./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.07.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b 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_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.07.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9 --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 d7b83251f9a608d2befdac3ab06beaba9889f30d8ab1cb865fc88ebdabcb52dd --- 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-6b4ec56 [2022-11-20 20:15:18,162 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 20:15:18,164 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 20:15:18,194 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 20:15:18,197 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 20:15:18,201 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 20:15:18,203 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 20:15:18,207 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 20:15:18,209 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 20:15:18,214 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 20:15:18,216 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 20:15:18,218 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 20:15:18,218 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 20:15:18,223 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 20:15:18,224 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 20:15:18,226 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 20:15:18,228 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 20:15:18,229 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 20:15:18,230 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 20:15:18,237 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 20:15:18,238 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 20:15:18,240 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 20:15:18,241 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 20:15:18,241 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 20:15:18,247 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 20:15:18,247 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 20:15:18,248 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 20:15:18,248 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 20:15:18,249 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 20:15:18,250 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 20:15:18,250 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 20:15:18,251 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 20:15:18,252 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 20:15:18,253 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 20:15:18,254 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 20:15:18,254 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 20:15:18,258 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 20:15:18,260 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 20:15:18,260 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 20:15:18,264 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 20:15:18,264 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 20:15:18,265 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 20:15:18,306 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 20:15:18,307 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 20:15:18,307 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 20:15:18,307 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 20:15:18,308 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 20:15:18,309 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 20:15:18,309 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 20:15:18,309 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 20:15:18,309 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 20:15:18,310 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 20:15:18,311 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 20:15:18,311 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 20:15:18,311 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 20:15:18,312 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 20:15:18,312 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 20:15:18,312 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 20:15:18,312 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 20:15:18,313 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 20:15:18,313 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 20:15:18,314 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 20:15:18,314 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 20:15:18,314 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 20:15:18,314 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 20:15:18,315 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 20:15:18,315 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 20:15:18,315 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 20:15:18,316 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 20:15:18,316 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 20:15:18,317 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 20:15:18,317 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 20:15:18,317 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 20:15:18,318 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 20:15:18,318 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:15:18,318 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 20:15:18,318 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 20:15:18,319 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 20:15:18,319 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 20:15:18,320 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 20:15:18,320 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 20:15:18,320 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 20:15:18,320 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 20:15:18,321 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_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d7b83251f9a608d2befdac3ab06beaba9889f30d8ab1cb865fc88ebdabcb52dd [2022-11-20 20:15:18,598 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 20:15:18,627 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 20:15:18,630 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 20:15:18,631 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 20:15:18,632 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 20:15:18,633 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.07.cil-2.c [2022-11-20 20:15:21,751 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 20:15:22,011 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 20:15:22,012 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.07.cil-2.c [2022-11-20 20:15:22,024 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/data/edd912efb/aeabbdd40cb7449d9ca8c06370269991/FLAG92dba70cd [2022-11-20 20:15:22,045 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/data/edd912efb/aeabbdd40cb7449d9ca8c06370269991 [2022-11-20 20:15:22,050 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 20:15:22,052 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 20:15:22,056 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 20:15:22,056 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 20:15:22,060 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 20:15:22,061 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,062 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2269eac2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22, skipping insertion in model container [2022-11-20 20:15:22,062 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,069 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 20:15:22,120 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 20:15:22,262 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.07.cil-2.c[914,927] [2022-11-20 20:15:22,320 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.07.cil-2.c[7115,7128] [2022-11-20 20:15:22,407 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:15:22,423 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 20:15:22,452 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.07.cil-2.c[914,927] [2022-11-20 20:15:22,493 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.07.cil-2.c[7115,7128] [2022-11-20 20:15:22,540 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:15:22,574 INFO L208 MainTranslator]: Completed translation [2022-11-20 20:15:22,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22 WrapperNode [2022-11-20 20:15:22,575 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 20:15:22,576 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 20:15:22,576 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 20:15:22,576 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 20:15:22,583 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,595 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,648 INFO L138 Inliner]: procedures = 67, calls = 79, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 755 [2022-11-20 20:15:22,651 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 20:15:22,651 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 20:15:22,651 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 20:15:22,652 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 20:15:22,662 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,663 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,676 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,676 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,696 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,720 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,743 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,746 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,750 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 20:15:22,751 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 20:15:22,751 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 20:15:22,752 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 20:15:22,752 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (1/1) ... [2022-11-20 20:15:22,767 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:15:22,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:15:22,804 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 20:15:22,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 20:15:22,848 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 20:15:22,848 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-20 20:15:22,849 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-20 20:15:22,849 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2022-11-20 20:15:22,849 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2022-11-20 20:15:22,849 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-11-20 20:15:22,849 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-11-20 20:15:22,849 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-11-20 20:15:22,850 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-11-20 20:15:22,850 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2022-11-20 20:15:22,850 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2022-11-20 20:15:22,850 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-11-20 20:15:22,850 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-11-20 20:15:22,851 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-11-20 20:15:22,851 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-11-20 20:15:22,851 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2022-11-20 20:15:22,851 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2022-11-20 20:15:22,851 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2022-11-20 20:15:22,851 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2022-11-20 20:15:22,852 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2022-11-20 20:15:22,852 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2022-11-20 20:15:22,853 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-11-20 20:15:22,853 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-11-20 20:15:22,853 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 20:15:22,854 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-11-20 20:15:22,854 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-11-20 20:15:22,854 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2022-11-20 20:15:22,856 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2022-11-20 20:15:22,856 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 20:15:22,856 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 20:15:22,857 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-11-20 20:15:22,857 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-11-20 20:15:22,857 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-11-20 20:15:22,857 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-11-20 20:15:23,030 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 20:15:23,032 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 20:15:23,889 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 20:15:24,400 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 20:15:24,400 INFO L300 CfgBuilder]: Removed 14 assume(true) statements. [2022-11-20 20:15:24,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:15:24 BoogieIcfgContainer [2022-11-20 20:15:24,408 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 20:15:24,411 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 20:15:24,411 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 20:15:24,414 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 20:15:24,415 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 08:15:22" (1/3) ... [2022-11-20 20:15:24,416 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77e5a2e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:15:24, skipping insertion in model container [2022-11-20 20:15:24,416 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:15:22" (2/3) ... [2022-11-20 20:15:24,419 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77e5a2e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:15:24, skipping insertion in model container [2022-11-20 20:15:24,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:15:24" (3/3) ... [2022-11-20 20:15:24,420 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1+token_ring.07.cil-2.c [2022-11-20 20:15:24,439 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 20:15:24,440 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-20 20:15:24,513 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 20:15:24,519 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;@47d65d83, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 20:15:24,519 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-20 20:15:24,524 INFO L276 IsEmpty]: Start isEmpty. Operand has 211 states, 156 states have (on average 1.5320512820512822) internal successors, (239), 164 states have internal predecessors, (239), 37 states have call successors, (37), 15 states have call predecessors, (37), 15 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2022-11-20 20:15:24,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-20 20:15:24,532 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:15:24,533 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] [2022-11-20 20:15:24,533 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:15:24,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:15:24,537 INFO L85 PathProgramCache]: Analyzing trace with hash -787959122, now seen corresponding path program 1 times [2022-11-20 20:15:24,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:15:24,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846361107] [2022-11-20 20:15:24,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:15:24,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:15:24,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:15:24,917 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:15:24,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:15:24,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846361107] [2022-11-20 20:15:24,919 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846361107] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:15:24,919 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:15:24,920 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:15:24,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777682644] [2022-11-20 20:15:24,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:15:24,926 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:15:24,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:15:24,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:15:24,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:15:24,957 INFO L87 Difference]: Start difference. First operand has 211 states, 156 states have (on average 1.5320512820512822) internal successors, (239), 164 states have internal predecessors, (239), 37 states have call successors, (37), 15 states have call predecessors, (37), 15 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-20 20:15:25,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:15:25,387 INFO L93 Difference]: Finished difference Result 472 states and 697 transitions. [2022-11-20 20:15:25,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:15:25,389 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2022-11-20 20:15:25,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:15:25,400 INFO L225 Difference]: With dead ends: 472 [2022-11-20 20:15:25,400 INFO L226 Difference]: Without dead ends: 265 [2022-11-20 20:15:25,404 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 [2022-11-20 20:15:25,407 INFO L413 NwaCegarLoop]: 305 mSDtfsCounter, 359 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:15:25,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [359 Valid, 520 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:15:25,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2022-11-20 20:15:25,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 258. [2022-11-20 20:15:25,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 191 states have (on average 1.4240837696335078) internal successors, (272), 196 states have internal predecessors, (272), 45 states have call successors, (45), 22 states have call predecessors, (45), 20 states have return successors, (41), 41 states have call predecessors, (41), 41 states have call successors, (41) [2022-11-20 20:15:25,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 358 transitions. [2022-11-20 20:15:25,471 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 358 transitions. Word has length 45 [2022-11-20 20:15:25,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:15:25,472 INFO L495 AbstractCegarLoop]: Abstraction has 258 states and 358 transitions. [2022-11-20 20:15:25,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-20 20:15:25,472 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 358 transitions. [2022-11-20 20:15:25,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-20 20:15:25,475 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:15:25,475 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] [2022-11-20 20:15:25,475 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 20:15:25,476 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:15:25,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:15:25,476 INFO L85 PathProgramCache]: Analyzing trace with hash 131015501, now seen corresponding path program 1 times [2022-11-20 20:15:25,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:15:25,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451370807] [2022-11-20 20:15:25,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:15:25,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:15:25,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:15:25,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:15:25,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:15:25,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451370807] [2022-11-20 20:15:25,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451370807] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:15:25,614 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:15:25,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 20:15:25,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423832777] [2022-11-20 20:15:25,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:15:25,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:15:25,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:15:25,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:15:25,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:15:25,617 INFO L87 Difference]: Start difference. First operand 258 states and 358 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-20 20:15:26,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:15:26,330 INFO L93 Difference]: Finished difference Result 660 states and 861 transitions. [2022-11-20 20:15:26,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:15:26,331 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2022-11-20 20:15:26,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:15:26,336 INFO L225 Difference]: With dead ends: 660 [2022-11-20 20:15:26,336 INFO L226 Difference]: Without dead ends: 528 [2022-11-20 20:15:26,337 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:15:26,339 INFO L413 NwaCegarLoop]: 382 mSDtfsCounter, 760 mSDsluCounter, 578 mSDsCounter, 0 mSdLazyCounter, 572 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 764 SdHoareTripleChecker+Valid, 960 SdHoareTripleChecker+Invalid, 828 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:15:26,339 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [764 Valid, 960 Invalid, 828 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 572 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 20:15:26,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2022-11-20 20:15:26,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 444. [2022-11-20 20:15:26,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 323 states have (on average 1.3374613003095974) internal successors, (432), 329 states have internal predecessors, (432), 72 states have call successors, (72), 45 states have call predecessors, (72), 47 states have return successors, (72), 71 states have call predecessors, (72), 68 states have call successors, (72) [2022-11-20 20:15:26,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 576 transitions. [2022-11-20 20:15:26,395 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 576 transitions. Word has length 45 [2022-11-20 20:15:26,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:15:26,395 INFO L495 AbstractCegarLoop]: Abstraction has 444 states and 576 transitions. [2022-11-20 20:15:26,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-20 20:15:26,396 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 576 transitions. [2022-11-20 20:15:26,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-20 20:15:26,398 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:15:26,398 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] [2022-11-20 20:15:26,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-20 20:15:26,398 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:15:26,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:15:26,399 INFO L85 PathProgramCache]: Analyzing trace with hash 893128630, now seen corresponding path program 1 times [2022-11-20 20:15:26,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:15:26,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535532043] [2022-11-20 20:15:26,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:15:26,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:15:26,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:15:26,720 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:15:26,720 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:15:26,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535532043] [2022-11-20 20:15:26,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535532043] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:15:26,722 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:15:26,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-20 20:15:26,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519295087] [2022-11-20 20:15:26,722 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:15:26,723 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 20:15:26,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:15:26,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 20:15:26,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:15:26,726 INFO L87 Difference]: Start difference. First operand 444 states and 576 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-20 20:15:27,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:15:27,500 INFO L93 Difference]: Finished difference Result 960 states and 1192 transitions. [2022-11-20 20:15:27,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-20 20:15:27,501 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2022-11-20 20:15:27,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:15:27,505 INFO L225 Difference]: With dead ends: 960 [2022-11-20 20:15:27,506 INFO L226 Difference]: Without dead ends: 658 [2022-11-20 20:15:27,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-11-20 20:15:27,517 INFO L413 NwaCegarLoop]: 170 mSDtfsCounter, 428 mSDsluCounter, 595 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 454 SdHoareTripleChecker+Valid, 765 SdHoareTripleChecker+Invalid, 906 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:15:27,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [454 Valid, 765 Invalid, 906 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 20:15:27,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2022-11-20 20:15:27,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 623. [2022-11-20 20:15:27,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 623 states, 448 states have (on average 1.3035714285714286) internal successors, (584), 455 states have internal predecessors, (584), 99 states have call successors, (99), 68 states have call predecessors, (99), 74 states have return successors, (103), 101 states have call predecessors, (103), 95 states have call successors, (103) [2022-11-20 20:15:27,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 623 states to 623 states and 786 transitions. [2022-11-20 20:15:27,610 INFO L78 Accepts]: Start accepts. Automaton has 623 states and 786 transitions. Word has length 46 [2022-11-20 20:15:27,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:15:27,611 INFO L495 AbstractCegarLoop]: Abstraction has 623 states and 786 transitions. [2022-11-20 20:15:27,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-20 20:15:27,612 INFO L276 IsEmpty]: Start isEmpty. Operand 623 states and 786 transitions. [2022-11-20 20:15:27,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-20 20:15:27,621 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:15:27,622 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] [2022-11-20 20:15:27,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-20 20:15:27,622 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:15:27,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:15:27,623 INFO L85 PathProgramCache]: Analyzing trace with hash -1694912325, now seen corresponding path program 1 times [2022-11-20 20:15:27,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:15:27,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886623774] [2022-11-20 20:15:27,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:15:27,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:15:27,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:15:27,722 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:15:27,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:15:27,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886623774] [2022-11-20 20:15:27,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886623774] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:15:27,723 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:15:27,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:15:27,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105967106] [2022-11-20 20:15:27,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:15:27,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:15:27,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:15:27,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:15:27,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:15:27,727 INFO L87 Difference]: Start difference. First operand 623 states and 786 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 20:15:27,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:15:27,912 INFO L93 Difference]: Finished difference Result 1187 states and 1456 transitions. [2022-11-20 20:15:27,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:15:27,913 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), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2022-11-20 20:15:27,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:15:27,923 INFO L225 Difference]: With dead ends: 1187 [2022-11-20 20:15:27,923 INFO L226 Difference]: Without dead ends: 755 [2022-11-20 20:15:27,927 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 [2022-11-20 20:15:27,935 INFO L413 NwaCegarLoop]: 261 mSDtfsCounter, 67 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:15:27,936 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 484 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:15:27,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2022-11-20 20:15:28,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 650. [2022-11-20 20:15:28,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 650 states, 471 states have (on average 1.2929936305732483) internal successors, (609), 478 states have internal predecessors, (609), 101 states have call successors, (101), 70 states have call predecessors, (101), 76 states have return successors, (105), 103 states have call predecessors, (105), 97 states have call successors, (105) [2022-11-20 20:15:28,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 650 states to 650 states and 815 transitions. [2022-11-20 20:15:28,020 INFO L78 Accepts]: Start accepts. Automaton has 650 states and 815 transitions. Word has length 47 [2022-11-20 20:15:28,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:15:28,022 INFO L495 AbstractCegarLoop]: Abstraction has 650 states and 815 transitions. [2022-11-20 20:15:28,023 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), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 20:15:28,023 INFO L276 IsEmpty]: Start isEmpty. Operand 650 states and 815 transitions. [2022-11-20 20:15:28,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-20 20:15:28,037 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:15:28,038 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:15:28,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-20 20:15:28,042 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:15:28,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:15:28,042 INFO L85 PathProgramCache]: Analyzing trace with hash -950435024, now seen corresponding path program 1 times [2022-11-20 20:15:28,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:15:28,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679496300] [2022-11-20 20:15:28,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:15:28,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:15:28,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:15:28,120 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:15:28,121 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:15:28,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679496300] [2022-11-20 20:15:28,121 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [679496300] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:15:28,121 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:15:28,122 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:15:28,122 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764456009] [2022-11-20 20:15:28,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:15:28,123 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:15:28,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:15:28,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:15:28,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:15:28,125 INFO L87 Difference]: Start difference. First operand 650 states and 815 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 20:15:28,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:15:28,265 INFO L93 Difference]: Finished difference Result 840 states and 1036 transitions. [2022-11-20 20:15:28,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:15:28,265 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 53 [2022-11-20 20:15:28,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:15:28,269 INFO L225 Difference]: With dead ends: 840 [2022-11-20 20:15:28,269 INFO L226 Difference]: Without dead ends: 567 [2022-11-20 20:15:28,270 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 [2022-11-20 20:15:28,272 INFO L413 NwaCegarLoop]: 259 mSDtfsCounter, 264 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 320 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 [2022-11-20 20:15:28,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 320 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:15:28,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2022-11-20 20:15:28,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 458. [2022-11-20 20:15:28,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 331 states have (on average 1.2900302114803626) internal successors, (427), 336 states have internal predecessors, (427), 77 states have call successors, (77), 50 states have call predecessors, (77), 48 states have return successors, (73), 73 states have call predecessors, (73), 73 states have call successors, (73) [2022-11-20 20:15:28,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 577 transitions. [2022-11-20 20:15:28,337 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 577 transitions. Word has length 53 [2022-11-20 20:15:28,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:15:28,337 INFO L495 AbstractCegarLoop]: Abstraction has 458 states and 577 transitions. [2022-11-20 20:15:28,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 20:15:28,338 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 577 transitions. [2022-11-20 20:15:28,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-20 20:15:28,340 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:15:28,340 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:15:28,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-20 20:15:28,341 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:15:28,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:15:28,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1089116244, now seen corresponding path program 1 times [2022-11-20 20:15:28,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:15:28,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508495810] [2022-11-20 20:15:28,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:15:28,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:15:28,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:15:28,456 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:15:28,456 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:15:28,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508495810] [2022-11-20 20:15:28,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508495810] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:15:28,457 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:15:28,457 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:15:28,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406349974] [2022-11-20 20:15:28,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:15:28,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:15:28,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:15:28,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:15:28,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:15:28,459 INFO L87 Difference]: Start difference. First operand 458 states and 577 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2022-11-20 20:15:28,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:15:28,782 INFO L93 Difference]: Finished difference Result 561 states and 693 transitions. [2022-11-20 20:15:28,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:15:28,782 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 54 [2022-11-20 20:15:28,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:15:28,787 INFO L225 Difference]: With dead ends: 561 [2022-11-20 20:15:28,787 INFO L226 Difference]: Without dead ends: 558 [2022-11-20 20:15:28,787 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 [2022-11-20 20:15:28,788 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 481 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 481 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:15:28,789 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [481 Valid, 296 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:15:28,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 558 states. [2022-11-20 20:15:28,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 558 to 457. [2022-11-20 20:15:28,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 331 states have (on average 1.2809667673716012) internal successors, (424), 335 states have internal predecessors, (424), 76 states have call successors, (76), 50 states have call predecessors, (76), 48 states have return successors, (73), 73 states have call predecessors, (73), 73 states have call successors, (73) [2022-11-20 20:15:28,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 573 transitions. [2022-11-20 20:15:28,843 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 573 transitions. Word has length 54 [2022-11-20 20:15:28,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:15:28,844 INFO L495 AbstractCegarLoop]: Abstraction has 457 states and 573 transitions. [2022-11-20 20:15:28,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2022-11-20 20:15:28,844 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 573 transitions. [2022-11-20 20:15:28,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-20 20:15:28,845 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:15:28,845 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:15:28,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-20 20:15:28,846 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:15:28,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:15:28,847 INFO L85 PathProgramCache]: Analyzing trace with hash -598229468, now seen corresponding path program 1 times [2022-11-20 20:15:28,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:15:28,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134617951] [2022-11-20 20:15:28,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:15:28,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:15:28,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:15:28,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:15:28,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:15:28,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134617951] [2022-11-20 20:15:28,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134617951] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:15:28,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703506899] [2022-11-20 20:15:28,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:15:28,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:15:28,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:15:28,983 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:15:28,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 20:15:29,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:15:29,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:15:29,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:15:29,498 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:15:29,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:15:29,692 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:15:29,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703506899] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:15:29,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [543357458] [2022-11-20 20:15:29,714 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2022-11-20 20:15:29,715 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:15:29,719 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:15:29,724 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:15:29,725 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:15:33,874 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 155 for LOIs [2022-11-20 20:15:33,903 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 151 for LOIs [2022-11-20 20:15:33,963 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 159 for LOIs [2022-11-20 20:15:34,634 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 155 for LOIs [2022-11-20 20:15:34,710 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 155 for LOIs [2022-11-20 20:15:34,780 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 155 for LOIs [2022-11-20 20:15:34,807 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 162 for LOIs [2022-11-20 20:15:34,838 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:15:51,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [543357458] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:15:51,471 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:15:51,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [5, 5, 4] total 41 [2022-11-20 20:15:51,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702512067] [2022-11-20 20:15:51,472 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:15:51,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-20 20:15:51,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:15:51,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-20 20:15:51,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1447, Unknown=0, NotChecked=0, Total=1640 [2022-11-20 20:15:51,474 INFO L87 Difference]: Start difference. First operand 457 states and 573 transitions. Second operand has 36 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-20 20:16:18,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:16:18,267 INFO L93 Difference]: Finished difference Result 821 states and 984 transitions. [2022-11-20 20:16:18,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-20 20:16:18,267 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 55 [2022-11-20 20:16:18,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:16:18,270 INFO L225 Difference]: With dead ends: 821 [2022-11-20 20:16:18,270 INFO L226 Difference]: Without dead ends: 506 [2022-11-20 20:16:18,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 124 SyntacticMatches, 5 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 35.9s TimeCoverageRelationStatistics Valid=601, Invalid=4091, Unknown=0, NotChecked=0, Total=4692 [2022-11-20 20:16:18,273 INFO L413 NwaCegarLoop]: 227 mSDtfsCounter, 189 mSDsluCounter, 1736 mSDsCounter, 0 mSdLazyCounter, 4005 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 1963 SdHoareTripleChecker+Invalid, 4189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 4005 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:16:18,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [191 Valid, 1963 Invalid, 4189 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [184 Valid, 4005 Invalid, 0 Unknown, 0 Unchecked, 7.3s Time] [2022-11-20 20:16:18,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2022-11-20 20:16:18,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 491. [2022-11-20 20:16:18,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 357 states have (on average 1.2661064425770308) internal successors, (452), 361 states have internal predecessors, (452), 78 states have call successors, (78), 56 states have call predecessors, (78), 54 states have return successors, (75), 75 states have call predecessors, (75), 75 states have call successors, (75) [2022-11-20 20:16:18,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 605 transitions. [2022-11-20 20:16:18,363 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 605 transitions. Word has length 55 [2022-11-20 20:16:18,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:16:18,364 INFO L495 AbstractCegarLoop]: Abstraction has 491 states and 605 transitions. [2022-11-20 20:16:18,364 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-20 20:16:18,364 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 605 transitions. [2022-11-20 20:16:18,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-20 20:16:18,366 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:16:18,366 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] [2022-11-20 20:16:18,377 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-20 20:16:18,571 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:16:18,572 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:16:18,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:16:18,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1859420041, now seen corresponding path program 1 times [2022-11-20 20:16:18,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:16:18,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416477901] [2022-11-20 20:16:18,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:16:18,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:16:18,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:16:18,694 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:16:18,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:16:18,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416477901] [2022-11-20 20:16:18,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416477901] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:16:18,695 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:16:18,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-20 20:16:18,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155483822] [2022-11-20 20:16:18,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:16:18,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:16:18,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:16:18,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:16:18,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:16:18,697 INFO L87 Difference]: Start difference. First operand 491 states and 605 transitions. Second operand has 5 states, 5 states have (on average 8.4) internal successors, (42), 5 states have internal predecessors, (42), 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) [2022-11-20 20:16:19,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:16:19,534 INFO L93 Difference]: Finished difference Result 1104 states and 1595 transitions. [2022-11-20 20:16:19,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:16:19,535 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.4) internal successors, (42), 5 states have internal predecessors, (42), 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 53 [2022-11-20 20:16:19,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:16:19,541 INFO L225 Difference]: With dead ends: 1104 [2022-11-20 20:16:19,541 INFO L226 Difference]: Without dead ends: 973 [2022-11-20 20:16:19,543 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:16:19,543 INFO L413 NwaCegarLoop]: 448 mSDtfsCounter, 989 mSDsluCounter, 589 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 241 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1001 SdHoareTripleChecker+Valid, 1037 SdHoareTripleChecker+Invalid, 749 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 241 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-20 20:16:19,544 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1001 Valid, 1037 Invalid, 749 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [241 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-20 20:16:19,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 973 states. [2022-11-20 20:16:19,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 973 to 960. [2022-11-20 20:16:19,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 960 states, 737 states have (on average 1.383989145183175) internal successors, (1020), 744 states have internal predecessors, (1020), 143 states have call successors, (143), 80 states have call predecessors, (143), 78 states have return successors, (182), 137 states have call predecessors, (182), 140 states have call successors, (182) [2022-11-20 20:16:19,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 960 states to 960 states and 1345 transitions. [2022-11-20 20:16:19,681 INFO L78 Accepts]: Start accepts. Automaton has 960 states and 1345 transitions. Word has length 53 [2022-11-20 20:16:19,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:16:19,681 INFO L495 AbstractCegarLoop]: Abstraction has 960 states and 1345 transitions. [2022-11-20 20:16:19,682 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.4) internal successors, (42), 5 states have internal predecessors, (42), 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) [2022-11-20 20:16:19,682 INFO L276 IsEmpty]: Start isEmpty. Operand 960 states and 1345 transitions. [2022-11-20 20:16:19,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-20 20:16:19,683 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:16:19,683 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:16:19,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-20 20:16:19,684 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:16:19,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:16:19,684 INFO L85 PathProgramCache]: Analyzing trace with hash -756259008, now seen corresponding path program 1 times [2022-11-20 20:16:19,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:16:19,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096070943] [2022-11-20 20:16:19,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:16:19,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:16:19,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:16:19,734 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:16:19,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:16:19,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096070943] [2022-11-20 20:16:19,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2096070943] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:16:19,735 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:16:19,735 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:16:19,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182263086] [2022-11-20 20:16:19,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:16:19,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:16:19,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:16:19,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:16:19,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:16:19,738 INFO L87 Difference]: Start difference. First operand 960 states and 1345 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:16:19,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:16:19,961 INFO L93 Difference]: Finished difference Result 1241 states and 1667 transitions. [2022-11-20 20:16:19,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:16:19,963 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 61 [2022-11-20 20:16:19,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:16:19,969 INFO L225 Difference]: With dead ends: 1241 [2022-11-20 20:16:19,969 INFO L226 Difference]: Without dead ends: 1072 [2022-11-20 20:16:19,970 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 [2022-11-20 20:16:19,971 INFO L413 NwaCegarLoop]: 283 mSDtfsCounter, 42 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:16:19,971 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 523 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:16:19,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1072 states. [2022-11-20 20:16:20,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1072 to 995. [2022-11-20 20:16:20,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 995 states, 766 states have (on average 1.3785900783289817) internal successors, (1056), 773 states have internal predecessors, (1056), 146 states have call successors, (146), 83 states have call predecessors, (146), 81 states have return successors, (185), 140 states have call predecessors, (185), 143 states have call successors, (185) [2022-11-20 20:16:20,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 995 states to 995 states and 1387 transitions. [2022-11-20 20:16:20,127 INFO L78 Accepts]: Start accepts. Automaton has 995 states and 1387 transitions. Word has length 61 [2022-11-20 20:16:20,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:16:20,128 INFO L495 AbstractCegarLoop]: Abstraction has 995 states and 1387 transitions. [2022-11-20 20:16:20,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:16:20,128 INFO L276 IsEmpty]: Start isEmpty. Operand 995 states and 1387 transitions. [2022-11-20 20:16:20,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-20 20:16:20,130 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:16:20,130 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:16:20,130 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-20 20:16:20,130 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:16:20,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:16:20,131 INFO L85 PathProgramCache]: Analyzing trace with hash -117143541, now seen corresponding path program 1 times [2022-11-20 20:16:20,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:16:20,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404642230] [2022-11-20 20:16:20,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:16:20,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:16:20,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:16:20,280 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:16:20,280 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:16:20,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404642230] [2022-11-20 20:16:20,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404642230] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:16:20,280 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:16:20,281 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-20 20:16:20,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207671778] [2022-11-20 20:16:20,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:16:20,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 20:16:20,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:16:20,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 20:16:20,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:16:20,282 INFO L87 Difference]: Start difference. First operand 995 states and 1387 transitions. Second operand has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-20 20:16:21,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:16:21,081 INFO L93 Difference]: Finished difference Result 1458 states and 1913 transitions. [2022-11-20 20:16:21,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-20 20:16:21,081 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 63 [2022-11-20 20:16:21,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:16:21,088 INFO L225 Difference]: With dead ends: 1458 [2022-11-20 20:16:21,088 INFO L226 Difference]: Without dead ends: 1155 [2022-11-20 20:16:21,090 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-11-20 20:16:21,090 INFO L413 NwaCegarLoop]: 160 mSDtfsCounter, 412 mSDsluCounter, 684 mSDsCounter, 0 mSdLazyCounter, 847 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 437 SdHoareTripleChecker+Valid, 844 SdHoareTripleChecker+Invalid, 950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 847 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:16:21,091 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [437 Valid, 844 Invalid, 950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 847 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-20 20:16:21,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1155 states. [2022-11-20 20:16:21,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1155 to 1134. [2022-11-20 20:16:21,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1134 states, 860 states have (on average 1.3476744186046512) internal successors, (1159), 867 states have internal predecessors, (1159), 170 states have call successors, (170), 104 states have call predecessors, (170), 102 states have return successors, (209), 164 states have call predecessors, (209), 167 states have call successors, (209) [2022-11-20 20:16:21,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1134 states to 1134 states and 1538 transitions. [2022-11-20 20:16:21,262 INFO L78 Accepts]: Start accepts. Automaton has 1134 states and 1538 transitions. Word has length 63 [2022-11-20 20:16:21,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:16:21,264 INFO L495 AbstractCegarLoop]: Abstraction has 1134 states and 1538 transitions. [2022-11-20 20:16:21,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-20 20:16:21,264 INFO L276 IsEmpty]: Start isEmpty. Operand 1134 states and 1538 transitions. [2022-11-20 20:16:21,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-20 20:16:21,265 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:16:21,266 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2022-11-20 20:16:21,266 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-20 20:16:21,266 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:16:21,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:16:21,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1160128963, now seen corresponding path program 1 times [2022-11-20 20:16:21,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:16:21,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788573565] [2022-11-20 20:16:21,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:16:21,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:16:21,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:16:21,399 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:16:21,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:16:21,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788573565] [2022-11-20 20:16:21,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788573565] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:16:21,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045911783] [2022-11-20 20:16:21,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:16:21,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:16:21,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:16:21,402 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:16:21,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 20:16:21,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:16:21,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:16:21,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:16:21,773 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:16:21,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:16:21,941 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:16:21,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045911783] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:16:21,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1803876904] [2022-11-20 20:16:21,947 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2022-11-20 20:16:21,947 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:16:21,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:16:21,948 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:16:21,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:16:30,191 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 155 for LOIs [2022-11-20 20:16:30,213 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 223 for LOIs [2022-11-20 20:16:30,283 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 217 for LOIs [2022-11-20 20:16:30,350 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 159 for LOIs [2022-11-20 20:16:30,817 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 155 for LOIs [2022-11-20 20:16:30,867 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 155 for LOIs [2022-11-20 20:16:30,909 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 155 for LOIs [2022-11-20 20:16:30,927 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 162 for LOIs [2022-11-20 20:16:30,944 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:17:02,130 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24083#(and (= ~q_req_up~0 1) (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~t7_i~0 0) (= ~t1_pc~0 0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (= ~E_7~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (<= 0 ~p_dw_pc~0) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t6_st~0) (= ~t2_i~0 0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~c_num_read~0 1) (= ~T7_E~0 2) (= ~m_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~E_2~0 2) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~token~0 0) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (<= ~E_5~0 2) (<= ~m_st~0 0) (<= ~t3_pc~0 0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (= ~E_M~0 2) (= ~a_t~0 0) (<= 0 ~t3_pc~0) (= 0 ~t2_st~0) (<= 2 ~E_5~0) (<= 0 ~m_st~0) (<= ~t4_pc~0 0) (= ~E_1~0 2) (= 0 ~t3_st~0) (<= 0 ~t4_pc~0) (= ~M_E~0 2) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (= ~c_dr_st~0 1) (<= 0 ~t1_st~0) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2022-11-20 20:17:02,130 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:17:02,130 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:17:02,130 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2022-11-20 20:17:02,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376273136] [2022-11-20 20:17:02,130 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:17:02,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 20:17:02,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:02,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 20:17:02,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=1924, Unknown=0, NotChecked=0, Total=2162 [2022-11-20 20:17:02,132 INFO L87 Difference]: Start difference. First operand 1134 states and 1538 transitions. Second operand has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2022-11-20 20:17:02,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:02,934 INFO L93 Difference]: Finished difference Result 2228 states and 2779 transitions. [2022-11-20 20:17:02,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 20:17:02,934 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) Word has length 64 [2022-11-20 20:17:02,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:02,945 INFO L225 Difference]: With dead ends: 2228 [2022-11-20 20:17:02,945 INFO L226 Difference]: Without dead ends: 2225 [2022-11-20 20:17:02,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1043 ImplicationChecksByTransitivity, 31.2s TimeCoverageRelationStatistics Valid=238, Invalid=1924, Unknown=0, NotChecked=0, Total=2162 [2022-11-20 20:17:02,948 INFO L413 NwaCegarLoop]: 361 mSDtfsCounter, 646 mSDsluCounter, 767 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 646 SdHoareTripleChecker+Valid, 1128 SdHoareTripleChecker+Invalid, 730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:02,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [646 Valid, 1128 Invalid, 730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-20 20:17:02,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2225 states. [2022-11-20 20:17:03,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2225 to 1648. [2022-11-20 20:17:03,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1648 states, 1216 states have (on average 1.2976973684210527) internal successors, (1578), 1223 states have internal predecessors, (1578), 254 states have call successors, (254), 178 states have call predecessors, (254), 176 states have return successors, (293), 248 states have call predecessors, (293), 251 states have call successors, (293) [2022-11-20 20:17:03,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1648 states to 1648 states and 2125 transitions. [2022-11-20 20:17:03,232 INFO L78 Accepts]: Start accepts. Automaton has 1648 states and 2125 transitions. Word has length 64 [2022-11-20 20:17:03,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:03,232 INFO L495 AbstractCegarLoop]: Abstraction has 1648 states and 2125 transitions. [2022-11-20 20:17:03,233 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 12.857142857142858) internal successors, (90), 7 states have internal predecessors, (90), 6 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2022-11-20 20:17:03,233 INFO L276 IsEmpty]: Start isEmpty. Operand 1648 states and 2125 transitions. [2022-11-20 20:17:03,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-20 20:17:03,241 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:03,241 INFO L195 NwaCegarLoop]: trace histogram [3, 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, 1, 1, 1] [2022-11-20 20:17:03,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 20:17:03,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-20 20:17:03,457 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:03,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:03,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1642653459, now seen corresponding path program 2 times [2022-11-20 20:17:03,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:03,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498787065] [2022-11-20 20:17:03,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:03,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:03,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:03,502 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:17:03,502 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:03,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498787065] [2022-11-20 20:17:03,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498787065] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:17:03,503 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:17:03,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:17:03,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348846634] [2022-11-20 20:17:03,503 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:17:03,504 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:17:03,504 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:03,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:17:03,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:17:03,505 INFO L87 Difference]: Start difference. First operand 1648 states and 2125 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:17:03,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:03,834 INFO L93 Difference]: Finished difference Result 2400 states and 2981 transitions. [2022-11-20 20:17:03,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:17:03,835 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 67 [2022-11-20 20:17:03,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:03,843 INFO L225 Difference]: With dead ends: 2400 [2022-11-20 20:17:03,843 INFO L226 Difference]: Without dead ends: 1644 [2022-11-20 20:17:03,845 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 [2022-11-20 20:17:03,846 INFO L413 NwaCegarLoop]: 287 mSDtfsCounter, 267 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:03,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 353 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:17:03,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1644 states. [2022-11-20 20:17:04,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1644 to 1633. [2022-11-20 20:17:04,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1633 states, 1201 states have (on average 1.2889258950874272) internal successors, (1548), 1208 states have internal predecessors, (1548), 254 states have call successors, (254), 178 states have call predecessors, (254), 176 states have return successors, (293), 248 states have call predecessors, (293), 251 states have call successors, (293) [2022-11-20 20:17:04,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1633 states to 1633 states and 2095 transitions. [2022-11-20 20:17:04,142 INFO L78 Accepts]: Start accepts. Automaton has 1633 states and 2095 transitions. Word has length 67 [2022-11-20 20:17:04,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:04,142 INFO L495 AbstractCegarLoop]: Abstraction has 1633 states and 2095 transitions. [2022-11-20 20:17:04,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:17:04,143 INFO L276 IsEmpty]: Start isEmpty. Operand 1633 states and 2095 transitions. [2022-11-20 20:17:04,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-20 20:17:04,146 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:04,146 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:17:04,146 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-20 20:17:04,146 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:04,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:04,147 INFO L85 PathProgramCache]: Analyzing trace with hash 278236861, now seen corresponding path program 1 times [2022-11-20 20:17:04,147 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:04,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689346197] [2022-11-20 20:17:04,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:04,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:04,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:04,196 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:17:04,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:04,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689346197] [2022-11-20 20:17:04,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689346197] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:17:04,197 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:17:04,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:17:04,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923431238] [2022-11-20 20:17:04,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:17:04,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:17:04,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:04,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:17:04,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:17:04,199 INFO L87 Difference]: Start difference. First operand 1633 states and 2095 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:17:04,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:04,558 INFO L93 Difference]: Finished difference Result 2599 states and 3189 transitions. [2022-11-20 20:17:04,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:17:04,559 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 71 [2022-11-20 20:17:04,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:04,568 INFO L225 Difference]: With dead ends: 2599 [2022-11-20 20:17:04,568 INFO L226 Difference]: Without dead ends: 1809 [2022-11-20 20:17:04,570 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 [2022-11-20 20:17:04,571 INFO L413 NwaCegarLoop]: 274 mSDtfsCounter, 37 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:04,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 514 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:17:04,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1809 states. [2022-11-20 20:17:04,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1809 to 1680. [2022-11-20 20:17:04,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1680 states, 1240 states have (on average 1.2854838709677419) internal successors, (1594), 1247 states have internal predecessors, (1594), 258 states have call successors, (258), 182 states have call predecessors, (258), 180 states have return successors, (297), 252 states have call predecessors, (297), 255 states have call successors, (297) [2022-11-20 20:17:04,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1680 states to 1680 states and 2149 transitions. [2022-11-20 20:17:04,875 INFO L78 Accepts]: Start accepts. Automaton has 1680 states and 2149 transitions. Word has length 71 [2022-11-20 20:17:04,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:04,876 INFO L495 AbstractCegarLoop]: Abstraction has 1680 states and 2149 transitions. [2022-11-20 20:17:04,876 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:17:04,876 INFO L276 IsEmpty]: Start isEmpty. Operand 1680 states and 2149 transitions. [2022-11-20 20:17:04,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-11-20 20:17:04,879 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:04,879 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:17:04,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-20 20:17:04,880 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:04,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:04,880 INFO L85 PathProgramCache]: Analyzing trace with hash 961528521, now seen corresponding path program 1 times [2022-11-20 20:17:04,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:04,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121898510] [2022-11-20 20:17:04,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:04,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:04,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:05,273 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-20 20:17:05,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:05,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121898510] [2022-11-20 20:17:05,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121898510] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:17:05,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948312326] [2022-11-20 20:17:05,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:05,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:05,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:17:05,279 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:17:05,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 20:17:05,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:05,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:17:05,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:17:05,491 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:17:05,492 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:17:05,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948312326] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:17:05,492 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:17:05,492 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [14] total 17 [2022-11-20 20:17:05,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779918801] [2022-11-20 20:17:05,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:17:05,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:17:05,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:05,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:17:05,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-11-20 20:17:05,496 INFO L87 Difference]: Start difference. First operand 1680 states and 2149 transitions. Second operand has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2022-11-20 20:17:05,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:05,992 INFO L93 Difference]: Finished difference Result 2542 states and 3153 transitions. [2022-11-20 20:17:05,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 20:17:05,993 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 102 [2022-11-20 20:17:05,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:06,003 INFO L225 Difference]: With dead ends: 2542 [2022-11-20 20:17:06,003 INFO L226 Difference]: Without dead ends: 1495 [2022-11-20 20:17:06,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-11-20 20:17:06,007 INFO L413 NwaCegarLoop]: 289 mSDtfsCounter, 262 mSDsluCounter, 792 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 1081 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:06,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 1081 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:17:06,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1495 states. [2022-11-20 20:17:06,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1495 to 1310. [2022-11-20 20:17:06,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1310 states, 1002 states have (on average 1.3203592814371257) internal successors, (1323), 1009 states have internal predecessors, (1323), 187 states have call successors, (187), 121 states have call predecessors, (187), 119 states have return successors, (226), 181 states have call predecessors, (226), 184 states have call successors, (226) [2022-11-20 20:17:06,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1310 states to 1310 states and 1736 transitions. [2022-11-20 20:17:06,269 INFO L78 Accepts]: Start accepts. Automaton has 1310 states and 1736 transitions. Word has length 102 [2022-11-20 20:17:06,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:06,269 INFO L495 AbstractCegarLoop]: Abstraction has 1310 states and 1736 transitions. [2022-11-20 20:17:06,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2022-11-20 20:17:06,270 INFO L276 IsEmpty]: Start isEmpty. Operand 1310 states and 1736 transitions. [2022-11-20 20:17:06,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-11-20 20:17:06,273 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:06,273 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:17:06,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-20 20:17:06,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-20 20:17:06,478 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:06,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:06,479 INFO L85 PathProgramCache]: Analyzing trace with hash 669540574, now seen corresponding path program 1 times [2022-11-20 20:17:06,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:06,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568991337] [2022-11-20 20:17:06,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:06,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:06,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:06,610 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-20 20:17:06,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:06,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568991337] [2022-11-20 20:17:06,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568991337] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:17:06,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823225282] [2022-11-20 20:17:06,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:06,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:06,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:17:06,612 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:17:06,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 20:17:06,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:06,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 20:17:06,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:17:06,845 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-20 20:17:06,845 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:17:06,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823225282] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:17:06,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:17:06,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-20 20:17:06,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877377048] [2022-11-20 20:17:06,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:17:06,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:17:06,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:06,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:17:06,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:17:06,847 INFO L87 Difference]: Start difference. First operand 1310 states and 1736 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 2 states have internal predecessors, (65), 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) [2022-11-20 20:17:07,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:07,210 INFO L93 Difference]: Finished difference Result 2494 states and 3663 transitions. [2022-11-20 20:17:07,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:17:07,210 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 2 states have internal predecessors, (65), 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 102 [2022-11-20 20:17:07,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:07,220 INFO L225 Difference]: With dead ends: 2494 [2022-11-20 20:17:07,220 INFO L226 Difference]: Without dead ends: 1894 [2022-11-20 20:17:07,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:17:07,224 INFO L413 NwaCegarLoop]: 259 mSDtfsCounter, 263 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 417 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:07,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [263 Valid, 417 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:17:07,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1894 states. [2022-11-20 20:17:07,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1894 to 1885. [2022-11-20 20:17:07,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1885 states, 1470 states have (on average 1.3727891156462586) internal successors, (2018), 1480 states have internal predecessors, (2018), 264 states have call successors, (264), 151 states have call predecessors, (264), 149 states have return successors, (341), 255 states have call predecessors, (341), 261 states have call successors, (341) [2022-11-20 20:17:07,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1885 states to 1885 states and 2623 transitions. [2022-11-20 20:17:07,525 INFO L78 Accepts]: Start accepts. Automaton has 1885 states and 2623 transitions. Word has length 102 [2022-11-20 20:17:07,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:07,525 INFO L495 AbstractCegarLoop]: Abstraction has 1885 states and 2623 transitions. [2022-11-20 20:17:07,526 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 2 states have internal predecessors, (65), 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) [2022-11-20 20:17:07,526 INFO L276 IsEmpty]: Start isEmpty. Operand 1885 states and 2623 transitions. [2022-11-20 20:17:07,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-11-20 20:17:07,530 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:07,531 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:17:07,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-20 20:17:07,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:07,738 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:07,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:07,739 INFO L85 PathProgramCache]: Analyzing trace with hash -915296932, now seen corresponding path program 1 times [2022-11-20 20:17:07,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:07,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950155992] [2022-11-20 20:17:07,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:07,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:07,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:07,855 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-20 20:17:07,856 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:07,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950155992] [2022-11-20 20:17:07,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950155992] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:17:07,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647643456] [2022-11-20 20:17:07,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:07,857 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:07,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:17:07,858 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:17:07,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 20:17:08,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:08,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 20:17:08,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:17:08,082 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-20 20:17:08,082 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:17:08,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [647643456] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:17:08,083 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:17:08,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-20 20:17:08,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023788784] [2022-11-20 20:17:08,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:17:08,083 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:17:08,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:08,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:17:08,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:17:08,084 INFO L87 Difference]: Start difference. First operand 1885 states and 2623 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 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) [2022-11-20 20:17:08,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:08,577 INFO L93 Difference]: Finished difference Result 4204 states and 6371 transitions. [2022-11-20 20:17:08,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:17:08,577 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 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 102 [2022-11-20 20:17:08,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:08,590 INFO L225 Difference]: With dead ends: 4204 [2022-11-20 20:17:08,590 INFO L226 Difference]: Without dead ends: 3029 [2022-11-20 20:17:08,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:17:08,596 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 260 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:08,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [260 Valid, 414 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:17:08,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3029 states. [2022-11-20 20:17:08,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3029 to 3015. [2022-11-20 20:17:08,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3015 states, 2391 states have (on average 1.412797992471769) internal successors, (3378), 2407 states have internal predecessors, (3378), 413 states have call successors, (413), 211 states have call predecessors, (413), 209 states have return successors, (562), 398 states have call predecessors, (562), 410 states have call successors, (562) [2022-11-20 20:17:08,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3015 states to 3015 states and 4353 transitions. [2022-11-20 20:17:08,984 INFO L78 Accepts]: Start accepts. Automaton has 3015 states and 4353 transitions. Word has length 102 [2022-11-20 20:17:08,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:08,984 INFO L495 AbstractCegarLoop]: Abstraction has 3015 states and 4353 transitions. [2022-11-20 20:17:08,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 2 states have internal predecessors, (68), 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) [2022-11-20 20:17:08,984 INFO L276 IsEmpty]: Start isEmpty. Operand 3015 states and 4353 transitions. [2022-11-20 20:17:08,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-11-20 20:17:08,990 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:08,990 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:17:09,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 20:17:09,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-20 20:17:09,206 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:09,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:09,207 INFO L85 PathProgramCache]: Analyzing trace with hash -727064162, now seen corresponding path program 1 times [2022-11-20 20:17:09,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:09,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937865910] [2022-11-20 20:17:09,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:09,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:09,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:09,344 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-20 20:17:09,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:09,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937865910] [2022-11-20 20:17:09,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937865910] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:17:09,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648027603] [2022-11-20 20:17:09,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:09,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:09,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:17:09,346 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:17:09,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 20:17:09,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:09,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 20:17:09,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:17:09,571 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-20 20:17:09,572 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:17:09,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648027603] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:17:09,572 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:17:09,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-20 20:17:09,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570849887] [2022-11-20 20:17:09,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:17:09,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:17:09,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:09,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:17:09,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:17:09,574 INFO L87 Difference]: Start difference. First operand 3015 states and 4353 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) [2022-11-20 20:17:10,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:10,184 INFO L93 Difference]: Finished difference Result 7564 states and 11646 transitions. [2022-11-20 20:17:10,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:17:10,185 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 102 [2022-11-20 20:17:10,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:10,214 INFO L225 Difference]: With dead ends: 7564 [2022-11-20 20:17:10,214 INFO L226 Difference]: Without dead ends: 5259 [2022-11-20 20:17:10,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:17:10,227 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 254 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:10,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 414 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:17:10,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5259 states. [2022-11-20 20:17:10,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5259 to 5235. [2022-11-20 20:17:10,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5235 states, 4203 states have (on average 1.4365929098263146) internal successors, (6038), 4231 states have internal predecessors, (6038), 701 states have call successors, (701), 331 states have call predecessors, (701), 329 states have return successors, (986), 674 states have call predecessors, (986), 698 states have call successors, (986) [2022-11-20 20:17:10,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5235 states to 5235 states and 7725 transitions. [2022-11-20 20:17:10,955 INFO L78 Accepts]: Start accepts. Automaton has 5235 states and 7725 transitions. Word has length 102 [2022-11-20 20:17:10,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:10,955 INFO L495 AbstractCegarLoop]: Abstraction has 5235 states and 7725 transitions. [2022-11-20 20:17:10,956 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) [2022-11-20 20:17:10,956 INFO L276 IsEmpty]: Start isEmpty. Operand 5235 states and 7725 transitions. [2022-11-20 20:17:10,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-11-20 20:17:10,965 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:10,965 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:17:10,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 20:17:11,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-20 20:17:11,172 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:11,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:11,173 INFO L85 PathProgramCache]: Analyzing trace with hash -366547104, now seen corresponding path program 1 times [2022-11-20 20:17:11,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:11,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348331803] [2022-11-20 20:17:11,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:11,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:11,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:11,279 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-20 20:17:11,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:11,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348331803] [2022-11-20 20:17:11,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [348331803] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:17:11,280 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:17:11,280 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:17:11,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525182745] [2022-11-20 20:17:11,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:17:11,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:17:11,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:11,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:17:11,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:17:11,283 INFO L87 Difference]: Start difference. First operand 5235 states and 7725 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:17:12,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:12,131 INFO L93 Difference]: Finished difference Result 9895 states and 15188 transitions. [2022-11-20 20:17:12,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:17:12,132 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 102 [2022-11-20 20:17:12,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:12,166 INFO L225 Difference]: With dead ends: 9895 [2022-11-20 20:17:12,166 INFO L226 Difference]: Without dead ends: 6259 [2022-11-20 20:17:12,179 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 [2022-11-20 20:17:12,180 INFO L413 NwaCegarLoop]: 327 mSDtfsCounter, 83 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 575 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:12,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 575 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:17:12,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6259 states. [2022-11-20 20:17:12,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6259 to 5875. [2022-11-20 20:17:12,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5875 states, 4811 states have (on average 1.472874662232384) internal successors, (7086), 4839 states have internal predecessors, (7086), 717 states have call successors, (717), 347 states have call predecessors, (717), 345 states have return successors, (1002), 690 states have call predecessors, (1002), 714 states have call successors, (1002) [2022-11-20 20:17:12,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5875 states to 5875 states and 8805 transitions. [2022-11-20 20:17:12,765 INFO L78 Accepts]: Start accepts. Automaton has 5875 states and 8805 transitions. Word has length 102 [2022-11-20 20:17:12,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:12,765 INFO L495 AbstractCegarLoop]: Abstraction has 5875 states and 8805 transitions. [2022-11-20 20:17:12,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-20 20:17:12,766 INFO L276 IsEmpty]: Start isEmpty. Operand 5875 states and 8805 transitions. [2022-11-20 20:17:12,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-11-20 20:17:12,775 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:12,775 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:17:12,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-11-20 20:17:12,775 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:12,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:12,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1697558894, now seen corresponding path program 1 times [2022-11-20 20:17:12,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:12,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530074666] [2022-11-20 20:17:12,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:12,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:12,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:12,965 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 8 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-20 20:17:12,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:12,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530074666] [2022-11-20 20:17:12,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530074666] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:17:12,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826968999] [2022-11-20 20:17:12,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:12,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:12,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:17:12,971 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:17:12,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 20:17:13,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:13,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:17:13,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:17:13,205 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 20:17:13,205 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:17:13,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [826968999] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:17:13,205 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:17:13,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2022-11-20 20:17:13,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410523577] [2022-11-20 20:17:13,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:17:13,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 20:17:13,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:13,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 20:17:13,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:17:13,207 INFO L87 Difference]: Start difference. First operand 5875 states and 8805 transitions. Second operand has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2022-11-20 20:17:14,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:14,019 INFO L93 Difference]: Finished difference Result 6424 states and 9430 transitions. [2022-11-20 20:17:14,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-20 20:17:14,020 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 112 [2022-11-20 20:17:14,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:14,043 INFO L225 Difference]: With dead ends: 6424 [2022-11-20 20:17:14,043 INFO L226 Difference]: Without dead ends: 5831 [2022-11-20 20:17:14,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2022-11-20 20:17:14,048 INFO L413 NwaCegarLoop]: 288 mSDtfsCounter, 67 mSDsluCounter, 1063 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 1351 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:14,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 1351 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:17:14,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5831 states. [2022-11-20 20:17:14,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5831 to 5739. [2022-11-20 20:17:14,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5739 states, 4711 states have (on average 1.4793037571640841) internal successors, (6969), 4739 states have internal predecessors, (6969), 698 states have call successors, (698), 330 states have call predecessors, (698), 328 states have return successors, (983), 671 states have call predecessors, (983), 695 states have call successors, (983) [2022-11-20 20:17:14,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5739 states to 5739 states and 8650 transitions. [2022-11-20 20:17:14,713 INFO L78 Accepts]: Start accepts. Automaton has 5739 states and 8650 transitions. Word has length 112 [2022-11-20 20:17:14,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:14,713 INFO L495 AbstractCegarLoop]: Abstraction has 5739 states and 8650 transitions. [2022-11-20 20:17:14,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2022-11-20 20:17:14,714 INFO L276 IsEmpty]: Start isEmpty. Operand 5739 states and 8650 transitions. [2022-11-20 20:17:14,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-11-20 20:17:14,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:14,723 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:17:14,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-20 20:17:14,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:14,929 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:14,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:14,930 INFO L85 PathProgramCache]: Analyzing trace with hash -302091448, now seen corresponding path program 1 times [2022-11-20 20:17:14,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:14,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929248182] [2022-11-20 20:17:14,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:14,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:14,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:15,100 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-11-20 20:17:15,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:15,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929248182] [2022-11-20 20:17:15,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929248182] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:17:15,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289868521] [2022-11-20 20:17:15,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:15,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:15,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:17:15,102 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:17:15,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-20 20:17:15,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:15,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:17:15,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:17:15,319 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-20 20:17:15,320 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:17:15,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289868521] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:17:15,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:17:15,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2022-11-20 20:17:15,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564645752] [2022-11-20 20:17:15,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:17:15,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-20 20:17:15,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:17:15,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-20 20:17:15,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-11-20 20:17:15,322 INFO L87 Difference]: Start difference. First operand 5739 states and 8650 transitions. Second operand has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2022-11-20 20:17:16,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:17:16,387 INFO L93 Difference]: Finished difference Result 6488 states and 9495 transitions. [2022-11-20 20:17:16,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-20 20:17:16,387 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) Word has length 113 [2022-11-20 20:17:16,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:17:16,409 INFO L225 Difference]: With dead ends: 6488 [2022-11-20 20:17:16,410 INFO L226 Difference]: Without dead ends: 6031 [2022-11-20 20:17:16,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2022-11-20 20:17:16,414 INFO L413 NwaCegarLoop]: 280 mSDtfsCounter, 247 mSDsluCounter, 898 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 1178 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:17:16,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 1178 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:17:16,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6031 states. [2022-11-20 20:17:17,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6031 to 5997. [2022-11-20 20:17:17,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5997 states, 4873 states have (on average 1.467063410630002) internal successors, (7149), 4907 states have internal predecessors, (7149), 746 states have call successors, (746), 372 states have call predecessors, (746), 376 states have return successors, (1043), 719 states have call predecessors, (1043), 743 states have call successors, (1043) [2022-11-20 20:17:17,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5997 states to 5997 states and 8938 transitions. [2022-11-20 20:17:17,151 INFO L78 Accepts]: Start accepts. Automaton has 5997 states and 8938 transitions. Word has length 113 [2022-11-20 20:17:17,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:17:17,152 INFO L495 AbstractCegarLoop]: Abstraction has 5997 states and 8938 transitions. [2022-11-20 20:17:17,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2022-11-20 20:17:17,152 INFO L276 IsEmpty]: Start isEmpty. Operand 5997 states and 8938 transitions. [2022-11-20 20:17:17,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-20 20:17:17,162 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:17:17,162 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:17:17,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-20 20:17:17,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:17,368 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:17:17,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:17:17,369 INFO L85 PathProgramCache]: Analyzing trace with hash 1690836433, now seen corresponding path program 1 times [2022-11-20 20:17:17,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:17:17,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174833474] [2022-11-20 20:17:17,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:17,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:17:17,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:18,289 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-20 20:17:18,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:17:18,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174833474] [2022-11-20 20:17:18,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174833474] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:17:18,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431484690] [2022-11-20 20:17:18,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:17:18,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:17:18,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:17:18,295 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:17:18,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-20 20:17:18,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:17:18,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 59 conjunts are in the unsatisfiable core [2022-11-20 20:17:18,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:17:19,429 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 31 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:17:19,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:17:21,335 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-20 20:17:21,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431484690] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:17:21,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [452172046] [2022-11-20 20:17:21,343 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2022-11-20 20:17:21,344 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:17:21,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:17:21,345 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:17:21,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:18:08,190 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 272 for LOIs [2022-11-20 20:18:08,666 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 223 for LOIs [2022-11-20 20:18:08,729 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 214 for LOIs [2022-11-20 20:18:08,793 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 284 for LOIs [2022-11-20 20:18:10,922 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 162 for LOIs [2022-11-20 20:18:11,218 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 108 for LOIs [2022-11-20 20:18:11,489 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 276 for LOIs [2022-11-20 20:18:12,000 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 299 for LOIs [2022-11-20 20:18:12,471 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:19:15,839 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '142370#(and (= ~q_req_up~0 1) (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~t7_i~0 0) (= ~t1_pc~0 0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (<= 0 ~c_dr_pc~0) (<= 0 ~p_dw_st~0) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (<= 0 ~p_dw_pc~0) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (<= ~c_dr_pc~0 1) (= 1 ~c_dr_i~0) (<= ~p_dw_st~0 2) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t6_st~0) (= ~t4_i~0 0) (= ~T7_E~0 2) (<= 2 ~E_6~0) (= ~m_i~0 0) (<= ~t2_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= ~E_4~0 2) (<= 2 ~E_7~0) (= ~E_2~0 2) (<= ~E_6~0 2) (<= 0 ~t2_i~0) (<= ~t3_st~0 0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~token~0 0) (<= 0 ~t3_st~0) (<= ~m_pc~0 0) (<= 2 ~E_4~0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (<= ~E_5~0 2) (<= ~m_st~0 0) (<= ~t3_pc~0 0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (<= 0 ~m_pc~0) (= ~E_M~0 2) (<= 0 ~t3_pc~0) (= 0 ~t2_st~0) (<= 2 ~E_5~0) (<= 1 ~c_num_read~0) (<= 0 ~m_st~0) (<= ~t4_pc~0 0) (= ~E_1~0 2) (<= 0 ~t4_pc~0) (= ~M_E~0 2) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (= ~c_dr_st~0 1) (<= 0 ~t1_st~0) (<= ~E_7~0 2) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2022-11-20 20:19:15,839 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:19:15,839 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:19:15,839 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 16] total 51 [2022-11-20 20:19:15,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956832185] [2022-11-20 20:19:15,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:19:15,840 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-20 20:19:15,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:19:15,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-20 20:19:15,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=10774, Unknown=0, NotChecked=0, Total=11556 [2022-11-20 20:19:15,845 INFO L87 Difference]: Start difference. First operand 5997 states and 8938 transitions. Second operand has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) [2022-11-20 20:19:39,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:19:39,668 INFO L93 Difference]: Finished difference Result 8508 states and 11854 transitions. [2022-11-20 20:19:39,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 229 states. [2022-11-20 20:19:39,668 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) Word has length 114 [2022-11-20 20:19:39,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:19:39,693 INFO L225 Difference]: With dead ends: 8508 [2022-11-20 20:19:39,693 INFO L226 Difference]: Without dead ends: 7793 [2022-11-20 20:19:39,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 622 GetRequests, 288 SyntacticMatches, 4 SemanticMatches, 330 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44667 ImplicationChecksByTransitivity, 81.7s TimeCoverageRelationStatistics Valid=10069, Invalid=99823, Unknown=0, NotChecked=0, Total=109892 [2022-11-20 20:19:39,713 INFO L413 NwaCegarLoop]: 221 mSDtfsCounter, 5482 mSDsluCounter, 2576 mSDsCounter, 0 mSdLazyCounter, 6866 mSolverCounterSat, 2925 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5484 SdHoareTripleChecker+Valid, 2797 SdHoareTripleChecker+Invalid, 9791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2925 IncrementalHoareTripleChecker+Valid, 6866 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:19:39,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5484 Valid, 2797 Invalid, 9791 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2925 Valid, 6866 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2022-11-20 20:19:39,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7793 states. [2022-11-20 20:19:40,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7793 to 6273. [2022-11-20 20:19:40,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6273 states, 5057 states have (on average 1.4554083448684991) internal successors, (7360), 5093 states have internal predecessors, (7360), 791 states have call successors, (791), 409 states have call predecessors, (791), 423 states have return successors, (1100), 772 states have call predecessors, (1100), 788 states have call successors, (1100) [2022-11-20 20:19:40,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6273 states to 6273 states and 9251 transitions. [2022-11-20 20:19:40,476 INFO L78 Accepts]: Start accepts. Automaton has 6273 states and 9251 transitions. Word has length 114 [2022-11-20 20:19:40,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:19:40,477 INFO L495 AbstractCegarLoop]: Abstraction has 6273 states and 9251 transitions. [2022-11-20 20:19:40,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 33 states have (on average 5.909090909090909) internal successors, (195), 38 states have internal predecessors, (195), 19 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 19 states have call predecessors, (46), 19 states have call successors, (46) [2022-11-20 20:19:40,477 INFO L276 IsEmpty]: Start isEmpty. Operand 6273 states and 9251 transitions. [2022-11-20 20:19:40,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-11-20 20:19:40,488 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:19:40,488 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:19:40,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-20 20:19:40,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:19:40,695 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:19:40,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:19:40,699 INFO L85 PathProgramCache]: Analyzing trace with hash 1341904863, now seen corresponding path program 1 times [2022-11-20 20:19:40,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:19:40,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026350891] [2022-11-20 20:19:40,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:19:40,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:19:40,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:19:41,061 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 23 proven. 11 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-20 20:19:41,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:19:41,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026350891] [2022-11-20 20:19:41,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026350891] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:19:41,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170820747] [2022-11-20 20:19:41,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:19:41,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:19:41,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:19:41,063 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:19:41,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-20 20:19:41,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:19:41,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-20 20:19:41,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:19:41,305 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-20 20:19:41,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:19:41,616 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-20 20:19:41,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170820747] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-20 20:19:41,617 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:19:41,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14, 8] total 20 [2022-11-20 20:19:41,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936446951] [2022-11-20 20:19:41,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:19:41,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 20:19:41,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:19:41,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 20:19:41,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2022-11-20 20:19:41,618 INFO L87 Difference]: Start difference. First operand 6273 states and 9251 transitions. Second operand has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2022-11-20 20:19:43,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:19:43,191 INFO L93 Difference]: Finished difference Result 7597 states and 10799 transitions. [2022-11-20 20:19:43,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-20 20:19:43,194 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 115 [2022-11-20 20:19:43,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:19:43,217 INFO L225 Difference]: With dead ends: 7597 [2022-11-20 20:19:43,218 INFO L226 Difference]: Without dead ends: 6606 [2022-11-20 20:19:43,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=98, Invalid=552, Unknown=0, NotChecked=0, Total=650 [2022-11-20 20:19:43,224 INFO L413 NwaCegarLoop]: 227 mSDtfsCounter, 390 mSDsluCounter, 537 mSDsCounter, 0 mSdLazyCounter, 880 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 764 SdHoareTripleChecker+Invalid, 975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 880 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:19:43,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [394 Valid, 764 Invalid, 975 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 880 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 20:19:43,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6606 states. [2022-11-20 20:19:44,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6606 to 6353. [2022-11-20 20:19:44,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6353 states, 5102 states have (on average 1.4525676205409643) internal successors, (7411), 5141 states have internal predecessors, (7411), 810 states have call successors, (810), 418 states have call predecessors, (810), 439 states have return successors, (1140), 795 states have call predecessors, (1140), 807 states have call successors, (1140) [2022-11-20 20:19:44,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6353 states to 6353 states and 9361 transitions. [2022-11-20 20:19:44,087 INFO L78 Accepts]: Start accepts. Automaton has 6353 states and 9361 transitions. Word has length 115 [2022-11-20 20:19:44,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:19:44,087 INFO L495 AbstractCegarLoop]: Abstraction has 6353 states and 9361 transitions. [2022-11-20 20:19:44,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2022-11-20 20:19:44,087 INFO L276 IsEmpty]: Start isEmpty. Operand 6353 states and 9361 transitions. [2022-11-20 20:19:44,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-20 20:19:44,098 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:19:44,099 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:19:44,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-20 20:19:44,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-20 20:19:44,306 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:19:44,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:19:44,306 INFO L85 PathProgramCache]: Analyzing trace with hash -1684999008, now seen corresponding path program 1 times [2022-11-20 20:19:44,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:19:44,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204916823] [2022-11-20 20:19:44,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:19:44,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:19:44,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:19:45,242 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 30 proven. 27 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-20 20:19:45,242 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:19:45,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204916823] [2022-11-20 20:19:45,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204916823] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:19:45,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019446420] [2022-11-20 20:19:45,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:19:45,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:19:45,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:19:45,244 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:19:45,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-20 20:19:45,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:19:45,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-20 20:19:45,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:19:46,386 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 60 proven. 23 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:19:46,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:19:48,237 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-20 20:19:48,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019446420] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:19:48,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1857046760] [2022-11-20 20:19:48,240 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2022-11-20 20:19:48,240 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:19:48,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:19:48,241 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:19:48,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:19:59,701 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 272 for LOIs [2022-11-20 20:20:00,341 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 222 for LOIs [2022-11-20 20:20:00,399 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 110 for LOIs [2022-11-20 20:20:00,412 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 284 for LOIs [2022-11-20 20:20:02,447 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 162 for LOIs [2022-11-20 20:20:02,708 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 110 for LOIs [2022-11-20 20:20:02,933 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 276 for LOIs [2022-11-20 20:20:03,616 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 299 for LOIs [2022-11-20 20:20:04,076 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:21:06,514 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '185476#(and (= ~q_req_up~0 1) (or (and (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~t7_i~0 0) (= ~t1_pc~0 0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (= ~E_7~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t6_st~0) (= ~t2_i~0 0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~T7_E~0 2) (= ~m_i~0 0) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~token~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~E_M~0 2) (= 0 ~t2_st~0) (= ~E_1~0 2) (= ~M_E~0 2) (= ~t1_i~0 0) (= |#NULL.base| 0)) (and (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~t7_i~0 0) (= ~t1_pc~0 0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (= ~E_7~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t6_st~0) (= ~t2_i~0 0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~T7_E~0 2) (= ~m_i~0 0) (= ~p_dw_pc~0 1) (= ~E_2~0 2) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~token~0 0) (= 2 ~p_dw_st~0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~E_M~0 2) (= 0 ~t2_st~0) (= ~E_1~0 2) (= ~M_E~0 2) (= ~t1_i~0 0) (= |#NULL.base| 0))) (<= 0 ~p_dw_pc~0) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~c_dr_pc~0 1) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~c_last_read~0 ~q_buf_0~0) (<= ~t3_st~0 0) (<= ~c_num_read~0 1) (<= 0 ~t3_st~0) (<= ~m_pc~0 0) (<= ~E_5~0 2) (<= ~m_st~0 0) (<= ~t3_pc~0 0) (= ~c_last_read~0 ~p_last_write~0) (<= 0 ~m_pc~0) (<= 0 ~t3_pc~0) (<= 2 ~E_5~0) (<= 1 ~c_num_read~0) (<= 0 ~m_st~0) (<= ~t4_pc~0 0) (<= 0 ~t4_pc~0) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (= ~c_dr_st~0 1) (<= 0 ~t1_st~0))' at error location [2022-11-20 20:21:06,514 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:21:06,514 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 20:21:06,514 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18, 18] total 55 [2022-11-20 20:21:06,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482032966] [2022-11-20 20:21:06,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 20:21:06,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-20 20:21:06,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:21:06,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-20 20:21:06,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=953, Invalid=11703, Unknown=0, NotChecked=0, Total=12656 [2022-11-20 20:21:06,518 INFO L87 Difference]: Start difference. First operand 6353 states and 9361 transitions. Second operand has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) [2022-11-20 20:21:24,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:21:24,630 INFO L93 Difference]: Finished difference Result 8637 states and 12063 transitions. [2022-11-20 20:21:24,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2022-11-20 20:21:24,630 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) Word has length 124 [2022-11-20 20:21:24,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:21:24,653 INFO L225 Difference]: With dead ends: 8637 [2022-11-20 20:21:24,653 INFO L226 Difference]: Without dead ends: 7566 [2022-11-20 20:21:24,661 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 321 SyntacticMatches, 1 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26840 ImplicationChecksByTransitivity, 74.0s TimeCoverageRelationStatistics Valid=6751, Invalid=62681, Unknown=0, NotChecked=0, Total=69432 [2022-11-20 20:21:24,662 INFO L413 NwaCegarLoop]: 214 mSDtfsCounter, 7512 mSDsluCounter, 2289 mSDsCounter, 0 mSdLazyCounter, 6961 mSolverCounterSat, 4926 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7512 SdHoareTripleChecker+Valid, 2503 SdHoareTripleChecker+Invalid, 11887 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4926 IncrementalHoareTripleChecker+Valid, 6961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-11-20 20:21:24,662 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7512 Valid, 2503 Invalid, 11887 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4926 Valid, 6961 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-11-20 20:21:24,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7566 states. [2022-11-20 20:21:25,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7566 to 6169. [2022-11-20 20:21:25,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6169 states, 4990 states have (on average 1.4595190380761522) internal successors, (7283), 5028 states have internal predecessors, (7283), 770 states have call successors, (770), 386 states have call predecessors, (770), 407 states have return successors, (1090), 756 states have call predecessors, (1090), 767 states have call successors, (1090) [2022-11-20 20:21:25,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6169 states to 6169 states and 9143 transitions. [2022-11-20 20:21:25,615 INFO L78 Accepts]: Start accepts. Automaton has 6169 states and 9143 transitions. Word has length 124 [2022-11-20 20:21:25,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:21:25,616 INFO L495 AbstractCegarLoop]: Abstraction has 6169 states and 9143 transitions. [2022-11-20 20:21:25,616 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 36 states have (on average 5.944444444444445) internal successors, (214), 40 states have internal predecessors, (214), 25 states have call successors, (49), 17 states have call predecessors, (49), 22 states have return successors, (51), 24 states have call predecessors, (51), 25 states have call successors, (51) [2022-11-20 20:21:25,616 INFO L276 IsEmpty]: Start isEmpty. Operand 6169 states and 9143 transitions. [2022-11-20 20:21:25,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-20 20:21:25,626 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:21:25,627 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:21:25,635 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-20 20:21:25,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:21:25,833 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:21:25,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:21:25,833 INFO L85 PathProgramCache]: Analyzing trace with hash -1807136308, now seen corresponding path program 1 times [2022-11-20 20:21:25,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:21:25,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905809123] [2022-11-20 20:21:25,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:21:25,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:21:25,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:21:26,027 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 38 proven. 9 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-20 20:21:26,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:21:26,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905809123] [2022-11-20 20:21:26,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905809123] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:21:26,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347852303] [2022-11-20 20:21:26,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:21:26,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:21:26,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:21:26,029 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:21:26,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-20 20:21:26,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:21:26,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:21:26,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:21:26,306 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 50 proven. 17 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-20 20:21:26,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:21:26,536 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-20 20:21:26,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347852303] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-20 20:21:26,536 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:21:26,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 10] total 17 [2022-11-20 20:21:26,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235912811] [2022-11-20 20:21:26,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:21:26,537 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 20:21:26,537 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:21:26,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 20:21:26,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2022-11-20 20:21:26,538 INFO L87 Difference]: Start difference. First operand 6169 states and 9143 transitions. Second operand has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2022-11-20 20:21:28,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:21:28,118 INFO L93 Difference]: Finished difference Result 6824 states and 9884 transitions. [2022-11-20 20:21:28,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 20:21:28,118 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 125 [2022-11-20 20:21:28,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:21:28,138 INFO L225 Difference]: With dead ends: 6824 [2022-11-20 20:21:28,139 INFO L226 Difference]: Without dead ends: 5937 [2022-11-20 20:21:28,143 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2022-11-20 20:21:28,144 INFO L413 NwaCegarLoop]: 212 mSDtfsCounter, 622 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 851 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 601 SdHoareTripleChecker+Invalid, 1017 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 851 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:21:28,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [624 Valid, 601 Invalid, 1017 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 851 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 20:21:28,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5937 states. [2022-11-20 20:21:29,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5937 to 5900. [2022-11-20 20:21:29,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5900 states, 4791 states have (on average 1.4690043832185347) internal successors, (7038), 4829 states have internal predecessors, (7038), 734 states have call successors, (734), 356 states have call predecessors, (734), 373 states have return successors, (1049), 716 states have call predecessors, (1049), 731 states have call successors, (1049) [2022-11-20 20:21:29,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5900 states to 5900 states and 8821 transitions. [2022-11-20 20:21:29,160 INFO L78 Accepts]: Start accepts. Automaton has 5900 states and 8821 transitions. Word has length 125 [2022-11-20 20:21:29,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:21:29,160 INFO L495 AbstractCegarLoop]: Abstraction has 5900 states and 8821 transitions. [2022-11-20 20:21:29,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2022-11-20 20:21:29,161 INFO L276 IsEmpty]: Start isEmpty. Operand 5900 states and 8821 transitions. [2022-11-20 20:21:29,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-20 20:21:29,174 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:21:29,174 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, 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] [2022-11-20 20:21:29,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-20 20:21:29,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-20 20:21:29,380 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:21:29,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:21:29,381 INFO L85 PathProgramCache]: Analyzing trace with hash -550691214, now seen corresponding path program 1 times [2022-11-20 20:21:29,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:21:29,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607039534] [2022-11-20 20:21:29,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:21:29,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:21:29,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:21:29,452 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-11-20 20:21:29,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:21:29,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607039534] [2022-11-20 20:21:29,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607039534] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:21:29,454 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:21:29,455 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:21:29,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691079351] [2022-11-20 20:21:29,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:21:29,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:21:29,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:21:29,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:21:29,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:21:29,456 INFO L87 Difference]: Start difference. First operand 5900 states and 8821 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-20 20:21:30,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:21:30,875 INFO L93 Difference]: Finished difference Result 16053 states and 25058 transitions. [2022-11-20 20:21:30,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:21:30,875 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 137 [2022-11-20 20:21:30,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:21:30,905 INFO L225 Difference]: With dead ends: 16053 [2022-11-20 20:21:30,905 INFO L226 Difference]: Without dead ends: 10888 [2022-11-20 20:21:30,921 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 [2022-11-20 20:21:30,922 INFO L413 NwaCegarLoop]: 258 mSDtfsCounter, 254 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 416 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:21:30,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 416 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:21:30,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10888 states. [2022-11-20 20:21:32,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10888 to 10828. [2022-11-20 20:21:32,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10828 states, 8891 states have (on average 1.4781239455629287) internal successors, (13142), 8953 states have internal predecessors, (13142), 1306 states have call successors, (1306), 612 states have call predecessors, (1306), 629 states have return successors, (1877), 1264 states have call predecessors, (1877), 1303 states have call successors, (1877) [2022-11-20 20:21:32,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10828 states to 10828 states and 16325 transitions. [2022-11-20 20:21:32,353 INFO L78 Accepts]: Start accepts. Automaton has 10828 states and 16325 transitions. Word has length 137 [2022-11-20 20:21:32,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:21:32,353 INFO L495 AbstractCegarLoop]: Abstraction has 10828 states and 16325 transitions. [2022-11-20 20:21:32,353 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-20 20:21:32,354 INFO L276 IsEmpty]: Start isEmpty. Operand 10828 states and 16325 transitions. [2022-11-20 20:21:32,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-20 20:21:32,377 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:21:32,377 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, 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] [2022-11-20 20:21:32,378 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-11-20 20:21:32,378 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:21:32,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:21:32,378 INFO L85 PathProgramCache]: Analyzing trace with hash -1606484099, now seen corresponding path program 1 times [2022-11-20 20:21:32,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:21:32,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20309073] [2022-11-20 20:21:32,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:21:32,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:21:32,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:21:32,445 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-11-20 20:21:32,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:21:32,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20309073] [2022-11-20 20:21:32,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20309073] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:21:32,446 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:21:32,446 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:21:32,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8310401] [2022-11-20 20:21:32,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:21:32,447 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:21:32,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:21:32,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:21:32,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:21:32,447 INFO L87 Difference]: Start difference. First operand 10828 states and 16325 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-20 20:21:34,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:21:34,858 INFO L93 Difference]: Finished difference Result 30661 states and 47726 transitions. [2022-11-20 20:21:34,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:21:34,858 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 137 [2022-11-20 20:21:34,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:21:34,905 INFO L225 Difference]: With dead ends: 30661 [2022-11-20 20:21:34,905 INFO L226 Difference]: Without dead ends: 20568 [2022-11-20 20:21:34,928 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 [2022-11-20 20:21:34,928 INFO L413 NwaCegarLoop]: 258 mSDtfsCounter, 256 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 416 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:21:34,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 416 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:21:34,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20568 states. [2022-11-20 20:21:37,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20568 to 20452. [2022-11-20 20:21:37,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20452 states, 16899 states have (on average 1.4773655245872537) internal successors, (24966), 17009 states have internal predecessors, (24966), 2410 states have call successors, (2410), 1124 states have call predecessors, (2410), 1141 states have return successors, (3461), 2320 states have call predecessors, (3461), 2407 states have call successors, (3461) [2022-11-20 20:21:37,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20452 states to 20452 states and 30837 transitions. [2022-11-20 20:21:37,550 INFO L78 Accepts]: Start accepts. Automaton has 20452 states and 30837 transitions. Word has length 137 [2022-11-20 20:21:37,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:21:37,550 INFO L495 AbstractCegarLoop]: Abstraction has 20452 states and 30837 transitions. [2022-11-20 20:21:37,550 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-20 20:21:37,550 INFO L276 IsEmpty]: Start isEmpty. Operand 20452 states and 30837 transitions. [2022-11-20 20:21:37,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-20 20:21:37,577 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:21:37,577 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, 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] [2022-11-20 20:21:37,577 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-11-20 20:21:37,578 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:21:37,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:21:37,578 INFO L85 PathProgramCache]: Analyzing trace with hash -1297830452, now seen corresponding path program 1 times [2022-11-20 20:21:37,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:21:37,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734573705] [2022-11-20 20:21:37,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:21:37,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:21:37,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:21:37,646 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-11-20 20:21:37,646 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:21:37,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734573705] [2022-11-20 20:21:37,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734573705] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:21:37,646 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:21:37,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:21:37,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553907594] [2022-11-20 20:21:37,647 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:21:37,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:21:37,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:21:37,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:21:37,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:21:37,648 INFO L87 Difference]: Start difference. First operand 20452 states and 30837 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-20 20:21:42,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:21:42,516 INFO L93 Difference]: Finished difference Result 59181 states and 91502 transitions. [2022-11-20 20:21:42,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:21:42,517 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 137 [2022-11-20 20:21:42,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:21:42,609 INFO L225 Difference]: With dead ends: 59181 [2022-11-20 20:21:42,609 INFO L226 Difference]: Without dead ends: 39464 [2022-11-20 20:21:42,670 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 [2022-11-20 20:21:42,671 INFO L413 NwaCegarLoop]: 266 mSDtfsCounter, 259 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:21:42,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 424 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:21:42,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39464 states. [2022-11-20 20:21:48,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39464 to 39236. [2022-11-20 20:21:48,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39236 states, 32531 states have (on average 1.4707817159017553) internal successors, (47846), 32737 states have internal predecessors, (47846), 4538 states have call successors, (4538), 2148 states have call predecessors, (4538), 2165 states have return successors, (6485), 4352 states have call predecessors, (6485), 4535 states have call successors, (6485) [2022-11-20 20:21:48,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39236 states to 39236 states and 58869 transitions. [2022-11-20 20:21:48,596 INFO L78 Accepts]: Start accepts. Automaton has 39236 states and 58869 transitions. Word has length 137 [2022-11-20 20:21:48,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:21:48,597 INFO L495 AbstractCegarLoop]: Abstraction has 39236 states and 58869 transitions. [2022-11-20 20:21:48,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-20 20:21:48,597 INFO L276 IsEmpty]: Start isEmpty. Operand 39236 states and 58869 transitions. [2022-11-20 20:21:48,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-11-20 20:21:48,690 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:21:48,690 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, 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, 1, 1] [2022-11-20 20:21:48,690 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-11-20 20:21:48,690 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:21:48,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:21:48,691 INFO L85 PathProgramCache]: Analyzing trace with hash 1250704897, now seen corresponding path program 1 times [2022-11-20 20:21:48,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:21:48,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377973054] [2022-11-20 20:21:48,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:21:48,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:21:48,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:21:48,958 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 10 proven. 50 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-20 20:21:48,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:21:48,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377973054] [2022-11-20 20:21:48,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377973054] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:21:48,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272867019] [2022-11-20 20:21:48,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:21:48,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:21:48,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:21:48,960 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:21:48,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_acb8ce2c-1838-4bc1-a317-b5fda43fde6d/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-20 20:21:49,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:21:49,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 918 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 20:21:49,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:21:49,225 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-20 20:21:49,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:21:49,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272867019] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:21:49,225 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:21:49,226 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-20 20:21:49,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585025439] [2022-11-20 20:21:49,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:21:49,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:21:49,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:21:49,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:21:49,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:21:49,228 INFO L87 Difference]: Start difference. First operand 39236 states and 58869 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-20 20:21:55,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:21:55,245 INFO L93 Difference]: Finished difference Result 72449 states and 108460 transitions. [2022-11-20 20:21:55,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:21:55,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 157 [2022-11-20 20:21:55,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:21:55,370 INFO L225 Difference]: With dead ends: 72449 [2022-11-20 20:21:55,371 INFO L226 Difference]: Without dead ends: 49725 [2022-11-20 20:21:55,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-20 20:21:55,539 INFO L413 NwaCegarLoop]: 266 mSDtfsCounter, 261 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:21:55,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 310 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:21:55,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49725 states.