./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh --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 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b --- 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-2329fc7 [2022-12-14 04:53:33,167 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 04:53:33,169 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 04:53:33,181 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 04:53:33,181 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 04:53:33,182 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 04:53:33,183 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 04:53:33,184 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 04:53:33,185 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 04:53:33,186 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 04:53:33,187 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 04:53:33,187 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 04:53:33,188 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 04:53:33,188 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 04:53:33,189 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 04:53:33,190 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 04:53:33,191 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 04:53:33,191 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 04:53:33,192 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 04:53:33,193 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 04:53:33,194 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 04:53:33,195 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 04:53:33,196 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 04:53:33,197 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 04:53:33,199 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 04:53:33,199 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 04:53:33,199 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 04:53:33,200 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 04:53:33,200 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 04:53:33,201 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 04:53:33,201 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 04:53:33,202 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 04:53:33,202 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 04:53:33,203 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 04:53:33,203 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 04:53:33,203 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 04:53:33,204 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 04:53:33,204 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 04:53:33,204 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 04:53:33,205 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 04:53:33,205 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 04:53:33,206 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 04:53:33,220 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 04:53:33,221 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 04:53:33,225 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 04:53:33,225 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 04:53:33,226 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 04:53:33,226 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 04:53:33,226 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 04:53:33,226 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 04:53:33,226 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 04:53:33,226 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 04:53:33,226 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 04:53:33,226 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 04:53:33,227 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 04:53:33,227 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 04:53:33,227 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 04:53:33,227 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 04:53:33,227 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 04:53:33,227 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 04:53:33,227 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 04:53:33,228 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 04:53:33,229 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 04:53:33,229 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 04:53:33,229 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 04:53:33,229 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 04:53:33,229 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 04:53:33,229 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 04:53:33,229 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 04:53:33,229 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 04:53:33,229 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 04:53:33,229 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 04:53:33,229 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 04:53:33,230 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_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b [2022-12-14 04:53:33,386 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 04:53:33,404 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 04:53:33,407 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 04:53:33,408 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 04:53:33,408 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 04:53:33,409 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2022-12-14 04:53:36,001 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 04:53:36,155 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 04:53:36,155 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2022-12-14 04:53:36,160 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/data/74ad67627/d111898408f24999b0a14e26a71e359e/FLAGcaa22fb42 [2022-12-14 04:53:36,576 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/data/74ad67627/d111898408f24999b0a14e26a71e359e [2022-12-14 04:53:36,578 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 04:53:36,579 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 04:53:36,580 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 04:53:36,580 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 04:53:36,583 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 04:53:36,583 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,584 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33d0d32b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36, skipping insertion in model container [2022-12-14 04:53:36,584 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,589 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 04:53:36,600 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 04:53:36,697 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_ca152b34-97ff-420e-9c8b-da418db1f45d/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2022-12-14 04:53:36,710 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 04:53:36,717 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 04:53:36,725 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_ca152b34-97ff-420e-9c8b-da418db1f45d/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2022-12-14 04:53:36,731 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 04:53:36,741 INFO L208 MainTranslator]: Completed translation [2022-12-14 04:53:36,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36 WrapperNode [2022-12-14 04:53:36,741 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 04:53:36,742 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 04:53:36,742 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 04:53:36,742 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 04:53:36,747 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,752 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,763 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 91 [2022-12-14 04:53:36,763 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 04:53:36,764 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 04:53:36,764 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 04:53:36,764 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 04:53:36,770 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,770 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,771 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,771 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,773 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,775 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,776 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,776 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,778 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 04:53:36,778 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 04:53:36,778 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 04:53:36,778 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 04:53:36,779 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (1/1) ... [2022-12-14 04:53:36,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 04:53:36,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:36,800 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 04:53:36,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 04:53:36,827 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 04:53:36,827 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-12-14 04:53:36,827 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-12-14 04:53:36,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 04:53:36,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 04:53:36,828 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 04:53:36,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 04:53:36,828 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 04:53:36,884 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 04:53:36,886 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 04:53:37,002 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 04:53:37,016 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 04:53:37,016 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-14 04:53:37,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:53:37 BoogieIcfgContainer [2022-12-14 04:53:37,018 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 04:53:37,019 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 04:53:37,019 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 04:53:37,021 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 04:53:37,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 04:53:36" (1/3) ... [2022-12-14 04:53:37,022 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69ee21ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:53:37, skipping insertion in model container [2022-12-14 04:53:37,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:53:36" (2/3) ... [2022-12-14 04:53:37,022 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69ee21ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:53:37, skipping insertion in model container [2022-12-14 04:53:37,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:53:37" (3/3) ... [2022-12-14 04:53:37,023 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound50.c [2022-12-14 04:53:37,037 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 04:53:37,037 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 04:53:37,070 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 04:53:37,074 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;@3bc783fb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 04:53:37,074 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 04:53:37,077 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-12-14 04:53:37,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 04:53:37,082 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:53:37,082 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:53:37,083 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:53:37,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:53:37,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1826888722, now seen corresponding path program 1 times [2022-12-14 04:53:37,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:53:37,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695705276] [2022-12-14 04:53:37,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:37,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:53:37,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:37,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:53:37,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695705276] [2022-12-14 04:53:37,177 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-12-14 04:53:37,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1313048249] [2022-12-14 04:53:37,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:37,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:37,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:37,179 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:53:37,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 04:53:37,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:37,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 1 conjunts are in the unsatisfiable core [2022-12-14 04:53:37,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:53:37,259 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:53:37,259 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 04:53:37,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1313048249] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:53:37,259 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:53:37,260 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 04:53:37,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5442623] [2022-12-14 04:53:37,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:53:37,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 04:53:37,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:53:37,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 04:53:37,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 04:53:37,286 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:37,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:53:37,308 INFO L93 Difference]: Finished difference Result 54 states and 86 transitions. [2022-12-14 04:53:37,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 04:53:37,310 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-12-14 04:53:37,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:53:37,316 INFO L225 Difference]: With dead ends: 54 [2022-12-14 04:53:37,316 INFO L226 Difference]: Without dead ends: 28 [2022-12-14 04:53:37,318 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 04:53:37,320 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:53:37,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:53:37,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-12-14 04:53:37,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-12-14 04:53:37,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 04:53:37,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-12-14 04:53:37,349 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 13 [2022-12-14 04:53:37,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:53:37,350 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-12-14 04:53:37,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:37,350 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-12-14 04:53:37,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 04:53:37,351 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:53:37,351 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:53:37,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 04:53:37,552 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-12-14 04:53:37,554 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:53:37,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:53:37,556 INFO L85 PathProgramCache]: Analyzing trace with hash -828509657, now seen corresponding path program 1 times [2022-12-14 04:53:37,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:53:37,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359141517] [2022-12-14 04:53:37,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:37,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:53:37,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:37,655 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:53:37,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359141517] [2022-12-14 04:53:37,657 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-12-14 04:53:37,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853716197] [2022-12-14 04:53:37,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:37,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:37,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:37,662 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:53:37,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 04:53:37,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:37,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 04:53:37,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:53:37,796 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:53:37,796 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 04:53:37,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853716197] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:53:37,796 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:53:37,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 04:53:37,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244763809] [2022-12-14 04:53:37,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:53:37,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 04:53:37,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:53:37,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 04:53:37,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 04:53:37,799 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:37,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:53:37,817 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2022-12-14 04:53:37,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 04:53:37,818 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-12-14 04:53:37,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:53:37,818 INFO L225 Difference]: With dead ends: 37 [2022-12-14 04:53:37,818 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 04:53:37,819 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 04:53:37,819 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:53:37,820 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 94 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:53:37,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 04:53:37,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-12-14 04:53:37,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 04:53:37,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2022-12-14 04:53:37,825 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2022-12-14 04:53:37,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:53:37,825 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2022-12-14 04:53:37,825 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:37,825 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2022-12-14 04:53:37,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 04:53:37,826 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:53:37,826 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:53:37,830 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 04:53:38,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:38,028 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:53:38,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:53:38,030 INFO L85 PathProgramCache]: Analyzing trace with hash 66369279, now seen corresponding path program 1 times [2022-12-14 04:53:38,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:53:38,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39980252] [2022-12-14 04:53:38,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:38,032 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:53:38,077 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:53:38,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1152051769] [2022-12-14 04:53:38,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:38,078 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:38,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:38,081 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:53:38,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 04:53:38,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:38,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 04:53:38,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:53:38,247 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 04:53:38,247 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 04:53:38,248 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:53:38,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39980252] [2022-12-14 04:53:38,248 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:53:38,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152051769] [2022-12-14 04:53:38,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152051769] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:53:38,248 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:53:38,248 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 04:53:38,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625684360] [2022-12-14 04:53:38,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:53:38,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 04:53:38,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:53:38,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 04:53:38,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 04:53:38,250 INFO L87 Difference]: Start difference. First operand 30 states and 40 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:38,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:53:38,308 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2022-12-14 04:53:38,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 04:53:38,308 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2022-12-14 04:53:38,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:53:38,309 INFO L225 Difference]: With dead ends: 50 [2022-12-14 04:53:38,309 INFO L226 Difference]: Without dead ends: 43 [2022-12-14 04:53:38,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-12-14 04:53:38,310 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 45 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:53:38,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 88 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:53:38,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-12-14 04:53:38,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2022-12-14 04:53:38,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 04:53:38,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-12-14 04:53:38,316 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 15 [2022-12-14 04:53:38,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:53:38,316 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-12-14 04:53:38,316 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:38,316 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-12-14 04:53:38,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 04:53:38,317 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:53:38,317 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:53:38,322 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 04:53:38,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:38,519 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:53:38,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:53:38,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1737104877, now seen corresponding path program 1 times [2022-12-14 04:53:38,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:53:38,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290615669] [2022-12-14 04:53:38,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:38,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:53:38,560 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:53:38,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [280402063] [2022-12-14 04:53:38,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:38,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:38,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:38,565 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:53:38,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 04:53:38,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:38,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 04:53:38,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:53:38,760 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:53:38,760 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 04:53:38,760 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:53:38,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290615669] [2022-12-14 04:53:38,760 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:53:38,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280402063] [2022-12-14 04:53:38,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280402063] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:53:38,761 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:53:38,761 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 04:53:38,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288769155] [2022-12-14 04:53:38,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:53:38,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 04:53:38,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:53:38,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 04:53:38,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 04:53:38,763 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:38,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:53:38,783 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2022-12-14 04:53:38,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 04:53:38,784 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2022-12-14 04:53:38,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:53:38,784 INFO L225 Difference]: With dead ends: 55 [2022-12-14 04:53:38,784 INFO L226 Difference]: Without dead ends: 33 [2022-12-14 04:53:38,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 04:53:38,785 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:53:38,786 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:53:38,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-12-14 04:53:38,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-12-14 04:53:38,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 04:53:38,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-12-14 04:53:38,790 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 20 [2022-12-14 04:53:38,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:53:38,790 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-12-14 04:53:38,790 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:38,790 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-12-14 04:53:38,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 04:53:38,791 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:53:38,791 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:53:38,795 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 04:53:38,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-12-14 04:53:38,993 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:53:38,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:53:38,994 INFO L85 PathProgramCache]: Analyzing trace with hash 148941760, now seen corresponding path program 1 times [2022-12-14 04:53:38,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:53:38,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813827772] [2022-12-14 04:53:38,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:38,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:53:39,060 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:53:39,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1652450344] [2022-12-14 04:53:39,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:39,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:39,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:39,066 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:53:39,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 04:53:39,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:39,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 04:53:39,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:53:39,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 04:53:39,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 04:53:39,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:53:39,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813827772] [2022-12-14 04:53:39,310 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:53:39,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652450344] [2022-12-14 04:53:39,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652450344] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:53:39,310 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:53:39,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 04:53:39,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565835496] [2022-12-14 04:53:39,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:53:39,311 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 04:53:39,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:53:39,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 04:53:39,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-12-14 04:53:39,312 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:39,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:53:39,386 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2022-12-14 04:53:39,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 04:53:39,386 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2022-12-14 04:53:39,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:53:39,387 INFO L225 Difference]: With dead ends: 51 [2022-12-14 04:53:39,387 INFO L226 Difference]: Without dead ends: 49 [2022-12-14 04:53:39,388 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-12-14 04:53:39,388 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 53 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:53:39,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 131 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 04:53:39,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-12-14 04:53:39,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2022-12-14 04:53:39,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 34 states have internal predecessors, (44), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-12-14 04:53:39,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2022-12-14 04:53:39,400 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 20 [2022-12-14 04:53:39,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:53:39,400 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2022-12-14 04:53:39,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 04:53:39,400 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2022-12-14 04:53:39,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 04:53:39,401 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:53:39,401 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:53:39,407 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 04:53:39,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:39,602 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:53:39,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:53:39,602 INFO L85 PathProgramCache]: Analyzing trace with hash -1894324762, now seen corresponding path program 1 times [2022-12-14 04:53:39,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:53:39,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238237313] [2022-12-14 04:53:39,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:39,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:53:39,615 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:53:39,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1512658136] [2022-12-14 04:53:39,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:39,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:39,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:39,616 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:53:39,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 04:53:39,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:39,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 04:53:39,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:53:39,699 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:53:39,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:53:39,749 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:53:39,749 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:53:39,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238237313] [2022-12-14 04:53:39,749 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:53:39,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512658136] [2022-12-14 04:53:39,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512658136] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:53:39,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [509365742] [2022-12-14 04:53:39,764 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-12-14 04:53:39,764 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:53:39,767 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:53:39,772 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:53:39,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:53:40,302 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:53:40,326 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:53:42,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [509365742] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:53:42,039 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:53:42,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 6] total 22 [2022-12-14 04:53:42,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961624256] [2022-12-14 04:53:42,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:53:42,040 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 04:53:42,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:53:42,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 04:53:42,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2022-12-14 04:53:42,041 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 04:53:43,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:53:43,079 INFO L93 Difference]: Finished difference Result 88 states and 125 transitions. [2022-12-14 04:53:43,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 04:53:43,079 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-12-14 04:53:43,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:53:43,080 INFO L225 Difference]: With dead ends: 88 [2022-12-14 04:53:43,080 INFO L226 Difference]: Without dead ends: 66 [2022-12-14 04:53:43,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=176, Invalid=580, Unknown=0, NotChecked=0, Total=756 [2022-12-14 04:53:43,081 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 04:53:43,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 145 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 04:53:43,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-12-14 04:53:43,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2022-12-14 04:53:43,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 42 states have internal predecessors, (54), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-12-14 04:53:43,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 75 transitions. [2022-12-14 04:53:43,091 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 75 transitions. Word has length 21 [2022-12-14 04:53:43,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:53:43,092 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 75 transitions. [2022-12-14 04:53:43,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 04:53:43,092 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 75 transitions. [2022-12-14 04:53:43,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 04:53:43,092 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:53:43,092 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:53:43,098 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 04:53:43,293 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 04:53:43,294 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:53:43,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:53:43,295 INFO L85 PathProgramCache]: Analyzing trace with hash -1377591568, now seen corresponding path program 1 times [2022-12-14 04:53:43,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:53:43,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412853441] [2022-12-14 04:53:43,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:43,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:53:43,305 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:53:43,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [489381320] [2022-12-14 04:53:43,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:43,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:43,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:43,307 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:53:43,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 04:53:43,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:43,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 27 conjunts are in the unsatisfiable core [2022-12-14 04:53:43,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:53:43,575 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 04:53:43,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:53:43,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:53:43,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412853441] [2022-12-14 04:53:43,678 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:53:43,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489381320] [2022-12-14 04:53:43,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [489381320] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 04:53:43,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1761085993] [2022-12-14 04:53:43,679 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-12-14 04:53:43,680 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:53:43,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:53:43,680 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:53:43,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:53:43,879 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-12-14 04:53:43,886 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:53:43,910 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:53:45,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1761085993] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:53:45,258 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 04:53:45,258 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [13] total 29 [2022-12-14 04:53:45,259 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969125519] [2022-12-14 04:53:45,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:53:45,259 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 04:53:45,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:53:45,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 04:53:45,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-12-14 04:53:45,260 INFO L87 Difference]: Start difference. First operand 56 states and 75 transitions. Second operand has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 04:53:45,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:53:45,498 INFO L93 Difference]: Finished difference Result 110 states and 150 transitions. [2022-12-14 04:53:45,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 04:53:45,499 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 25 [2022-12-14 04:53:45,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:53:45,499 INFO L225 Difference]: With dead ends: 110 [2022-12-14 04:53:45,499 INFO L226 Difference]: Without dead ends: 73 [2022-12-14 04:53:45,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-12-14 04:53:45,500 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 2 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 04:53:45,500 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 123 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 04:53:45,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-12-14 04:53:45,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2022-12-14 04:53:45,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.2653061224489797) internal successors, (62), 51 states have internal predecessors, (62), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-12-14 04:53:45,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2022-12-14 04:53:45,512 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 25 [2022-12-14 04:53:45,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:53:45,513 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2022-12-14 04:53:45,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 04:53:45,513 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2022-12-14 04:53:45,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 04:53:45,513 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:53:45,513 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:53:45,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 04:53:45,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:45,715 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:53:45,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:53:45,716 INFO L85 PathProgramCache]: Analyzing trace with hash -1856138177, now seen corresponding path program 1 times [2022-12-14 04:53:45,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:53:45,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803262609] [2022-12-14 04:53:45,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:45,717 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:53:45,743 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:53:45,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1440581374] [2022-12-14 04:53:45,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:45,745 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:45,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:45,747 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:53:45,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 04:53:45,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:45,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 29 conjunts are in the unsatisfiable core [2022-12-14 04:53:45,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:53:45,920 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 04:53:45,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:53:45,984 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 04:53:45,984 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:53:45,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803262609] [2022-12-14 04:53:45,984 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:53:45,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440581374] [2022-12-14 04:53:45,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440581374] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:53:45,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1147641608] [2022-12-14 04:53:45,986 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-12-14 04:53:45,987 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:53:45,987 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:53:45,987 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:53:45,987 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:53:46,555 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2022-12-14 04:53:46,568 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:53:46,584 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:53:49,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1147641608] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:53:49,649 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:53:49,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [9, 6] total 30 [2022-12-14 04:53:49,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352533353] [2022-12-14 04:53:49,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:53:49,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 04:53:49,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:53:49,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 04:53:49,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2022-12-14 04:53:49,650 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 04:53:51,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:53:51,451 INFO L93 Difference]: Finished difference Result 108 states and 145 transitions. [2022-12-14 04:53:51,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 04:53:51,451 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2022-12-14 04:53:51,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:53:51,452 INFO L225 Difference]: With dead ends: 108 [2022-12-14 04:53:51,452 INFO L226 Difference]: Without dead ends: 86 [2022-12-14 04:53:51,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=192, Invalid=1290, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 04:53:51,453 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 04:53:51,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 154 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 04:53:51,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-12-14 04:53:51,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2022-12-14 04:53:51,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.2407407407407407) internal successors, (67), 57 states have internal predecessors, (67), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-12-14 04:53:51,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 104 transitions. [2022-12-14 04:53:51,467 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 104 transitions. Word has length 27 [2022-12-14 04:53:51,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:53:51,467 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 104 transitions. [2022-12-14 04:53:51,467 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 04:53:51,467 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 104 transitions. [2022-12-14 04:53:51,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 04:53:51,468 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:53:51,468 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:53:51,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-12-14 04:53:51,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:51,670 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:53:51,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:53:51,671 INFO L85 PathProgramCache]: Analyzing trace with hash -301475410, now seen corresponding path program 1 times [2022-12-14 04:53:51,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:53:51,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041894526] [2022-12-14 04:53:51,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:51,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:53:51,701 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:53:51,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1529196758] [2022-12-14 04:53:51,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:53:51,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:53:51,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:53:51,705 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:53:51,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 04:53:51,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:53:51,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 04:53:51,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:53:51,817 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 04:53:51,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:53:51,864 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 04:53:51,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:53:51,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041894526] [2022-12-14 04:53:51,865 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:53:51,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529196758] [2022-12-14 04:53:51,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529196758] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:53:51,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1738277502] [2022-12-14 04:53:51,867 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-12-14 04:53:51,867 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:53:51,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:53:51,868 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:53:51,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:53:56,879 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-12-14 04:53:56,885 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:53:56,902 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:54:00,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1738277502] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:54:00,545 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:54:00,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [6, 7] total 29 [2022-12-14 04:54:00,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704631127] [2022-12-14 04:54:00,545 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:54:00,546 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 04:54:00,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:54:00,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 04:54:00,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=607, Unknown=0, NotChecked=0, Total=812 [2022-12-14 04:54:00,546 INFO L87 Difference]: Start difference. First operand 80 states and 104 transitions. Second operand has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-12-14 04:54:01,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:54:01,029 INFO L93 Difference]: Finished difference Result 138 states and 185 transitions. [2022-12-14 04:54:01,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 04:54:01,030 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2022-12-14 04:54:01,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:54:01,031 INFO L225 Difference]: With dead ends: 138 [2022-12-14 04:54:01,031 INFO L226 Difference]: Without dead ends: 101 [2022-12-14 04:54:01,032 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=216, Invalid=654, Unknown=0, NotChecked=0, Total=870 [2022-12-14 04:54:01,032 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 2 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 04:54:01,032 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 116 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 04:54:01,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-12-14 04:54:01,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 85. [2022-12-14 04:54:01,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 61 states have internal predecessors, (74), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-12-14 04:54:01,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 111 transitions. [2022-12-14 04:54:01,047 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 111 transitions. Word has length 47 [2022-12-14 04:54:01,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:54:01,047 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 111 transitions. [2022-12-14 04:54:01,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-12-14 04:54:01,047 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 111 transitions. [2022-12-14 04:54:01,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-12-14 04:54:01,048 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:54:01,048 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-12-14 04:54:01,052 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 04:54:01,248 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-12-14 04:54:01,250 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:54:01,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:54:01,251 INFO L85 PathProgramCache]: Analyzing trace with hash 170701079, now seen corresponding path program 1 times [2022-12-14 04:54:01,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:54:01,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807138319] [2022-12-14 04:54:01,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:54:01,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:54:01,277 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:54:01,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1367220573] [2022-12-14 04:54:01,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:54:01,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:54:01,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:54:01,280 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:54:01,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 04:54:01,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:54:01,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 04:54:01,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:54:01,357 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 04:54:01,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:54:01,409 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 04:54:01,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:54:01,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807138319] [2022-12-14 04:54:01,409 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:54:01,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367220573] [2022-12-14 04:54:01,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367220573] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:54:01,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1224262889] [2022-12-14 04:54:01,412 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 04:54:01,412 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:54:01,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:54:01,412 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:54:01,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:54:05,623 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2022-12-14 04:54:05,655 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:54:05,672 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:54:08,043 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3013#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 04:54:08,043 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:54:08,043 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:54:08,043 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-12-14 04:54:08,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482580547] [2022-12-14 04:54:08,044 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 04:54:08,044 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 04:54:08,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:54:08,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 04:54:08,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2022-12-14 04:54:08,045 INFO L87 Difference]: Start difference. First operand 85 states and 111 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-12-14 04:54:08,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:54:08,150 INFO L93 Difference]: Finished difference Result 105 states and 134 transitions. [2022-12-14 04:54:08,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 04:54:08,151 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2022-12-14 04:54:08,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:54:08,151 INFO L225 Difference]: With dead ends: 105 [2022-12-14 04:54:08,151 INFO L226 Difference]: Without dead ends: 103 [2022-12-14 04:54:08,152 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 04:54:08,152 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 24 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:54:08,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 84 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:54:08,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-12-14 04:54:08,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2022-12-14 04:54:08,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 71 states have (on average 1.2535211267605635) internal successors, (89), 74 states have internal predecessors, (89), 21 states have call successors, (21), 8 states have call predecessors, (21), 8 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2022-12-14 04:54:08,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 130 transitions. [2022-12-14 04:54:08,168 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 130 transitions. Word has length 48 [2022-12-14 04:54:08,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:54:08,169 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 130 transitions. [2022-12-14 04:54:08,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-12-14 04:54:08,169 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 130 transitions. [2022-12-14 04:54:08,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-12-14 04:54:08,170 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:54:08,170 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:54:08,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 04:54:08,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 04:54:08,371 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:54:08,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:54:08,372 INFO L85 PathProgramCache]: Analyzing trace with hash -339484245, now seen corresponding path program 1 times [2022-12-14 04:54:08,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:54:08,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689589871] [2022-12-14 04:54:08,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:54:08,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:54:08,383 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:54:08,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1870697246] [2022-12-14 04:54:08,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:54:08,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:54:08,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:54:08,385 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:54:08,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 04:54:08,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:54:08,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 04:54:08,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:54:08,481 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 04:54:08,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:54:08,548 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 04:54:08,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:54:08,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689589871] [2022-12-14 04:54:08,548 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:54:08,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870697246] [2022-12-14 04:54:08,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870697246] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:54:08,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1431349883] [2022-12-14 04:54:08,550 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-12-14 04:54:08,550 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:54:08,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:54:08,551 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:54:08,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:54:12,604 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-12-14 04:54:16,114 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-12-14 04:54:16,173 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:54:16,192 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:54:33,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3627#(and (<= ~counter~0 52) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0))' at error location [2022-12-14 04:54:33,069 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:54:33,069 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:54:33,069 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-12-14 04:54:33,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142759267] [2022-12-14 04:54:33,069 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 04:54:33,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 04:54:33,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:54:33,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 04:54:33,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 04:54:33,071 INFO L87 Difference]: Start difference. First operand 101 states and 130 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 04:54:33,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:54:33,313 INFO L93 Difference]: Finished difference Result 508 states and 648 transitions. [2022-12-14 04:54:33,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 04:54:33,313 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 48 [2022-12-14 04:54:33,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:54:33,316 INFO L225 Difference]: With dead ends: 508 [2022-12-14 04:54:33,316 INFO L226 Difference]: Without dead ends: 501 [2022-12-14 04:54:33,317 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=302, Invalid=1590, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 04:54:33,318 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 211 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:54:33,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 392 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 04:54:33,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2022-12-14 04:54:33,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 390. [2022-12-14 04:54:33,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 274 states have (on average 1.27007299270073) internal successors, (348), 284 states have internal predecessors, (348), 81 states have call successors, (81), 34 states have call predecessors, (81), 34 states have return successors, (76), 71 states have call predecessors, (76), 76 states have call successors, (76) [2022-12-14 04:54:33,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 505 transitions. [2022-12-14 04:54:33,389 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 505 transitions. Word has length 48 [2022-12-14 04:54:33,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:54:33,390 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 505 transitions. [2022-12-14 04:54:33,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 04:54:33,390 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 505 transitions. [2022-12-14 04:54:33,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-12-14 04:54:33,391 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:54:33,392 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:54:33,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-12-14 04:54:33,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:54:33,593 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:54:33,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:54:33,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1953712133, now seen corresponding path program 1 times [2022-12-14 04:54:33,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:54:33,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781629034] [2022-12-14 04:54:33,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:54:33,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:54:33,629 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:54:33,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1971824875] [2022-12-14 04:54:33,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:54:33,629 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:54:33,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:54:33,631 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:54:33,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 04:54:33,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:54:33,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 04:54:33,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:54:34,188 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-12-14 04:54:34,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:54:34,910 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-12-14 04:54:34,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:54:34,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781629034] [2022-12-14 04:54:34,911 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:54:34,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1971824875] [2022-12-14 04:54:34,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1971824875] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:54:34,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [897239547] [2022-12-14 04:54:34,913 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-12-14 04:54:34,913 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:54:34,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:54:34,914 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:54:34,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:54:38,528 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-12-14 04:54:41,410 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 04:54:41,414 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:54:41,438 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:55:04,522 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5255#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 04:55:04,522 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:55:04,522 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:55:04,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2022-12-14 04:55:04,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283540713] [2022-12-14 04:55:04,522 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 04:55:04,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 04:55:04,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:55:04,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 04:55:04,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=2014, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 04:55:04,523 INFO L87 Difference]: Start difference. First operand 390 states and 505 transitions. Second operand has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 04:55:15,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:55:15,162 INFO L93 Difference]: Finished difference Result 845 states and 1155 transitions. [2022-12-14 04:55:15,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 04:55:15,162 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 49 [2022-12-14 04:55:15,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:55:15,164 INFO L225 Difference]: With dead ends: 845 [2022-12-14 04:55:15,164 INFO L226 Difference]: Without dead ends: 641 [2022-12-14 04:55:15,166 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 29.4s TimeCoverageRelationStatistics Valid=670, Invalid=5030, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 04:55:15,166 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 279 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 1535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-12-14 04:55:15,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [285 Valid, 459 Invalid, 1535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 1295 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-12-14 04:55:15,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2022-12-14 04:55:15,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 501. [2022-12-14 04:55:15,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 364 states have (on average 1.3104395604395604) internal successors, (477), 371 states have internal predecessors, (477), 101 states have call successors, (101), 35 states have call predecessors, (101), 35 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-12-14 04:55:15,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 676 transitions. [2022-12-14 04:55:15,287 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 676 transitions. Word has length 49 [2022-12-14 04:55:15,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:55:15,288 INFO L495 AbstractCegarLoop]: Abstraction has 501 states and 676 transitions. [2022-12-14 04:55:15,288 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 04:55:15,288 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 676 transitions. [2022-12-14 04:55:15,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 04:55:15,289 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:55:15,289 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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] [2022-12-14 04:55:15,294 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 04:55:15,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:55:15,491 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:55:15,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:55:15,491 INFO L85 PathProgramCache]: Analyzing trace with hash -324758054, now seen corresponding path program 1 times [2022-12-14 04:55:15,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:55:15,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130583288] [2022-12-14 04:55:15,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:55:15,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:55:15,514 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:55:15,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1838321138] [2022-12-14 04:55:15,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:55:15,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:55:15,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:55:15,518 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:55:15,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 04:55:15,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:55:15,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 04:55:15,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:55:15,619 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-12-14 04:55:15,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:55:15,658 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-12-14 04:55:15,658 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:55:15,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130583288] [2022-12-14 04:55:15,658 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:55:15,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838321138] [2022-12-14 04:55:15,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838321138] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:55:15,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1829251860] [2022-12-14 04:55:15,660 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-12-14 04:55:15,660 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:55:15,660 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:55:15,660 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:55:15,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:55:21,760 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-12-14 04:55:21,808 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:55:21,823 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:55:25,303 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7559#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 04:55:25,303 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:55:25,303 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:55:25,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-12-14 04:55:25,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933770758] [2022-12-14 04:55:25,304 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 04:55:25,304 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-12-14 04:55:25,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:55:25,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-12-14 04:55:25,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=880, Unknown=0, NotChecked=0, Total=992 [2022-12-14 04:55:25,305 INFO L87 Difference]: Start difference. First operand 501 states and 676 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 04:55:25,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:55:25,567 INFO L93 Difference]: Finished difference Result 533 states and 705 transitions. [2022-12-14 04:55:25,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 04:55:25,568 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 50 [2022-12-14 04:55:25,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:55:25,572 INFO L225 Difference]: With dead ends: 533 [2022-12-14 04:55:25,572 INFO L226 Difference]: Without dead ends: 531 [2022-12-14 04:55:25,573 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=128, Invalid=994, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 04:55:25,573 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:55:25,574 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 131 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:55:25,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2022-12-14 04:55:25,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 525. [2022-12-14 04:55:25,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 382 states have (on average 1.2958115183246073) internal successors, (495), 389 states have internal predecessors, (495), 101 states have call successors, (101), 41 states have call predecessors, (101), 41 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-12-14 04:55:25,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 694 transitions. [2022-12-14 04:55:25,695 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 694 transitions. Word has length 50 [2022-12-14 04:55:25,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:55:25,696 INFO L495 AbstractCegarLoop]: Abstraction has 525 states and 694 transitions. [2022-12-14 04:55:25,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 04:55:25,696 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 694 transitions. [2022-12-14 04:55:25,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-12-14 04:55:25,696 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:55:25,696 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 3, 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] [2022-12-14 04:55:25,701 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 04:55:25,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 04:55:25,898 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:55:25,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:55:25,899 INFO L85 PathProgramCache]: Analyzing trace with hash -1947795252, now seen corresponding path program 1 times [2022-12-14 04:55:25,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:55:25,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032840516] [2022-12-14 04:55:25,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:55:25,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:55:25,913 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:55:25,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1847265142] [2022-12-14 04:55:25,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:55:25,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:55:25,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:55:25,915 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:55:25,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 04:55:25,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:55:25,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 04:55:25,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:55:25,987 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 04:55:25,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:55:26,032 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 04:55:26,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:55:26,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032840516] [2022-12-14 04:55:26,033 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:55:26,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847265142] [2022-12-14 04:55:26,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847265142] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:55:26,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [216309735] [2022-12-14 04:55:26,034 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-12-14 04:55:26,035 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:55:26,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:55:26,035 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:55:26,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:55:43,664 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 04:55:43,668 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:55:43,685 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:55:46,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9414#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 04:55:46,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:55:46,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:55:46,677 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-12-14 04:55:46,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788300132] [2022-12-14 04:55:46,677 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 04:55:46,678 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 04:55:46,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:55:46,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 04:55:46,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1063, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 04:55:46,679 INFO L87 Difference]: Start difference. First operand 525 states and 694 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 04:55:46,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:55:46,985 INFO L93 Difference]: Finished difference Result 790 states and 1036 transitions. [2022-12-14 04:55:46,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 04:55:46,986 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 55 [2022-12-14 04:55:46,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:55:46,987 INFO L225 Difference]: With dead ends: 790 [2022-12-14 04:55:46,987 INFO L226 Difference]: Without dead ends: 528 [2022-12-14 04:55:46,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 602 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=239, Invalid=1401, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 04:55:46,988 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 112 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:55:46,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 252 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 04:55:46,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2022-12-14 04:55:47,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 503. [2022-12-14 04:55:47,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 363 states have (on average 1.2506887052341598) internal successors, (454), 368 states have internal predecessors, (454), 98 states have call successors, (98), 41 states have call predecessors, (98), 41 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-12-14 04:55:47,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 648 transitions. [2022-12-14 04:55:47,189 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 648 transitions. Word has length 55 [2022-12-14 04:55:47,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:55:47,190 INFO L495 AbstractCegarLoop]: Abstraction has 503 states and 648 transitions. [2022-12-14 04:55:47,190 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 04:55:47,190 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 648 transitions. [2022-12-14 04:55:47,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-12-14 04:55:47,191 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:55:47,191 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 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] [2022-12-14 04:55:47,196 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 04:55:47,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 04:55:47,392 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:55:47,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:55:47,392 INFO L85 PathProgramCache]: Analyzing trace with hash -897475049, now seen corresponding path program 2 times [2022-12-14 04:55:47,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:55:47,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622184325] [2022-12-14 04:55:47,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:55:47,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:55:47,400 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:55:47,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1751820427] [2022-12-14 04:55:47,401 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 04:55:47,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:55:47,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:55:47,402 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:55:47,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 04:55:47,439 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 04:55:47,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 04:55:47,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2022-12-14 04:55:47,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:55:47,523 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2022-12-14 04:55:47,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:55:47,591 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-12-14 04:55:47,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:55:47,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622184325] [2022-12-14 04:55:47,591 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:55:47,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751820427] [2022-12-14 04:55:47,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751820427] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 04:55:47,592 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 04:55:47,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 12 [2022-12-14 04:55:47,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505285176] [2022-12-14 04:55:47,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:55:47,592 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 04:55:47,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:55:47,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 04:55:47,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-12-14 04:55:47,593 INFO L87 Difference]: Start difference. First operand 503 states and 648 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 04:55:47,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:55:47,780 INFO L93 Difference]: Finished difference Result 544 states and 686 transitions. [2022-12-14 04:55:47,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 04:55:47,781 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 58 [2022-12-14 04:55:47,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:55:47,782 INFO L225 Difference]: With dead ends: 544 [2022-12-14 04:55:47,782 INFO L226 Difference]: Without dead ends: 542 [2022-12-14 04:55:47,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-12-14 04:55:47,783 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 11 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:55:47,783 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 111 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:55:47,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2022-12-14 04:55:47,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 535. [2022-12-14 04:55:47,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 387 states have (on average 1.2299741602067182) internal successors, (476), 392 states have internal predecessors, (476), 98 states have call successors, (98), 49 states have call predecessors, (98), 49 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-12-14 04:55:47,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 670 transitions. [2022-12-14 04:55:47,899 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 670 transitions. Word has length 58 [2022-12-14 04:55:47,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:55:47,899 INFO L495 AbstractCegarLoop]: Abstraction has 535 states and 670 transitions. [2022-12-14 04:55:47,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 04:55:47,899 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 670 transitions. [2022-12-14 04:55:47,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 04:55:47,900 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:55:47,900 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:55:47,906 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 04:55:48,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:55:48,101 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:55:48,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:55:48,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1281872666, now seen corresponding path program 2 times [2022-12-14 04:55:48,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:55:48,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245861970] [2022-12-14 04:55:48,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:55:48,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:55:48,108 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:55:48,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [149295577] [2022-12-14 04:55:48,108 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 04:55:48,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:55:48,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:55:48,109 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:55:48,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 04:55:48,147 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 04:55:48,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 04:55:48,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 04:55:48,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:55:48,228 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 04:55:48,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:55:48,275 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-12-14 04:55:48,275 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:55:48,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245861970] [2022-12-14 04:55:48,275 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:55:48,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149295577] [2022-12-14 04:55:48,275 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149295577] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 04:55:48,275 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 04:55:48,275 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2022-12-14 04:55:48,275 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823763399] [2022-12-14 04:55:48,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:55:48,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 04:55:48,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:55:48,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 04:55:48,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2022-12-14 04:55:48,276 INFO L87 Difference]: Start difference. First operand 535 states and 670 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 04:55:48,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:55:48,461 INFO L93 Difference]: Finished difference Result 613 states and 770 transitions. [2022-12-14 04:55:48,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 04:55:48,462 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 60 [2022-12-14 04:55:48,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:55:48,466 INFO L225 Difference]: With dead ends: 613 [2022-12-14 04:55:48,466 INFO L226 Difference]: Without dead ends: 611 [2022-12-14 04:55:48,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-12-14 04:55:48,467 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 8 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:55:48,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 109 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:55:48,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2022-12-14 04:55:48,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 602. [2022-12-14 04:55:48,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 428 states have (on average 1.2289719626168225) internal successors, (526), 434 states have internal predecessors, (526), 116 states have call successors, (116), 57 states have call predecessors, (116), 57 states have return successors, (114), 110 states have call predecessors, (114), 114 states have call successors, (114) [2022-12-14 04:55:48,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 756 transitions. [2022-12-14 04:55:48,607 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 756 transitions. Word has length 60 [2022-12-14 04:55:48,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:55:48,607 INFO L495 AbstractCegarLoop]: Abstraction has 602 states and 756 transitions. [2022-12-14 04:55:48,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 04:55:48,608 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 756 transitions. [2022-12-14 04:55:48,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 04:55:48,608 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:55:48,608 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 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] [2022-12-14 04:55:48,613 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 04:55:48,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 04:55:48,809 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:55:48,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:55:48,810 INFO L85 PathProgramCache]: Analyzing trace with hash 1844245864, now seen corresponding path program 1 times [2022-12-14 04:55:48,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:55:48,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78798882] [2022-12-14 04:55:48,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:55:48,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:55:48,821 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:55:48,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1111445374] [2022-12-14 04:55:48,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:55:48,822 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:55:48,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:55:48,824 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:55:48,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 04:55:48,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:55:48,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 04:55:48,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:55:48,963 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 04:55:48,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:55:49,036 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 04:55:49,036 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:55:49,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78798882] [2022-12-14 04:55:49,036 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:55:49,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1111445374] [2022-12-14 04:55:49,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1111445374] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:55:49,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [366106775] [2022-12-14 04:55:49,038 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-12-14 04:55:49,038 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:55:49,038 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:55:49,038 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:55:49,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:55:52,690 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-12-14 04:55:56,266 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 04:55:56,269 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:55:56,283 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:56:12,603 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15591#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 04:56:12,603 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:56:12,603 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:56:12,603 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2022-12-14 04:56:12,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361687] [2022-12-14 04:56:12,603 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 04:56:12,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 04:56:12,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:56:12,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 04:56:12,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1151, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 04:56:12,604 INFO L87 Difference]: Start difference. First operand 602 states and 756 transitions. Second operand has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 04:56:13,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:56:13,188 INFO L93 Difference]: Finished difference Result 1248 states and 1622 transitions. [2022-12-14 04:56:13,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 04:56:13,188 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 60 [2022-12-14 04:56:13,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:56:13,195 INFO L225 Difference]: With dead ends: 1248 [2022-12-14 04:56:13,195 INFO L226 Difference]: Without dead ends: 1097 [2022-12-14 04:56:13,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 827 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=368, Invalid=1794, Unknown=0, NotChecked=0, Total=2162 [2022-12-14 04:56:13,197 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 217 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:56:13,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [217 Valid, 355 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 04:56:13,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1097 states. [2022-12-14 04:56:13,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1097 to 1030. [2022-12-14 04:56:13,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1030 states, 720 states have (on average 1.2166666666666666) internal successors, (876), 735 states have internal predecessors, (876), 219 states have call successors, (219), 90 states have call predecessors, (219), 90 states have return successors, (214), 204 states have call predecessors, (214), 214 states have call successors, (214) [2022-12-14 04:56:13,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1030 states to 1030 states and 1309 transitions. [2022-12-14 04:56:13,512 INFO L78 Accepts]: Start accepts. Automaton has 1030 states and 1309 transitions. Word has length 60 [2022-12-14 04:56:13,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:56:13,512 INFO L495 AbstractCegarLoop]: Abstraction has 1030 states and 1309 transitions. [2022-12-14 04:56:13,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 04:56:13,513 INFO L276 IsEmpty]: Start isEmpty. Operand 1030 states and 1309 transitions. [2022-12-14 04:56:13,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 04:56:13,514 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:56:13,514 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:56:13,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 04:56:13,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 04:56:13,716 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:56:13,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:56:13,717 INFO L85 PathProgramCache]: Analyzing trace with hash 186118403, now seen corresponding path program 1 times [2022-12-14 04:56:13,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:56:13,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1751859160] [2022-12-14 04:56:13,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:56:13,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:56:13,745 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:56:13,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [188359201] [2022-12-14 04:56:13,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:56:13,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:56:13,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:56:13,750 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:56:13,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 04:56:13,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:56:13,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 04:56:13,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:56:14,344 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-12-14 04:56:14,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:56:14,752 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-12-14 04:56:14,752 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:56:14,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1751859160] [2022-12-14 04:56:14,752 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:56:14,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188359201] [2022-12-14 04:56:14,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188359201] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:56:14,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [968056495] [2022-12-14 04:56:14,754 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-12-14 04:56:14,754 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:56:14,754 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:56:14,754 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:56:14,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:56:18,477 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-12-14 04:56:22,096 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 04:56:22,099 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:56:22,113 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:56:40,129 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19262#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 04:56:40,129 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:56:40,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:56:40,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2022-12-14 04:56:40,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470220146] [2022-12-14 04:56:40,130 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 04:56:40,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 04:56:40,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:56:40,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 04:56:40,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1708, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 04:56:40,131 INFO L87 Difference]: Start difference. First operand 1030 states and 1309 transitions. Second operand has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 04:57:20,713 WARN L233 SmtUtils]: Spent 6.04s on a formula simplification. DAG size of input: 35 DAG size of output: 30 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 04:57:52,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:57:52,894 INFO L93 Difference]: Finished difference Result 1748 states and 2329 transitions. [2022-12-14 04:57:52,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-12-14 04:57:52,894 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 61 [2022-12-14 04:57:52,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:57:52,898 INFO L225 Difference]: With dead ends: 1748 [2022-12-14 04:57:52,898 INFO L226 Difference]: Without dead ends: 1420 [2022-12-14 04:57:52,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 159 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1873 ImplicationChecksByTransitivity, 68.1s TimeCoverageRelationStatistics Valid=687, Invalid=5633, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 04:57:52,900 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 293 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 1447 mSolverCounterSat, 298 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 696 SdHoareTripleChecker+Invalid, 1745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 298 IncrementalHoareTripleChecker+Valid, 1447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.8s IncrementalHoareTripleChecker+Time [2022-12-14 04:57:52,900 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [297 Valid, 696 Invalid, 1745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [298 Valid, 1447 Invalid, 0 Unknown, 0 Unchecked, 22.8s Time] [2022-12-14 04:57:52,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2022-12-14 04:57:53,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 1146. [2022-12-14 04:57:53,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1146 states, 813 states have (on average 1.2533825338253382) internal successors, (1019), 835 states have internal predecessors, (1019), 247 states have call successors, (247), 85 states have call predecessors, (247), 85 states have return successors, (242), 225 states have call predecessors, (242), 242 states have call successors, (242) [2022-12-14 04:57:53,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1146 states to 1146 states and 1508 transitions. [2022-12-14 04:57:53,273 INFO L78 Accepts]: Start accepts. Automaton has 1146 states and 1508 transitions. Word has length 61 [2022-12-14 04:57:53,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:57:53,273 INFO L495 AbstractCegarLoop]: Abstraction has 1146 states and 1508 transitions. [2022-12-14 04:57:53,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 04:57:53,273 INFO L276 IsEmpty]: Start isEmpty. Operand 1146 states and 1508 transitions. [2022-12-14 04:57:53,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 04:57:53,274 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:57:53,274 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:57:53,280 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 04:57:53,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:57:53,475 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:57:53,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:57:53,475 INFO L85 PathProgramCache]: Analyzing trace with hash 1039137595, now seen corresponding path program 2 times [2022-12-14 04:57:53,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:57:53,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419699336] [2022-12-14 04:57:53,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:57:53,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:57:53,480 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:57:53,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [19957995] [2022-12-14 04:57:53,481 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 04:57:53,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:57:53,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:57:53,482 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:57:53,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 04:57:53,526 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 04:57:53,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 04:57:53,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 04:57:53,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:57:53,541 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-12-14 04:57:53,542 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 04:57:53,542 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:57:53,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419699336] [2022-12-14 04:57:53,542 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:57:53,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19957995] [2022-12-14 04:57:53,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19957995] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:57:53,542 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:57:53,542 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 04:57:53,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821092197] [2022-12-14 04:57:53,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:57:53,543 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 04:57:53,543 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:57:53,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 04:57:53,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 04:57:53,543 INFO L87 Difference]: Start difference. First operand 1146 states and 1508 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 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) [2022-12-14 04:57:53,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:57:53,922 INFO L93 Difference]: Finished difference Result 1441 states and 1900 transitions. [2022-12-14 04:57:53,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 04:57:53,923 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 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 61 [2022-12-14 04:57:53,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:57:53,926 INFO L225 Difference]: With dead ends: 1441 [2022-12-14 04:57:53,926 INFO L226 Difference]: Without dead ends: 1209 [2022-12-14 04:57:53,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-12-14 04:57:53,927 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 30 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 04:57:53,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 137 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 04:57:53,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1209 states. [2022-12-14 04:57:54,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1209 to 1010. [2022-12-14 04:57:54,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1010 states, 719 states have (on average 1.228094575799722) internal successors, (883), 732 states have internal predecessors, (883), 205 states have call successors, (205), 85 states have call predecessors, (205), 85 states have return successors, (200), 192 states have call predecessors, (200), 200 states have call successors, (200) [2022-12-14 04:57:54,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1010 states to 1010 states and 1288 transitions. [2022-12-14 04:57:54,189 INFO L78 Accepts]: Start accepts. Automaton has 1010 states and 1288 transitions. Word has length 61 [2022-12-14 04:57:54,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:57:54,189 INFO L495 AbstractCegarLoop]: Abstraction has 1010 states and 1288 transitions. [2022-12-14 04:57:54,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 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) [2022-12-14 04:57:54,189 INFO L276 IsEmpty]: Start isEmpty. Operand 1010 states and 1288 transitions. [2022-12-14 04:57:54,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-12-14 04:57:54,190 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:57:54,190 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:57:54,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-12-14 04:57:54,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:57:54,391 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:57:54,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:57:54,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1945599548, now seen corresponding path program 3 times [2022-12-14 04:57:54,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:57:54,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680790213] [2022-12-14 04:57:54,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:57:54,394 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:57:54,413 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:57:54,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1034631522] [2022-12-14 04:57:54,413 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 04:57:54,414 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:57:54,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:57:54,414 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:57:54,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 04:57:54,452 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 04:57:54,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 04:57:54,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 04:57:54,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:57:54,477 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-12-14 04:57:54,477 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 04:57:54,477 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:57:54,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680790213] [2022-12-14 04:57:54,478 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:57:54,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034631522] [2022-12-14 04:57:54,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034631522] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 04:57:54,478 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 04:57:54,478 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 04:57:54,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751166897] [2022-12-14 04:57:54,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 04:57:54,478 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 04:57:54,478 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:57:54,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 04:57:54,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 04:57:54,479 INFO L87 Difference]: Start difference. First operand 1010 states and 1288 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-12-14 04:57:54,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:57:54,894 INFO L93 Difference]: Finished difference Result 1627 states and 2121 transitions. [2022-12-14 04:57:54,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 04:57:54,895 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 64 [2022-12-14 04:57:54,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:57:54,902 INFO L225 Difference]: With dead ends: 1627 [2022-12-14 04:57:54,902 INFO L226 Difference]: Without dead ends: 1176 [2022-12-14 04:57:54,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-12-14 04:57:54,903 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 11 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 04:57:54,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 116 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 04:57:54,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1176 states. [2022-12-14 04:57:55,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1176 to 1126. [2022-12-14 04:57:55,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 787 states have (on average 1.2325285895806861) internal successors, (970), 796 states have internal predecessors, (970), 253 states have call successors, (253), 85 states have call predecessors, (253), 85 states have return successors, (248), 244 states have call predecessors, (248), 248 states have call successors, (248) [2022-12-14 04:57:55,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1471 transitions. [2022-12-14 04:57:55,294 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1471 transitions. Word has length 64 [2022-12-14 04:57:55,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:57:55,294 INFO L495 AbstractCegarLoop]: Abstraction has 1126 states and 1471 transitions. [2022-12-14 04:57:55,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-12-14 04:57:55,294 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1471 transitions. [2022-12-14 04:57:55,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-12-14 04:57:55,295 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:57:55,295 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:57:55,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 04:57:55,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:57:55,496 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:57:55,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:57:55,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1497093235, now seen corresponding path program 4 times [2022-12-14 04:57:55,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:57:55,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715638124] [2022-12-14 04:57:55,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:57:55,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:57:55,510 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:57:55,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1077051791] [2022-12-14 04:57:55,511 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 04:57:55,511 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:57:55,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:57:55,513 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:57:55,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 04:57:55,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:57:55,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 68 conjunts are in the unsatisfiable core [2022-12-14 04:57:55,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:57:56,168 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-12-14 04:57:56,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:57:57,695 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 26 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 04:57:57,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:57:57,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715638124] [2022-12-14 04:57:57,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:57:57,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077051791] [2022-12-14 04:57:57,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077051791] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:57:57,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602054688] [2022-12-14 04:57:57,696 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-12-14 04:57:57,696 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:57:57,696 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:57:57,697 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:57:57,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:58:01,192 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-12-14 04:58:04,052 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 04:58:04,056 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:58:04,074 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:58:26,509 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31791#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 04:58:26,509 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:58:26,509 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:58:26,509 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 28 [2022-12-14 04:58:26,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120695933] [2022-12-14 04:58:26,510 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 04:58:26,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 04:58:26,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:58:26,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 04:58:26,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=2173, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 04:58:26,512 INFO L87 Difference]: Start difference. First operand 1126 states and 1471 transitions. Second operand has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-12-14 04:59:19,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:59:19,308 INFO L93 Difference]: Finished difference Result 1694 states and 2285 transitions. [2022-12-14 04:59:19,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 04:59:19,309 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) Word has length 66 [2022-12-14 04:59:19,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:59:19,313 INFO L225 Difference]: With dead ends: 1694 [2022-12-14 04:59:19,313 INFO L226 Difference]: Without dead ends: 1688 [2022-12-14 04:59:19,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2449 ImplicationChecksByTransitivity, 54.3s TimeCoverageRelationStatistics Valid=1107, Invalid=6549, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 04:59:19,314 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 461 mSDsluCounter, 800 mSDsCounter, 0 mSdLazyCounter, 1456 mSolverCounterSat, 431 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 461 SdHoareTripleChecker+Valid, 896 SdHoareTripleChecker+Invalid, 1887 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 431 IncrementalHoareTripleChecker+Valid, 1456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.7s IncrementalHoareTripleChecker+Time [2022-12-14 04:59:19,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [461 Valid, 896 Invalid, 1887 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [431 Valid, 1456 Invalid, 0 Unknown, 0 Unchecked, 21.7s Time] [2022-12-14 04:59:19,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1688 states. [2022-12-14 04:59:19,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1688 to 1430. [2022-12-14 04:59:19,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1430 states, 1014 states have (on average 1.2504930966469427) internal successors, (1268), 1022 states have internal predecessors, (1268), 310 states have call successors, (310), 106 states have call predecessors, (310), 105 states have return successors, (306), 301 states have call predecessors, (306), 306 states have call successors, (306) [2022-12-14 04:59:19,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1430 states to 1430 states and 1884 transitions. [2022-12-14 04:59:19,853 INFO L78 Accepts]: Start accepts. Automaton has 1430 states and 1884 transitions. Word has length 66 [2022-12-14 04:59:19,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:59:19,854 INFO L495 AbstractCegarLoop]: Abstraction has 1430 states and 1884 transitions. [2022-12-14 04:59:19,854 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-12-14 04:59:19,854 INFO L276 IsEmpty]: Start isEmpty. Operand 1430 states and 1884 transitions. [2022-12-14 04:59:19,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-12-14 04:59:19,854 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:59:19,854 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 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] [2022-12-14 04:59:19,859 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 04:59:20,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:59:20,056 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:59:20,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:59:20,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1524056252, now seen corresponding path program 1 times [2022-12-14 04:59:20,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:59:20,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492811773] [2022-12-14 04:59:20,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:59:20,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:59:20,076 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:59:20,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [909602010] [2022-12-14 04:59:20,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:59:20,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:59:20,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:59:20,078 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:59:20,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 04:59:20,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:59:20,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2022-12-14 04:59:20,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:59:20,195 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 04:59:20,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:59:20,307 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 04:59:20,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:59:20,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492811773] [2022-12-14 04:59:20,308 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:59:20,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [909602010] [2022-12-14 04:59:20,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [909602010] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:59:20,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [53177360] [2022-12-14 04:59:20,309 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-12-14 04:59:20,310 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:59:20,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:59:20,310 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:59:20,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 04:59:23,967 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-12-14 04:59:23,967 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2022-12-14 04:59:25,313 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 04:59:25,318 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 04:59:25,335 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 04:59:32,559 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36805#(and (<= ~counter~0 52) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 04:59:32,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 04:59:32,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 04:59:32,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-12-14 04:59:32,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911749649] [2022-12-14 04:59:32,559 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 04:59:32,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 04:59:32,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 04:59:32,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 04:59:32,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1673, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 04:59:32,560 INFO L87 Difference]: Start difference. First operand 1430 states and 1884 transitions. Second operand has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 04:59:34,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 04:59:34,286 INFO L93 Difference]: Finished difference Result 3913 states and 5424 transitions. [2022-12-14 04:59:34,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 04:59:34,287 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 68 [2022-12-14 04:59:34,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 04:59:34,294 INFO L225 Difference]: With dead ends: 3913 [2022-12-14 04:59:34,295 INFO L226 Difference]: Without dead ends: 3390 [2022-12-14 04:59:34,296 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 157 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=674, Invalid=2986, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 04:59:34,296 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 490 mSDsluCounter, 479 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 490 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 04:59:34,297 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [490 Valid, 571 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 04:59:34,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3390 states. [2022-12-14 04:59:35,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3390 to 3265. [2022-12-14 04:59:35,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3265 states, 2334 states have (on average 1.2609254498714653) internal successors, (2943), 2349 states have internal predecessors, (2943), 736 states have call successors, (736), 195 states have call predecessors, (736), 194 states have return successors, (726), 720 states have call predecessors, (726), 726 states have call successors, (726) [2022-12-14 04:59:35,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3265 states to 3265 states and 4405 transitions. [2022-12-14 04:59:35,606 INFO L78 Accepts]: Start accepts. Automaton has 3265 states and 4405 transitions. Word has length 68 [2022-12-14 04:59:35,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 04:59:35,606 INFO L495 AbstractCegarLoop]: Abstraction has 3265 states and 4405 transitions. [2022-12-14 04:59:35,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-12-14 04:59:35,607 INFO L276 IsEmpty]: Start isEmpty. Operand 3265 states and 4405 transitions. [2022-12-14 04:59:35,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-12-14 04:59:35,607 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 04:59:35,607 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 04:59:35,612 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 04:59:35,808 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:59:35,808 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 04:59:35,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 04:59:35,809 INFO L85 PathProgramCache]: Analyzing trace with hash 689077281, now seen corresponding path program 1 times [2022-12-14 04:59:35,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 04:59:35,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249337024] [2022-12-14 04:59:35,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:59:35,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 04:59:35,831 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 04:59:35,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [276626968] [2022-12-14 04:59:35,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 04:59:35,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 04:59:35,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 04:59:35,835 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 04:59:35,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 04:59:35,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 04:59:35,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 77 conjunts are in the unsatisfiable core [2022-12-14 04:59:35,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 04:59:36,525 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 34 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-12-14 04:59:36,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 04:59:39,657 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 33 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-12-14 04:59:39,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 04:59:39,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249337024] [2022-12-14 04:59:39,657 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 04:59:39,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276626968] [2022-12-14 04:59:39,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276626968] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 04:59:39,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [418597939] [2022-12-14 04:59:39,659 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-12-14 04:59:39,659 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 04:59:39,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 04:59:39,659 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 04:59:39,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:00:21,271 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 05:00:21,274 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 05:00:21,290 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:00:36,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47699#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:00:36,760 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:00:36,760 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:00:36,760 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2022-12-14 05:00:36,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268512720] [2022-12-14 05:00:36,760 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:00:36,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 05:00:36,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:00:36,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 05:00:36,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=2713, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 05:00:36,763 INFO L87 Difference]: Start difference. First operand 3265 states and 4405 transitions. Second operand has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-12-14 05:01:13,670 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:02:10,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:02:10,592 INFO L93 Difference]: Finished difference Result 5368 states and 7465 transitions. [2022-12-14 05:02:10,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-12-14 05:02:10,593 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 79 [2022-12-14 05:02:10,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:02:10,608 INFO L225 Difference]: With dead ends: 5368 [2022-12-14 05:02:10,609 INFO L226 Difference]: Without dead ends: 5317 [2022-12-14 05:02:10,613 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 180 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7113 ImplicationChecksByTransitivity, 77.6s TimeCoverageRelationStatistics Valid=2802, Invalid=16658, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 05:02:10,613 INFO L413 NwaCegarLoop]: 97 mSDtfsCounter, 643 mSDsluCounter, 996 mSDsCounter, 0 mSdLazyCounter, 2581 mSolverCounterSat, 744 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 643 SdHoareTripleChecker+Valid, 1093 SdHoareTripleChecker+Invalid, 3325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 744 IncrementalHoareTripleChecker+Valid, 2581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.1s IncrementalHoareTripleChecker+Time [2022-12-14 05:02:10,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [643 Valid, 1093 Invalid, 3325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [744 Valid, 2581 Invalid, 0 Unknown, 0 Unchecked, 30.1s Time] [2022-12-14 05:02:10,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5317 states. [2022-12-14 05:02:13,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5317 to 4128. [2022-12-14 05:02:13,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4128 states, 3001 states have (on average 1.279573475508164) internal successors, (3840), 3014 states have internal predecessors, (3840), 902 states have call successors, (902), 225 states have call predecessors, (902), 224 states have return successors, (892), 888 states have call predecessors, (892), 892 states have call successors, (892) [2022-12-14 05:02:13,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4128 states to 4128 states and 5634 transitions. [2022-12-14 05:02:13,394 INFO L78 Accepts]: Start accepts. Automaton has 4128 states and 5634 transitions. Word has length 79 [2022-12-14 05:02:13,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:02:13,394 INFO L495 AbstractCegarLoop]: Abstraction has 4128 states and 5634 transitions. [2022-12-14 05:02:13,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-12-14 05:02:13,395 INFO L276 IsEmpty]: Start isEmpty. Operand 4128 states and 5634 transitions. [2022-12-14 05:02:13,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-12-14 05:02:13,395 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:02:13,396 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:02:13,400 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 05:02:13,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:02:13,597 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:02:13,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:02:13,598 INFO L85 PathProgramCache]: Analyzing trace with hash 1576694894, now seen corresponding path program 2 times [2022-12-14 05:02:13,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:02:13,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462700866] [2022-12-14 05:02:13,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:02:13,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:02:13,625 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:02:13,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [400064977] [2022-12-14 05:02:13,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:02:13,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:02:13,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:02:13,630 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:02:13,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 05:02:13,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 05:02:13,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:02:13,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 05:02:13,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:02:13,791 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 120 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-12-14 05:02:13,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:02:13,981 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 56 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-12-14 05:02:13,982 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:02:13,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462700866] [2022-12-14 05:02:13,982 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:02:13,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400064977] [2022-12-14 05:02:13,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400064977] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:02:13,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2063993266] [2022-12-14 05:02:13,983 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-12-14 05:02:13,983 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:02:13,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:02:13,984 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:02:13,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:02:17,744 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-12-14 05:02:21,180 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 05:02:21,183 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 05:02:21,199 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:02:41,501 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62191#(and (<= ~counter~0 52) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 05:02:41,501 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:02:41,501 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:02:41,501 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-12-14 05:02:41,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929927213] [2022-12-14 05:02:41,501 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:02:41,501 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 05:02:41,501 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:02:41,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 05:02:41,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=1856, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 05:02:41,503 INFO L87 Difference]: Start difference. First operand 4128 states and 5634 transitions. Second operand has 26 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 26 states have internal predecessors, (92), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-12-14 05:02:47,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:02:47,146 INFO L93 Difference]: Finished difference Result 6552 states and 9156 transitions. [2022-12-14 05:02:47,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-12-14 05:02:47,146 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 26 states have internal predecessors, (92), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) Word has length 89 [2022-12-14 05:02:47,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:02:47,163 INFO L225 Difference]: With dead ends: 6552 [2022-12-14 05:02:47,163 INFO L226 Difference]: Without dead ends: 6510 [2022-12-14 05:02:47,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 214 SyntacticMatches, 4 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=926, Invalid=3630, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 05:02:47,165 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 526 mSDsluCounter, 603 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 526 SdHoareTripleChecker+Valid, 717 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 05:02:47,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [526 Valid, 717 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 450 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 05:02:47,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6510 states. [2022-12-14 05:02:51,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6510 to 6280. [2022-12-14 05:02:51,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6280 states, 4631 states have (on average 1.2709997840639171) internal successors, (5886), 4683 states have internal predecessors, (5886), 1355 states have call successors, (1355), 294 states have call predecessors, (1355), 293 states have return successors, (1341), 1302 states have call predecessors, (1341), 1341 states have call successors, (1341) [2022-12-14 05:02:51,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6280 states to 6280 states and 8582 transitions. [2022-12-14 05:02:51,589 INFO L78 Accepts]: Start accepts. Automaton has 6280 states and 8582 transitions. Word has length 89 [2022-12-14 05:02:51,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:02:51,589 INFO L495 AbstractCegarLoop]: Abstraction has 6280 states and 8582 transitions. [2022-12-14 05:02:51,590 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 26 states have internal predecessors, (92), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-12-14 05:02:51,590 INFO L276 IsEmpty]: Start isEmpty. Operand 6280 states and 8582 transitions. [2022-12-14 05:02:51,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-12-14 05:02:51,591 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:02:51,591 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:02:51,595 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 05:02:51,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 05:02:51,793 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:02:51,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:02:51,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1613266328, now seen corresponding path program 2 times [2022-12-14 05:02:51,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:02:51,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562514746] [2022-12-14 05:02:51,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:02:51,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:02:51,820 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:02:51,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [854719644] [2022-12-14 05:02:51,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:02:51,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:02:51,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:02:51,824 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:02:51,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 05:02:51,871 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 05:02:51,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:02:51,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 05:02:51,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:02:51,912 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-12-14 05:02:51,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:02:51,959 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-12-14 05:02:51,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:02:51,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562514746] [2022-12-14 05:02:51,959 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:02:51,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854719644] [2022-12-14 05:02:51,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [854719644] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:02:51,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1889610161] [2022-12-14 05:02:51,960 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-12-14 05:02:51,960 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:02:51,960 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:02:51,961 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:02:51,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:02:55,653 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-12-14 05:02:58,593 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 05:02:58,596 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 05:02:58,610 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:03:16,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '81226#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:03:16,121 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:03:16,121 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:03:16,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-12-14 05:03:16,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656010593] [2022-12-14 05:03:16,121 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:03:16,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 05:03:16,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:03:16,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 05:03:16,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2022-12-14 05:03:16,122 INFO L87 Difference]: Start difference. First operand 6280 states and 8582 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 05:03:23,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:03:23,249 INFO L93 Difference]: Finished difference Result 8879 states and 12598 transitions. [2022-12-14 05:03:23,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 05:03:23,250 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 90 [2022-12-14 05:03:23,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:03:23,278 INFO L225 Difference]: With dead ends: 8879 [2022-12-14 05:03:23,278 INFO L226 Difference]: Without dead ends: 8817 [2022-12-14 05:03:23,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 237 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=223, Invalid=1669, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 05:03:23,281 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 120 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 05:03:23,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 366 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 05:03:23,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8817 states. [2022-12-14 05:03:27,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8817 to 6261. [2022-12-14 05:03:27,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6261 states, 4543 states have (on average 1.2775698877393793) internal successors, (5804), 4604 states have internal predecessors, (5804), 1424 states have call successors, (1424), 294 states have call predecessors, (1424), 293 states have return successors, (1410), 1362 states have call predecessors, (1410), 1410 states have call successors, (1410) [2022-12-14 05:03:27,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6261 states to 6261 states and 8638 transitions. [2022-12-14 05:03:27,762 INFO L78 Accepts]: Start accepts. Automaton has 6261 states and 8638 transitions. Word has length 90 [2022-12-14 05:03:27,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:03:27,763 INFO L495 AbstractCegarLoop]: Abstraction has 6261 states and 8638 transitions. [2022-12-14 05:03:27,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 05:03:27,763 INFO L276 IsEmpty]: Start isEmpty. Operand 6261 states and 8638 transitions. [2022-12-14 05:03:27,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-12-14 05:03:27,764 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:03:27,764 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:03:27,769 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 05:03:27,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-12-14 05:03:27,966 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:03:27,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:03:27,967 INFO L85 PathProgramCache]: Analyzing trace with hash -307282759, now seen corresponding path program 2 times [2022-12-14 05:03:27,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:03:27,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835910027] [2022-12-14 05:03:27,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:03:27,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:03:27,994 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:03:27,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [492446578] [2022-12-14 05:03:27,995 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:03:27,996 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:03:27,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:03:27,999 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:03:28,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 05:03:28,087 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 05:03:28,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:03:28,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 05:03:28,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:03:28,991 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 35 refuted. 0 times theorem prover too weak. 265 trivial. 0 not checked. [2022-12-14 05:03:28,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:03:30,171 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 34 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-12-14 05:03:30,172 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:03:30,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835910027] [2022-12-14 05:03:30,172 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:03:30,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492446578] [2022-12-14 05:03:30,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [492446578] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:03:30,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [581930559] [2022-12-14 05:03:30,173 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-12-14 05:03:30,173 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:03:30,174 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:03:30,174 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:03:30,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:03:49,931 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 33 for LOIs [2022-12-14 05:03:49,958 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 05:03:49,973 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:03:54,213 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '103864#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|))' at error location [2022-12-14 05:03:54,214 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:03:54,214 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:03:54,214 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2022-12-14 05:03:54,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930776185] [2022-12-14 05:03:54,214 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:03:54,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 05:03:54,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:03:54,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 05:03:54,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=2198, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 05:03:54,216 INFO L87 Difference]: Start difference. First operand 6261 states and 8638 transitions. Second operand has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-12-14 05:04:01,914 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.99s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:04:22,385 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:04:26,160 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:04:37,927 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:05:50,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:05:50,658 INFO L93 Difference]: Finished difference Result 11085 states and 15410 transitions. [2022-12-14 05:05:50,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-12-14 05:05:50,659 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) Word has length 99 [2022-12-14 05:05:50,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:05:50,673 INFO L225 Difference]: With dead ends: 11085 [2022-12-14 05:05:50,674 INFO L226 Difference]: Without dead ends: 7689 [2022-12-14 05:05:50,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 222 SyntacticMatches, 25 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6749 ImplicationChecksByTransitivity, 87.5s TimeCoverageRelationStatistics Valid=2482, Invalid=14548, Unknown=0, NotChecked=0, Total=17030 [2022-12-14 05:05:50,680 INFO L413 NwaCegarLoop]: 127 mSDtfsCounter, 503 mSDsluCounter, 890 mSDsCounter, 0 mSdLazyCounter, 1718 mSolverCounterSat, 703 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 503 SdHoareTripleChecker+Valid, 1017 SdHoareTripleChecker+Invalid, 2423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 703 IncrementalHoareTripleChecker+Valid, 1718 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:05:50,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [503 Valid, 1017 Invalid, 2423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [703 Valid, 1718 Invalid, 2 Unknown, 0 Unchecked, 27.0s Time] [2022-12-14 05:05:50,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7689 states. [2022-12-14 05:05:56,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7689 to 6627. [2022-12-14 05:05:56,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6627 states, 4759 states have (on average 1.2771590670308888) internal successors, (6078), 4823 states have internal predecessors, (6078), 1547 states have call successors, (1547), 320 states have call predecessors, (1547), 320 states have return successors, (1534), 1483 states have call predecessors, (1534), 1534 states have call successors, (1534) [2022-12-14 05:05:56,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6627 states to 6627 states and 9159 transitions. [2022-12-14 05:05:56,127 INFO L78 Accepts]: Start accepts. Automaton has 6627 states and 9159 transitions. Word has length 99 [2022-12-14 05:05:56,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:05:56,127 INFO L495 AbstractCegarLoop]: Abstraction has 6627 states and 9159 transitions. [2022-12-14 05:05:56,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-12-14 05:05:56,128 INFO L276 IsEmpty]: Start isEmpty. Operand 6627 states and 9159 transitions. [2022-12-14 05:05:56,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-12-14 05:05:56,130 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:05:56,130 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:05:56,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-12-14 05:05:56,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:05:56,331 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:05:56,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:05:56,332 INFO L85 PathProgramCache]: Analyzing trace with hash -90675194, now seen corresponding path program 1 times [2022-12-14 05:05:56,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:05:56,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953155953] [2022-12-14 05:05:56,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:05:56,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:05:56,362 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:05:56,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1572556569] [2022-12-14 05:05:56,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:05:56,363 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:05:56,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:05:56,365 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:05:56,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 05:05:56,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:05:56,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 35 conjunts are in the unsatisfiable core [2022-12-14 05:05:56,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:05:56,582 INFO L134 CoverageAnalysis]: Checked inductivity of 452 backedges. 47 proven. 34 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2022-12-14 05:05:56,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:05:57,097 INFO L134 CoverageAnalysis]: Checked inductivity of 452 backedges. 63 proven. 17 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2022-12-14 05:05:57,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:05:57,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953155953] [2022-12-14 05:05:57,097 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:05:57,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1572556569] [2022-12-14 05:05:57,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1572556569] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:05:57,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1400309910] [2022-12-14 05:05:57,098 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-12-14 05:05:57,099 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:05:57,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:05:57,099 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:05:57,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:06:26,274 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 05:06:26,277 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 05:06:26,296 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:06:30,499 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '130341#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 05:06:30,500 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:06:30,500 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:06:30,500 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2022-12-14 05:06:30,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900064619] [2022-12-14 05:06:30,500 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:06:30,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-12-14 05:06:30,501 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:06:30,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-12-14 05:06:30,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1622, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 05:06:30,501 INFO L87 Difference]: Start difference. First operand 6627 states and 9159 transitions. Second operand has 21 states, 20 states have (on average 3.1) internal successors, (62), 18 states have internal predecessors, (62), 9 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 9 states have call predecessors, (32), 9 states have call successors, (32) [2022-12-14 05:06:42,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:06:42,908 INFO L93 Difference]: Finished difference Result 14373 states and 20736 transitions. [2022-12-14 05:06:42,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 05:06:42,909 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.1) internal successors, (62), 18 states have internal predecessors, (62), 9 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 9 states have call predecessors, (32), 9 states have call successors, (32) Word has length 114 [2022-12-14 05:06:42,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:06:42,938 INFO L225 Difference]: With dead ends: 14373 [2022-12-14 05:06:42,938 INFO L226 Difference]: Without dead ends: 10313 [2022-12-14 05:06:42,948 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 311 SyntacticMatches, 7 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1390 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=518, Invalid=3904, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 05:06:42,949 INFO L413 NwaCegarLoop]: 87 mSDtfsCounter, 273 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 808 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 674 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 808 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 05:06:42,949 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [277 Valid, 674 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 808 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 05:06:42,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10313 states. [2022-12-14 05:06:52,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10313 to 9463. [2022-12-14 05:06:52,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9463 states, 6214 states have (on average 1.3125201158673963) internal successors, (8156), 6329 states have internal predecessors, (8156), 2890 states have call successors, (2890), 359 states have call predecessors, (2890), 358 states have return successors, (2878), 2774 states have call predecessors, (2878), 2878 states have call successors, (2878) [2022-12-14 05:06:52,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9463 states to 9463 states and 13924 transitions. [2022-12-14 05:06:52,369 INFO L78 Accepts]: Start accepts. Automaton has 9463 states and 13924 transitions. Word has length 114 [2022-12-14 05:06:52,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:06:52,369 INFO L495 AbstractCegarLoop]: Abstraction has 9463 states and 13924 transitions. [2022-12-14 05:06:52,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.1) internal successors, (62), 18 states have internal predecessors, (62), 9 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 9 states have call predecessors, (32), 9 states have call successors, (32) [2022-12-14 05:06:52,369 INFO L276 IsEmpty]: Start isEmpty. Operand 9463 states and 13924 transitions. [2022-12-14 05:06:52,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-12-14 05:06:52,371 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:06:52,371 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:06:52,376 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-12-14 05:06:52,571 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 05:06:52,572 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:06:52,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:06:52,572 INFO L85 PathProgramCache]: Analyzing trace with hash 147966679, now seen corresponding path program 2 times [2022-12-14 05:06:52,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:06:52,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081094449] [2022-12-14 05:06:52,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:06:52,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:06:52,579 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:06:52,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1502024249] [2022-12-14 05:06:52,579 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:06:52,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:06:52,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:06:52,580 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:06:52,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca152b34-97ff-420e-9c8b-da418db1f45d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 05:06:52,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 05:06:52,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:06:52,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 89 conjunts are in the unsatisfiable core [2022-12-14 05:06:52,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:06:54,022 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 62 proven. 75 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2022-12-14 05:06:54,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:07:00,097 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 62 proven. 74 refuted. 0 times theorem prover too weak. 278 trivial. 0 not checked. [2022-12-14 05:07:00,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:07:00,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081094449] [2022-12-14 05:07:00,097 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:07:00,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1502024249] [2022-12-14 05:07:00,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1502024249] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:07:00,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [355426219] [2022-12-14 05:07:00,098 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-12-14 05:07:00,098 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:07:00,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:07:00,099 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:07:00,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:07:32,359 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 05:07:32,363 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-12-14 05:07:32,380 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:07:51,510 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '166600#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-12-14 05:07:51,510 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:07:51,510 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:07:51,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 36 [2022-12-14 05:07:51,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518789897] [2022-12-14 05:07:51,510 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:07:51,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-12-14 05:07:51,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:07:51,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-12-14 05:07:51,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=2953, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 05:07:51,511 INFO L87 Difference]: Start difference. First operand 9463 states and 13924 transitions. Second operand has 36 states, 33 states have (on average 2.909090909090909) internal successors, (96), 32 states have internal predecessors, (96), 11 states have call successors, (30), 3 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 9 states have call successors, (29) [2022-12-14 05:07:55,717 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:08:03,715 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:08:09,297 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 []