./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-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_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/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_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/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_424b03dd-a7f4-47f0-9a3a-e6e76be16903/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 ca2134f8a32f49a0943527ee47fd89b4eb01286294fd09a8197c7c707de74c1d --- 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 14:49:48,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 14:49:48,460 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 14:49:48,478 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 14:49:48,478 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 14:49:48,479 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 14:49:48,481 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 14:49:48,482 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 14:49:48,484 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 14:49:48,485 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 14:49:48,485 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 14:49:48,487 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 14:49:48,487 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 14:49:48,488 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 14:49:48,489 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 14:49:48,490 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 14:49:48,491 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 14:49:48,492 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 14:49:48,493 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 14:49:48,495 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 14:49:48,496 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 14:49:48,498 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 14:49:48,499 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 14:49:48,500 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 14:49:48,503 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 14:49:48,503 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 14:49:48,504 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 14:49:48,505 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 14:49:48,505 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 14:49:48,506 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 14:49:48,506 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 14:49:48,507 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 14:49:48,508 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 14:49:48,508 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 14:49:48,509 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 14:49:48,510 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 14:49:48,510 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 14:49:48,510 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 14:49:48,510 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 14:49:48,511 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 14:49:48,511 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 14:49:48,512 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 14:49:48,532 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 14:49:48,532 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 14:49:48,532 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 14:49:48,532 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 14:49:48,533 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 14:49:48,533 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 14:49:48,533 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 14:49:48,533 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 14:49:48,534 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 14:49:48,534 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 14:49:48,534 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 14:49:48,534 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 14:49:48,534 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 14:49:48,534 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 14:49:48,535 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 14:49:48,535 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 14:49:48,535 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 14:49:48,535 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 14:49:48,536 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 14:49:48,536 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 14:49:48,536 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 14:49:48,536 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 14:49:48,536 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 14:49:48,536 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 14:49:48,536 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 14:49:48,536 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 14:49:48,536 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 14:49:48,537 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 14:49:48,537 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 14:49:48,537 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 14:49:48,537 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 14:49:48,537 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 14:49:48,538 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:49:48,538 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 14:49:48,538 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 14:49:48,538 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 14:49:48,538 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 14:49:48,538 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 14:49:48,539 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 14:49:48,539 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 14:49:48,539 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 14:49:48,539 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_424b03dd-a7f4-47f0-9a3a-e6e76be16903/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca2134f8a32f49a0943527ee47fd89b4eb01286294fd09a8197c7c707de74c1d [2022-12-14 14:49:48,738 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 14:49:48,756 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 14:49:48,758 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 14:49:48,759 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 14:49:48,759 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 14:49:48,760 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c [2022-12-14 14:49:51,353 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 14:49:51,484 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 14:49:51,485 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c [2022-12-14 14:49:51,491 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/data/0b588fddd/48272526baeb4d7887c0cebea7bcc879/FLAGe04382f1e [2022-12-14 14:49:51,502 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/data/0b588fddd/48272526baeb4d7887c0cebea7bcc879 [2022-12-14 14:49:51,505 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 14:49:51,506 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 14:49:51,507 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 14:49:51,507 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 14:49:51,511 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 14:49:51,511 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,512 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3091b41b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51, skipping insertion in model container [2022-12-14 14:49:51,512 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,519 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 14:49:51,531 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 14:49:51,649 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_424b03dd-a7f4-47f0-9a3a-e6e76be16903/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c[535,548] [2022-12-14 14:49:51,667 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:49:51,676 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 14:49:51,685 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_424b03dd-a7f4-47f0-9a3a-e6e76be16903/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c[535,548] [2022-12-14 14:49:51,694 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 14:49:51,707 INFO L208 MainTranslator]: Completed translation [2022-12-14 14:49:51,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51 WrapperNode [2022-12-14 14:49:51,708 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 14:49:51,708 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 14:49:51,709 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 14:49:51,709 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 14:49:51,714 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,719 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,738 INFO L138 Inliner]: procedures = 14, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2022-12-14 14:49:51,738 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 14:49:51,739 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 14:49:51,739 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 14:49:51,739 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 14:49:51,747 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,747 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,749 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,749 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,752 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,756 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,757 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,758 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,760 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 14:49:51,760 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 14:49:51,761 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 14:49:51,761 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 14:49:51,762 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (1/1) ... [2022-12-14 14:49:51,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 14:49:51,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:49:51,786 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 14:49:51,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 14:49:51,815 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 14:49:51,815 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-12-14 14:49:51,815 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-12-14 14:49:51,815 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 14:49:51,815 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 14:49:51,815 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 14:49:51,815 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 14:49:51,816 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 14:49:51,868 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 14:49:51,870 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 14:49:51,982 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 14:49:51,998 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 14:49:51,998 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-14 14:49:52,000 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:49:52 BoogieIcfgContainer [2022-12-14 14:49:52,000 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 14:49:52,002 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 14:49:52,002 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 14:49:52,004 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 14:49:52,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 02:49:51" (1/3) ... [2022-12-14 14:49:52,005 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52ca95d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:49:52, skipping insertion in model container [2022-12-14 14:49:52,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:51" (2/3) ... [2022-12-14 14:49:52,006 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52ca95d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:49:52, skipping insertion in model container [2022-12-14 14:49:52,006 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:49:52" (3/3) ... [2022-12-14 14:49:52,007 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound50.c [2022-12-14 14:49:52,022 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 14:49:52,022 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 14:49:52,058 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 14:49:52,063 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;@7d46add8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 14:49:52,063 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 14:49:52,067 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 14:49:52,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 14:49:52,073 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:52,073 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:52,073 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:49:52,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:52,078 INFO L85 PathProgramCache]: Analyzing trace with hash -732132214, now seen corresponding path program 1 times [2022-12-14 14:49:52,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:52,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241117780] [2022-12-14 14:49:52,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:52,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:52,169 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:49:52,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1314118627] [2022-12-14 14:49:52,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:52,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:49:52,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:49:52,172 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:49:52,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 14:49:52,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:52,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 1 conjunts are in the unsatisfiable core [2022-12-14 14:49:52,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:49:52,256 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 14:49:52,256 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 14:49:52,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:52,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241117780] [2022-12-14 14:49:52,257 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:49:52,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314118627] [2022-12-14 14:49:52,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314118627] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:52,258 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:52,258 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 14:49:52,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583375903] [2022-12-14 14:49:52,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:52,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 14:49:52,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:52,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 14:49:52,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 14:49:52,287 INFO L87 Difference]: Start difference. First operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) 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 14:49:52,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:52,309 INFO L93 Difference]: Finished difference Result 48 states and 77 transitions. [2022-12-14 14:49:52,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 14:49:52,311 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 14:49:52,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:52,316 INFO L225 Difference]: With dead ends: 48 [2022-12-14 14:49:52,316 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 14:49:52,319 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 14:49:52,321 INFO L413 NwaCegarLoop]: 33 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, 33 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 14:49:52,322 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:49:52,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 14:49:52,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-12-14 14:49:52,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-12-14 14:49:52,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2022-12-14 14:49:52,347 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 13 [2022-12-14 14:49:52,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:52,348 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2022-12-14 14:49:52,348 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 14:49:52,348 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2022-12-14 14:49:52,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 14:49:52,349 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:52,349 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:52,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 14:49:52,550 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:49:52,550 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:49:52,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:52,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1566218095, now seen corresponding path program 1 times [2022-12-14 14:49:52,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:52,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456316837] [2022-12-14 14:49:52,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:52,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:52,560 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:49:52,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1514122907] [2022-12-14 14:49:52,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:52,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:49:52,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:49:52,561 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:49:52,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 14:49:52,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:52,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 14:49:52,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:49:52,655 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 14:49:52,655 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 14:49:52,655 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:52,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456316837] [2022-12-14 14:49:52,655 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:49:52,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514122907] [2022-12-14 14:49:52,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1514122907] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:52,656 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:52,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:49:52,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827342621] [2022-12-14 14:49:52,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:52,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 14:49:52,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:52,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 14:49:52,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 14:49:52,658 INFO L87 Difference]: Start difference. First operand 25 states and 34 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 14:49:52,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:52,679 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-12-14 14:49:52,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 14:49:52,680 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 14:49:52,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:52,680 INFO L225 Difference]: With dead ends: 34 [2022-12-14 14:49:52,681 INFO L226 Difference]: Without dead ends: 27 [2022-12-14 14:49:52,681 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 14:49:52,682 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 82 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 14:49:52,683 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 82 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:49:52,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-12-14 14:49:52,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-12-14 14:49:52,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-12-14 14:49:52,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2022-12-14 14:49:52,689 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 14 [2022-12-14 14:49:52,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:52,689 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2022-12-14 14:49:52,690 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 14:49:52,690 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2022-12-14 14:49:52,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 14:49:52,690 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:52,690 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:49:52,694 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 14:49:52,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:49:52,891 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:49:52,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:52,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1567886391, now seen corresponding path program 1 times [2022-12-14 14:49:52,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:52,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943213710] [2022-12-14 14:49:52,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:52,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:52,903 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:49:52,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [829266968] [2022-12-14 14:49:52,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:52,903 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:49:52,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:49:52,904 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:49:52,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 14:49:52,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:52,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 14:49:52,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:49:53,045 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 14:49:53,045 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 14:49:53,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:53,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943213710] [2022-12-14 14:49:53,045 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:49:53,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829266968] [2022-12-14 14:49:53,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829266968] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:49:53,046 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:49:53,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 14:49:53,046 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79497963] [2022-12-14 14:49:53,046 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:49:53,046 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 14:49:53,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:49:53,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 14:49:53,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 14:49:53,047 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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 14:49:56,923 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 14:49:58,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:49:58,493 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2022-12-14 14:49:58,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 14:49:58,494 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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 14:49:58,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:49:58,495 INFO L225 Difference]: With dead ends: 46 [2022-12-14 14:49:58,495 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 14:49:58,496 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 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 14:49:58,497 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 16 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2022-12-14 14:49:58,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 81 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 1 Unknown, 0 Unchecked, 5.4s Time] [2022-12-14 14:49:58,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 14:49:58,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-12-14 14:49:58,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 31 states have internal predecessors, (43), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-12-14 14:49:58,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 60 transitions. [2022-12-14 14:49:58,506 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 60 transitions. Word has length 14 [2022-12-14 14:49:58,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:49:58,506 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 60 transitions. [2022-12-14 14:49:58,506 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 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 14:49:58,506 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 60 transitions. [2022-12-14 14:49:58,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 14:49:58,507 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:49:58,507 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 14:49:58,511 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 14:49:58,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:49:58,708 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:49:58,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:49:58,710 INFO L85 PathProgramCache]: Analyzing trace with hash 1259885980, now seen corresponding path program 1 times [2022-12-14 14:49:58,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:49:58,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661922755] [2022-12-14 14:49:58,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:58,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:49:58,725 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:49:58,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [655014742] [2022-12-14 14:49:58,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:49:58,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:49:58,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:49:58,727 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:49:58,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 14:49:58,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:49:58,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 14:49:58,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:49:58,858 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:49:58,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:49:58,988 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:49:58,989 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:49:58,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661922755] [2022-12-14 14:49:58,989 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:49:58,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655014742] [2022-12-14 14:49:58,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655014742] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:49:58,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715019374] [2022-12-14 14:49:59,008 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 14:49:59,009 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:49:59,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:49:59,017 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:49:59,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:49:59,367 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-12-14 14:49:59,378 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:49:59,410 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:50:03,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1715019374] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:50:03,736 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:50:03,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 7] total 22 [2022-12-14 14:50:03,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667717909] [2022-12-14 14:50:03,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:50:03,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 14:50:03,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:50:03,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 14:50:03,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2022-12-14 14:50:03,742 INFO L87 Difference]: Start difference. First operand 43 states and 60 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 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 14:50:03,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:50:03,934 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2022-12-14 14:50:03,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 14:50:03,935 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 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 20 [2022-12-14 14:50:03,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:50:03,936 INFO L225 Difference]: With dead ends: 57 [2022-12-14 14:50:03,936 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 14:50:03,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2022-12-14 14:50:03,937 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 1 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 14:50:03,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 107 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 14:50:03,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 14:50:03,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-12-14 14:50:03,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 35 states have internal predecessors, (47), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 14:50:03,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2022-12-14 14:50:03,950 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 20 [2022-12-14 14:50:03,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:50:03,951 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2022-12-14 14:50:03,951 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 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 14:50:03,951 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2022-12-14 14:50:03,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 14:50:03,952 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:50:03,952 INFO L195 NwaCegarLoop]: trace histogram [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 14:50:03,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 14:50:04,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:04,153 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:50:04,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:50:04,153 INFO L85 PathProgramCache]: Analyzing trace with hash 1960315687, now seen corresponding path program 1 times [2022-12-14 14:50:04,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:50:04,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647010935] [2022-12-14 14:50:04,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:04,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:50:04,161 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:50:04,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1062068236] [2022-12-14 14:50:04,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:04,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:04,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:50:04,163 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:50:04,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 14:50:04,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:50:04,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 14:50:04,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:50:04,223 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:50:04,223 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 14:50:04,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:50:04,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647010935] [2022-12-14 14:50:04,224 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:50:04,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062068236] [2022-12-14 14:50:04,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062068236] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:50:04,224 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:50:04,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 14:50:04,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680832674] [2022-12-14 14:50:04,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:50:04,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 14:50:04,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:50:04,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 14:50:04,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 14:50:04,226 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 14:50:04,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:50:04,256 INFO L93 Difference]: Finished difference Result 86 states and 120 transitions. [2022-12-14 14:50:04,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 14:50:04,257 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), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2022-12-14 14:50:04,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:50:04,257 INFO L225 Difference]: With dead ends: 86 [2022-12-14 14:50:04,257 INFO L226 Difference]: Without dead ends: 51 [2022-12-14 14:50:04,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 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 14:50:04,258 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:50:04,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 87 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:50:04,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-12-14 14:50:04,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-12-14 14:50:04,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 37 states have internal predecessors, (49), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-12-14 14:50:04,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 68 transitions. [2022-12-14 14:50:04,272 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 68 transitions. Word has length 26 [2022-12-14 14:50:04,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:50:04,272 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 68 transitions. [2022-12-14 14:50:04,272 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), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-12-14 14:50:04,272 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 68 transitions. [2022-12-14 14:50:04,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 14:50:04,273 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:50:04,273 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:50:04,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-12-14 14:50:04,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:04,475 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:50:04,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:50:04,476 INFO L85 PathProgramCache]: Analyzing trace with hash 1819629797, now seen corresponding path program 1 times [2022-12-14 14:50:04,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:50:04,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954049429] [2022-12-14 14:50:04,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:04,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:50:04,506 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:50:04,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1675713703] [2022-12-14 14:50:04,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:04,508 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:04,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:50:04,510 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:50:04,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 14:50:04,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:50:04,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2022-12-14 14:50:04,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:50:04,712 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 14:50:04,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:50:04,807 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 14:50:04,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:50:04,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954049429] [2022-12-14 14:50:04,807 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:50:04,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675713703] [2022-12-14 14:50:04,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675713703] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:50:04,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1031769898] [2022-12-14 14:50:04,810 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-12-14 14:50:04,810 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:50:04,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:50:04,810 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:50:04,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:50:05,789 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 89 for LOIs [2022-12-14 14:50:05,901 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:50:05,926 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:50:16,380 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1226#(and (<= 2 ~counter~0) (<= 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|))' at error location [2022-12-14 14:50:16,380 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:50:16,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:50:16,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 12 [2022-12-14 14:50:16,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570195305] [2022-12-14 14:50:16,380 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:50:16,381 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 14:50:16,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:50:16,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 14:50:16,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=657, Unknown=0, NotChecked=0, Total=756 [2022-12-14 14:50:16,382 INFO L87 Difference]: Start difference. First operand 51 states and 68 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 14:50:16,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:50:16,721 INFO L93 Difference]: Finished difference Result 71 states and 96 transitions. [2022-12-14 14:50:16,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 14:50:16,722 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 30 [2022-12-14 14:50:16,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:50:16,723 INFO L225 Difference]: With dead ends: 71 [2022-12-14 14:50:16,723 INFO L226 Difference]: Without dead ends: 67 [2022-12-14 14:50:16,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=116, Invalid=754, Unknown=0, NotChecked=0, Total=870 [2022-12-14 14:50:16,725 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 81 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:50:16,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 136 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:50:16,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-12-14 14:50:16,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 37. [2022-12-14 14:50:16,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 26 states have internal predecessors, (32), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 14:50:16,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2022-12-14 14:50:16,742 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 30 [2022-12-14 14:50:16,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:50:16,743 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2022-12-14 14:50:16,743 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 14:50:16,743 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2022-12-14 14:50:16,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 14:50:16,744 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:50:16,744 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:50:16,748 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 14:50:16,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 14:50:16,946 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:50:16,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:50:16,947 INFO L85 PathProgramCache]: Analyzing trace with hash 149144288, now seen corresponding path program 1 times [2022-12-14 14:50:16,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:50:16,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905533873] [2022-12-14 14:50:16,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:16,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:50:16,960 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:50:16,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1118469366] [2022-12-14 14:50:16,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:16,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:16,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:50:16,962 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:50:16,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 14:50:17,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:50:17,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 14:50:17,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:50:17,042 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:50:17,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:50:17,086 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 14:50:17,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:50:17,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905533873] [2022-12-14 14:50:17,087 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:50:17,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118469366] [2022-12-14 14:50:17,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118469366] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 14:50:17,087 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 14:50:17,087 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 10 [2022-12-14 14:50:17,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075050742] [2022-12-14 14:50:17,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:50:17,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 14:50:17,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:50:17,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 14:50:17,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-12-14 14:50:17,088 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 14:50:17,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:50:17,131 INFO L93 Difference]: Finished difference Result 67 states and 84 transitions. [2022-12-14 14:50:17,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 14:50:17,131 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2022-12-14 14:50:17,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:50:17,132 INFO L225 Difference]: With dead ends: 67 [2022-12-14 14:50:17,132 INFO L226 Difference]: Without dead ends: 46 [2022-12-14 14:50:17,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-12-14 14:50:17,132 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 12 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:50:17,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 125 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:50:17,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-12-14 14:50:17,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2022-12-14 14:50:17,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-12-14 14:50:17,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-12-14 14:50:17,143 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 32 [2022-12-14 14:50:17,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:50:17,143 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-12-14 14:50:17,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-12-14 14:50:17,143 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-12-14 14:50:17,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 14:50:17,144 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:50:17,144 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:50:17,149 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 14:50:17,344 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:17,345 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:50:17,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:50:17,345 INFO L85 PathProgramCache]: Analyzing trace with hash 724021605, now seen corresponding path program 1 times [2022-12-14 14:50:17,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:50:17,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697549610] [2022-12-14 14:50:17,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:17,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:50:17,353 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:50:17,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1396179970] [2022-12-14 14:50:17,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:17,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:17,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:50:17,355 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:50:17,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 14:50:17,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:50:17,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 14:50:17,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:50:17,450 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:50:17,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:50:17,485 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 14:50:17,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:50:17,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697549610] [2022-12-14 14:50:17,485 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:50:17,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396179970] [2022-12-14 14:50:17,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396179970] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:50:17,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2011010532] [2022-12-14 14:50:17,488 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 14:50:17,488 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:50:17,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:50:17,488 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:50:17,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:50:19,443 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 14:50:19,446 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:50:19,469 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:50:26,219 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1965#(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 14:50:26,219 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:50:26,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:50:26,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-12-14 14:50:26,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980711635] [2022-12-14 14:50:26,220 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:50:26,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 14:50:26,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:50:26,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 14:50:26,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=669, Unknown=0, NotChecked=0, Total=812 [2022-12-14 14:50:26,221 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-12-14 14:50:26,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:50:26,339 INFO L93 Difference]: Finished difference Result 122 states and 157 transitions. [2022-12-14 14:50:26,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 14:50:26,339 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 34 [2022-12-14 14:50:26,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:50:26,340 INFO L225 Difference]: With dead ends: 122 [2022-12-14 14:50:26,340 INFO L226 Difference]: Without dead ends: 101 [2022-12-14 14:50:26,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 14:50:26,341 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 55 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:50:26,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 207 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:50:26,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-12-14 14:50:26,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 88. [2022-12-14 14:50:26,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 64 states have (on average 1.28125) internal successors, (82), 65 states have internal predecessors, (82), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2022-12-14 14:50:26,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 113 transitions. [2022-12-14 14:50:26,360 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 113 transitions. Word has length 34 [2022-12-14 14:50:26,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:50:26,360 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 113 transitions. [2022-12-14 14:50:26,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-12-14 14:50:26,361 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 113 transitions. [2022-12-14 14:50:26,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 14:50:26,361 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:50:26,361 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:50:26,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-12-14 14:50:26,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:26,563 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:50:26,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:50:26,564 INFO L85 PathProgramCache]: Analyzing trace with hash -1908181273, now seen corresponding path program 1 times [2022-12-14 14:50:26,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:50:26,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872844642] [2022-12-14 14:50:26,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:26,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:50:26,585 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:50:26,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [886567099] [2022-12-14 14:50:26,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:26,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:26,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:50:26,589 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:50:26,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 14:50:26,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:50:26,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 14:50:26,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:50:26,663 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 14:50:26,663 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 14:50:26,663 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:50:26,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872844642] [2022-12-14 14:50:26,663 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:50:26,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886567099] [2022-12-14 14:50:26,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886567099] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:50:26,663 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:50:26,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 14:50:26,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481510799] [2022-12-14 14:50:26,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:50:26,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 14:50:26,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:50:26,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 14:50:26,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 14:50:26,665 INFO L87 Difference]: Start difference. First operand 88 states and 113 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-12-14 14:50:26,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:50:26,717 INFO L93 Difference]: Finished difference Result 151 states and 201 transitions. [2022-12-14 14:50:26,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 14:50:26,718 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2022-12-14 14:50:26,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:50:26,720 INFO L225 Difference]: With dead ends: 151 [2022-12-14 14:50:26,720 INFO L226 Difference]: Without dead ends: 112 [2022-12-14 14:50:26,721 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 14:50:26,721 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 20 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:50:26,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 77 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:50:26,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-12-14 14:50:26,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2022-12-14 14:50:26,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 81 states have (on average 1.2839506172839505) internal successors, (104), 82 states have internal predecessors, (104), 21 states have call successors, (21), 8 states have call predecessors, (21), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-12-14 14:50:26,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 145 transitions. [2022-12-14 14:50:26,756 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 145 transitions. Word has length 38 [2022-12-14 14:50:26,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:50:26,756 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 145 transitions. [2022-12-14 14:50:26,756 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-12-14 14:50:26,756 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 145 transitions. [2022-12-14 14:50:26,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 14:50:26,757 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:50:26,757 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:50:26,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 14:50:26,958 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-12-14 14:50:26,959 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:50:26,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:50:26,960 INFO L85 PathProgramCache]: Analyzing trace with hash 1881389676, now seen corresponding path program 1 times [2022-12-14 14:50:26,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:50:26,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334602423] [2022-12-14 14:50:26,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:26,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:50:26,990 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:50:26,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [106048458] [2022-12-14 14:50:26,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:26,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:26,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:50:26,994 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:50:26,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 14:50:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:50:27,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 14:50:27,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:50:27,089 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:50:27,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:50:27,133 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 14:50:27,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:50:27,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334602423] [2022-12-14 14:50:27,133 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:50:27,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106048458] [2022-12-14 14:50:27,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106048458] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:50:27,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1114808470] [2022-12-14 14:50:27,134 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:50:27,135 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:50:27,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:50:27,135 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:50:27,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:50:28,576 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 55 for LOIs [2022-12-14 14:50:28,595 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:50:28,619 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:50:41,195 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3031#(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 14:50:41,195 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:50:41,195 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:50:41,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-12-14 14:50:41,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698357170] [2022-12-14 14:50:41,196 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:50:41,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 14:50:41,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:50:41,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 14:50:41,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2022-12-14 14:50:41,197 INFO L87 Difference]: Start difference. First operand 110 states and 145 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-12-14 14:50:41,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:50:41,374 INFO L93 Difference]: Finished difference Result 230 states and 311 transitions. [2022-12-14 14:50:41,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 14:50:41,374 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 40 [2022-12-14 14:50:41,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:50:41,375 INFO L225 Difference]: With dead ends: 230 [2022-12-14 14:50:41,375 INFO L226 Difference]: Without dead ends: 175 [2022-12-14 14:50:41,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=231, Invalid=1101, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 14:50:41,376 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 88 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:50:41,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 278 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:50:41,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-12-14 14:50:41,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 156. [2022-12-14 14:50:41,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 116 states have (on average 1.2844827586206897) internal successors, (149), 117 states have internal predecessors, (149), 30 states have call successors, (30), 10 states have call predecessors, (30), 9 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2022-12-14 14:50:41,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 208 transitions. [2022-12-14 14:50:41,407 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 208 transitions. Word has length 40 [2022-12-14 14:50:41,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:50:41,408 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 208 transitions. [2022-12-14 14:50:41,408 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-12-14 14:50:41,408 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 208 transitions. [2022-12-14 14:50:41,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-12-14 14:50:41,408 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:50:41,409 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:50:41,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 14:50:41,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 14:50:41,610 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:50:41,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:50:41,612 INFO L85 PathProgramCache]: Analyzing trace with hash 1532401011, now seen corresponding path program 1 times [2022-12-14 14:50:41,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:50:41,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108517667] [2022-12-14 14:50:41,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:41,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:50:41,631 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:50:41,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [614118222] [2022-12-14 14:50:41,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:50:41,633 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:50:41,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:50:41,636 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:50:41,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 14:50:41,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:50:41,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 14:50:41,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:50:41,722 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:50:41,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:50:41,782 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 14:50:41,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:50:41,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108517667] [2022-12-14 14:50:41,783 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:50:41,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614118222] [2022-12-14 14:50:41,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614118222] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:50:41,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1833337256] [2022-12-14 14:50:41,785 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:50:41,785 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:50:41,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:50:41,785 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:50:41,786 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:50:44,737 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 14:50:44,741 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:50:44,763 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:51:01,062 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3905#(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 14:51:01,062 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:51:01,062 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:51:01,062 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-12-14 14:51:01,062 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421387266] [2022-12-14 14:51:01,062 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:51:01,062 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 14:51:01,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:51:01,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 14:51:01,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=937, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 14:51:01,063 INFO L87 Difference]: Start difference. First operand 156 states and 208 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-12-14 14:51:01,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:51:01,302 INFO L93 Difference]: Finished difference Result 252 states and 333 transitions. [2022-12-14 14:51:01,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 14:51:01,303 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2022-12-14 14:51:01,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:51:01,304 INFO L225 Difference]: With dead ends: 252 [2022-12-14 14:51:01,304 INFO L226 Difference]: Without dead ends: 247 [2022-12-14 14:51:01,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=244, Invalid=1316, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 14:51:01,305 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 171 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:51:01,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 234 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 14:51:01,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2022-12-14 14:51:01,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 212. [2022-12-14 14:51:01,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 157 states have (on average 1.286624203821656) internal successors, (202), 162 states have internal predecessors, (202), 43 states have call successors, (43), 12 states have call predecessors, (43), 11 states have return successors, (42), 37 states have call predecessors, (42), 42 states have call successors, (42) [2022-12-14 14:51:01,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 287 transitions. [2022-12-14 14:51:01,355 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 287 transitions. Word has length 46 [2022-12-14 14:51:01,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:51:01,356 INFO L495 AbstractCegarLoop]: Abstraction has 212 states and 287 transitions. [2022-12-14 14:51:01,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-12-14 14:51:01,356 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 287 transitions. [2022-12-14 14:51:01,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-12-14 14:51:01,357 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:51:01,357 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 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] [2022-12-14 14:51:01,362 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 14:51:01,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:51:01,559 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:51:01,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:51:01,560 INFO L85 PathProgramCache]: Analyzing trace with hash -482951008, now seen corresponding path program 1 times [2022-12-14 14:51:01,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:51:01,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923740048] [2022-12-14 14:51:01,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:51:01,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:51:01,582 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:51:01,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [580296831] [2022-12-14 14:51:01,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:51:01,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:51:01,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:51:01,587 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:51:01,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 14:51:01,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:51:01,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 14:51:01,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:51:01,745 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-12-14 14:51:01,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:51:01,988 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-12-14 14:51:01,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:51:01,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923740048] [2022-12-14 14:51:01,988 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:51:01,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580296831] [2022-12-14 14:51:01,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580296831] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:51:01,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1274893784] [2022-12-14 14:51:01,990 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:51:01,990 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:51:01,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:51:01,991 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:51:01,991 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:51:04,607 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-12-14 14:51:04,614 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:51:04,636 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:51:28,500 WARN L233 SmtUtils]: Spent 6.68s on a formula simplification. DAG size of input: 116 DAG size of output: 103 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:51:38,082 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4933#(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 14:51:38,082 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:51:38,082 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:51:38,082 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2022-12-14 14:51:38,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431951190] [2022-12-14 14:51:38,082 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:51:38,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 14:51:38,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:51:38,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 14:51:38,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=929, Unknown=2, NotChecked=0, Total=1056 [2022-12-14 14:51:38,083 INFO L87 Difference]: Start difference. First operand 212 states and 287 transitions. Second operand has 13 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2022-12-14 14:51:40,156 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 14:51:42,287 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 14:51:44,382 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 14:51:44,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:51:44,480 INFO L93 Difference]: Finished difference Result 308 states and 423 transitions. [2022-12-14 14:51:44,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 14:51:44,480 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) Word has length 52 [2022-12-14 14:51:44,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:51:44,483 INFO L225 Difference]: With dead ends: 308 [2022-12-14 14:51:44,483 INFO L226 Difference]: Without dead ends: 218 [2022-12-14 14:51:44,484 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 120 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=141, Invalid=1047, Unknown=2, NotChecked=0, Total=1190 [2022-12-14 14:51:44,484 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 53 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 19 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:51:44,485 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 185 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 214 Invalid, 3 Unknown, 0 Unchecked, 6.3s Time] [2022-12-14 14:51:44,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2022-12-14 14:51:44,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 200. [2022-12-14 14:51:44,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 148 states have (on average 1.2297297297297298) internal successors, (182), 151 states have internal predecessors, (182), 40 states have call successors, (40), 12 states have call predecessors, (40), 11 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2022-12-14 14:51:44,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 261 transitions. [2022-12-14 14:51:44,532 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 261 transitions. Word has length 52 [2022-12-14 14:51:44,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:51:44,532 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 261 transitions. [2022-12-14 14:51:44,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2022-12-14 14:51:44,532 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 261 transitions. [2022-12-14 14:51:44,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 14:51:44,534 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:51:44,535 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 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] [2022-12-14 14:51:44,540 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 14:51:44,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:51:44,736 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:51:44,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:51:44,737 INFO L85 PathProgramCache]: Analyzing trace with hash 80082561, now seen corresponding path program 1 times [2022-12-14 14:51:44,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:51:44,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563044345] [2022-12-14 14:51:44,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:51:44,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:51:44,758 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:51:44,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1358523197] [2022-12-14 14:51:44,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:51:44,759 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:51:44,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:51:44,762 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:51:44,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 14:51:44,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:51:44,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 14:51:44,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:51:44,866 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 64 proven. 12 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-12-14 14:51:44,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:51:44,903 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 38 proven. 12 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2022-12-14 14:51:44,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:51:44,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563044345] [2022-12-14 14:51:44,903 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:51:44,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358523197] [2022-12-14 14:51:44,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358523197] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:51:44,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [370195654] [2022-12-14 14:51:44,905 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:51:44,905 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:51:44,906 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:51:44,906 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:51:44,906 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:51:46,968 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-12-14 14:51:47,003 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:51:47,027 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:51:48,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6191#(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 14:51:48,417 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:51:48,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:51:48,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2022-12-14 14:51:48,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061631030] [2022-12-14 14:51:48,417 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:51:48,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 14:51:48,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:51:48,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 14:51:48,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2022-12-14 14:51:48,418 INFO L87 Difference]: Start difference. First operand 200 states and 261 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-12-14 14:51:48,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:51:48,561 INFO L93 Difference]: Finished difference Result 492 states and 676 transitions. [2022-12-14 14:51:48,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 14:51:48,562 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 82 [2022-12-14 14:51:48,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:51:48,563 INFO L225 Difference]: With dead ends: 492 [2022-12-14 14:51:48,563 INFO L226 Difference]: Without dead ends: 356 [2022-12-14 14:51:48,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2022-12-14 14:51:48,564 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 16 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:51:48,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 115 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:51:48,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2022-12-14 14:51:48,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 345. [2022-12-14 14:51:48,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 259 states have (on average 1.2664092664092663) internal successors, (328), 265 states have internal predecessors, (328), 74 states have call successors, (74), 12 states have call predecessors, (74), 11 states have return successors, (73), 67 states have call predecessors, (73), 73 states have call successors, (73) [2022-12-14 14:51:48,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 475 transitions. [2022-12-14 14:51:48,654 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 475 transitions. Word has length 82 [2022-12-14 14:51:48,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:51:48,654 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 475 transitions. [2022-12-14 14:51:48,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-12-14 14:51:48,654 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 475 transitions. [2022-12-14 14:51:48,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 14:51:48,656 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:51:48,657 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:51:48,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 14:51:48,857 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 14:51:48,857 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:51:48,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:51:48,858 INFO L85 PathProgramCache]: Analyzing trace with hash -595391949, now seen corresponding path program 2 times [2022-12-14 14:51:48,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:51:48,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846143467] [2022-12-14 14:51:48,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:51:48,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:51:48,863 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:51:48,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [559619584] [2022-12-14 14:51:48,863 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:51:48,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:51:48,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:51:48,864 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:51:48,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 14:51:48,925 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 14:51:48,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:51:48,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 14:51:48,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:51:48,939 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-12-14 14:51:48,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 14:51:48,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:51:48,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846143467] [2022-12-14 14:51:48,939 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:51:48,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559619584] [2022-12-14 14:51:48,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559619584] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:51:48,940 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:51:48,940 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 14:51:48,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636713628] [2022-12-14 14:51:48,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:51:48,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 14:51:48,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:51:48,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 14:51:48,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 14:51:48,941 INFO L87 Difference]: Start difference. First operand 345 states and 475 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 14:51:49,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:51:49,082 INFO L93 Difference]: Finished difference Result 591 states and 827 transitions. [2022-12-14 14:51:49,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 14:51:49,083 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 82 [2022-12-14 14:51:49,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:51:49,085 INFO L225 Difference]: With dead ends: 591 [2022-12-14 14:51:49,086 INFO L226 Difference]: Without dead ends: 442 [2022-12-14 14:51:49,086 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 78 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 14:51:49,086 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 17 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:51:49,087 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 133 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:51:49,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2022-12-14 14:51:49,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 375. [2022-12-14 14:51:49,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 284 states have (on average 1.2464788732394365) internal successors, (354), 290 states have internal predecessors, (354), 78 states have call successors, (78), 13 states have call predecessors, (78), 12 states have return successors, (77), 71 states have call predecessors, (77), 77 states have call successors, (77) [2022-12-14 14:51:49,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 509 transitions. [2022-12-14 14:51:49,168 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 509 transitions. Word has length 82 [2022-12-14 14:51:49,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:51:49,168 INFO L495 AbstractCegarLoop]: Abstraction has 375 states and 509 transitions. [2022-12-14 14:51:49,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 14:51:49,168 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 509 transitions. [2022-12-14 14:51:49,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 14:51:49,169 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:51:49,169 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 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] [2022-12-14 14:51:49,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-12-14 14:51:49,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:51:49,371 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:51:49,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:51:49,372 INFO L85 PathProgramCache]: Analyzing trace with hash 23064549, now seen corresponding path program 3 times [2022-12-14 14:51:49,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:51:49,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122266685] [2022-12-14 14:51:49,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:51:49,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:51:49,391 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:51:49,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1120200035] [2022-12-14 14:51:49,392 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:51:49,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:51:49,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:51:49,393 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:51:49,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 14:51:49,531 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:51:49,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:51:49,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2022-12-14 14:51:49,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:51:49,620 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 152 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:51:49,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:51:49,735 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 40 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-12-14 14:51:49,736 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:51:49,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122266685] [2022-12-14 14:51:49,736 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:51:49,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120200035] [2022-12-14 14:51:49,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1120200035] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:51:49,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1519808491] [2022-12-14 14:51:49,738 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:51:49,738 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:51:49,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:51:49,739 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:51:49,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:51:52,987 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 14:51:52,993 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:51:53,021 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:52:00,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9638#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 54) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:52:00,976 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:52:00,976 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:52:00,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-12-14 14:52:00,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982039243] [2022-12-14 14:52:00,977 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:52:00,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 14:52:00,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:52:00,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 14:52:00,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=1515, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 14:52:00,979 INFO L87 Difference]: Start difference. First operand 375 states and 509 transitions. Second operand has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2022-12-14 14:52:01,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:52:01,745 INFO L93 Difference]: Finished difference Result 1151 states and 1656 transitions. [2022-12-14 14:52:01,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 14:52:01,746 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) Word has length 82 [2022-12-14 14:52:01,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:52:01,749 INFO L225 Difference]: With dead ends: 1151 [2022-12-14 14:52:01,749 INFO L226 Difference]: Without dead ends: 1100 [2022-12-14 14:52:01,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1235 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=689, Invalid=2851, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 14:52:01,750 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 359 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 450 SdHoareTripleChecker+Invalid, 450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:52:01,750 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [359 Valid, 450 Invalid, 450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:52:01,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1100 states. [2022-12-14 14:52:02,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1100 to 1040. [2022-12-14 14:52:02,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1040 states, 785 states have (on average 1.2560509554140127) internal successors, (986), 794 states have internal predecessors, (986), 234 states have call successors, (234), 21 states have call predecessors, (234), 20 states have return successors, (233), 224 states have call predecessors, (233), 233 states have call successors, (233) [2022-12-14 14:52:02,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1040 states to 1040 states and 1453 transitions. [2022-12-14 14:52:02,029 INFO L78 Accepts]: Start accepts. Automaton has 1040 states and 1453 transitions. Word has length 82 [2022-12-14 14:52:02,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:52:02,029 INFO L495 AbstractCegarLoop]: Abstraction has 1040 states and 1453 transitions. [2022-12-14 14:52:02,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2022-12-14 14:52:02,030 INFO L276 IsEmpty]: Start isEmpty. Operand 1040 states and 1453 transitions. [2022-12-14 14:52:02,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-12-14 14:52:02,032 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:52:02,032 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:52:02,038 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 14:52:02,232 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 14:52:02,233 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:52:02,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:52:02,233 INFO L85 PathProgramCache]: Analyzing trace with hash -237823764, now seen corresponding path program 1 times [2022-12-14 14:52:02,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:52:02,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611230655] [2022-12-14 14:52:02,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:52:02,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:52:02,247 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:52:02,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [154462215] [2022-12-14 14:52:02,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:52:02,247 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:52:02,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:52:02,248 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:52:02,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 14:52:02,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:52:02,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 21 conjunts are in the unsatisfiable core [2022-12-14 14:52:02,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:52:02,415 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 190 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:52:02,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:52:02,565 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 46 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2022-12-14 14:52:02,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:52:02,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611230655] [2022-12-14 14:52:02,565 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:52:02,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154462215] [2022-12-14 14:52:02,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154462215] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:52:02,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1728739008] [2022-12-14 14:52:02,567 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:52:02,567 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:52:02,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:52:02,567 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:52:02,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:52:05,468 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 14:52:05,471 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:52:05,494 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:52:08,743 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13492#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= ~counter~0 53) (= |#NULL.base| 0))' at error location [2022-12-14 14:52:08,744 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:52:08,744 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:52:08,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2022-12-14 14:52:08,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158872484] [2022-12-14 14:52:08,744 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:52:08,745 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 14:52:08,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:52:08,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 14:52:08,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=1480, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 14:52:08,746 INFO L87 Difference]: Start difference. First operand 1040 states and 1453 transitions. Second operand has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2022-12-14 14:52:09,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:52:09,594 INFO L93 Difference]: Finished difference Result 1518 states and 2107 transitions. [2022-12-14 14:52:09,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 14:52:09,594 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) Word has length 88 [2022-12-14 14:52:09,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:52:09,596 INFO L225 Difference]: With dead ends: 1518 [2022-12-14 14:52:09,596 INFO L226 Difference]: Without dead ends: 820 [2022-12-14 14:52:09,598 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=760, Invalid=2900, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 14:52:09,598 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 358 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 358 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:52:09,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [358 Valid, 497 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:52:09,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 820 states. [2022-12-14 14:52:09,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 820 to 764. [2022-12-14 14:52:09,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 573 states have (on average 1.2076788830715532) internal successors, (692), 578 states have internal predecessors, (692), 168 states have call successors, (168), 23 states have call predecessors, (168), 22 states have return successors, (167), 162 states have call predecessors, (167), 167 states have call successors, (167) [2022-12-14 14:52:09,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 1027 transitions. [2022-12-14 14:52:09,765 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 1027 transitions. Word has length 88 [2022-12-14 14:52:09,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:52:09,765 INFO L495 AbstractCegarLoop]: Abstraction has 764 states and 1027 transitions. [2022-12-14 14:52:09,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2022-12-14 14:52:09,765 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 1027 transitions. [2022-12-14 14:52:09,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-12-14 14:52:09,766 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:52:09,766 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:52:09,770 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 14:52:09,967 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 14:52:09,968 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:52:09,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:52:09,969 INFO L85 PathProgramCache]: Analyzing trace with hash -1700457485, now seen corresponding path program 1 times [2022-12-14 14:52:09,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:52:09,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530775498] [2022-12-14 14:52:09,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:52:09,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:52:09,990 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:52:09,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [116460807] [2022-12-14 14:52:09,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:52:09,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:52:09,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:52:09,993 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:52:09,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 14:52:10,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:52:10,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 14:52:10,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:52:10,210 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 236 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:52:10,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:52:10,408 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-12-14 14:52:10,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:52:10,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530775498] [2022-12-14 14:52:10,409 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:52:10,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116460807] [2022-12-14 14:52:10,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116460807] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:52:10,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [571342592] [2022-12-14 14:52:10,411 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:52:10,411 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:52:10,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:52:10,411 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:52:10,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:52:13,455 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 14:52:13,459 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:52:13,485 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:52:20,955 WARN L233 SmtUtils]: Spent 6.11s on a formula simplification. DAG size of input: 109 DAG size of output: 102 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:52:22,459 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17505#(and (<= ~counter~0 52) (= |__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 14:52:22,460 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:52:22,460 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:52:22,460 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-12-14 14:52:22,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649806930] [2022-12-14 14:52:22,460 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:52:22,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 14:52:22,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:52:22,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 14:52:22,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=457, Invalid=1523, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 14:52:22,462 INFO L87 Difference]: Start difference. First operand 764 states and 1027 transitions. Second operand has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-12-14 14:52:23,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:52:23,270 INFO L93 Difference]: Finished difference Result 875 states and 1183 transitions. [2022-12-14 14:52:23,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 14:52:23,271 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) Word has length 94 [2022-12-14 14:52:23,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:52:23,273 INFO L225 Difference]: With dead ends: 875 [2022-12-14 14:52:23,273 INFO L226 Difference]: Without dead ends: 870 [2022-12-14 14:52:23,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 235 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1354 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=846, Invalid=3060, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 14:52:23,274 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 333 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 507 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:52:23,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [333 Valid, 507 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:52:23,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 870 states. [2022-12-14 14:52:23,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 870 to 855. [2022-12-14 14:52:23,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 855 states, 644 states have (on average 1.1832298136645962) internal successors, (762), 650 states have internal predecessors, (762), 186 states have call successors, (186), 25 states have call predecessors, (186), 24 states have return successors, (185), 179 states have call predecessors, (185), 185 states have call successors, (185) [2022-12-14 14:52:23,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 855 states to 855 states and 1133 transitions. [2022-12-14 14:52:23,506 INFO L78 Accepts]: Start accepts. Automaton has 855 states and 1133 transitions. Word has length 94 [2022-12-14 14:52:23,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:52:23,506 INFO L495 AbstractCegarLoop]: Abstraction has 855 states and 1133 transitions. [2022-12-14 14:52:23,506 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-12-14 14:52:23,507 INFO L276 IsEmpty]: Start isEmpty. Operand 855 states and 1133 transitions. [2022-12-14 14:52:23,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-12-14 14:52:23,509 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:52:23,509 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:52:23,514 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 14:52:23,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 14:52:23,710 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:52:23,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:52:23,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1927158023, now seen corresponding path program 4 times [2022-12-14 14:52:23,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:52:23,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548257201] [2022-12-14 14:52:23,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:52:23,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:52:23,720 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:52:23,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1301299491] [2022-12-14 14:52:23,720 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:52:23,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:52:23,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:52:23,722 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:52:23,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 14:52:23,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:52:23,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 2 conjunts are in the unsatisfiable core [2022-12-14 14:52:23,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:52:23,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 612 proven. 0 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2022-12-14 14:52:23,862 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 14:52:23,863 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:52:23,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548257201] [2022-12-14 14:52:23,863 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:52:23,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301299491] [2022-12-14 14:52:23,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301299491] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:52:23,863 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:52:23,863 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 14:52:23,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685778913] [2022-12-14 14:52:23,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:52:23,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 14:52:23,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:52:23,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 14:52:23,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:52:23,864 INFO L87 Difference]: Start difference. First operand 855 states and 1133 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-12-14 14:52:24,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:52:24,125 INFO L93 Difference]: Finished difference Result 1450 states and 1919 transitions. [2022-12-14 14:52:24,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 14:52:24,126 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 178 [2022-12-14 14:52:24,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:52:24,128 INFO L225 Difference]: With dead ends: 1450 [2022-12-14 14:52:24,128 INFO L226 Difference]: Without dead ends: 919 [2022-12-14 14:52:24,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 14:52:24,129 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 3 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:52:24,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 65 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:52:24,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 919 states. [2022-12-14 14:52:24,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 919 to 846. [2022-12-14 14:52:24,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 846 states, 640 states have (on average 1.171875) internal successors, (750), 649 states have internal predecessors, (750), 181 states have call successors, (181), 25 states have call predecessors, (181), 24 states have return successors, (180), 171 states have call predecessors, (180), 180 states have call successors, (180) [2022-12-14 14:52:24,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 1111 transitions. [2022-12-14 14:52:24,307 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 1111 transitions. Word has length 178 [2022-12-14 14:52:24,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:52:24,307 INFO L495 AbstractCegarLoop]: Abstraction has 846 states and 1111 transitions. [2022-12-14 14:52:24,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-12-14 14:52:24,307 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 1111 transitions. [2022-12-14 14:52:24,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-12-14 14:52:24,310 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:52:24,310 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 9, 8, 8, 8, 8, 7, 7, 7, 6, 5, 5, 5, 5, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:52:24,315 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 14:52:24,510 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 14:52:24,510 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:52:24,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:52:24,511 INFO L85 PathProgramCache]: Analyzing trace with hash -545557597, now seen corresponding path program 5 times [2022-12-14 14:52:24,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:52:24,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270675695] [2022-12-14 14:52:24,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:52:24,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:52:24,518 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:52:24,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1797449679] [2022-12-14 14:52:24,518 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:52:24,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:52:24,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:52:24,519 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:52:24,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 14:52:24,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 14:52:24,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:52:24,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 14:52:24,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:52:24,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1078 backedges. 120 proven. 0 refuted. 0 times theorem prover too weak. 958 trivial. 0 not checked. [2022-12-14 14:52:24,596 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 14:52:24,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:52:24,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270675695] [2022-12-14 14:52:24,596 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:52:24,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797449679] [2022-12-14 14:52:24,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797449679] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 14:52:24,597 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 14:52:24,597 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 14:52:24,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645081616] [2022-12-14 14:52:24,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 14:52:24,598 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 14:52:24,598 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:52:24,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 14:52:24,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 14:52:24,598 INFO L87 Difference]: Start difference. First operand 846 states and 1111 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-12-14 14:52:24,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:52:24,905 INFO L93 Difference]: Finished difference Result 858 states and 1121 transitions. [2022-12-14 14:52:24,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 14:52:24,906 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 178 [2022-12-14 14:52:24,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:52:24,908 INFO L225 Difference]: With dead ends: 858 [2022-12-14 14:52:24,908 INFO L226 Difference]: Without dead ends: 807 [2022-12-14 14:52:24,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 14:52:24,912 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 9 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:52:24,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 79 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 14:52:24,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 807 states. [2022-12-14 14:52:25,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 807 to 792. [2022-12-14 14:52:25,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 792 states, 598 states have (on average 1.1672240802675586) internal successors, (698), 605 states have internal predecessors, (698), 169 states have call successors, (169), 25 states have call predecessors, (169), 24 states have return successors, (168), 161 states have call predecessors, (168), 168 states have call successors, (168) [2022-12-14 14:52:25,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 1035 transitions. [2022-12-14 14:52:25,168 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 1035 transitions. Word has length 178 [2022-12-14 14:52:25,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:52:25,169 INFO L495 AbstractCegarLoop]: Abstraction has 792 states and 1035 transitions. [2022-12-14 14:52:25,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-12-14 14:52:25,169 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 1035 transitions. [2022-12-14 14:52:25,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-12-14 14:52:25,172 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:52:25,173 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:52:25,177 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 14:52:25,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:52:25,373 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:52:25,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:52:25,374 INFO L85 PathProgramCache]: Analyzing trace with hash -1206804251, now seen corresponding path program 6 times [2022-12-14 14:52:25,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:52:25,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449808424] [2022-12-14 14:52:25,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:52:25,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:52:25,381 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:52:25,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2128610537] [2022-12-14 14:52:25,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:52:25,382 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:52:25,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:52:25,383 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:52:25,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 14:52:25,452 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:52:25,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:52:25,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 14:52:25,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:52:25,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 280 proven. 184 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2022-12-14 14:52:25,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:52:25,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 140 proven. 184 refuted. 0 times theorem prover too weak. 782 trivial. 0 not checked. [2022-12-14 14:52:25,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:52:25,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449808424] [2022-12-14 14:52:25,666 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:52:25,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128610537] [2022-12-14 14:52:25,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128610537] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:52:25,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [969486153] [2022-12-14 14:52:25,667 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:52:25,667 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:52:25,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:52:25,668 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:52:25,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:52:29,758 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-12-14 14:52:29,797 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:52:29,823 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:52:38,805 WARN L233 SmtUtils]: Spent 6.79s on a formula simplification. DAG size of input: 59 DAG size of output: 54 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:52:39,280 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28081#(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 14:52:39,280 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:52:39,281 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:52:39,281 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2022-12-14 14:52:39,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719901515] [2022-12-14 14:52:39,281 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:52:39,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 14:52:39,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:52:39,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 14:52:39,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2022-12-14 14:52:39,282 INFO L87 Difference]: Start difference. First operand 792 states and 1035 transitions. Second operand has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2022-12-14 14:52:40,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:52:40,256 INFO L93 Difference]: Finished difference Result 1829 states and 2460 transitions. [2022-12-14 14:52:40,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 14:52:40,256 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) Word has length 178 [2022-12-14 14:52:40,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:52:40,260 INFO L225 Difference]: With dead ends: 1829 [2022-12-14 14:52:40,260 INFO L226 Difference]: Without dead ends: 1606 [2022-12-14 14:52:40,261 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 499 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=190, Invalid=1616, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 14:52:40,261 INFO L413 NwaCegarLoop]: 197 mSDtfsCounter, 122 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 751 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 14:52:40,261 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 751 Invalid, 709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 14:52:40,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1606 states. [2022-12-14 14:52:40,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1606 to 1375. [2022-12-14 14:52:40,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1375 states, 1039 states have (on average 1.1828681424446583) internal successors, (1229), 1055 states have internal predecessors, (1229), 311 states have call successors, (311), 25 states have call predecessors, (311), 24 states have return successors, (310), 294 states have call predecessors, (310), 310 states have call successors, (310) [2022-12-14 14:52:40,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1375 states to 1375 states and 1850 transitions. [2022-12-14 14:52:40,593 INFO L78 Accepts]: Start accepts. Automaton has 1375 states and 1850 transitions. Word has length 178 [2022-12-14 14:52:40,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:52:40,594 INFO L495 AbstractCegarLoop]: Abstraction has 1375 states and 1850 transitions. [2022-12-14 14:52:40,594 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2022-12-14 14:52:40,594 INFO L276 IsEmpty]: Start isEmpty. Operand 1375 states and 1850 transitions. [2022-12-14 14:52:40,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-12-14 14:52:40,597 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:52:40,597 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 10, 9, 9, 9, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:52:40,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 14:52:40,798 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:52:40,799 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:52:40,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:52:40,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1637608141, now seen corresponding path program 7 times [2022-12-14 14:52:40,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:52:40,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711335778] [2022-12-14 14:52:40,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:52:40,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:52:40,833 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:52:40,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1286988862] [2022-12-14 14:52:40,835 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:52:40,835 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:52:40,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:52:40,838 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:52:40,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 14:52:40,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:52:40,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 14:52:40,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:52:41,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 516 proven. 84 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2022-12-14 14:52:41,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:52:41,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 226 proven. 84 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2022-12-14 14:52:41,167 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:52:41,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711335778] [2022-12-14 14:52:41,167 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:52:41,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1286988862] [2022-12-14 14:52:41,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1286988862] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:52:41,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1676715950] [2022-12-14 14:52:41,169 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:52:41,169 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:52:41,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:52:41,170 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:52:41,170 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:52:43,102 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-12-14 14:52:43,136 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:52:43,156 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:52:45,191 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33982#(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 14:52:45,191 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:52:45,191 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:52:45,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-12-14 14:52:45,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504344145] [2022-12-14 14:52:45,191 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:52:45,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 14:52:45,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:52:45,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 14:52:45,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 14:52:45,193 INFO L87 Difference]: Start difference. First operand 1375 states and 1850 transitions. Second operand has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2022-12-14 14:52:46,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:52:46,860 INFO L93 Difference]: Finished difference Result 2960 states and 4046 transitions. [2022-12-14 14:52:46,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 14:52:46,861 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) Word has length 178 [2022-12-14 14:52:46,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:52:46,867 INFO L225 Difference]: With dead ends: 2960 [2022-12-14 14:52:46,867 INFO L226 Difference]: Without dead ends: 2637 [2022-12-14 14:52:46,868 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 525 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=448, Invalid=2744, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 14:52:46,869 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 203 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 704 SdHoareTripleChecker+Invalid, 849 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 14:52:46,869 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 704 Invalid, 849 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 14:52:46,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2637 states. [2022-12-14 14:52:47,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2637 to 2039. [2022-12-14 14:52:47,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2039 states, 1536 states have (on average 1.1725260416666667) internal successors, (1801), 1564 states have internal predecessors, (1801), 478 states have call successors, (478), 25 states have call predecessors, (478), 24 states have return successors, (477), 449 states have call predecessors, (477), 477 states have call successors, (477) [2022-12-14 14:52:47,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2039 states to 2039 states and 2756 transitions. [2022-12-14 14:52:47,414 INFO L78 Accepts]: Start accepts. Automaton has 2039 states and 2756 transitions. Word has length 178 [2022-12-14 14:52:47,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:52:47,414 INFO L495 AbstractCegarLoop]: Abstraction has 2039 states and 2756 transitions. [2022-12-14 14:52:47,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2022-12-14 14:52:47,415 INFO L276 IsEmpty]: Start isEmpty. Operand 2039 states and 2756 transitions. [2022-12-14 14:52:47,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-12-14 14:52:47,421 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:52:47,421 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:52:47,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 14:52:47,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 14:52:47,622 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:52:47,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:52:47,622 INFO L85 PathProgramCache]: Analyzing trace with hash 270232805, now seen corresponding path program 8 times [2022-12-14 14:52:47,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:52:47,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008277728] [2022-12-14 14:52:47,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:52:47,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:52:47,629 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:52:47,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [57283505] [2022-12-14 14:52:47,630 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:52:47,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:52:47,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:52:47,631 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:52:47,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 14:52:48,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 14:52:48,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:52:48,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 17 conjunts are in the unsatisfiable core [2022-12-14 14:52:48,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:52:48,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 248 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2022-12-14 14:52:48,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:52:48,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 248 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2022-12-14 14:52:48,901 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:52:48,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008277728] [2022-12-14 14:52:48,901 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:52:48,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57283505] [2022-12-14 14:52:48,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57283505] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:52:48,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [616573441] [2022-12-14 14:52:48,903 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:52:48,903 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:52:48,903 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:52:48,903 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:52:48,903 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:52:52,354 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-12-14 14:52:52,393 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:52:52,416 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:52:57,257 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42638#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:52:57,257 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:52:57,258 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:52:57,258 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2022-12-14 14:52:57,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105418376] [2022-12-14 14:52:57,258 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:52:57,259 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 14:52:57,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:52:57,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 14:52:57,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1204, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 14:52:57,260 INFO L87 Difference]: Start difference. First operand 2039 states and 2756 transitions. Second operand has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) [2022-12-14 14:53:00,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:53:00,271 INFO L93 Difference]: Finished difference Result 3587 states and 4919 transitions. [2022-12-14 14:53:00,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-14 14:53:00,271 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) Word has length 178 [2022-12-14 14:53:00,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:53:00,279 INFO L225 Difference]: With dead ends: 3587 [2022-12-14 14:53:00,279 INFO L226 Difference]: Without dead ends: 3276 [2022-12-14 14:53:00,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 495 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=506, Invalid=4464, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 14:53:00,281 INFO L413 NwaCegarLoop]: 335 mSDtfsCounter, 310 mSDsluCounter, 1264 mSDsCounter, 0 mSdLazyCounter, 1598 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 1599 SdHoareTripleChecker+Invalid, 1808 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 1598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:53:00,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [318 Valid, 1599 Invalid, 1808 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 1598 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 14:53:00,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3276 states. [2022-12-14 14:53:01,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3276 to 2581. [2022-12-14 14:53:01,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2581 states, 1946 states have (on average 1.183967112024666) internal successors, (2304), 1988 states have internal predecessors, (2304), 610 states have call successors, (610), 25 states have call predecessors, (610), 24 states have return successors, (609), 567 states have call predecessors, (609), 609 states have call successors, (609) [2022-12-14 14:53:01,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2581 states to 2581 states and 3523 transitions. [2022-12-14 14:53:01,017 INFO L78 Accepts]: Start accepts. Automaton has 2581 states and 3523 transitions. Word has length 178 [2022-12-14 14:53:01,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:53:01,017 INFO L495 AbstractCegarLoop]: Abstraction has 2581 states and 3523 transitions. [2022-12-14 14:53:01,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) [2022-12-14 14:53:01,017 INFO L276 IsEmpty]: Start isEmpty. Operand 2581 states and 3523 transitions. [2022-12-14 14:53:01,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-12-14 14:53:01,022 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:53:01,022 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:53:01,029 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 14:53:01,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:53:01,223 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:53:01,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:53:01,223 INFO L85 PathProgramCache]: Analyzing trace with hash 1152465125, now seen corresponding path program 9 times [2022-12-14 14:53:01,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:53:01,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546602802] [2022-12-14 14:53:01,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:53:01,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:53:01,230 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:53:01,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [315168946] [2022-12-14 14:53:01,231 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:53:01,231 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:53:01,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:53:01,231 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:53:01,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 14:53:01,477 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:53:01,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:53:01,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 43 conjunts are in the unsatisfiable core [2022-12-14 14:53:01,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:53:01,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 1044 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:53:01,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:53:02,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 284 refuted. 0 times theorem prover too weak. 762 trivial. 0 not checked. [2022-12-14 14:53:02,201 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:53:02,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546602802] [2022-12-14 14:53:02,202 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:53:02,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315168946] [2022-12-14 14:53:02,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315168946] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:53:02,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1480965835] [2022-12-14 14:53:02,203 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:53:02,203 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:53:02,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:53:02,203 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:53:02,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:53:04,843 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-12-14 14:53:04,884 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:53:04,911 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:53:06,861 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53092#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-12-14 14:53:06,861 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:53:06,861 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:53:06,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24] total 46 [2022-12-14 14:53:06,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051554645] [2022-12-14 14:53:06,862 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:53:06,862 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 14:53:06,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:53:06,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 14:53:06,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=2918, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 14:53:06,866 INFO L87 Difference]: Start difference. First operand 2581 states and 3523 transitions. Second operand has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2022-12-14 14:53:12,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:53:12,201 INFO L93 Difference]: Finished difference Result 10562 states and 15878 transitions. [2022-12-14 14:53:12,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-12-14 14:53:12,203 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) Word has length 178 [2022-12-14 14:53:12,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:53:12,227 INFO L225 Difference]: With dead ends: 10562 [2022-12-14 14:53:12,227 INFO L226 Difference]: Without dead ends: 10459 [2022-12-14 14:53:12,230 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3073 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2982, Invalid=7938, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 14:53:12,231 INFO L413 NwaCegarLoop]: 144 mSDtfsCounter, 854 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 818 mSolverCounterSat, 381 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 854 SdHoareTripleChecker+Valid, 861 SdHoareTripleChecker+Invalid, 1199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 381 IncrementalHoareTripleChecker+Valid, 818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 14:53:12,231 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [854 Valid, 861 Invalid, 1199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [381 Valid, 818 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 14:53:12,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10459 states. [2022-12-14 14:53:15,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10459 to 10204. [2022-12-14 14:53:15,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10204 states, 7669 states have (on average 1.2558351805972094) internal successors, (9631), 7732 states have internal predecessors, (9631), 2490 states have call successors, (2490), 45 states have call predecessors, (2490), 44 states have return successors, (2489), 2426 states have call predecessors, (2489), 2489 states have call successors, (2489) [2022-12-14 14:53:15,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10204 states to 10204 states and 14610 transitions. [2022-12-14 14:53:15,417 INFO L78 Accepts]: Start accepts. Automaton has 10204 states and 14610 transitions. Word has length 178 [2022-12-14 14:53:15,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:53:15,418 INFO L495 AbstractCegarLoop]: Abstraction has 10204 states and 14610 transitions. [2022-12-14 14:53:15,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2022-12-14 14:53:15,418 INFO L276 IsEmpty]: Start isEmpty. Operand 10204 states and 14610 transitions. [2022-12-14 14:53:15,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2022-12-14 14:53:15,423 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:53:15,423 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 10, 10, 10, 10, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:53:15,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 14:53:15,623 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:53:15,624 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:53:15,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:53:15,626 INFO L85 PathProgramCache]: Analyzing trace with hash 859624940, now seen corresponding path program 2 times [2022-12-14 14:53:15,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:53:15,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201857860] [2022-12-14 14:53:15,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:53:15,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:53:15,636 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:53:15,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [647939391] [2022-12-14 14:53:15,636 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:53:15,636 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:53:15,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:53:15,637 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:53:15,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 14:53:16,728 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-12-14 14:53:16,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:53:16,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 45 conjunts are in the unsatisfiable core [2022-12-14 14:53:16,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:53:16,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 1142 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:53:16,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:53:17,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 302 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2022-12-14 14:53:17,530 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:53:17,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201857860] [2022-12-14 14:53:17,530 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:53:17,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647939391] [2022-12-14 14:53:17,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [647939391] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:53:17,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2130551675] [2022-12-14 14:53:17,532 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:53:17,532 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:53:17,532 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:53:17,532 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:53:17,532 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:53:20,010 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 14:53:20,014 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:53:20,035 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:53:23,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85448#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= ~counter~0 53) (= |#NULL.base| 0))' at error location [2022-12-14 14:53:23,436 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:53:23,436 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:53:23,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 48 [2022-12-14 14:53:23,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916012678] [2022-12-14 14:53:23,436 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:53:23,437 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 14:53:23,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:53:23,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 14:53:23,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=3220, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 14:53:23,441 INFO L87 Difference]: Start difference. First operand 10204 states and 14610 transitions. Second operand has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2022-12-14 14:53:27,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:53:27,705 INFO L93 Difference]: Finished difference Result 15319 states and 22102 transitions. [2022-12-14 14:53:27,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-12-14 14:53:27,706 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) Word has length 184 [2022-12-14 14:53:27,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:53:27,723 INFO L225 Difference]: With dead ends: 15319 [2022-12-14 14:53:27,723 INFO L226 Difference]: Without dead ends: 7786 [2022-12-14 14:53:27,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 484 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3286 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3160, Invalid=8612, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 14:53:27,734 INFO L413 NwaCegarLoop]: 150 mSDtfsCounter, 1090 mSDsluCounter, 832 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 519 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1090 SdHoareTripleChecker+Valid, 982 SdHoareTripleChecker+Invalid, 1333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 519 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 14:53:27,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1090 Valid, 982 Invalid, 1333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [519 Valid, 814 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 14:53:27,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7786 states. [2022-12-14 14:53:29,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7786 to 7555. [2022-12-14 14:53:29,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7555 states, 5667 states have (on average 1.1838715369684136) internal successors, (6709), 5715 states have internal predecessors, (6709), 1841 states have call successors, (1841), 47 states have call predecessors, (1841), 46 states have return successors, (1840), 1792 states have call predecessors, (1840), 1840 states have call successors, (1840) [2022-12-14 14:53:29,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7555 states to 7555 states and 10390 transitions. [2022-12-14 14:53:29,999 INFO L78 Accepts]: Start accepts. Automaton has 7555 states and 10390 transitions. Word has length 184 [2022-12-14 14:53:29,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:53:29,999 INFO L495 AbstractCegarLoop]: Abstraction has 7555 states and 10390 transitions. [2022-12-14 14:53:29,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2022-12-14 14:53:29,999 INFO L276 IsEmpty]: Start isEmpty. Operand 7555 states and 10390 transitions. [2022-12-14 14:53:30,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2022-12-14 14:53:30,012 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:53:30,012 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 10, 10, 10, 10, 8, 8, 8, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:53:30,018 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 14:53:30,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 14:53:30,214 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:53:30,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:53:30,215 INFO L85 PathProgramCache]: Analyzing trace with hash 1661800691, now seen corresponding path program 2 times [2022-12-14 14:53:30,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:53:30,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252723580] [2022-12-14 14:53:30,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:53:30,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:53:30,243 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:53:30,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [632191615] [2022-12-14 14:53:30,244 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:53:30,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:53:30,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:53:30,247 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:53:30,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 14:53:31,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-12-14 14:53:31,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:53:31,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 47 conjunts are in the unsatisfiable core [2022-12-14 14:53:31,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:53:31,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 1248 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:53:31,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:53:32,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 324 refuted. 0 times theorem prover too weak. 926 trivial. 0 not checked. [2022-12-14 14:53:32,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:53:32,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252723580] [2022-12-14 14:53:32,383 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:53:32,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632191615] [2022-12-14 14:53:32,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632191615] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:53:32,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1138958254] [2022-12-14 14:53:32,384 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:53:32,384 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:53:32,384 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:53:32,384 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:53:32,384 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:53:36,709 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 14:53:36,713 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:53:36,730 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:53:41,499 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '120993#(and (<= ~counter~0 52) (= |__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 14:53:41,499 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:53:41,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:53:41,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2022-12-14 14:53:41,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693724791] [2022-12-14 14:53:41,500 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:53:41,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 14:53:41,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:53:41,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 14:53:41,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1429, Invalid=3263, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 14:53:41,502 INFO L87 Difference]: Start difference. First operand 7555 states and 10390 transitions. Second operand has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-12-14 14:53:46,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:53:46,412 INFO L93 Difference]: Finished difference Result 8195 states and 11310 transitions. [2022-12-14 14:53:46,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-12-14 14:53:46,414 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) Word has length 190 [2022-12-14 14:53:46,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:53:46,428 INFO L225 Difference]: With dead ends: 8195 [2022-12-14 14:53:46,428 INFO L226 Difference]: Without dead ends: 8048 [2022-12-14 14:53:46,430 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 497 SyntacticMatches, 4 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=3342, Invalid=8868, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 14:53:46,431 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 877 mSDsluCounter, 794 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 603 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 877 SdHoareTripleChecker+Valid, 950 SdHoareTripleChecker+Invalid, 1280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 603 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 14:53:46,431 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [877 Valid, 950 Invalid, 1280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [603 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 14:53:46,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8048 states. [2022-12-14 14:53:48,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8048 to 7339. [2022-12-14 14:53:48,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7339 states, 5514 states have (on average 1.1267682263329706) internal successors, (6213), 5558 states have internal predecessors, (6213), 1776 states have call successors, (1776), 49 states have call predecessors, (1776), 48 states have return successors, (1775), 1731 states have call predecessors, (1775), 1775 states have call successors, (1775) [2022-12-14 14:53:48,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7339 states to 7339 states and 9764 transitions. [2022-12-14 14:53:48,536 INFO L78 Accepts]: Start accepts. Automaton has 7339 states and 9764 transitions. Word has length 190 [2022-12-14 14:53:48,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:53:48,536 INFO L495 AbstractCegarLoop]: Abstraction has 7339 states and 9764 transitions. [2022-12-14 14:53:48,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-12-14 14:53:48,537 INFO L276 IsEmpty]: Start isEmpty. Operand 7339 states and 9764 transitions. [2022-12-14 14:53:48,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-12-14 14:53:48,549 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:53:48,549 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:53:48,557 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 14:53:48,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:53:48,750 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:53:48,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:53:48,750 INFO L85 PathProgramCache]: Analyzing trace with hash -1362279951, now seen corresponding path program 10 times [2022-12-14 14:53:48,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:53:48,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447363075] [2022-12-14 14:53:48,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:53:48,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:53:48,762 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:53:48,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1125619782] [2022-12-14 14:53:48,762 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:53:48,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:53:48,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:53:48,763 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:53:48,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 14:53:48,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:53:48,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 14:53:48,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:53:49,231 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 416 proven. 1164 refuted. 0 times theorem prover too weak. 3690 trivial. 0 not checked. [2022-12-14 14:53:49,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:53:49,860 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 266 proven. 1204 refuted. 0 times theorem prover too weak. 3800 trivial. 0 not checked. [2022-12-14 14:53:49,860 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:53:49,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447363075] [2022-12-14 14:53:49,860 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:53:49,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125619782] [2022-12-14 14:53:49,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125619782] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:53:49,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1759074727] [2022-12-14 14:53:49,862 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:53:49,862 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:53:49,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:53:49,862 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:53:49,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:53:51,569 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-12-14 14:53:51,621 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:53:51,639 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:53:53,722 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '146596#(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 14:53:53,722 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:53:53,722 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:53:53,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 32 [2022-12-14 14:53:53,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769418968] [2022-12-14 14:53:53,723 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:53:53,723 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 14:53:53,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:53:53,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 14:53:53,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2365, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 14:53:53,724 INFO L87 Difference]: Start difference. First operand 7339 states and 9764 transitions. Second operand has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2022-12-14 14:53:58,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:53:58,776 INFO L93 Difference]: Finished difference Result 10729 states and 14284 transitions. [2022-12-14 14:53:58,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 14:53:58,776 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) Word has length 370 [2022-12-14 14:53:58,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:53:58,793 INFO L225 Difference]: With dead ends: 10729 [2022-12-14 14:53:58,793 INFO L226 Difference]: Without dead ends: 8971 [2022-12-14 14:53:58,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1136 GetRequests, 1057 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=581, Invalid=5581, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 14:53:58,797 INFO L413 NwaCegarLoop]: 303 mSDtfsCounter, 390 mSDsluCounter, 2716 mSDsCounter, 0 mSdLazyCounter, 3291 mSolverCounterSat, 211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 3019 SdHoareTripleChecker+Invalid, 3502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 211 IncrementalHoareTripleChecker+Valid, 3291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-12-14 14:53:58,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [396 Valid, 3019 Invalid, 3502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [211 Valid, 3291 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-12-14 14:53:58,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8971 states. [2022-12-14 14:54:01,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8971 to 7452. [2022-12-14 14:54:01,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7452 states, 5599 states have (on average 1.1269869619574924) internal successors, (6310), 5644 states have internal predecessors, (6310), 1804 states have call successors, (1804), 49 states have call predecessors, (1804), 48 states have return successors, (1803), 1758 states have call predecessors, (1803), 1803 states have call successors, (1803) [2022-12-14 14:54:01,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7452 states to 7452 states and 9917 transitions. [2022-12-14 14:54:01,197 INFO L78 Accepts]: Start accepts. Automaton has 7452 states and 9917 transitions. Word has length 370 [2022-12-14 14:54:01,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:54:01,198 INFO L495 AbstractCegarLoop]: Abstraction has 7452 states and 9917 transitions. [2022-12-14 14:54:01,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2022-12-14 14:54:01,198 INFO L276 IsEmpty]: Start isEmpty. Operand 7452 states and 9917 transitions. [2022-12-14 14:54:01,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-12-14 14:54:01,218 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:54:01,218 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:54:01,223 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 14:54:01,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 14:54:01,419 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:54:01,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:54:01,419 INFO L85 PathProgramCache]: Analyzing trace with hash 1162611185, now seen corresponding path program 11 times [2022-12-14 14:54:01,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:54:01,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831192091] [2022-12-14 14:54:01,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:54:01,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:54:01,435 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:54:01,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [918681103] [2022-12-14 14:54:01,435 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:54:01,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:54:01,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:54:01,436 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:54:01,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 14:54:05,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-12-14 14:54:05,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:54:05,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 764 conjuncts, 27 conjunts are in the unsatisfiable core [2022-12-14 14:54:05,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:54:06,184 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 176 proven. 1280 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2022-12-14 14:54:06,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:54:06,583 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 236 proven. 1220 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2022-12-14 14:54:06,583 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:54:06,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831192091] [2022-12-14 14:54:06,583 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:54:06,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918681103] [2022-12-14 14:54:06,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918681103] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:54:06,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1413481760] [2022-12-14 14:54:06,584 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:54:06,584 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:54:06,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:54:06,584 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:54:06,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:54:09,200 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 14:54:09,203 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:54:09,224 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:54:19,236 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '176128#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 54) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:54:19,237 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:54:19,237 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:54:19,237 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 25 [2022-12-14 14:54:19,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169691450] [2022-12-14 14:54:19,237 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:54:19,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 14:54:19,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:54:19,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 14:54:19,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1990, Unknown=1, NotChecked=0, Total=2162 [2022-12-14 14:54:19,240 INFO L87 Difference]: Start difference. First operand 7452 states and 9917 transitions. Second operand has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) [2022-12-14 14:54:34,561 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-12-14 14:54:36,563 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-12-14 14:54:38,590 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-12-14 14:54:40,603 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-12-14 14:54:42,632 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-12-14 14:54:44,407 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.77s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-12-14 14:54:47,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:54:47,908 INFO L93 Difference]: Finished difference Result 29989 states and 40448 transitions. [2022-12-14 14:54:47,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-12-14 14:54:47,908 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) Word has length 370 [2022-12-14 14:54:47,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:54:47,957 INFO L225 Difference]: With dead ends: 29989 [2022-12-14 14:54:47,957 INFO L226 Difference]: Without dead ends: 28150 [2022-12-14 14:54:47,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1209 GetRequests, 1054 SyntacticMatches, 9 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6993 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=1797, Invalid=19958, Unknown=1, NotChecked=0, Total=21756 [2022-12-14 14:54:47,966 INFO L413 NwaCegarLoop]: 588 mSDtfsCounter, 869 mSDsluCounter, 3339 mSDsCounter, 0 mSdLazyCounter, 5465 mSolverCounterSat, 502 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 878 SdHoareTripleChecker+Valid, 3927 SdHoareTripleChecker+Invalid, 5972 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 502 IncrementalHoareTripleChecker+Valid, 5465 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:54:47,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [878 Valid, 3927 Invalid, 5972 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [502 Valid, 5465 Invalid, 5 Unknown, 0 Unchecked, 15.0s Time] [2022-12-14 14:54:47,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28150 states. [2022-12-14 14:54:54,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28150 to 19145. [2022-12-14 14:54:54,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19145 states, 14375 states have (on average 1.1407304347826086) internal successors, (16398), 14491 states have internal predecessors, (16398), 4721 states have call successors, (4721), 49 states have call predecessors, (4721), 48 states have return successors, (4720), 4604 states have call predecessors, (4720), 4720 states have call successors, (4720) [2022-12-14 14:54:54,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19145 states to 19145 states and 25839 transitions. [2022-12-14 14:54:54,726 INFO L78 Accepts]: Start accepts. Automaton has 19145 states and 25839 transitions. Word has length 370 [2022-12-14 14:54:54,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:54:54,726 INFO L495 AbstractCegarLoop]: Abstraction has 19145 states and 25839 transitions. [2022-12-14 14:54:54,726 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) [2022-12-14 14:54:54,726 INFO L276 IsEmpty]: Start isEmpty. Operand 19145 states and 25839 transitions. [2022-12-14 14:54:54,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-12-14 14:54:54,780 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:54:54,780 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:54:54,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-12-14 14:54:54,981 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 14:54:54,982 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:54:54,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:54:54,984 INFO L85 PathProgramCache]: Analyzing trace with hash 1350397425, now seen corresponding path program 12 times [2022-12-14 14:54:54,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:54:54,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356181299] [2022-12-14 14:54:54,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:54:54,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:54:55,020 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:54:55,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [675227393] [2022-12-14 14:54:55,021 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:54:55,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:54:55,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:54:55,022 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:54:55,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 14:54:55,204 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:54:55,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:54:55,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 142 conjunts are in the unsatisfiable core [2022-12-14 14:54:55,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:55:00,640 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 2814 proven. 759 refuted. 0 times theorem prover too weak. 1697 trivial. 0 not checked. [2022-12-14 14:55:00,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:55:02,987 WARN L837 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~v~0#1| Int) (|ULTIMATE.start_main_~r~0#1| Int)) (not (= (+ (* |c_ULTIMATE.start_main_~u~0#1| |c_ULTIMATE.start_main_~u~0#1|) (* 2 |ULTIMATE.start_main_~v~0#1|)) (+ (* |ULTIMATE.start_main_~r~0#1| 4) (* |c_ULTIMATE.start_main_~u~0#1| 2) (* |ULTIMATE.start_main_~v~0#1| |ULTIMATE.start_main_~v~0#1|) (* |c_ULTIMATE.start_main_~A~0#1| 4))))) is different from false [2022-12-14 14:55:02,989 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:55:02,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356181299] [2022-12-14 14:55:02,989 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:55:02,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675227393] [2022-12-14 14:55:02,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675227393] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:55:02,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [215757612] [2022-12-14 14:55:02,990 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:55:02,990 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:55:02,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:55:02,990 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:55:02,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:55:05,732 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 14:55:05,737 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:55:05,757 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:55:14,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '251387#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 54) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:55:14,468 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:55:14,468 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-12-14 14:55:14,469 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2022-12-14 14:55:14,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388277356] [2022-12-14 14:55:14,469 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-12-14 14:55:14,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 14:55:14,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:55:14,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 14:55:14,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=2082, Unknown=1, NotChecked=92, Total=2352 [2022-12-14 14:55:14,470 INFO L87 Difference]: Start difference. First operand 19145 states and 25839 transitions. Second operand has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) [2022-12-14 14:55:32,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:55:32,537 INFO L93 Difference]: Finished difference Result 21945 states and 29509 transitions. [2022-12-14 14:55:32,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 14:55:32,538 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) Word has length 370 [2022-12-14 14:55:32,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:55:32,582 INFO L225 Difference]: With dead ends: 21945 [2022-12-14 14:55:32,583 INFO L226 Difference]: Without dead ends: 19826 [2022-12-14 14:55:32,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 776 GetRequests, 727 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 673 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=184, Invalid=2171, Unknown=1, NotChecked=94, Total=2450 [2022-12-14 14:55:32,592 INFO L413 NwaCegarLoop]: 178 mSDtfsCounter, 111 mSDsluCounter, 1951 mSDsCounter, 0 mSdLazyCounter, 2700 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 2129 SdHoareTripleChecker+Invalid, 2741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 2700 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:55:32,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 2129 Invalid, 2741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 2700 Invalid, 0 Unknown, 0 Unchecked, 11.0s Time] [2022-12-14 14:55:32,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19826 states. [2022-12-14 14:55:39,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19826 to 18745. [2022-12-14 14:55:39,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18745 states, 14075 states have (on average 1.1420248667850799) internal successors, (16074), 14191 states have internal predecessors, (16074), 4621 states have call successors, (4621), 49 states have call predecessors, (4621), 48 states have return successors, (4620), 4504 states have call predecessors, (4620), 4620 states have call successors, (4620) [2022-12-14 14:55:39,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18745 states to 18745 states and 25315 transitions. [2022-12-14 14:55:39,450 INFO L78 Accepts]: Start accepts. Automaton has 18745 states and 25315 transitions. Word has length 370 [2022-12-14 14:55:39,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:55:39,451 INFO L495 AbstractCegarLoop]: Abstraction has 18745 states and 25315 transitions. [2022-12-14 14:55:39,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) [2022-12-14 14:55:39,451 INFO L276 IsEmpty]: Start isEmpty. Operand 18745 states and 25315 transitions. [2022-12-14 14:55:39,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-12-14 14:55:39,478 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:55:39,478 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:55:39,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-12-14 14:55:39,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 14:55:39,679 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:55:39,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:55:39,680 INFO L85 PathProgramCache]: Analyzing trace with hash 2037070321, now seen corresponding path program 13 times [2022-12-14 14:55:39,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:55:39,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18858558] [2022-12-14 14:55:39,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:55:39,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:55:39,713 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:55:39,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [117843806] [2022-12-14 14:55:39,713 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:55:39,714 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:55:39,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:55:39,714 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:55:39,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 14:55:39,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:55:39,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 91 conjunts are in the unsatisfiable core [2022-12-14 14:55:39,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:55:40,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 138 proven. 5130 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 14:55:40,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:55:41,369 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 138 proven. 1346 refuted. 0 times theorem prover too weak. 3786 trivial. 0 not checked. [2022-12-14 14:55:41,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:55:41,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18858558] [2022-12-14 14:55:41,370 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 14:55:41,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117843806] [2022-12-14 14:55:41,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117843806] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:55:41,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1060311452] [2022-12-14 14:55:41,371 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 14:55:41,371 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:55:41,372 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:55:41,372 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:55:41,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:55:44,536 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-12-14 14:55:44,539 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-12-14 14:55:44,558 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:55:52,083 WARN L233 SmtUtils]: Spent 5.43s on a formula simplification. DAG size of input: 108 DAG size of output: 100 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 14:55:55,285 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '314720#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 54) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 14:55:55,285 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:55:55,285 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 14:55:55,285 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 48] total 54 [2022-12-14 14:55:55,286 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120996924] [2022-12-14 14:55:55,286 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 14:55:55,286 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 14:55:55,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:55:55,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 14:55:55,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1673, Invalid=4027, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 14:55:55,289 INFO L87 Difference]: Start difference. First operand 18745 states and 25315 transitions. Second operand has 54 states, 54 states have (on average 6.203703703703703) internal successors, (335), 54 states have internal predecessors, (335), 51 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 50 states have call predecessors, (92), 50 states have call successors, (92) [2022-12-14 14:56:05,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:56:05,435 INFO L93 Difference]: Finished difference Result 23175 states and 32169 transitions. [2022-12-14 14:56:05,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2022-12-14 14:56:05,436 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 6.203703703703703) internal successors, (335), 54 states have internal predecessors, (335), 51 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 50 states have call predecessors, (92), 50 states have call successors, (92) Word has length 370 [2022-12-14 14:56:05,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:56:05,470 INFO L225 Difference]: With dead ends: 23175 [2022-12-14 14:56:05,470 INFO L226 Difference]: Without dead ends: 23072 [2022-12-14 14:56:05,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1156 GetRequests, 994 SyntacticMatches, 40 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4641 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=4165, Invalid=11087, Unknown=0, NotChecked=0, Total=15252 [2022-12-14 14:56:05,475 INFO L413 NwaCegarLoop]: 168 mSDtfsCounter, 613 mSDsluCounter, 708 mSDsCounter, 0 mSdLazyCounter, 818 mSolverCounterSat, 350 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 613 SdHoareTripleChecker+Valid, 876 SdHoareTripleChecker+Invalid, 1168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 350 IncrementalHoareTripleChecker+Valid, 818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 14:56:05,475 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [613 Valid, 876 Invalid, 1168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [350 Valid, 818 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 14:56:05,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23072 states. [2022-12-14 14:56:13,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23072 to 22758. [2022-12-14 14:56:13,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22758 states, 17098 states have (on average 1.1601941747572815) internal successors, (19837), 17221 states have internal predecessors, (19837), 5607 states have call successors, (5607), 53 states have call predecessors, (5607), 52 states have return successors, (5606), 5483 states have call predecessors, (5606), 5606 states have call successors, (5606) [2022-12-14 14:56:13,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22758 states to 22758 states and 31050 transitions. [2022-12-14 14:56:13,903 INFO L78 Accepts]: Start accepts. Automaton has 22758 states and 31050 transitions. Word has length 370 [2022-12-14 14:56:13,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:56:13,903 INFO L495 AbstractCegarLoop]: Abstraction has 22758 states and 31050 transitions. [2022-12-14 14:56:13,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 6.203703703703703) internal successors, (335), 54 states have internal predecessors, (335), 51 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 50 states have call predecessors, (92), 50 states have call successors, (92) [2022-12-14 14:56:13,904 INFO L276 IsEmpty]: Start isEmpty. Operand 22758 states and 31050 transitions. [2022-12-14 14:56:13,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2022-12-14 14:56:13,931 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:56:13,931 INFO L195 NwaCegarLoop]: trace histogram [46, 45, 45, 19, 19, 19, 19, 18, 17, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 14:56:13,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-12-14 14:56:14,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 14:56:14,133 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:56:14,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:56:14,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1905162744, now seen corresponding path program 3 times [2022-12-14 14:56:14,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:56:14,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276832779] [2022-12-14 14:56:14,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:56:14,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:56:14,171 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 14:56:14,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [830515246] [2022-12-14 14:56:14,171 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:56:14,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:56:14,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:56:14,172 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:56:14,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_424b03dd-a7f4-47f0-9a3a-e6e76be16903/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 14:56:14,300 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:56:14,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:56:14,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 102 conjunts are in the unsatisfiable core [2022-12-14 14:56:14,310 INFO L286 TraceCheckSpWp]: Computing forward predicates...