./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 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_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba --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 fc71ae13b1bed24e074eb2de07c8f2064aa903343708c3aabf1b928078c9e7f6 --- 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-b5237d8 [2022-11-22 01:53:26,233 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 01:53:26,235 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 01:53:26,257 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 01:53:26,258 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 01:53:26,259 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 01:53:26,260 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 01:53:26,262 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 01:53:26,264 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 01:53:26,265 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 01:53:26,266 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 01:53:26,267 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 01:53:26,268 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 01:53:26,269 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 01:53:26,270 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 01:53:26,271 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 01:53:26,272 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 01:53:26,273 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 01:53:26,275 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 01:53:26,277 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 01:53:26,290 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 01:53:26,292 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 01:53:26,293 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 01:53:26,294 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 01:53:26,298 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 01:53:26,298 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 01:53:26,299 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 01:53:26,305 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 01:53:26,306 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 01:53:26,308 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 01:53:26,309 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 01:53:26,310 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 01:53:26,310 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 01:53:26,311 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 01:53:26,312 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 01:53:26,312 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 01:53:26,313 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 01:53:26,313 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 01:53:26,344 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 01:53:26,345 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 01:53:26,345 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 01:53:26,346 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 01:53:26,392 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 01:53:26,393 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 01:53:26,393 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 01:53:26,393 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 01:53:26,394 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 01:53:26,394 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 01:53:26,394 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 01:53:26,394 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 01:53:26,395 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 01:53:26,395 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 01:53:26,395 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 01:53:26,395 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 01:53:26,395 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 01:53:26,396 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 01:53:26,396 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 01:53:26,396 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 01:53:26,396 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 01:53:26,396 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 01:53:26,397 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 01:53:26,397 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 01:53:26,397 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 01:53:26,398 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 01:53:26,398 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 01:53:26,398 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 01:53:26,398 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 01:53:26,402 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 01:53:26,402 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 01:53:26,403 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 01:53:26,403 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 01:53:26,404 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 01:53:26,404 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 01:53:26,404 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 01:53:26,404 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:53:26,405 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 01:53:26,405 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 01:53:26,405 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 01:53:26,406 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 01:53:26,406 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 01:53:26,406 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 01:53:26,407 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 01:53:26,407 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 01:53:26,407 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_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fc71ae13b1bed24e074eb2de07c8f2064aa903343708c3aabf1b928078c9e7f6 [2022-11-22 01:53:26,684 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 01:53:26,705 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 01:53:26,708 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 01:53:26,709 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 01:53:26,709 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 01:53:26,710 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c [2022-11-22 01:53:30,042 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 01:53:30,338 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 01:53:30,339 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c [2022-11-22 01:53:30,346 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/data/94e03e88c/0afe045e466849b0a556299f3dbfdfd1/FLAG0d850b975 [2022-11-22 01:53:30,669 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/data/94e03e88c/0afe045e466849b0a556299f3dbfdfd1 [2022-11-22 01:53:30,672 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 01:53:30,674 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 01:53:30,676 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 01:53:30,676 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 01:53:30,680 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 01:53:30,681 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:30,683 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f9777de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30, skipping insertion in model container [2022-11-22 01:53:30,684 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:30,692 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 01:53:30,724 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 01:53:30,904 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_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c[490,503] [2022-11-22 01:53:30,929 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:53:30,942 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 01:53:30,955 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_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c[490,503] [2022-11-22 01:53:30,968 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:53:30,985 INFO L208 MainTranslator]: Completed translation [2022-11-22 01:53:30,985 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30 WrapperNode [2022-11-22 01:53:30,986 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 01:53:30,987 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 01:53:30,987 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 01:53:30,987 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 01:53:30,997 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,005 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,030 INFO L138 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2022-11-22 01:53:31,031 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 01:53:31,032 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 01:53:31,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 01:53:31,032 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 01:53:31,044 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,045 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,047 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,047 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,052 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,057 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,058 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,060 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,062 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 01:53:31,063 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 01:53:31,064 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 01:53:31,064 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 01:53:31,065 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (1/1) ... [2022-11-22 01:53:31,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:53:31,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:53:31,116 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 01:53:31,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 01:53:31,182 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 01:53:31,183 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-22 01:53:31,183 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-22 01:53:31,183 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 01:53:31,184 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 01:53:31,185 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 01:53:31,185 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 01:53:31,185 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 01:53:31,288 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 01:53:31,292 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 01:53:31,568 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 01:53:31,613 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 01:53:31,635 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-22 01:53:31,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:53:31 BoogieIcfgContainer [2022-11-22 01:53:31,638 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 01:53:31,641 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 01:53:31,641 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 01:53:31,645 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 01:53:31,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:53:30" (1/3) ... [2022-11-22 01:53:31,646 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58a8bd4f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:53:31, skipping insertion in model container [2022-11-22 01:53:31,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:53:30" (2/3) ... [2022-11-22 01:53:31,647 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58a8bd4f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:53:31, skipping insertion in model container [2022-11-22 01:53:31,647 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:53:31" (3/3) ... [2022-11-22 01:53:31,649 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound50.c [2022-11-22 01:53:31,689 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 01:53:31,690 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 01:53:31,782 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 01:53:31,793 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;@2ee22ecd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 01:53:31,794 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 01:53:31,799 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-22 01:53:31,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-22 01:53:31,813 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:53:31,814 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:53:31,817 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:53:31,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:53:31,827 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2022-11-22 01:53:31,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:53:31,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384254348] [2022-11-22 01:53:31,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:31,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:53:31,966 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:53:31,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1205802955] [2022-11-22 01:53:31,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:31,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:31,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:53:31,972 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:53:31,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 01:53:32,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:53:32,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-22 01:53:32,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:53:32,195 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 01:53:32,196 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:53:32,196 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:53:32,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384254348] [2022-11-22 01:53:32,197 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:53:32,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205802955] [2022-11-22 01:53:32,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205802955] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:53:32,199 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:53:32,199 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 01:53:32,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923113404] [2022-11-22 01:53:32,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:53:32,209 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-22 01:53:32,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:53:32,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-22 01:53:32,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 01:53:32,261 INFO L87 Difference]: Start difference. First operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-22 01:53:32,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:53:32,295 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2022-11-22 01:53:32,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-22 01:53:32,299 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 26 [2022-11-22 01:53:32,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:53:32,307 INFO L225 Difference]: With dead ends: 49 [2022-11-22 01:53:32,308 INFO L226 Difference]: Without dead ends: 28 [2022-11-22 01:53:32,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 01:53:32,315 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 01:53:32,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 01:53:32,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-22 01:53:32,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-22 01:53:32,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-22 01:53:32,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2022-11-22 01:53:32,364 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2022-11-22 01:53:32,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:53:32,367 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2022-11-22 01:53:32,368 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-22 01:53:32,368 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2022-11-22 01:53:32,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-22 01:53:32,370 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:53:32,371 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:53:32,383 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-22 01:53:32,577 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:32,578 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:53:32,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:53:32,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2022-11-22 01:53:32,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:53:32,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707466017] [2022-11-22 01:53:32,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:32,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:53:32,627 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:53:32,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1253613507] [2022-11-22 01:53:32,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:32,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:32,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:53:32,634 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:53:32,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 01:53:32,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:53:32,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 01:53:32,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:53:32,860 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 01:53:32,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:53:33,000 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 01:53:33,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:53:33,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707466017] [2022-11-22 01:53:33,001 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:53:33,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253613507] [2022-11-22 01:53:33,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253613507] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:53:33,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [355886728] [2022-11-22 01:53:33,035 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 01:53:33,035 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:53:33,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:53:33,046 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:53:33,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:53:34,334 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:53:34,361 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:53:35,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [355886728] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:53:35,688 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:53:35,688 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2022-11-22 01:53:35,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489434261] [2022-11-22 01:53:35,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:53:35,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-22 01:53:35,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:53:35,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-22 01:53:35,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2022-11-22 01:53:35,691 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-22 01:53:35,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:53:35,983 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-11-22 01:53:35,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 01:53:35,984 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2022-11-22 01:53:35,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:53:35,986 INFO L225 Difference]: With dead ends: 38 [2022-11-22 01:53:35,987 INFO L226 Difference]: Without dead ends: 30 [2022-11-22 01:53:35,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2022-11-22 01:53:35,992 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 48 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:53:35,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 48 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:53:36,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-22 01:53:36,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-22 01:53:36,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-22 01:53:36,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2022-11-22 01:53:36,027 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2022-11-22 01:53:36,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:53:36,027 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2022-11-22 01:53:36,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-22 01:53:36,027 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2022-11-22 01:53:36,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 01:53:36,028 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:53:36,028 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:53:36,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 01:53:36,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-11-22 01:53:36,231 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:53:36,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:53:36,231 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2022-11-22 01:53:36,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:53:36,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647867224] [2022-11-22 01:53:36,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:36,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:53:36,269 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:53:36,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1990982647] [2022-11-22 01:53:36,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:36,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:36,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:53:36,274 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:53:36,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 01:53:36,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:53:36,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-22 01:53:36,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:53:36,478 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 01:53:36,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:53:36,549 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 01:53:36,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:53:36,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647867224] [2022-11-22 01:53:36,550 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:53:36,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990982647] [2022-11-22 01:53:36,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990982647] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 01:53:36,550 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 01:53:36,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2022-11-22 01:53:36,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463230178] [2022-11-22 01:53:36,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:53:36,551 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:53:36,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:53:36,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:53:36,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-11-22 01:53:36,552 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-22 01:53:36,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:53:36,636 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2022-11-22 01:53:36,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:53:36,637 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 28 [2022-11-22 01:53:36,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:53:36,641 INFO L225 Difference]: With dead ends: 36 [2022-11-22 01:53:36,641 INFO L226 Difference]: Without dead ends: 34 [2022-11-22 01:53:36,642 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 01:53:36,648 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 7 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:53:36,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 101 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:53:36,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-22 01:53:36,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-11-22 01:53:36,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-22 01:53:36,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2022-11-22 01:53:36,686 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2022-11-22 01:53:36,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:53:36,688 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2022-11-22 01:53:36,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-22 01:53:36,689 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2022-11-22 01:53:36,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-22 01:53:36,691 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:53:36,691 INFO L195 NwaCegarLoop]: trace histogram [6, 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] [2022-11-22 01:53:36,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 01:53:36,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:36,898 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:53:36,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:53:36,899 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2022-11-22 01:53:36,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:53:36,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988190126] [2022-11-22 01:53:36,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:36,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:53:36,916 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:53:36,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1065272421] [2022-11-22 01:53:36,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:36,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:36,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:53:36,918 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:53:36,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 01:53:36,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:53:36,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-22 01:53:36,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:53:37,184 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-22 01:53:37,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:53:37,310 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 01:53:37,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:53:37,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988190126] [2022-11-22 01:53:37,314 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:53:37,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065272421] [2022-11-22 01:53:37,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065272421] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 01:53:37,315 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 01:53:37,315 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2022-11-22 01:53:37,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549259086] [2022-11-22 01:53:37,316 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:53:37,317 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:53:37,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:53:37,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:53:37,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 01:53:37,325 INFO L87 Difference]: Start difference. First operand 34 states and 44 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, (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) [2022-11-22 01:53:37,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:53:37,433 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2022-11-22 01:53:37,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:53:37,434 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, (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 33 [2022-11-22 01:53:37,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:53:37,436 INFO L225 Difference]: With dead ends: 47 [2022-11-22 01:53:37,436 INFO L226 Difference]: Without dead ends: 45 [2022-11-22 01:53:37,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-22 01:53:37,439 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 6 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 01:53:37,440 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 122 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 01:53:37,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-22 01:53:37,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2022-11-22 01:53:37,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-22 01:53:37,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2022-11-22 01:53:37,483 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2022-11-22 01:53:37,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:53:37,483 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2022-11-22 01:53:37,484 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, (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) [2022-11-22 01:53:37,484 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2022-11-22 01:53:37,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-22 01:53:37,487 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:53:37,488 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 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] [2022-11-22 01:53:37,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 01:53:37,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:37,695 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:53:37,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:53:37,695 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2022-11-22 01:53:37,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:53:37,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699269627] [2022-11-22 01:53:37,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:37,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:53:37,717 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:53:37,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1593869273] [2022-11-22 01:53:37,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:37,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:37,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:53:37,726 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:53:37,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 01:53:37,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:53:37,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-22 01:53:37,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:53:38,211 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-22 01:53:38,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:53:38,408 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-11-22 01:53:38,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:53:38,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699269627] [2022-11-22 01:53:38,408 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:53:38,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593869273] [2022-11-22 01:53:38,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593869273] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 01:53:38,409 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 01:53:38,409 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [12] total 15 [2022-11-22 01:53:38,409 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221739821] [2022-11-22 01:53:38,409 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:53:38,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-22 01:53:38,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:53:38,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-22 01:53:38,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2022-11-22 01:53:38,412 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-22 01:53:38,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:53:38,551 INFO L93 Difference]: Finished difference Result 51 states and 64 transitions. [2022-11-22 01:53:38,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 01:53:38,551 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 38 [2022-11-22 01:53:38,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:53:38,554 INFO L225 Difference]: With dead ends: 51 [2022-11-22 01:53:38,554 INFO L226 Difference]: Without dead ends: 49 [2022-11-22 01:53:38,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2022-11-22 01:53:38,555 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 9 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:53:38,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 128 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:53:38,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-22 01:53:38,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2022-11-22 01:53:38,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 27 states have internal predecessors, (30), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-22 01:53:38,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 61 transitions. [2022-11-22 01:53:38,595 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 61 transitions. Word has length 38 [2022-11-22 01:53:38,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:53:38,598 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 61 transitions. [2022-11-22 01:53:38,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-22 01:53:38,598 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 61 transitions. [2022-11-22 01:53:38,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-22 01:53:38,599 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:53:38,599 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:53:38,611 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-22 01:53:38,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:38,805 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:53:38,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:53:38,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1793667961, now seen corresponding path program 1 times [2022-11-22 01:53:38,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:53:38,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025834831] [2022-11-22 01:53:38,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:38,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:53:38,819 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:53:38,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [729731415] [2022-11-22 01:53:38,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:38,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:38,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:53:38,821 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:53:38,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 01:53:38,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:53:38,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:53:38,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:53:39,220 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-22 01:53:39,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:53:39,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:53:39,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025834831] [2022-11-22 01:53:39,388 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:53:39,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729731415] [2022-11-22 01:53:39,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [729731415] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:53:39,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1030877044] [2022-11-22 01:53:39,394 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 01:53:39,394 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:53:39,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:53:39,396 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:53:39,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:53:40,625 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-22 01:53:40,635 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:53:40,655 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:53:42,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1030877044] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:53:42,784 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 01:53:42,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [10] total 22 [2022-11-22 01:53:42,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780318828] [2022-11-22 01:53:42,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:53:42,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 01:53:42,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:53:42,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 01:53:42,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2022-11-22 01:53:42,787 INFO L87 Difference]: Start difference. First operand 48 states and 61 transitions. Second operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2022-11-22 01:53:43,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:53:43,312 INFO L93 Difference]: Finished difference Result 73 states and 87 transitions. [2022-11-22 01:53:43,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 01:53:43,313 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 43 [2022-11-22 01:53:43,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:53:43,314 INFO L225 Difference]: With dead ends: 73 [2022-11-22 01:53:43,315 INFO L226 Difference]: Without dead ends: 71 [2022-11-22 01:53:43,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 54 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2022-11-22 01:53:43,316 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 39 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 01:53:43,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 50 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 01:53:43,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-22 01:53:43,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2022-11-22 01:53:43,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 41 states have internal predecessors, (43), 20 states have call successors, (20), 9 states have call predecessors, (20), 9 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-22 01:53:43,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2022-11-22 01:53:43,346 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 43 [2022-11-22 01:53:43,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:53:43,346 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2022-11-22 01:53:43,346 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2022-11-22 01:53:43,347 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2022-11-22 01:53:43,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:53:43,348 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:53:43,348 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 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] [2022-11-22 01:53:43,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 01:53:43,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-22 01:53:43,555 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:53:43,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:53:43,555 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2022-11-22 01:53:43,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:53:43,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647648235] [2022-11-22 01:53:43,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:43,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:53:43,575 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:53:43,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1745806369] [2022-11-22 01:53:43,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:53:43,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:53:43,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:53:43,582 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:53:43,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 01:53:43,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:53:43,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 01:53:43,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:53:43,753 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-22 01:53:43,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:53:43,879 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-22 01:53:43,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:53:43,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647648235] [2022-11-22 01:53:43,880 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:53:43,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745806369] [2022-11-22 01:53:43,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745806369] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:53:43,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [125601197] [2022-11-22 01:53:43,886 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 01:53:43,886 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:53:43,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:53:43,887 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:53:43,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:53:58,458 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 51 for LOIs [2022-11-22 01:53:58,476 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:53:58,492 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:54:03,584 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2208#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:54:03,584 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:54:03,584 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:54:03,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2022-11-22 01:54:03,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511371689] [2022-11-22 01:54:03,585 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:54:03,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 01:54:03,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:54:03,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 01:54:03,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2022-11-22 01:54:03,586 INFO L87 Difference]: Start difference. First operand 69 states and 82 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-11-22 01:54:03,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:54:03,957 INFO L93 Difference]: Finished difference Result 111 states and 148 transitions. [2022-11-22 01:54:03,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-22 01:54:03,960 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 52 [2022-11-22 01:54:03,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:54:03,962 INFO L225 Difference]: With dead ends: 111 [2022-11-22 01:54:03,962 INFO L226 Difference]: Without dead ends: 103 [2022-11-22 01:54:03,963 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 118 SyntacticMatches, 14 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2022-11-22 01:54:03,963 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 34 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:54:03,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 177 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:54:03,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-22 01:54:03,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 94. [2022-11-22 01:54:03,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 53 states have internal predecessors, (61), 32 states have call successors, (32), 9 states have call predecessors, (32), 9 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2022-11-22 01:54:04,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 124 transitions. [2022-11-22 01:54:04,003 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 124 transitions. Word has length 52 [2022-11-22 01:54:04,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:54:04,004 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 124 transitions. [2022-11-22 01:54:04,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-11-22 01:54:04,004 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 124 transitions. [2022-11-22 01:54:04,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 01:54:04,005 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:54:04,005 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 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] [2022-11-22 01:54:04,016 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 01:54:04,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-22 01:54:04,206 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:54:04,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:54:04,207 INFO L85 PathProgramCache]: Analyzing trace with hash -243308457, now seen corresponding path program 1 times [2022-11-22 01:54:04,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:54:04,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535962765] [2022-11-22 01:54:04,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:54:04,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:54:04,217 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:54:04,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [679603750] [2022-11-22 01:54:04,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:54:04,218 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:54:04,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:54:04,219 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:54:04,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 01:54:04,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:54:04,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:54:04,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:54:04,431 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 23 proven. 10 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-22 01:54:04,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:54:04,625 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-22 01:54:04,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:54:04,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1535962765] [2022-11-22 01:54:04,626 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:54:04,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679603750] [2022-11-22 01:54:04,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679603750] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:54:04,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1866311160] [2022-11-22 01:54:04,630 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 01:54:04,630 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:54:04,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:54:04,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:54:04,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:54:16,242 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-22 01:54:16,251 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:54:16,263 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:54:21,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1866311160] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:54:21,802 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:54:21,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [9, 7] total 28 [2022-11-22 01:54:21,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629348544] [2022-11-22 01:54:21,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:54:21,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-22 01:54:21,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:54:21,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-22 01:54:21,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=620, Unknown=0, NotChecked=0, Total=756 [2022-11-22 01:54:21,805 INFO L87 Difference]: Start difference. First operand 94 states and 124 transitions. Second operand has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-22 01:54:23,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:54:23,688 INFO L93 Difference]: Finished difference Result 113 states and 146 transitions. [2022-11-22 01:54:23,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 01:54:23,689 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 58 [2022-11-22 01:54:23,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:54:23,690 INFO L225 Difference]: With dead ends: 113 [2022-11-22 01:54:23,691 INFO L226 Difference]: Without dead ends: 111 [2022-11-22 01:54:23,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 130 SyntacticMatches, 16 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 453 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2022-11-22 01:54:23,692 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 57 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 01:54:23,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 59 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 01:54:23,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-11-22 01:54:23,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-11-22 01:54:23,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 63 states have (on average 1.1587301587301588) internal successors, (73), 64 states have internal predecessors, (73), 36 states have call successors, (36), 11 states have call predecessors, (36), 11 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2022-11-22 01:54:23,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 144 transitions. [2022-11-22 01:54:23,732 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 144 transitions. Word has length 58 [2022-11-22 01:54:23,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:54:23,733 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 144 transitions. [2022-11-22 01:54:23,733 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-22 01:54:23,733 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 144 transitions. [2022-11-22 01:54:23,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-22 01:54:23,734 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:54:23,734 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 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] [2022-11-22 01:54:23,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 01:54:23,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:54:23,941 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:54:23,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:54:23,941 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 1 times [2022-11-22 01:54:23,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:54:23,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839033449] [2022-11-22 01:54:23,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:54:23,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:54:23,954 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:54:23,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [932530516] [2022-11-22 01:54:23,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:54:23,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:54:23,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:54:23,956 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:54:23,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 01:54:24,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:54:24,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 01:54:24,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:54:24,174 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2022-11-22 01:54:24,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:54:24,301 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2022-11-22 01:54:24,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:54:24,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839033449] [2022-11-22 01:54:24,302 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:54:24,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932530516] [2022-11-22 01:54:24,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932530516] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:54:24,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2063470429] [2022-11-22 01:54:24,305 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 01:54:24,305 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:54:24,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:54:24,306 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:54:24,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:54:29,528 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-22 01:54:29,581 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:54:29,596 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:54:35,546 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3661#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:54:35,547 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:54:35,547 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:54:35,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-22 01:54:35,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945289592] [2022-11-22 01:54:35,547 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:54:35,548 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 01:54:35,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:54:35,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 01:54:35,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2022-11-22 01:54:35,550 INFO L87 Difference]: Start difference. First operand 111 states and 144 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2022-11-22 01:54:35,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:54:35,798 INFO L93 Difference]: Finished difference Result 122 states and 158 transitions. [2022-11-22 01:54:35,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 01:54:35,798 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 65 [2022-11-22 01:54:35,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:54:35,802 INFO L225 Difference]: With dead ends: 122 [2022-11-22 01:54:35,802 INFO L226 Difference]: Without dead ends: 120 [2022-11-22 01:54:35,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 157 SyntacticMatches, 11 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2022-11-22 01:54:35,804 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:54:35,804 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 74 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:54:35,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-11-22 01:54:35,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2022-11-22 01:54:35,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 67 states have (on average 1.1492537313432836) internal successors, (77), 69 states have internal predecessors, (77), 40 states have call successors, (40), 12 states have call predecessors, (40), 12 states have return successors, (39), 38 states have call predecessors, (39), 39 states have call successors, (39) [2022-11-22 01:54:35,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 156 transitions. [2022-11-22 01:54:35,861 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 156 transitions. Word has length 65 [2022-11-22 01:54:35,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:54:35,862 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 156 transitions. [2022-11-22 01:54:35,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2022-11-22 01:54:35,862 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 156 transitions. [2022-11-22 01:54:35,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-22 01:54:35,864 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:54:35,864 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:54:35,870 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-22 01:54:36,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:54:36,070 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:54:36,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:54:36,071 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2022-11-22 01:54:36,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:54:36,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781628351] [2022-11-22 01:54:36,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:54:36,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:54:36,084 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:54:36,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1910496601] [2022-11-22 01:54:36,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:54:36,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:54:36,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:54:36,086 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:54:36,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 01:54:36,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:54:36,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-22 01:54:36,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:54:36,799 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 18 proven. 11 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2022-11-22 01:54:36,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:54:37,563 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-11-22 01:54:37,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:54:37,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781628351] [2022-11-22 01:54:37,563 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:54:37,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910496601] [2022-11-22 01:54:37,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910496601] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:54:37,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [742960738] [2022-11-22 01:54:37,566 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 01:54:37,566 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:54:37,566 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:54:37,567 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:54:37,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:54:41,424 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:54:41,428 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:54:41,454 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:04,193 WARN L233 SmtUtils]: Spent 13.92s on a formula simplification. DAG size of input: 83 DAG size of output: 76 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:55:21,383 WARN L233 SmtUtils]: Spent 15.06s on a formula simplification. DAG size of input: 85 DAG size of output: 76 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:55:21,831 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4513#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:21,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:21,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:55:21,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-11-22 01:55:21,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656526172] [2022-11-22 01:55:21,832 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:21,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 01:55:21,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:21,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 01:55:21,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1367, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 01:55:21,834 INFO L87 Difference]: Start difference. First operand 120 states and 156 transitions. Second operand has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-22 01:55:36,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:36,985 INFO L93 Difference]: Finished difference Result 199 states and 279 transitions. [2022-11-22 01:55:36,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 01:55:36,986 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 74 [2022-11-22 01:55:36,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:36,990 INFO L225 Difference]: With dead ends: 199 [2022-11-22 01:55:36,990 INFO L226 Difference]: Without dead ends: 197 [2022-11-22 01:55:36,991 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 170 SyntacticMatches, 12 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1425 ImplicationChecksByTransitivity, 48.9s TimeCoverageRelationStatistics Valid=437, Invalid=3103, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 01:55:36,992 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 111 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 911 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 1096 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 911 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:36,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 375 Invalid, 1096 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 911 Invalid, 0 Unknown, 0 Unchecked, 7.1s Time] [2022-11-22 01:55:36,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-11-22 01:55:37,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 187. [2022-11-22 01:55:37,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 99 states have (on average 1.2222222222222223) internal successors, (121), 101 states have internal predecessors, (121), 73 states have call successors, (73), 14 states have call predecessors, (73), 14 states have return successors, (72), 71 states have call predecessors, (72), 72 states have call successors, (72) [2022-11-22 01:55:37,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 266 transitions. [2022-11-22 01:55:37,108 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 266 transitions. Word has length 74 [2022-11-22 01:55:37,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:37,108 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 266 transitions. [2022-11-22 01:55:37,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-22 01:55:37,109 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 266 transitions. [2022-11-22 01:55:37,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-22 01:55:37,111 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:37,112 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 6, 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] [2022-11-22 01:55:37,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:37,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 01:55:37,316 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:37,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:37,316 INFO L85 PathProgramCache]: Analyzing trace with hash -134461569, now seen corresponding path program 1 times [2022-11-22 01:55:37,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:37,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530569405] [2022-11-22 01:55:37,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:37,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:37,328 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:55:37,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [475413603] [2022-11-22 01:55:37,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:37,329 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:37,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:37,330 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:37,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 01:55:37,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:37,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-22 01:55:37,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:37,770 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 16 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-11-22 01:55:37,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:38,067 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-11-22 01:55:38,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:38,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530569405] [2022-11-22 01:55:38,068 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:55:38,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475413603] [2022-11-22 01:55:38,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475413603] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:38,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2101357467] [2022-11-22 01:55:38,070 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 01:55:38,070 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:38,071 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:38,071 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:38,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:41,441 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:55:41,445 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:55:41,461 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:15,133 WARN L233 SmtUtils]: Spent 28.16s on a formula simplification. DAG size of input: 180 DAG size of output: 147 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:56:33,977 WARN L233 SmtUtils]: Spent 10.84s on a formula simplification. DAG size of input: 77 DAG size of output: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:56:59,823 WARN L233 SmtUtils]: Spent 23.27s on a formula simplification. DAG size of input: 178 DAG size of output: 87 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:57:00,429 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5672#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:00,429 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:00,429 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:57:00,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 19 [2022-11-22 01:57:00,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101348536] [2022-11-22 01:57:00,430 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:00,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 01:57:00,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:00,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 01:57:00,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1364, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 01:57:00,432 INFO L87 Difference]: Start difference. First operand 187 states and 266 transitions. Second operand has 19 states, 18 states have (on average 2.0) internal successors, (36), 15 states have internal predecessors, (36), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2022-11-22 01:57:04,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:04,729 INFO L93 Difference]: Finished difference Result 231 states and 326 transitions. [2022-11-22 01:57:04,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 01:57:04,729 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 15 states have internal predecessors, (36), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) Word has length 79 [2022-11-22 01:57:04,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:04,732 INFO L225 Difference]: With dead ends: 231 [2022-11-22 01:57:04,732 INFO L226 Difference]: Without dead ends: 225 [2022-11-22 01:57:04,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 201 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 823 ImplicationChecksByTransitivity, 81.7s TimeCoverageRelationStatistics Valid=332, Invalid=2320, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 01:57:04,735 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 74 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 594 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 697 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:04,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 147 Invalid, 697 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 594 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-22 01:57:04,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2022-11-22 01:57:04,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 197. [2022-11-22 01:57:04,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 108 states have (on average 1.1759259259259258) internal successors, (127), 109 states have internal predecessors, (127), 71 states have call successors, (71), 17 states have call predecessors, (71), 17 states have return successors, (70), 70 states have call predecessors, (70), 70 states have call successors, (70) [2022-11-22 01:57:04,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 268 transitions. [2022-11-22 01:57:04,861 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 268 transitions. Word has length 79 [2022-11-22 01:57:04,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:04,862 INFO L495 AbstractCegarLoop]: Abstraction has 197 states and 268 transitions. [2022-11-22 01:57:04,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 15 states have internal predecessors, (36), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2022-11-22 01:57:04,863 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 268 transitions. [2022-11-22 01:57:04,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-22 01:57:04,864 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:04,864 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:04,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:05,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 01:57:05,071 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:05,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:05,071 INFO L85 PathProgramCache]: Analyzing trace with hash 145896886, now seen corresponding path program 1 times [2022-11-22 01:57:05,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:05,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172147751] [2022-11-22 01:57:05,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:05,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:05,088 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:57:05,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1753246895] [2022-11-22 01:57:05,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:05,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:05,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:05,096 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:05,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 01:57:05,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:05,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-22 01:57:05,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:06,235 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 53 proven. 22 refuted. 0 times theorem prover too weak. 215 trivial. 0 not checked. [2022-11-22 01:57:06,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:08,013 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 51 proven. 19 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2022-11-22 01:57:08,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:08,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172147751] [2022-11-22 01:57:08,013 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:57:08,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753246895] [2022-11-22 01:57:08,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753246895] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:08,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1085740795] [2022-11-22 01:57:08,016 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 01:57:08,017 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:08,017 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:08,017 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:08,017 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:11,445 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:57:11,449 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:57:11,462 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:43,851 WARN L233 SmtUtils]: Spent 18.49s on a formula simplification. DAG size of input: 77 DAG size of output: 70 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:58:02,887 WARN L233 SmtUtils]: Spent 17.42s on a formula simplification. DAG size of input: 79 DAG size of output: 72 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:58:02,890 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6952#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:02,890 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:02,890 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:58:02,890 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 21 [2022-11-22 01:58:02,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249280324] [2022-11-22 01:58:02,891 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:02,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-22 01:58:02,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:02,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-22 01:58:02,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1358, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 01:58:02,893 INFO L87 Difference]: Start difference. First operand 197 states and 268 transitions. Second operand has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 11 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 11 states have call predecessors, (32), 10 states have call successors, (32) [2022-11-22 01:58:23,283 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:58:25,468 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:58:38,145 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:58:50,794 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:58:53,870 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:58:54,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:54,075 INFO L93 Difference]: Finished difference Result 274 states and 382 transitions. [2022-11-22 01:58:54,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-22 01:58:54,076 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 11 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 11 states have call predecessors, (32), 10 states have call successors, (32) Word has length 90 [2022-11-22 01:58:54,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:54,078 INFO L225 Difference]: With dead ends: 274 [2022-11-22 01:58:54,078 INFO L226 Difference]: Without dead ends: 272 [2022-11-22 01:58:54,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 228 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 993 ImplicationChecksByTransitivity, 82.6s TimeCoverageRelationStatistics Valid=463, Invalid=2726, Unknown=3, NotChecked=0, Total=3192 [2022-11-22 01:58:54,080 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 120 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 792 mSolverCounterSat, 182 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 792 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.9s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:54,081 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 119 Invalid, 979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 792 Invalid, 5 Unknown, 0 Unchecked, 20.9s Time] [2022-11-22 01:58:54,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2022-11-22 01:58:54,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 254. [2022-11-22 01:58:54,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 139 states have (on average 1.1726618705035972) internal successors, (163), 142 states have internal predecessors, (163), 95 states have call successors, (95), 19 states have call predecessors, (95), 19 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2022-11-22 01:58:54,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 352 transitions. [2022-11-22 01:58:54,234 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 352 transitions. Word has length 90 [2022-11-22 01:58:54,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:54,235 INFO L495 AbstractCegarLoop]: Abstraction has 254 states and 352 transitions. [2022-11-22 01:58:54,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 11 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 11 states have call predecessors, (32), 10 states have call successors, (32) [2022-11-22 01:58:54,235 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 352 transitions. [2022-11-22 01:58:54,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-22 01:58:54,237 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:54,237 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:54,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:54,440 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-22 01:58:54,440 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:54,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:54,440 INFO L85 PathProgramCache]: Analyzing trace with hash 2106799636, now seen corresponding path program 2 times [2022-11-22 01:58:54,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:54,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492089177] [2022-11-22 01:58:54,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:54,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:54,451 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:58:54,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [692511642] [2022-11-22 01:58:54,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:58:54,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:54,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:54,456 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:54,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 01:58:54,515 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 01:58:54,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:54,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 01:58:54,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:54,549 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2022-11-22 01:58:54,549 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:58:54,550 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:54,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492089177] [2022-11-22 01:58:54,550 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:58:54,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692511642] [2022-11-22 01:58:54,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [692511642] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:58:54,550 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:58:54,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 01:58:54,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928393085] [2022-11-22 01:58:54,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:58:54,551 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:58:54,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:54,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:58:54,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:58:54,552 INFO L87 Difference]: Start difference. First operand 254 states and 352 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2022-11-22 01:58:54,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:54,779 INFO L93 Difference]: Finished difference Result 353 states and 485 transitions. [2022-11-22 01:58:54,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:58:54,780 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 99 [2022-11-22 01:58:54,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:54,782 INFO L225 Difference]: With dead ends: 353 [2022-11-22 01:58:54,782 INFO L226 Difference]: Without dead ends: 229 [2022-11-22 01:58:54,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-22 01:58:54,784 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 7 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:54,784 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 128 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:58:54,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-11-22 01:58:54,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 197. [2022-11-22 01:58:54,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 110 states have (on average 1.1181818181818182) internal successors, (123), 113 states have internal predecessors, (123), 67 states have call successors, (67), 19 states have call predecessors, (67), 19 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2022-11-22 01:58:54,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 256 transitions. [2022-11-22 01:58:54,908 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 256 transitions. Word has length 99 [2022-11-22 01:58:54,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:54,908 INFO L495 AbstractCegarLoop]: Abstraction has 197 states and 256 transitions. [2022-11-22 01:58:54,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2022-11-22 01:58:54,909 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 256 transitions. [2022-11-22 01:58:54,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-11-22 01:58:54,910 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:54,910 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:54,914 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-22 01:58:55,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 01:58:55,114 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:55,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:55,115 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 2 times [2022-11-22 01:58:55,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:55,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443221272] [2022-11-22 01:58:55,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:55,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:55,127 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:58:55,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2126283954] [2022-11-22 01:58:55,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:58:55,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:55,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:55,128 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:55,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 01:58:55,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 01:58:55,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:55,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-22 01:58:55,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:55,992 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 33 proven. 32 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2022-11-22 01:58:55,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:58,049 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2022-11-22 01:58:58,049 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:58,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443221272] [2022-11-22 01:58:58,049 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:58:58,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126283954] [2022-11-22 01:58:58,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126283954] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:58,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1348118744] [2022-11-22 01:58:58,052 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 01:58:58,052 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:58,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:58,052 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:58,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:01,613 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-22 01:59:01,617 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 01:59:01,629 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:23,797 WARN L233 SmtUtils]: Spent 15.14s on a formula simplification. DAG size of input: 77 DAG size of output: 70 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:59:47,222 WARN L233 SmtUtils]: Spent 21.49s on a formula simplification. DAG size of input: 79 DAG size of output: 72 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:59:47,337 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9664#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:47,337 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:47,337 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:59:47,337 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2022-11-22 01:59:47,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689602531] [2022-11-22 01:59:47,337 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:47,338 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-22 01:59:47,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:47,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-22 01:59:47,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1359, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 01:59:47,339 INFO L87 Difference]: Start difference. First operand 197 states and 256 transitions. Second operand has 21 states, 20 states have (on average 1.9) internal successors, (38), 19 states have internal predecessors, (38), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) [2022-11-22 02:00:15,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:15,874 INFO L93 Difference]: Finished difference Result 315 states and 440 transitions. [2022-11-22 02:00:15,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-22 02:00:15,874 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 19 states have internal predecessors, (38), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) Word has length 107 [2022-11-22 02:00:15,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:15,876 INFO L225 Difference]: With dead ends: 315 [2022-11-22 02:00:15,876 INFO L226 Difference]: Without dead ends: 313 [2022-11-22 02:00:15,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 276 SyntacticMatches, 5 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1325 ImplicationChecksByTransitivity, 62.0s TimeCoverageRelationStatistics Valid=637, Invalid=3785, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 02:00:15,879 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 118 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 1084 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 1300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 1084 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:15,879 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 394 Invalid, 1300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 1084 Invalid, 0 Unknown, 0 Unchecked, 12.9s Time] [2022-11-22 02:00:15,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2022-11-22 02:00:16,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 278. [2022-11-22 02:00:16,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 148 states have (on average 1.1554054054054055) internal successors, (171), 151 states have internal predecessors, (171), 107 states have call successors, (107), 22 states have call predecessors, (107), 22 states have return successors, (106), 104 states have call predecessors, (106), 106 states have call successors, (106) [2022-11-22 02:00:16,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 384 transitions. [2022-11-22 02:00:16,091 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 384 transitions. Word has length 107 [2022-11-22 02:00:16,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:16,092 INFO L495 AbstractCegarLoop]: Abstraction has 278 states and 384 transitions. [2022-11-22 02:00:16,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 19 states have internal predecessors, (38), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) [2022-11-22 02:00:16,092 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 384 transitions. [2022-11-22 02:00:16,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-22 02:00:16,094 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:16,094 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:16,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 02:00:16,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:16,300 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:16,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:16,301 INFO L85 PathProgramCache]: Analyzing trace with hash -743497349, now seen corresponding path program 3 times [2022-11-22 02:00:16,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:16,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761774467] [2022-11-22 02:00:16,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:16,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:16,312 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:00:16,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [261543820] [2022-11-22 02:00:16,312 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:00:16,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:16,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:16,314 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:16,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 02:00:16,398 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:00:16,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:00:16,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 59 conjunts are in the unsatisfiable core [2022-11-22 02:00:16,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:17,164 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 30 proven. 40 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2022-11-22 02:00:17,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:19,046 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 36 proven. 29 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2022-11-22 02:00:19,046 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:19,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761774467] [2022-11-22 02:00:19,046 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:00:19,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261543820] [2022-11-22 02:00:19,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [261543820] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:19,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1882498755] [2022-11-22 02:00:19,049 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:00:19,049 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:19,050 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:19,051 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:19,051 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:20,612 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-22 02:00:20,672 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 02:00:20,684 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:49,980 WARN L233 SmtUtils]: Spent 23.09s on a formula simplification. DAG size of input: 180 DAG size of output: 151 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:01:14,923 WARN L233 SmtUtils]: Spent 16.46s on a formula simplification. DAG size of input: 77 DAG size of output: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:01:15,510 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11359#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:01:15,510 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:01:15,510 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:01:15,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 24 [2022-11-22 02:01:15,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268326915] [2022-11-22 02:01:15,510 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:01:15,511 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-22 02:01:15,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:15,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-22 02:01:15,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1575, Unknown=1, NotChecked=0, Total=1806 [2022-11-22 02:01:15,512 INFO L87 Difference]: Start difference. First operand 278 states and 384 transitions. Second operand has 24 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 21 states have internal predecessors, (44), 12 states have call successors, (39), 3 states have call predecessors, (39), 2 states have return successors, (38), 12 states have call predecessors, (38), 12 states have call successors, (38) [2022-11-22 02:01:35,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:35,778 INFO L93 Difference]: Finished difference Result 434 states and 623 transitions. [2022-11-22 02:01:35,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 02:01:35,779 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 21 states have internal predecessors, (44), 12 states have call successors, (39), 3 states have call predecessors, (39), 2 states have return successors, (38), 12 states have call predecessors, (38), 12 states have call successors, (38) Word has length 110 [2022-11-22 02:01:35,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:35,782 INFO L225 Difference]: With dead ends: 434 [2022-11-22 02:01:35,782 INFO L226 Difference]: Without dead ends: 432 [2022-11-22 02:01:35,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 271 SyntacticMatches, 16 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1874 ImplicationChecksByTransitivity, 66.9s TimeCoverageRelationStatistics Valid=551, Invalid=3480, Unknown=1, NotChecked=0, Total=4032 [2022-11-22 02:01:35,786 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 126 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 1009 mSolverCounterSat, 271 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 1280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 271 IncrementalHoareTripleChecker+Valid, 1009 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:35,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 333 Invalid, 1280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [271 Valid, 1009 Invalid, 0 Unknown, 0 Unchecked, 9.2s Time] [2022-11-22 02:01:35,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2022-11-22 02:01:36,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 406. [2022-11-22 02:01:36,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 211 states have (on average 1.1753554502369667) internal successors, (248), 214 states have internal predecessors, (248), 167 states have call successors, (167), 27 states have call predecessors, (167), 27 states have return successors, (166), 164 states have call predecessors, (166), 166 states have call successors, (166) [2022-11-22 02:01:36,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 581 transitions. [2022-11-22 02:01:36,267 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 581 transitions. Word has length 110 [2022-11-22 02:01:36,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:36,267 INFO L495 AbstractCegarLoop]: Abstraction has 406 states and 581 transitions. [2022-11-22 02:01:36,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 21 states have internal predecessors, (44), 12 states have call successors, (39), 3 states have call predecessors, (39), 2 states have return successors, (38), 12 states have call predecessors, (38), 12 states have call successors, (38) [2022-11-22 02:01:36,268 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 581 transitions. [2022-11-22 02:01:36,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-22 02:01:36,273 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:36,274 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:36,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 02:01:36,479 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:36,479 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:36,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:36,480 INFO L85 PathProgramCache]: Analyzing trace with hash 1538893617, now seen corresponding path program 3 times [2022-11-22 02:01:36,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:36,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510921972] [2022-11-22 02:01:36,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:36,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:36,490 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:01:36,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [348456193] [2022-11-22 02:01:36,491 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:01:36,491 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:36,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:36,492 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:36,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 02:01:36,586 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:01:36,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:01:36,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-22 02:01:36,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:37,528 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 34 proven. 46 refuted. 0 times theorem prover too weak. 505 trivial. 0 not checked. [2022-11-22 02:01:37,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:42,366 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 32 proven. 43 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2022-11-22 02:01:42,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:42,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510921972] [2022-11-22 02:01:42,367 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:01:42,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348456193] [2022-11-22 02:01:42,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348456193] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:42,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [49612172] [2022-11-22 02:01:42,369 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 02:01:42,369 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:42,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:42,370 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:42,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:45,199 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-22 02:01:45,246 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 02:01:45,258 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:19,604 WARN L233 SmtUtils]: Spent 28.89s on a formula simplification. DAG size of input: 180 DAG size of output: 151 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:02:36,717 WARN L233 SmtUtils]: Spent 11.40s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:02:57,604 WARN L233 SmtUtils]: Spent 20.05s on a formula simplification. DAG size of input: 77 DAG size of output: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:03:27,963 WARN L233 SmtUtils]: Spent 26.43s on a formula simplification. DAG size of input: 178 DAG size of output: 87 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:03:28,109 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13526#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:03:28,109 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:03:28,109 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:03:28,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2022-11-22 02:03:28,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745533219] [2022-11-22 02:03:28,110 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:28,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-22 02:03:28,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:28,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-22 02:03:28,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=1903, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 02:03:28,112 INFO L87 Difference]: Start difference. First operand 406 states and 581 transitions. Second operand has 27 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 24 states have internal predecessors, (46), 14 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (42), 12 states have call predecessors, (42), 12 states have call successors, (42) [2022-11-22 02:04:26,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:04:26,176 INFO L93 Difference]: Finished difference Result 508 states and 730 transitions. [2022-11-22 02:04:26,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-22 02:04:26,177 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 24 states have internal predecessors, (46), 14 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (42), 12 states have call predecessors, (42), 12 states have call successors, (42) Word has length 121 [2022-11-22 02:04:26,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:04:26,179 INFO L225 Difference]: With dead ends: 508 [2022-11-22 02:04:26,179 INFO L226 Difference]: Without dead ends: 500 [2022-11-22 02:04:26,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 297 SyntacticMatches, 19 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3240 ImplicationChecksByTransitivity, 133.3s TimeCoverageRelationStatistics Valid=1010, Invalid=6822, Unknown=0, NotChecked=0, Total=7832 [2022-11-22 02:04:26,181 INFO L413 NwaCegarLoop]: 105 mSDtfsCounter, 200 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 2104 mSolverCounterSat, 418 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 580 SdHoareTripleChecker+Invalid, 2522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 418 IncrementalHoareTripleChecker+Valid, 2104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:04:26,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 580 Invalid, 2522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [418 Valid, 2104 Invalid, 0 Unknown, 0 Unchecked, 30.1s Time] [2022-11-22 02:04:26,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 500 states. [2022-11-22 02:04:26,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 500 to 484. [2022-11-22 02:04:26,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 249 states have (on average 1.1686746987951808) internal successors, (291), 253 states have internal predecessors, (291), 203 states have call successors, (203), 31 states have call predecessors, (203), 31 states have return successors, (202), 199 states have call predecessors, (202), 202 states have call successors, (202) [2022-11-22 02:04:26,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 696 transitions. [2022-11-22 02:04:26,675 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 696 transitions. Word has length 121 [2022-11-22 02:04:26,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:26,675 INFO L495 AbstractCegarLoop]: Abstraction has 484 states and 696 transitions. [2022-11-22 02:04:26,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 24 states have internal predecessors, (46), 14 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (42), 12 states have call predecessors, (42), 12 states have call successors, (42) [2022-11-22 02:04:26,676 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 696 transitions. [2022-11-22 02:04:26,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-22 02:04:26,678 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:26,678 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:04:26,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 02:04:26,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 02:04:26,885 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:04:26,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:26,885 INFO L85 PathProgramCache]: Analyzing trace with hash -1914774331, now seen corresponding path program 4 times [2022-11-22 02:04:26,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:26,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397869049] [2022-11-22 02:04:26,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:26,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:26,898 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:04:26,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [844293748] [2022-11-22 02:04:26,898 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:04:26,898 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:26,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:26,900 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:26,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf5fd8ec-174d-443c-b6d9-7d2260e3097a/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 02:04:27,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:27,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-22 02:04:27,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:29,663 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 93 proven. 67 refuted. 0 times theorem prover too weak. 655 trivial. 0 not checked. [2022-11-22 02:04:29,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:04:37,005 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 91 proven. 63 refuted. 1 times theorem prover too weak. 660 trivial. 0 not checked. [2022-11-22 02:04:37,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:37,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397869049] [2022-11-22 02:04:37,006 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:04:37,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844293748] [2022-11-22 02:04:37,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844293748] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:04:37,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1731680833] [2022-11-22 02:04:37,008 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:04:37,008 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:04:37,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:04:37,009 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:04:37,009 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:04:38,615 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-22 02:04:38,662 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-22 02:04:38,674 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:05:19,010 WARN L233 SmtUtils]: Spent 33.14s on a formula simplification. DAG size of input: 180 DAG size of output: 147 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:06:05,606 WARN L233 SmtUtils]: Spent 19.34s on a formula simplification. DAG size of input: 77 DAG size of output: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:06:17,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16084#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:06:17,672 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:06:17,672 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:06:17,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 30 [2022-11-22 02:06:17,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623705180] [2022-11-22 02:06:17,672 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:06:17,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 02:06:17,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:06:17,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 02:06:17,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=2036, Unknown=6, NotChecked=0, Total=2352 [2022-11-22 02:06:17,675 INFO L87 Difference]: Start difference. First operand 484 states and 696 transitions. Second operand has 30 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 27 states have internal predecessors, (53), 15 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (48), 15 states have call predecessors, (48), 14 states have call successors, (48) [2022-11-22 02:06:20,216 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:06:37,060 WARN L233 SmtUtils]: Spent 10.14s on a formula simplification that was a NOOP. DAG size: 142 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:06:43,248 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:07:10,472 WARN L233 SmtUtils]: Spent 26.99s on a formula simplification that was a NOOP. DAG size: 115 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:07:11,653 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:07:13,658 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:07:14,717 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:07:20,736 WARN L233 SmtUtils]: Spent 5.62s on a formula simplification that was a NOOP. DAG size: 96 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:07:44,552 WARN L233 SmtUtils]: Spent 22.36s on a formula simplification that was a NOOP. DAG size: 139 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:07:47,511 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:07:50,329 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.89s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:07:52,357 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:08:05,765 WARN L233 SmtUtils]: Spent 7.05s on a formula simplification that was a NOOP. DAG size: 109 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)