./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_valuebound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ec2a850a3cd9252437037b0e2bf289d9622078bb11b0dcb40fb1cb3d7147f7c5 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-5e519f3 [2022-11-03 02:30:39,903 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:30:39,906 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:30:39,967 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:30:39,968 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:30:39,972 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:30:39,975 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:30:39,982 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:30:39,984 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:30:39,991 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:30:39,992 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:30:39,995 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:30:39,995 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:30:39,998 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:30:40,000 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:30:40,003 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:30:40,005 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:30:40,006 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:30:40,008 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:30:40,016 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:30:40,018 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:30:40,020 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:30:40,024 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:30:40,025 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:30:40,035 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:30:40,035 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:30:40,036 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:30:40,038 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:30:40,039 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:30:40,040 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:30:40,040 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:30:40,043 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:30:40,045 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:30:40,047 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:30:40,048 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:30:40,048 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:30:40,049 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:30:40,050 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:30:40,050 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:30:40,051 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:30:40,052 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:30:40,053 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:30:40,098 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:30:40,099 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:30:40,100 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:30:40,100 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:30:40,101 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:30:40,102 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:30:40,102 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:30:40,102 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:30:40,103 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:30:40,103 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:30:40,105 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:30:40,105 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:30:40,105 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:30:40,106 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:30:40,106 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:30:40,107 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:30:40,107 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:30:40,107 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:30:40,108 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:30:40,109 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:30:40,109 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:30:40,109 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:30:40,110 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:30:40,110 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:30:40,110 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:30:40,111 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:30:40,111 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:30:40,112 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:30:40,112 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:30:40,112 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:30:40,113 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:30:40,113 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:30:40,114 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:30:40,114 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:30:40,114 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:30:40,115 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:30:40,115 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:30:40,115 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:30:40,116 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:30:40,116 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:30:40,116 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:30:40,117 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_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ec2a850a3cd9252437037b0e2bf289d9622078bb11b0dcb40fb1cb3d7147f7c5 [2022-11-03 02:30:40,508 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:30:40,541 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:30:40,545 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:30:40,546 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:30:40,548 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:30:40,549 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_valuebound20.c [2022-11-03 02:30:40,629 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/data/c7f98c2a9/c0f092539f324c0198c2825265230f5d/FLAGe963cdf97 [2022-11-03 02:30:41,218 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:30:41,219 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_valuebound20.c [2022-11-03 02:30:41,231 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/data/c7f98c2a9/c0f092539f324c0198c2825265230f5d/FLAGe963cdf97 [2022-11-03 02:30:41,512 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/data/c7f98c2a9/c0f092539f324c0198c2825265230f5d [2022-11-03 02:30:41,515 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:30:41,517 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:30:41,519 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:30:41,519 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:30:41,537 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:30:41,538 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:41,539 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d4b2300 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41, skipping insertion in model container [2022-11-03 02:30:41,540 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:41,549 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:30:41,573 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:30:41,813 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_valuebound20.c[525,538] [2022-11-03 02:30:41,871 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:30:41,884 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:30:41,909 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_valuebound20.c[525,538] [2022-11-03 02:30:41,948 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:30:41,973 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:30:41,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41 WrapperNode [2022-11-03 02:30:41,973 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:30:41,974 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:30:41,974 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:30:41,975 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:30:41,982 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:41,991 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,016 INFO L138 Inliner]: procedures = 14, calls = 18, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 53 [2022-11-03 02:30:42,017 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:30:42,018 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:30:42,018 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:30:42,018 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:30:42,030 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,030 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,033 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,033 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,038 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,042 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,044 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,046 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,048 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:30:42,049 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:30:42,050 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:30:42,050 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:30:42,051 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (1/1) ... [2022-11-03 02:30:42,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:30:42,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:42,087 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:30:42,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:30:42,129 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:30:42,129 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-03 02:30:42,129 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-03 02:30:42,130 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:30:42,130 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:30:42,130 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:30:42,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-03 02:30:42,130 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-03 02:30:42,196 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:30:42,198 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:30:42,429 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:30:42,513 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:30:42,516 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-03 02:30:42,522 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:30:42 BoogieIcfgContainer [2022-11-03 02:30:42,523 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:30:42,525 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:30:42,526 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:30:42,530 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:30:42,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:30:41" (1/3) ... [2022-11-03 02:30:42,532 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ade4ac0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:30:42, skipping insertion in model container [2022-11-03 02:30:42,532 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:30:41" (2/3) ... [2022-11-03 02:30:42,533 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ade4ac0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:30:42, skipping insertion in model container [2022-11-03 02:30:42,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:30:42" (3/3) ... [2022-11-03 02:30:42,535 INFO L112 eAbstractionObserver]: Analyzing ICFG dijkstra-u_valuebound20.c [2022-11-03 02:30:42,559 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:30:42,559 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:30:42,633 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:30:42,643 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;@15a60a28, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:30:42,643 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:30:42,649 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-03 02:30:42,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 02:30:42,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:42,662 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:42,662 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:30:42,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:42,670 INFO L85 PathProgramCache]: Analyzing trace with hash 282219046, now seen corresponding path program 1 times [2022-11-03 02:30:42,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:42,683 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102615298] [2022-11-03 02:30:42,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:42,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:42,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:42,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:42,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102615298] [2022-11-03 02:30:42,880 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-03 02:30:42,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779239367] [2022-11-03 02:30:42,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:42,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:42,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:42,890 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:42,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:30:42,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:42,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-03 02:30:42,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:43,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:30:43,024 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:30:43,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779239367] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:30:43,026 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:30:43,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:30:43,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278851294] [2022-11-03 02:30:43,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:30:43,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-03 02:30:43,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:43,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-03 02:30:43,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:30:43,118 INFO L87 Difference]: Start difference. First operand has 27 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:30:43,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:43,214 INFO L93 Difference]: Finished difference Result 46 states and 78 transitions. [2022-11-03 02:30:43,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-03 02:30:43,217 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-03 02:30:43,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:43,228 INFO L225 Difference]: With dead ends: 46 [2022-11-03 02:30:43,229 INFO L226 Difference]: Without dead ends: 25 [2022-11-03 02:30:43,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:30:43,242 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:43,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:30:43,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-03 02:30:43,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-03 02:30:43,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 02:30:43,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 35 transitions. [2022-11-03 02:30:43,340 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 35 transitions. Word has length 14 [2022-11-03 02:30:43,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:43,343 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 35 transitions. [2022-11-03 02:30:43,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:30:43,344 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 35 transitions. [2022-11-03 02:30:43,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 02:30:43,350 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:43,351 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:43,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:43,566 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:43,567 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:30:43,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:43,568 INFO L85 PathProgramCache]: Analyzing trace with hash 1143065712, now seen corresponding path program 1 times [2022-11-03 02:30:43,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:43,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474224607] [2022-11-03 02:30:43,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:43,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:43,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:44,443 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:30:44,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:44,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474224607] [2022-11-03 02:30:44,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474224607] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:30:44,445 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:30:44,445 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-03 02:30:44,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122131543] [2022-11-03 02:30:44,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:30:44,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 02:30:44,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:44,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 02:30:44,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:30:44,456 INFO L87 Difference]: Start difference. First operand 25 states and 35 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:30:47,055 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:30:49,130 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:30:50,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:50,002 INFO L93 Difference]: Finished difference Result 59 states and 87 transitions. [2022-11-03 02:30:50,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 02:30:50,003 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2022-11-03 02:30:50,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:50,004 INFO L225 Difference]: With dead ends: 59 [2022-11-03 02:30:50,005 INFO L226 Difference]: Without dead ends: 42 [2022-11-03 02:30:50,006 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-03 02:30:50,007 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 10 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 18 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:50,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 121 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 88 Invalid, 2 Unknown, 0 Unchecked, 5.4s Time] [2022-11-03 02:30:50,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-03 02:30:50,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 39. [2022-11-03 02:30:50,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 17 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-03 02:30:50,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 55 transitions. [2022-11-03 02:30:50,030 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 55 transitions. Word has length 15 [2022-11-03 02:30:50,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:50,030 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 55 transitions. [2022-11-03 02:30:50,031 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:30:50,031 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 55 transitions. [2022-11-03 02:30:50,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-03 02:30:50,032 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:50,032 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:50,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 02:30:50,033 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:30:50,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:50,034 INFO L85 PathProgramCache]: Analyzing trace with hash -720172405, now seen corresponding path program 1 times [2022-11-03 02:30:50,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:50,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766279374] [2022-11-03 02:30:50,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:50,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:50,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:50,542 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:30:50,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:50,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766279374] [2022-11-03 02:30:50,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766279374] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:30:50,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162570226] [2022-11-03 02:30:50,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:50,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:50,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:50,550 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:50,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:30:50,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:50,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 02:30:50,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:50,852 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:30:50,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:30:51,152 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:30:51,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162570226] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:30:51,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1044995861] [2022-11-03 02:30:51,180 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-03 02:30:51,181 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:30:51,186 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:30:51,194 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:30:51,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:30:51,687 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-03 02:30:51,745 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-11-03 02:30:51,794 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:30:53,506 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '466#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:30:53,507 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:30:53,507 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:30:53,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2022-11-03 02:30:53,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388527554] [2022-11-03 02:30:53,508 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:30:53,508 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 02:30:53,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:53,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 02:30:53,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2022-11-03 02:30:53,510 INFO L87 Difference]: Start difference. First operand 39 states and 55 transitions. Second operand has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 13 states have internal predecessors, (25), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:30:58,082 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:31:00,246 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:31:01,469 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:31:03,882 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:31:06,051 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:31:08,572 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:31:10,745 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:31:10,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:10,747 INFO L93 Difference]: Finished difference Result 76 states and 112 transitions. [2022-11-03 02:31:10,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:31:10,877 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 13 states have internal predecessors, (25), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-11-03 02:31:10,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:10,879 INFO L225 Difference]: With dead ends: 76 [2022-11-03 02:31:10,879 INFO L226 Difference]: Without dead ends: 65 [2022-11-03 02:31:10,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=110, Invalid=702, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:31:10,882 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 22 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 67 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:10,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 204 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 288 Invalid, 6 Unknown, 0 Unchecked, 17.0s Time] [2022-11-03 02:31:10,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-03 02:31:10,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 56. [2022-11-03 02:31:10,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 29 states have internal predecessors, (31), 25 states have call successors, (25), 4 states have call predecessors, (25), 4 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2022-11-03 02:31:10,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 79 transitions. [2022-11-03 02:31:10,927 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 79 transitions. Word has length 17 [2022-11-03 02:31:10,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:10,928 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 79 transitions. [2022-11-03 02:31:10,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 13 states have internal predecessors, (25), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:31:10,929 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 79 transitions. [2022-11-03 02:31:10,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-03 02:31:10,931 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:10,931 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:10,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:11,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:11,158 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:11,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:11,159 INFO L85 PathProgramCache]: Analyzing trace with hash -1424404976, now seen corresponding path program 1 times [2022-11-03 02:31:11,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:11,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511840754] [2022-11-03 02:31:11,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:11,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:11,171 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:11,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1740099336] [2022-11-03 02:31:11,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:11,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:11,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:11,173 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:11,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:31:11,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:11,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:31:11,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:11,418 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:31:11,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:31:11,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:11,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511840754] [2022-11-03 02:31:11,421 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:11,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740099336] [2022-11-03 02:31:11,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740099336] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:31:11,422 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:31:11,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:31:11,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240446380] [2022-11-03 02:31:11,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:31:11,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:31:11,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:11,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:31:11,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:31:11,432 INFO L87 Difference]: Start difference. First operand 56 states and 79 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-03 02:31:14,053 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:31:14,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:14,147 INFO L93 Difference]: Finished difference Result 66 states and 87 transitions. [2022-11-03 02:31:14,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:31:14,148 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 25 [2022-11-03 02:31:14,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:14,151 INFO L225 Difference]: With dead ends: 66 [2022-11-03 02:31:14,151 INFO L226 Difference]: Without dead ends: 43 [2022-11-03 02:31:14,152 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:31:14,154 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 6 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:14,155 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 102 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 63 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2022-11-03 02:31:14,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-03 02:31:14,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-11-03 02:31:14,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 18 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-03 02:31:14,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 60 transitions. [2022-11-03 02:31:14,181 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 60 transitions. Word has length 25 [2022-11-03 02:31:14,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:14,182 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 60 transitions. [2022-11-03 02:31:14,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-03 02:31:14,182 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 60 transitions. [2022-11-03 02:31:14,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-03 02:31:14,185 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:14,185 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:14,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:14,397 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:14,397 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:14,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:14,398 INFO L85 PathProgramCache]: Analyzing trace with hash -1649199171, now seen corresponding path program 1 times [2022-11-03 02:31:14,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:14,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820066742] [2022-11-03 02:31:14,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:14,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:14,410 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:14,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [694870249] [2022-11-03 02:31:14,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:14,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:14,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:14,413 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:14,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:31:14,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:14,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:31:14,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:14,606 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 02:31:14,606 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:31:14,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:14,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820066742] [2022-11-03 02:31:14,607 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:14,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694870249] [2022-11-03 02:31:14,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [694870249] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:31:14,607 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:31:14,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:31:14,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165571232] [2022-11-03 02:31:14,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:31:14,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:31:14,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:14,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:31:14,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:31:14,609 INFO L87 Difference]: Start difference. First operand 43 states and 60 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 02:31:16,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:16,821 INFO L93 Difference]: Finished difference Result 62 states and 85 transitions. [2022-11-03 02:31:16,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:31:16,822 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2022-11-03 02:31:16,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:16,823 INFO L225 Difference]: With dead ends: 62 [2022-11-03 02:31:16,823 INFO L226 Difference]: Without dead ends: 58 [2022-11-03 02:31:16,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:31:16,826 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 6 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:16,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 96 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-03 02:31:16,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-03 02:31:16,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2022-11-03 02:31:16,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 30 states have internal predecessors, (33), 24 states have call successors, (24), 5 states have call predecessors, (24), 5 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-11-03 02:31:16,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 79 transitions. [2022-11-03 02:31:16,843 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 79 transitions. Word has length 24 [2022-11-03 02:31:16,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:16,844 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 79 transitions. [2022-11-03 02:31:16,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 02:31:16,844 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 79 transitions. [2022-11-03 02:31:16,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-03 02:31:16,845 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:16,846 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:16,895 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-03 02:31:17,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:17,064 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:17,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:17,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1707874709, now seen corresponding path program 1 times [2022-11-03 02:31:17,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:17,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349384002] [2022-11-03 02:31:17,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:17,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:17,078 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:17,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1121181402] [2022-11-03 02:31:17,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:17,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:17,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:17,081 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:17,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:31:17,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:17,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:31:17,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:17,265 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 02:31:17,265 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:31:17,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:17,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349384002] [2022-11-03 02:31:17,266 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:17,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121181402] [2022-11-03 02:31:17,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1121181402] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:31:17,266 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:31:17,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:31:17,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619886464] [2022-11-03 02:31:17,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:31:17,267 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:31:17,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:17,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:31:17,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:31:17,268 INFO L87 Difference]: Start difference. First operand 58 states and 79 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-03 02:31:18,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:18,771 INFO L93 Difference]: Finished difference Result 72 states and 90 transitions. [2022-11-03 02:31:18,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:31:18,772 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2022-11-03 02:31:18,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:18,773 INFO L225 Difference]: With dead ends: 72 [2022-11-03 02:31:18,774 INFO L226 Difference]: Without dead ends: 69 [2022-11-03 02:31:18,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:31:18,775 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 6 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:18,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 109 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-03 02:31:18,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-03 02:31:18,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 51. [2022-11-03 02:31:18,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 28 states have internal predecessors, (30), 17 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-03 02:31:18,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2022-11-03 02:31:18,792 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 27 [2022-11-03 02:31:18,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:18,792 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2022-11-03 02:31:18,793 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-03 02:31:18,793 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2022-11-03 02:31:18,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-03 02:31:18,795 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:18,795 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:18,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:19,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:19,010 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:19,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:19,011 INFO L85 PathProgramCache]: Analyzing trace with hash 54790924, now seen corresponding path program 1 times [2022-11-03 02:31:19,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:19,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306628951] [2022-11-03 02:31:19,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:19,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:19,025 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:19,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1669051009] [2022-11-03 02:31:19,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:19,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:19,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:19,027 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:19,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_be5a254b-0d01-4a6c-a516-cd4ffc6e70ab/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process