 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,482 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,485 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,491 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:12:53,492 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:12:53,492 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:12:53,492 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:12:53,501 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (1/1) ... [2022-11-03 02:12:53,513 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:12:53,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:53,550 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:12:53,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:12:53,598 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:12:53,598 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-03 02:12:53,598 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-03 02:12:53,598 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2022-11-03 02:12:53,599 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2022-11-03 02:12:53,599 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-11-03 02:12:53,599 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-11-03 02:12:53,599 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-11-03 02:12:53,600 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-11-03 02:12:53,600 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-11-03 02:12:53,600 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-11-03 02:12:53,600 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-11-03 02:12:53,600 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-11-03 02:12:53,601 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-11-03 02:12:53,601 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-11-03 02:12:53,601 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:12:53,601 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-11-03 02:12:53,602 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-11-03 02:12:53,602 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:12:53,602 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:12:53,602 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-11-03 02:12:53,602 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-11-03 02:12:53,603 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-11-03 02:12:53,603 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-11-03 02:12:53,735 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:12:53,737 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:12:54,656 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:12:55,235 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:12:55,237 INFO L300 CfgBuilder]: Removed 17 assume(true) statements. [2022-11-03 02:12:55,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:12:55 BoogieIcfgContainer [2022-11-03 02:12:55,241 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:12:55,243 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:12:55,244 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:12:55,247 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:12:55,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:12:52" (1/3) ... [2022-11-03 02:12:55,248 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8d40fd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:12:55, skipping insertion in model container [2022-11-03 02:12:55,248 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:12:53" (2/3) ... [2022-11-03 02:12:55,267 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8d40fd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:12:55, skipping insertion in model container [2022-11-03 02:12:55,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:12:55" (3/3) ... [2022-11-03 02:12:55,268 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.10.cil-1.c [2022-11-03 02:12:55,287 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:12:55,288 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-03 02:12:55,369 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:12:55,392 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;@4744d10a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:12:55,400 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-03 02:12:55,408 INFO L276 IsEmpty]: Start isEmpty. Operand has 223 states, 178 states have (on average 1.5674157303370786) internal successors, (279), 185 states have internal predecessors, (279), 32 states have call successors, (32), 10 states have call predecessors, (32), 10 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2022-11-03 02:12:55,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-03 02:12:55,421 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:55,422 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] [2022-11-03 02:12:55,423 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:55,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:55,431 INFO L85 PathProgramCache]: Analyzing trace with hash 834158309, now seen corresponding path program 1 times [2022-11-03 02:12:55,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:55,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444866843] [2022-11-03 02:12:55,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:55,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:55,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:55,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:12:55,757 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:55,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444866843] [2022-11-03 02:12:55,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444866843] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:12:55,759 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:12:55,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:12:55,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448180372] [2022-11-03 02:12:55,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:12:55,766 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:12:55,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:55,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:12:55,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:12:55,807 INFO L87 Difference]: Start difference. First operand has 223 states, 178 states have (on average 1.5674157303370786) internal successors, (279), 185 states have internal predecessors, (279), 32 states have call successors, (32), 10 states have call predecessors, (32), 10 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 02:12:56,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:56,102 INFO L93 Difference]: Finished difference Result 478 states and 734 transitions. [2022-11-03 02:12:56,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:12:56,104 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-11-03 02:12:56,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:56,122 INFO L225 Difference]: With dead ends: 478 [2022-11-03 02:12:56,122 INFO L226 Difference]: Without dead ends: 255 [2022-11-03 02:12:56,131 INFO L412 NwaCegarLoop]: 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 [2022-11-03 02:12:56,135 INFO L413 NwaCegarLoop]: 290 mSDtfsCounter, 308 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:56,138 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [308 Valid, 345 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:12:56,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2022-11-03 02:12:56,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 251. [2022-11-03 02:12:56,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 204 states have (on average 1.5) internal successors, (306), 208 states have internal predecessors, (306), 35 states have call successors, (35), 12 states have call predecessors, (35), 10 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2022-11-03 02:12:56,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 372 transitions. [2022-11-03 02:12:56,230 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 372 transitions. Word has length 28 [2022-11-03 02:12:56,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:56,230 INFO L495 AbstractCegarLoop]: Abstraction has 251 states and 372 transitions. [2022-11-03 02:12:56,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 02:12:56,231 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 372 transitions. [2022-11-03 02:12:56,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 02:12:56,234 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:56,235 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] [2022-11-03 02:12:56,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 02:12:56,235 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:56,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:56,236 INFO L85 PathProgramCache]: Analyzing trace with hash 127187284, now seen corresponding path program 1 times [2022-11-03 02:12:56,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:56,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645929130] [2022-11-03 02:12:56,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:56,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:56,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:56,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:12:56,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:56,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645929130] [2022-11-03 02:12:56,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645929130] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:12:56,358 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:12:56,358 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:12:56,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906834067] [2022-11-03 02:12:56,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:12:56,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:12:56,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:56,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:12:56,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:12:56,368 INFO L87 Difference]: Start difference. First operand 251 states and 372 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 02:12:56,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:56,502 INFO L93 Difference]: Finished difference Result 407 states and 589 transitions. [2022-11-03 02:12:56,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:12:56,503 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2022-11-03 02:12:56,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:56,510 INFO L225 Difference]: With dead ends: 407 [2022-11-03 02:12:56,510 INFO L226 Difference]: Without dead ends: 326 [2022-11-03 02:12:56,512 INFO L412 NwaCegarLoop]: 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 [2022-11-03 02:12:56,514 INFO L413 NwaCegarLoop]: 277 mSDtfsCounter, 306 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:56,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [306 Valid, 330 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:12:56,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2022-11-03 02:12:56,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 322. [2022-11-03 02:12:56,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 264 states have (on average 1.4659090909090908) internal successors, (387), 268 states have internal predecessors, (387), 42 states have call successors, (42), 16 states have call predecessors, (42), 14 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2022-11-03 02:12:56,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 467 transitions. [2022-11-03 02:12:56,578 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 467 transitions. Word has length 29 [2022-11-03 02:12:56,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:56,579 INFO L495 AbstractCegarLoop]: Abstraction has 322 states and 467 transitions. [2022-11-03 02:12:56,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 02:12:56,579 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 467 transitions. [2022-11-03 02:12:56,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-03 02:12:56,586 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:56,586 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] [2022-11-03 02:12:56,586 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 02:12:56,587 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:56,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:56,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1265449433, now seen corresponding path program 1 times [2022-11-03 02:12:56,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:56,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659082252] [2022-11-03 02:12:56,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:56,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:56,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:56,668 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:12:56,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:56,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659082252] [2022-11-03 02:12:56,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659082252] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:12:56,670 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:12:56,670 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:12:56,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172050757] [2022-11-03 02:12:56,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:12:56,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:12:56,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:56,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:12:56,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:12:56,673 INFO L87 Difference]: Start difference. First operand 322 states and 467 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 02:12:56,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:56,855 INFO L93 Difference]: Finished difference Result 562 states and 795 transitions. [2022-11-03 02:12:56,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:12:56,856 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2022-11-03 02:12:56,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:56,859 INFO L225 Difference]: With dead ends: 562 [2022-11-03 02:12:56,859 INFO L226 Difference]: Without dead ends: 410 [2022-11-03 02:12:56,862 INFO L412 NwaCegarLoop]: 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 [2022-11-03 02:12:56,867 INFO L413 NwaCegarLoop]: 287 mSDtfsCounter, 46 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 545 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:56,869 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 545 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:12:56,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2022-11-03 02:12:56,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 396. [2022-11-03 02:12:56,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 327 states have (on average 1.4434250764525993) internal successors, (472), 333 states have internal predecessors, (472), 48 states have call successors, (48), 21 states have call predecessors, (48), 19 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2022-11-03 02:12:56,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 564 transitions. [2022-11-03 02:12:56,907 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 564 transitions. Word has length 30 [2022-11-03 02:12:56,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:56,908 INFO L495 AbstractCegarLoop]: Abstraction has 396 states and 564 transitions. [2022-11-03 02:12:56,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 02:12:56,908 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 564 transitions. [2022-11-03 02:12:56,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-03 02:12:56,913 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:56,915 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-11-03 02:12:56,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-03 02:12:56,916 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:56,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:56,917 INFO L85 PathProgramCache]: Analyzing trace with hash -1566600661, now seen corresponding path program 1 times [2022-11-03 02:12:56,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:56,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808754261] [2022-11-03 02:12:56,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:56,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:56,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:57,047 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:12:57,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:57,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808754261] [2022-11-03 02:12:57,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808754261] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:12:57,048 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:12:57,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:12:57,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105802578] [2022-11-03 02:12:57,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:12:57,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:12:57,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:57,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:12:57,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:12:57,050 INFO L87 Difference]: Start difference. First operand 396 states and 564 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:12:57,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:57,198 INFO L93 Difference]: Finished difference Result 559 states and 782 transitions. [2022-11-03 02:12:57,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:12:57,199 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2022-11-03 02:12:57,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:57,205 INFO L225 Difference]: With dead ends: 559 [2022-11-03 02:12:57,205 INFO L226 Difference]: Without dead ends: 401 [2022-11-03 02:12:57,206 INFO L412 NwaCegarLoop]: 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 [2022-11-03 02:12:57,212 INFO L413 NwaCegarLoop]: 306 mSDtfsCounter, 32 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 577 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:57,213 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 577 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:12:57,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2022-11-03 02:12:57,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 390. [2022-11-03 02:12:57,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 321 states have (on average 1.426791277258567) internal successors, (458), 327 states have internal predecessors, (458), 48 states have call successors, (48), 21 states have call predecessors, (48), 19 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2022-11-03 02:12:57,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 550 transitions. [2022-11-03 02:12:57,244 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 550 transitions. Word has length 43 [2022-11-03 02:12:57,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:57,245 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 550 transitions. [2022-11-03 02:12:57,245 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:12:57,245 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 550 transitions. [2022-11-03 02:12:57,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-03 02:12:57,276 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:57,276 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-11-03 02:12:57,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-03 02:12:57,277 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:57,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:57,277 INFO L85 PathProgramCache]: Analyzing trace with hash 939665855, now seen corresponding path program 1 times [2022-11-03 02:12:57,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:57,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921336546] [2022-11-03 02:12:57,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:57,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:57,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:57,358 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 02:12:57,361 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:57,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921336546] [2022-11-03 02:12:57,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921336546] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:12:57,362 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:12:57,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:12:57,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267023651] [2022-11-03 02:12:57,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:12:57,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:12:57,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:57,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:12:57,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:12:57,366 INFO L87 Difference]: Start difference. First operand 390 states and 550 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 02:12:57,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:57,506 INFO L93 Difference]: Finished difference Result 639 states and 874 transitions. [2022-11-03 02:12:57,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:12:57,507 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2022-11-03 02:12:57,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:57,511 INFO L225 Difference]: With dead ends: 639 [2022-11-03 02:12:57,511 INFO L226 Difference]: Without dead ends: 436 [2022-11-03 02:12:57,512 INFO L412 NwaCegarLoop]: 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 [2022-11-03 02:12:57,515 INFO L413 NwaCegarLoop]: 276 mSDtfsCounter, 292 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:57,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [292 Valid, 328 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:12:57,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2022-11-03 02:12:57,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 436. [2022-11-03 02:12:57,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 436 states, 360 states have (on average 1.3916666666666666) internal successors, (501), 366 states have internal predecessors, (501), 52 states have call successors, (52), 24 states have call predecessors, (52), 22 states have return successors, (48), 46 states have call predecessors, (48), 48 states have call successors, (48) [2022-11-03 02:12:57,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 601 transitions. [2022-11-03 02:12:57,554 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 601 transitions. Word has length 46 [2022-11-03 02:12:57,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:57,555 INFO L495 AbstractCegarLoop]: Abstraction has 436 states and 601 transitions. [2022-11-03 02:12:57,555 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 02:12:57,555 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 601 transitions. [2022-11-03 02:12:57,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-03 02:12:57,557 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:57,557 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:57,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-03 02:12:57,557 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:57,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:57,558 INFO L85 PathProgramCache]: Analyzing trace with hash -374376532, now seen corresponding path program 1 times [2022-11-03 02:12:57,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:57,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92061782] [2022-11-03 02:12:57,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:57,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:57,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:57,705 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 02:12:57,705 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:57,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92061782] [2022-11-03 02:12:57,705 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92061782] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:12:57,705 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:12:57,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:12:57,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040536593] [2022-11-03 02:12:57,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:12:57,706 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:12:57,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:12:57,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:12:57,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:12:57,707 INFO L87 Difference]: Start difference. First operand 436 states and 601 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:12:58,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:12:58,015 INFO L93 Difference]: Finished difference Result 476 states and 648 transitions. [2022-11-03 02:12:58,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:12:58,016 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2022-11-03 02:12:58,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:12:58,019 INFO L225 Difference]: With dead ends: 476 [2022-11-03 02:12:58,019 INFO L226 Difference]: Without dead ends: 473 [2022-11-03 02:12:58,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:12:58,021 INFO L413 NwaCegarLoop]: 285 mSDtfsCounter, 532 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 532 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:12:58,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [532 Valid, 326 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:12:58,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2022-11-03 02:12:58,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 435. [2022-11-03 02:12:58,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 360 states have (on average 1.386111111111111) internal successors, (499), 365 states have internal predecessors, (499), 51 states have call successors, (51), 24 states have call predecessors, (51), 22 states have return successors, (48), 46 states have call predecessors, (48), 48 states have call successors, (48) [2022-11-03 02:12:58,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 598 transitions. [2022-11-03 02:12:58,069 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 598 transitions. Word has length 47 [2022-11-03 02:12:58,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:12:58,070 INFO L495 AbstractCegarLoop]: Abstraction has 435 states and 598 transitions. [2022-11-03 02:12:58,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:12:58,070 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 598 transitions. [2022-11-03 02:12:58,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-03 02:12:58,071 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:12:58,072 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:12:58,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-03 02:12:58,072 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:12:58,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:12:58,073 INFO L85 PathProgramCache]: Analyzing trace with hash 1277955234, now seen corresponding path program 1 times [2022-11-03 02:12:58,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:12:58,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905236955] [2022-11-03 02:12:58,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:58,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:12:58,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:58,323 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 02:12:58,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:12:58,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905236955] [2022-11-03 02:12:58,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905236955] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:12:58,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156367096] [2022-11-03 02:12:58,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:12:58,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:12:58,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:12:58,327 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:12:58,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:12:58,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:12:58,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:12:58,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:12:58,848 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:12:58,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:12:58,998 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-03 02:12:58,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156367096] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:12:58,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1656832443] [2022-11-03 02:12:59,019 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2022-11-03 02:12:59,020 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:12:59,024 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:12:59,031 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:12:59,031 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:13:04,504 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 165 for LOIs [2022-11-03 02:13:04,525 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 180 for LOIs [2022-11-03 02:13:04,565 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 376 for LOIs [2022-11-03 02:13:07,232 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:13:32,184 WARN L234 SmtUtils]: Spent 6.92s on a formula simplification. DAG size of input: 383 DAG size of output: 296 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:13:45,873 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8198#(and (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~t10_i~0 0) (= ~t7_i~0 0) (= ~t1_pc~0 0) (= 0 ~t8_pc~0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (= ~E_7~0 2) (= ~E_8~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~m_st~0 0) (= ~E_5~0 2) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~E_10~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~T9_E~0 2) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= 0 ~t6_st~0) (= ~t9_i~0 0) (= ~t2_i~0 0) (= 0 ~t8_st~0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~t1_st~0 0) (= ~c_num_read~0 1) (= ~T7_E~0 2) (<= ~p_num_write~0 1) (= ~m_i~0 0) (= ~t10_st~0 0) (= ~t10_pc~0 0) (= 0 ~t9_pc~0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= 0 (+ ~q_buf_0~0 2147483648)) (= ~p_dw_pc~0 1) (= ~q_write_ev~0 2) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~t8_i~0 0) (= ~token~0 0) (= ~q_read_ev~0 2) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= 0 ~t9_st~0) (= ~T10_E~0 2) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (<= ~p_last_write~0 2147483647) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= 0 ~t4_pc~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~T8_E~0 2) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~E_9~0 2) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2022-11-03 02:13:45,874 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:13:45,874 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:13:45,874 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2022-11-03 02:13:45,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611257928] [2022-11-03 02:13:45,874 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:13:45,875 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 02:13:45,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:45,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 02:13:45,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 02:13:45,877 INFO L87 Difference]: Start difference. First operand 435 states and 598 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-03 02:13:46,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:46,446 INFO L93 Difference]: Finished difference Result 878 states and 1166 transitions. [2022-11-03 02:13:46,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 02:13:46,447 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2022-11-03 02:13:46,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:46,451 INFO L225 Difference]: With dead ends: 878 [2022-11-03 02:13:46,451 INFO L226 Difference]: Without dead ends: 875 [2022-11-03 02:13:46,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 38.6s TimeCoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 02:13:46,453 INFO L413 NwaCegarLoop]: 339 mSDtfsCounter, 670 mSDsluCounter, 988 mSDsCounter, 0 mSdLazyCounter, 466 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 670 SdHoareTripleChecker+Valid, 1157 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:46,454 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [670 Valid, 1157 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 466 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:13:46,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 875 states. [2022-11-03 02:13:46,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 875 to 644. [2022-11-03 02:13:46,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 644 states, 537 states have (on average 1.3631284916201116) internal successors, (732), 544 states have internal predecessors, (732), 70 states have call successors, (70), 37 states have call predecessors, (70), 35 states have return successors, (67), 63 states have call predecessors, (67), 67 states have call successors, (67) [2022-11-03 02:13:46,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 869 transitions. [2022-11-03 02:13:46,512 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 869 transitions. Word has length 48 [2022-11-03 02:13:46,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:13:46,513 INFO L495 AbstractCegarLoop]: Abstraction has 644 states and 869 transitions. [2022-11-03 02:13:46,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-03 02:13:46,513 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 869 transitions. [2022-11-03 02:13:46,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-03 02:13:46,515 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:13:46,515 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, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:13:46,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 02:13:46,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:13:46,729 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:13:46,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:13:46,730 INFO L85 PathProgramCache]: Analyzing trace with hash 1679963784, now seen corresponding path program 1 times [2022-11-03 02:13:46,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:13:46,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701339704] [2022-11-03 02:13:46,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:46,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:13:46,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:46,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:13:46,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:13:46,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701339704] [2022-11-03 02:13:46,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701339704] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:13:46,832 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:13:46,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:13:46,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958242766] [2022-11-03 02:13:46,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:13:46,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:13:46,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:46,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:13:46,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:13:46,833 INFO L87 Difference]: Start difference. First operand 644 states and 869 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 02:13:47,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:47,243 INFO L93 Difference]: Finished difference Result 960 states and 1380 transitions. [2022-11-03 02:13:47,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:13:47,245 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), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 62 [2022-11-03 02:13:47,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:47,255 INFO L225 Difference]: With dead ends: 960 [2022-11-03 02:13:47,255 INFO L226 Difference]: Without dead ends: 796 [2022-11-03 02:13:47,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:13:47,258 INFO L413 NwaCegarLoop]: 456 mSDtfsCounter, 510 mSDsluCounter, 443 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 510 SdHoareTripleChecker+Valid, 811 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:47,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [510 Valid, 811 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:13:47,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 796 states. [2022-11-03 02:13:47,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 796 to 795. [2022-11-03 02:13:47,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 795 states, 662 states have (on average 1.3867069486404835) internal successors, (918), 670 states have internal predecessors, (918), 90 states have call successors, (90), 43 states have call predecessors, (90), 41 states have return successors, (87), 82 states have call predecessors, (87), 87 states have call successors, (87) [2022-11-03 02:13:47,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 795 states to 795 states and 1095 transitions. [2022-11-03 02:13:47,344 INFO L78 Accepts]: Start accepts. Automaton has 795 states and 1095 transitions. Word has length 62 [2022-11-03 02:13:47,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:13:47,344 INFO L495 AbstractCegarLoop]: Abstraction has 795 states and 1095 transitions. [2022-11-03 02:13:47,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 02:13:47,345 INFO L276 IsEmpty]: Start isEmpty. Operand 795 states and 1095 transitions. [2022-11-03 02:13:47,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-03 02:13:47,346 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:13:47,347 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:13:47,347 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-03 02:13:47,347 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:13:47,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:13:47,347 INFO L85 PathProgramCache]: Analyzing trace with hash 271138942, now seen corresponding path program 2 times [2022-11-03 02:13:47,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:13:47,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081617961] [2022-11-03 02:13:47,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:47,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:13:47,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:47,385 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 02:13:47,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:13:47,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081617961] [2022-11-03 02:13:47,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081617961] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:13:47,386 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:13:47,386 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:13:47,386 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730913353] [2022-11-03 02:13:47,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:13:47,386 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:13:47,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:47,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:13:47,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:13:47,387 INFO L87 Difference]: Start difference. First operand 795 states and 1095 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 02:13:47,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:47,523 INFO L93 Difference]: Finished difference Result 1125 states and 1528 transitions. [2022-11-03 02:13:47,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:13:47,525 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 61 [2022-11-03 02:13:47,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:47,529 INFO L225 Difference]: With dead ends: 1125 [2022-11-03 02:13:47,529 INFO L226 Difference]: Without dead ends: 737 [2022-11-03 02:13:47,530 INFO L412 NwaCegarLoop]: 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 [2022-11-03 02:13:47,530 INFO L413 NwaCegarLoop]: 295 mSDtfsCounter, 304 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:47,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [304 Valid, 340 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:13:47,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 737 states. [2022-11-03 02:13:47,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 737 to 728. [2022-11-03 02:13:47,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 728 states, 605 states have (on average 1.3834710743801653) internal successors, (837), 614 states have internal predecessors, (837), 84 states have call successors, (84), 39 states have call predecessors, (84), 37 states have return successors, (81), 75 states have call predecessors, (81), 81 states have call successors, (81) [2022-11-03 02:13:47,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 728 states to 728 states and 1002 transitions. [2022-11-03 02:13:47,588 INFO L78 Accepts]: Start accepts. Automaton has 728 states and 1002 transitions. Word has length 61 [2022-11-03 02:13:47,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:13:47,589 INFO L495 AbstractCegarLoop]: Abstraction has 728 states and 1002 transitions. [2022-11-03 02:13:47,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 02:13:47,589 INFO L276 IsEmpty]: Start isEmpty. Operand 728 states and 1002 transitions. [2022-11-03 02:13:47,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-03 02:13:47,591 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:13:47,591 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2022-11-03 02:13:47,591 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-03 02:13:47,591 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:13:47,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:13:47,592 INFO L85 PathProgramCache]: Analyzing trace with hash 272645476, now seen corresponding path program 1 times [2022-11-03 02:13:47,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:13:47,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058462873] [2022-11-03 02:13:47,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:47,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:13:47,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:47,739 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:13:47,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:13:47,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058462873] [2022-11-03 02:13:47,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058462873] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:13:47,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408638644] [2022-11-03 02:13:47,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:47,740 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:13:47,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:13:47,741 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:13:47,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:13:47,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:47,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:13:47,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:13:47,930 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 02:13:47,930 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:13:47,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408638644] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:13:47,931 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:13:47,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-03 02:13:47,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201203100] [2022-11-03 02:13:47,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:13:47,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:13:47,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:47,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:13:47,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:47,932 INFO L87 Difference]: Start difference. First operand 728 states and 1002 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-03 02:13:48,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:48,169 INFO L93 Difference]: Finished difference Result 855 states and 1161 transitions. [2022-11-03 02:13:48,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:13:48,170 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 73 [2022-11-03 02:13:48,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:48,173 INFO L225 Difference]: With dead ends: 855 [2022-11-03 02:13:48,173 INFO L226 Difference]: Without dead ends: 321 [2022-11-03 02:13:48,174 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:48,175 INFO L413 NwaCegarLoop]: 287 mSDtfsCounter, 25 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:48,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 546 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:13:48,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2022-11-03 02:13:48,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 321. [2022-11-03 02:13:48,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 262 states have (on average 1.5076335877862594) internal successors, (395), 265 states have internal predecessors, (395), 46 states have call successors, (46), 13 states have call predecessors, (46), 12 states have return successors, (44), 43 states have call predecessors, (44), 44 states have call successors, (44) [2022-11-03 02:13:48,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 485 transitions. [2022-11-03 02:13:48,204 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 485 transitions. Word has length 73 [2022-11-03 02:13:48,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:13:48,204 INFO L495 AbstractCegarLoop]: Abstraction has 321 states and 485 transitions. [2022-11-03 02:13:48,204 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-03 02:13:48,204 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 485 transitions. [2022-11-03 02:13:48,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 02:13:48,206 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:13:48,206 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, 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, 1, 1, 1] [2022-11-03 02:13:48,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:13:48,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 02:13:48,422 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:13:48,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:13:48,422 INFO L85 PathProgramCache]: Analyzing trace with hash 564258525, now seen corresponding path program 1 times [2022-11-03 02:13:48,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:13:48,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900489769] [2022-11-03 02:13:48,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:48,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:13:48,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:48,667 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:13:48,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:13:48,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900489769] [2022-11-03 02:13:48,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1900489769] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:13:48,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925984605] [2022-11-03 02:13:48,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:48,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:13:48,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:13:48,669 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:13:48,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:13:48,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:48,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 915 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:13:48,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:13:48,993 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-03 02:13:48,993 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:13:48,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925984605] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:13:48,994 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:13:48,994 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 02:13:48,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560593200] [2022-11-03 02:13:48,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:13:48,995 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:13:48,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:48,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:13:48,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:48,996 INFO L87 Difference]: Start difference. First operand 321 states and 485 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:49,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:49,197 INFO L93 Difference]: Finished difference Result 944 states and 1452 transitions. [2022-11-03 02:13:49,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:13:49,198 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 123 [2022-11-03 02:13:49,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:49,203 INFO L225 Difference]: With dead ends: 944 [2022-11-03 02:13:49,204 INFO L226 Difference]: Without dead ends: 629 [2022-11-03 02:13:49,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:49,206 INFO L413 NwaCegarLoop]: 268 mSDtfsCounter, 224 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 470 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:49,206 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 470 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:13:49,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2022-11-03 02:13:49,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 623. [2022-11-03 02:13:49,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 623 states, 514 states have (on average 1.5058365758754864) internal successors, (774), 518 states have internal predecessors, (774), 84 states have call successors, (84), 25 states have call predecessors, (84), 24 states have return successors, (82), 80 states have call predecessors, (82), 82 states have call successors, (82) [2022-11-03 02:13:49,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 623 states to 623 states and 940 transitions. [2022-11-03 02:13:49,260 INFO L78 Accepts]: Start accepts. Automaton has 623 states and 940 transitions. Word has length 123 [2022-11-03 02:13:49,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:13:49,260 INFO L495 AbstractCegarLoop]: Abstraction has 623 states and 940 transitions. [2022-11-03 02:13:49,261 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 2 states have internal predecessors, (83), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:49,261 INFO L276 IsEmpty]: Start isEmpty. Operand 623 states and 940 transitions. [2022-11-03 02:13:49,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 02:13:49,265 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:13:49,265 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, 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, 1, 1, 1] [2022-11-03 02:13:49,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:13:49,484 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:13:49,485 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:13:49,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:13:49,485 INFO L85 PathProgramCache]: Analyzing trace with hash 1689809021, now seen corresponding path program 1 times [2022-11-03 02:13:49,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:13:49,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674582976] [2022-11-03 02:13:49,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:49,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:13:49,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:49,668 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:13:49,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:13:49,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674582976] [2022-11-03 02:13:49,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674582976] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:13:49,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647313914] [2022-11-03 02:13:49,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:49,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:13:49,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:13:49,670 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:13:49,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:13:49,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:49,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 909 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:13:49,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:13:49,974 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 02:13:49,974 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:13:49,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647313914] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:13:49,975 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:13:49,975 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 02:13:49,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753006624] [2022-11-03 02:13:49,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:13:49,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:13:49,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:49,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:13:49,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:49,976 INFO L87 Difference]: Start difference. First operand 623 states and 940 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:50,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:50,312 INFO L93 Difference]: Finished difference Result 1844 states and 2831 transitions. [2022-11-03 02:13:50,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:13:50,313 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 123 [2022-11-03 02:13:50,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:50,320 INFO L225 Difference]: With dead ends: 1844 [2022-11-03 02:13:50,320 INFO L226 Difference]: Without dead ends: 1227 [2022-11-03 02:13:50,324 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:50,324 INFO L413 NwaCegarLoop]: 267 mSDtfsCounter, 233 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:50,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 469 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:13:50,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1227 states. [2022-11-03 02:13:50,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1227 to 1219. [2022-11-03 02:13:50,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1219 states, 1012 states have (on average 1.5019762845849802) internal successors, (1520), 1018 states have internal predecessors, (1520), 158 states have call successors, (158), 49 states have call predecessors, (158), 48 states have return successors, (156), 152 states have call predecessors, (156), 156 states have call successors, (156) [2022-11-03 02:13:50,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1219 states to 1219 states and 1834 transitions. [2022-11-03 02:13:50,461 INFO L78 Accepts]: Start accepts. Automaton has 1219 states and 1834 transitions. Word has length 123 [2022-11-03 02:13:50,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:13:50,461 INFO L495 AbstractCegarLoop]: Abstraction has 1219 states and 1834 transitions. [2022-11-03 02:13:50,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 2 states have internal predecessors, (74), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:50,462 INFO L276 IsEmpty]: Start isEmpty. Operand 1219 states and 1834 transitions. [2022-11-03 02:13:50,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 02:13:50,469 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:13:50,469 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, 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, 1, 1, 1] [2022-11-03 02:13:50,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:13:50,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-03 02:13:50,685 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:13:50,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:13:50,686 INFO L85 PathProgramCache]: Analyzing trace with hash 903002845, now seen corresponding path program 1 times [2022-11-03 02:13:50,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:13:50,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352104376] [2022-11-03 02:13:50,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:50,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:13:50,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:50,852 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:13:50,853 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:13:50,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352104376] [2022-11-03 02:13:50,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352104376] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:13:50,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34833504] [2022-11-03 02:13:50,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:50,854 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:13:50,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:13:50,855 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:13:50,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:13:51,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:51,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 903 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:13:51,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:13:51,176 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-03 02:13:51,177 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:13:51,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34833504] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:13:51,177 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:13:51,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 02:13:51,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279112615] [2022-11-03 02:13:51,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:13:51,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:13:51,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:51,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:13:51,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:51,179 INFO L87 Difference]: Start difference. First operand 1219 states and 1834 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:51,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:51,521 INFO L93 Difference]: Finished difference Result 3620 states and 5539 transitions. [2022-11-03 02:13:51,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:13:51,522 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 123 [2022-11-03 02:13:51,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:51,535 INFO L225 Difference]: With dead ends: 3620 [2022-11-03 02:13:51,535 INFO L226 Difference]: Without dead ends: 2407 [2022-11-03 02:13:51,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:51,542 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 218 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:51,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 432 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:13:51,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2407 states. [2022-11-03 02:13:51,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2407 to 2395. [2022-11-03 02:13:51,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2395 states, 1996 states have (on average 1.496993987975952) internal successors, (2988), 2006 states have internal predecessors, (2988), 302 states have call successors, (302), 97 states have call predecessors, (302), 96 states have return successors, (300), 292 states have call predecessors, (300), 300 states have call successors, (300) [2022-11-03 02:13:51,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2395 states to 2395 states and 3590 transitions. [2022-11-03 02:13:51,762 INFO L78 Accepts]: Start accepts. Automaton has 2395 states and 3590 transitions. Word has length 123 [2022-11-03 02:13:51,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:13:51,763 INFO L495 AbstractCegarLoop]: Abstraction has 2395 states and 3590 transitions. [2022-11-03 02:13:51,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:51,763 INFO L276 IsEmpty]: Start isEmpty. Operand 2395 states and 3590 transitions. [2022-11-03 02:13:51,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 02:13:51,769 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:13:51,769 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, 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, 1, 1, 1] [2022-11-03 02:13:51,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:13:51,993 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 02:13:51,993 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:13:51,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:13:51,994 INFO L85 PathProgramCache]: Analyzing trace with hash 142146685, now seen corresponding path program 1 times [2022-11-03 02:13:51,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:13:51,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603160251] [2022-11-03 02:13:51,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:51,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:13:52,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:52,152 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:13:52,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:13:52,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603160251] [2022-11-03 02:13:52,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603160251] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:13:52,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092713989] [2022-11-03 02:13:52,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:52,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:13:52,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:13:52,155 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:13:52,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:13:52,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:52,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 897 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:13:52,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:13:52,476 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-03 02:13:52,476 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:13:52,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092713989] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:13:52,477 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:13:52,477 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 02:13:52,477 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809677193] [2022-11-03 02:13:52,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:13:52,478 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:13:52,478 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:52,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:13:52,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:52,479 INFO L87 Difference]: Start difference. First operand 2395 states and 3590 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 2 states have internal predecessors, (80), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:52,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:52,965 INFO L93 Difference]: Finished difference Result 7124 states and 10855 transitions. [2022-11-03 02:13:52,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:13:52,966 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 2 states have internal predecessors, (80), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 123 [2022-11-03 02:13:52,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:52,996 INFO L225 Difference]: With dead ends: 7124 [2022-11-03 02:13:52,996 INFO L226 Difference]: Without dead ends: 4735 [2022-11-03 02:13:53,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:53,007 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 227 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:53,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 432 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:13:53,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4735 states. [2022-11-03 02:13:53,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4735 to 4715. [2022-11-03 02:13:53,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4715 states, 3940 states have (on average 1.4913705583756345) internal successors, (5876), 3958 states have internal predecessors, (5876), 582 states have call successors, (582), 193 states have call predecessors, (582), 192 states have return successors, (580), 564 states have call predecessors, (580), 580 states have call successors, (580) [2022-11-03 02:13:53,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4715 states to 4715 states and 7038 transitions. [2022-11-03 02:13:53,452 INFO L78 Accepts]: Start accepts. Automaton has 4715 states and 7038 transitions. Word has length 123 [2022-11-03 02:13:53,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:13:53,454 INFO L495 AbstractCegarLoop]: Abstraction has 4715 states and 7038 transitions. [2022-11-03 02:13:53,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 2 states have internal predecessors, (80), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:53,454 INFO L276 IsEmpty]: Start isEmpty. Operand 4715 states and 7038 transitions. [2022-11-03 02:13:53,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 02:13:53,464 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:13:53,465 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, 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, 1, 1, 1] [2022-11-03 02:13:53,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:13:53,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:13:53,689 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:13:53,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:13:53,690 INFO L85 PathProgramCache]: Analyzing trace with hash 607293149, now seen corresponding path program 1 times [2022-11-03 02:13:53,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:13:53,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604311340] [2022-11-03 02:13:53,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:53,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:13:53,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:53,866 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:13:53,867 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:13:53,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604311340] [2022-11-03 02:13:53,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604311340] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:13:53,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691800273] [2022-11-03 02:13:53,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:53,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:13:53,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:13:53,869 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:13:53,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:13:54,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:54,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 891 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:13:54,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:13:54,162 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:13:54,163 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:13:54,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691800273] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:13:54,163 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:13:54,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 02:13:54,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089496504] [2022-11-03 02:13:54,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:13:54,164 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:13:54,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:54,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:13:54,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:54,165 INFO L87 Difference]: Start difference. First operand 4715 states and 7038 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:54,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:54,916 INFO L93 Difference]: Finished difference Result 14036 states and 21287 transitions. [2022-11-03 02:13:54,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:13:54,917 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 123 [2022-11-03 02:13:54,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:54,962 INFO L225 Difference]: With dead ends: 14036 [2022-11-03 02:13:54,962 INFO L226 Difference]: Without dead ends: 9327 [2022-11-03 02:13:54,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:54,978 INFO L413 NwaCegarLoop]: 230 mSDtfsCounter, 212 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:54,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 432 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:13:54,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9327 states. [2022-11-03 02:13:55,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9327 to 9291. [2022-11-03 02:13:55,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9291 states, 7780 states have (on average 1.4853470437017995) internal successors, (11556), 7814 states have internal predecessors, (11556), 1126 states have call successors, (1126), 385 states have call predecessors, (1126), 384 states have return successors, (1124), 1092 states have call predecessors, (1124), 1124 states have call successors, (1124) [2022-11-03 02:13:55,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9291 states to 9291 states and 13806 transitions. [2022-11-03 02:13:55,949 INFO L78 Accepts]: Start accepts. Automaton has 9291 states and 13806 transitions. Word has length 123 [2022-11-03 02:13:55,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:13:55,950 INFO L495 AbstractCegarLoop]: Abstraction has 9291 states and 13806 transitions. [2022-11-03 02:13:55,951 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-03 02:13:55,951 INFO L276 IsEmpty]: Start isEmpty. Operand 9291 states and 13806 transitions. [2022-11-03 02:13:55,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 02:13:55,972 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:13:55,973 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, 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, 1, 1, 1] [2022-11-03 02:13:56,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:13:56,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 02:13:56,191 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:13:56,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:13:56,192 INFO L85 PathProgramCache]: Analyzing trace with hash 2056423549, now seen corresponding path program 1 times [2022-11-03 02:13:56,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:13:56,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552343816] [2022-11-03 02:13:56,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:13:56,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:13:56,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:13:56,759 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-03 02:13:56,760 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:13:56,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552343816] [2022-11-03 02:13:56,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552343816] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:13:56,760 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:13:56,760 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-03 02:13:56,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824337871] [2022-11-03 02:13:56,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:13:56,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 02:13:56,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:13:56,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 02:13:56,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:13:56,762 INFO L87 Difference]: Start difference. First operand 9291 states and 13806 transitions. Second operand has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 02:13:59,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:13:59,172 INFO L93 Difference]: Finished difference Result 29779 states and 44565 transitions. [2022-11-03 02:13:59,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:13:59,173 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 123 [2022-11-03 02:13:59,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:13:59,298 INFO L225 Difference]: With dead ends: 29779 [2022-11-03 02:13:59,298 INFO L226 Difference]: Without dead ends: 20495 [2022-11-03 02:13:59,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-03 02:13:59,328 INFO L413 NwaCegarLoop]: 240 mSDtfsCounter, 769 mSDsluCounter, 608 mSDsCounter, 0 mSdLazyCounter, 352 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 788 SdHoareTripleChecker+Valid, 740 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:13:59,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [788 Valid, 740 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 352 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:13:59,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20495 states. [2022-11-03 02:14:01,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20495 to 18187. [2022-11-03 02:14:01,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18187 states, 15236 states have (on average 1.4788658440535574) internal successors, (22532), 15302 states have internal predecessors, (22532), 2182 states have call successors, (2182), 769 states have call predecessors, (2182), 768 states have return successors, (2180), 2116 states have call predecessors, (2180), 2180 states have call successors, (2180) [2022-11-03 02:14:01,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18187 states to 18187 states and 26894 transitions. [2022-11-03 02:14:01,316 INFO L78 Accepts]: Start accepts. Automaton has 18187 states and 26894 transitions. Word has length 123 [2022-11-03 02:14:01,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:14:01,317 INFO L495 AbstractCegarLoop]: Abstraction has 18187 states and 26894 transitions. [2022-11-03 02:14:01,317 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 02:14:01,317 INFO L276 IsEmpty]: Start isEmpty. Operand 18187 states and 26894 transitions. [2022-11-03 02:14:01,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-03 02:14:01,356 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:14:01,356 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, 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, 1, 1, 1, 1] [2022-11-03 02:14:01,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-11-03 02:14:01,357 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:14:01,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:14:01,357 INFO L85 PathProgramCache]: Analyzing trace with hash -494837157, now seen corresponding path program 1 times [2022-11-03 02:14:01,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:14:01,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112598080] [2022-11-03 02:14:01,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:14:01,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:14:01,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:14:01,916 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-03 02:14:01,916 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:14:01,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112598080] [2022-11-03 02:14:01,917 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112598080] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:14:01,917 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:14:01,917 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-03 02:14:01,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294728931] [2022-11-03 02:14:01,918 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:14:01,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 02:14:01,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:14:01,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 02:14:01,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:14:01,920 INFO L87 Difference]: Start difference. First operand 18187 states and 26894 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 02:14:06,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:14:06,038 INFO L93 Difference]: Finished difference Result 63123 states and 93461 transitions. [2022-11-03 02:14:06,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:14:06,039 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 124 [2022-11-03 02:14:06,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:14:06,245 INFO L225 Difference]: With dead ends: 63123 [2022-11-03 02:14:06,245 INFO L226 Difference]: Without dead ends: 44943 [2022-11-03 02:14:06,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-03 02:14:06,305 INFO L413 NwaCegarLoop]: 241 mSDtfsCounter, 911 mSDsluCounter, 642 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 930 SdHoareTripleChecker+Valid, 770 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:14:06,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [930 Valid, 770 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:14:06,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44943 states. [2022-11-03 02:14:09,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44943 to 35595. [2022-11-03 02:14:09,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35595 states, 29828 states have (on average 1.4720396942470162) internal successors, (43908), 29958 states have internal predecessors, (43908), 4230 states have call successors, (4230), 1537 states have call predecessors, (4230), 1536 states have return successors, (4228), 4100 states have call predecessors, (4228), 4228 states have call successors, (4228) [2022-11-03 02:14:10,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35595 states to 35595 states and 52366 transitions. [2022-11-03 02:14:10,013 INFO L78 Accepts]: Start accepts. Automaton has 35595 states and 52366 transitions. Word has length 124 [2022-11-03 02:14:10,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:14:10,014 INFO L495 AbstractCegarLoop]: Abstraction has 35595 states and 52366 transitions. [2022-11-03 02:14:10,014 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 02:14:10,014 INFO L276 IsEmpty]: Start isEmpty. Operand 35595 states and 52366 transitions. [2022-11-03 02:14:10,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-11-03 02:14:10,098 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:14:10,099 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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, 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] [2022-11-03 02:14:10,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-03 02:14:10,099 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:14:10,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:14:10,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1444801016, now seen corresponding path program 1 times [2022-11-03 02:14:10,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:14:10,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264836005] [2022-11-03 02:14:10,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:14:10,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:14:10,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:14:10,407 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 10 proven. 35 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:14:10,407 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:14:10,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264836005] [2022-11-03 02:14:10,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264836005] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:14:10,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347842180] [2022-11-03 02:14:10,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:14:10,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:14:10,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:14:10,411 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:14:10,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:14:10,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:14:10,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 938 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:14:10,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:14:10,689 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-03 02:14:10,689 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:14:10,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347842180] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:14:10,689 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:14:10,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 02:14:10,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730194156] [2022-11-03 02:14:10,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:14:10,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:14:10,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:14:10,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:14:10,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:14:10,692 INFO L87 Difference]: Start difference. First operand 35595 states and 52366 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 02:14:15,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:14:15,032 INFO L93 Difference]: Finished difference Result 63119 states and 94353 transitions. [2022-11-03 02:14:15,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:14:15,033 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 145 [2022-11-03 02:14:15,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:14:15,260 INFO L225 Difference]: With dead ends: 63119 [2022-11-03 02:14:15,260 INFO L226 Difference]: Without dead ends: 44811 [2022-11-03 02:14:15,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:14:15,320 INFO L413 NwaCegarLoop]: 324 mSDtfsCounter, 106 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:14:15,320 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 546 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:14:15,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44811 states. [2022-11-03 02:14:19,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44811 to 42059. [2022-11-03 02:14:19,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42059 states, 36036 states have (on average 1.5132645132645133) internal successors, (54532), 36166 states have internal predecessors, (54532), 4358 states have call successors, (4358), 1665 states have call predecessors, (4358), 1664 states have return successors, (4356), 4228 states have call predecessors, (4356), 4356 states have call successors, (4356) [2022-11-03 02:14:19,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42059 states to 42059 states and 63246 transitions. [2022-11-03 02:14:19,290 INFO L78 Accepts]: Start accepts. Automaton has 42059 states and 63246 transitions. Word has length 145 [2022-11-03 02:14:19,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:14:19,293 INFO L495 AbstractCegarLoop]: Abstraction has 42059 states and 63246 transitions. [2022-11-03 02:14:19,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 02:14:19,294 INFO L276 IsEmpty]: Start isEmpty. Operand 42059 states and 63246 transitions. [2022-11-03 02:14:19,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-11-03 02:14:19,460 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:14:19,460 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:14:19,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:14:19,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 02:14:19,685 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:14:19,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:14:19,686 INFO L85 PathProgramCache]: Analyzing trace with hash 535991458, now seen corresponding path program 1 times [2022-11-03 02:14:19,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:14:19,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584946088] [2022-11-03 02:14:19,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:14:19,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:14:19,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:14:20,202 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 69 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-11-03 02:14:20,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:14:20,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584946088] [2022-11-03 02:14:20,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584946088] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:14:20,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035498735] [2022-11-03 02:14:20,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:14:20,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:14:20,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:14:20,205 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:14:20,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f04ec3c-989f-46f3-a695-78f5ed776833/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:14:20,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:14:20,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 1166 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:14:20,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:14:20,670 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2022-11-03 02:14:20,670 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:14:20,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035498735] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:14:20,671 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:14:20,671 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2022-11-03 02:14:20,671 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272568996] [2022-11-03 02:14:20,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:14:20,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:14:20,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:14:20,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:14:20,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:14:20,673 INFO L87 Difference]: Start difference. First operand 42059 states and 63246 transitions. Second operand has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-03 02:14:27,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:14:27,008 INFO L93 Difference]: Finished difference Result 125396 states and 190871 transitions. [2022-11-03 02:14:27,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:14:27,009 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 189 [2022-11-03 02:14:27,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:14:27,503 INFO L225 Difference]: With dead ends: 125396 [2022-11-03 02:14:27,504 INFO L226 Difference]: Without dead ends: 83343 [2022-11-03 02:14:27,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:14:27,602 INFO L413 NwaCegarLoop]: 238 mSDtfsCounter, 165 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:14:27,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 440 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:14:27,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83343 states.