./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_valuebound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_valuebound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --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 6c4c876bf3d38b01f54a088b76131bc8275dc44ae3ac622f7c3187fe3c7bf156 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:24:47,523 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:24:47,605 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:24:47,610 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:24:47,611 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:24:47,640 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:24:47,641 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:24:47,642 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:24:47,643 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:24:47,643 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:24:47,644 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:24:47,645 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:24:47,645 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:24:47,646 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:24:47,646 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:24:47,647 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:24:47,647 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:24:47,648 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:24:47,649 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:24:47,649 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:24:47,650 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:24:47,651 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:24:47,652 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:24:47,653 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:24:47,653 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:24:47,654 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:24:47,654 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:24:47,655 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:24:47,656 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:24:47,656 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:24:47,657 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:24:47,658 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:24:47,658 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:24:47,659 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:24:47,660 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:24:47,660 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:24:47,661 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:24:47,661 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:24:47,662 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:24:47,662 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:24:47,663 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:24:47,664 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:24:47,664 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:24:47,665 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:24:47,665 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:24:47,666 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6c4c876bf3d38b01f54a088b76131bc8275dc44ae3ac622f7c3187fe3c7bf156 [2023-11-19 05:24:48,050 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:24:48,083 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:24:48,086 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:24:48,088 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:24:48,089 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:24:48,091 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_valuebound10.c [2023-11-19 05:24:51,175 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:24:51,367 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:24:51,368 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_valuebound10.c [2023-11-19 05:24:51,375 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/data/256940d30/4054b6ab05b344af954fae6fb05d9757/FLAG3e95b4f96 [2023-11-19 05:24:51,391 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/data/256940d30/4054b6ab05b344af954fae6fb05d9757 [2023-11-19 05:24:51,394 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:24:51,395 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:24:51,397 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:24:51,397 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:24:51,408 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:24:51,412 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,413 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7df0705c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51, skipping insertion in model container [2023-11-19 05:24:51,414 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,443 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:24:51,731 WARN L240 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_834e6c9d-5829-402b-afc4-9f326fb75400/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_valuebound10.c[524,537] [2023-11-19 05:24:51,768 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:24:51,780 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:24:51,796 WARN L240 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_834e6c9d-5829-402b-afc4-9f326fb75400/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_valuebound10.c[524,537] [2023-11-19 05:24:51,824 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:24:51,846 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:24:51,847 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51 WrapperNode [2023-11-19 05:24:51,847 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:24:51,849 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:24:51,849 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:24:51,849 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:24:51,858 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,868 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,893 INFO L138 Inliner]: procedures = 14, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 44 [2023-11-19 05:24:51,894 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:24:51,894 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:24:51,895 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:24:51,895 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:24:51,905 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,906 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,917 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,918 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,921 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,924 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,926 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,927 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,935 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:24:51,936 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:24:51,936 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:24:51,937 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:24:51,938 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (1/1) ... [2023-11-19 05:24:51,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:24:51,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:51,974 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:24:52,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:24:52,022 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:24:52,023 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-19 05:24:52,023 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-19 05:24:52,023 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:24:52,023 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:24:52,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:24:52,025 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-19 05:24:52,026 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-19 05:24:52,093 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:24:52,095 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:24:52,242 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:24:52,300 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:24:52,300 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-19 05:24:52,305 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:24:52 BoogieIcfgContainer [2023-11-19 05:24:52,305 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:24:52,308 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:24:52,308 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:24:52,312 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:24:52,312 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:24:51" (1/3) ... [2023-11-19 05:24:52,313 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71efbe6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:24:52, skipping insertion in model container [2023-11-19 05:24:52,313 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:51" (2/3) ... [2023-11-19 05:24:52,314 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71efbe6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:24:52, skipping insertion in model container [2023-11-19 05:24:52,314 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:24:52" (3/3) ... [2023-11-19 05:24:52,315 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat2-ll_valuebound10.c [2023-11-19 05:24:52,336 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:24:52,337 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:24:52,396 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:24:52,403 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=LoopHeads, 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;@301343a3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:24:52,404 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:24:52,408 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 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) [2023-11-19 05:24:52,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:24:52,417 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:52,417 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:52,418 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:52,424 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:52,424 INFO L85 PathProgramCache]: Analyzing trace with hash 733771015, now seen corresponding path program 1 times [2023-11-19 05:24:52,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:52,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792169496] [2023-11-19 05:24:52,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:52,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:52,542 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:24:52,543 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1333648577] [2023-11-19 05:24:52,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:52,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:52,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:52,546 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:52,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:24:52,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:52,638 INFO L262 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-19 05:24:52,646 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:52,993 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:24:52,993 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:24:52,994 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:52,994 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792169496] [2023-11-19 05:24:52,995 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:24:52,995 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333648577] [2023-11-19 05:24:52,996 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333648577] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:52,996 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:52,997 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:24:52,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551627100] [2023-11-19 05:24:53,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:53,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:24:53,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:53,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:24:53,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:24:53,041 INFO L87 Difference]: Start difference. First operand has 21 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 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 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 05:24:53,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:53,147 INFO L93 Difference]: Finished difference Result 42 states and 59 transitions. [2023-11-19 05:24:53,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:24:53,150 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2023-11-19 05:24:53,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:53,160 INFO L225 Difference]: With dead ends: 42 [2023-11-19 05:24:53,160 INFO L226 Difference]: Without dead ends: 27 [2023-11-19 05:24:53,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:24:53,168 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:53,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 66 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:24:53,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-19 05:24:53,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2023-11-19 05:24:53,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 16 states have internal predecessors, (16), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-19 05:24:53,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2023-11-19 05:24:53,239 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2023-11-19 05:24:53,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:53,242 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2023-11-19 05:24:53,243 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-19 05:24:53,243 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2023-11-19 05:24:53,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 05:24:53,247 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:53,247 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:53,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:53,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-19 05:24:53,471 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:53,472 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:53,472 INFO L85 PathProgramCache]: Analyzing trace with hash -1679275353, now seen corresponding path program 1 times [2023-11-19 05:24:53,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:53,473 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298976766] [2023-11-19 05:24:53,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:53,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:53,500 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:24:53,505 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [28272533] [2023-11-19 05:24:53,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:53,508 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:53,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:53,510 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:53,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:24:53,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:53,617 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 05:24:53,621 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:53,808 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:24:53,809 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:24:54,009 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:24:54,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:54,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298976766] [2023-11-19 05:24:54,010 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:24:54,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28272533] [2023-11-19 05:24:54,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28272533] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:24:54,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1317193782] [2023-11-19 05:24:54,032 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-19 05:24:54,032 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:24:54,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:24:54,042 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:24:54,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:24:55,130 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 63 for LOIs [2023-11-19 05:24:55,275 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-19 05:24:55,277 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:24:58,020 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1317193782] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:58,020 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:24:58,021 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [8, 8] total 22 [2023-11-19 05:24:58,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979598414] [2023-11-19 05:24:58,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:58,022 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 05:24:58,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:58,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 05:24:58,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:24:58,028 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 14 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 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) [2023-11-19 05:25:01,462 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.89s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2023-11-19 05:25:01,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:01,521 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2023-11-19 05:25:01,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 05:25:01,522 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 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) Word has length 26 [2023-11-19 05:25:01,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:01,523 INFO L225 Difference]: With dead ends: 33 [2023-11-19 05:25:01,523 INFO L226 Difference]: Without dead ends: 26 [2023-11-19 05:25:01,524 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:25:01,527 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 13 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:01,530 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 33 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2023-11-19 05:25:01,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-19 05:25:01,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-19 05:25:01,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-19 05:25:01,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2023-11-19 05:25:01,555 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 26 [2023-11-19 05:25:01,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:01,556 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2023-11-19 05:25:01,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 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) [2023-11-19 05:25:01,558 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2023-11-19 05:25:01,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-19 05:25:01,560 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:01,566 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:01,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:01,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:01,781 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:01,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:01,781 INFO L85 PathProgramCache]: Analyzing trace with hash 1039691150, now seen corresponding path program 1 times [2023-11-19 05:25:01,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:01,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672859083] [2023-11-19 05:25:01,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:01,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:01,814 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:25:01,815 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [132239383] [2023-11-19 05:25:01,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:01,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:01,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:01,817 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:01,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:25:01,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:01,883 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-19 05:25:01,887 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:03,378 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:25:03,378 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:25:03,953 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:25:03,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:03,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672859083] [2023-11-19 05:25:03,954 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:25:03,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132239383] [2023-11-19 05:25:03,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132239383] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:25:03,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [686881860] [2023-11-19 05:25:03,958 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-19 05:25:03,958 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:25:03,960 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:25:03,960 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:25:03,960 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:25:04,908 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-11-19 05:25:04,946 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-19 05:25:04,948 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:25:11,449 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '610#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_18| Int) (|v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_41| Int)) (and (not (= (+ (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_19| 2) (* |v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_19|)) (+ (* |v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_18| 4) (* |v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_41| 4) (* 2 |v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_19|) (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_19|)))) (<= |v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_41| 10) (<= 0 |v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_41|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-19 05:25:11,450 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:25:11,450 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:25:11,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 13 [2023-11-19 05:25:11,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415267943] [2023-11-19 05:25:11,451 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:25:11,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 05:25:11,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:11,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 05:25:11,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=635, Unknown=1, NotChecked=0, Total=756 [2023-11-19 05:25:11,454 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 13 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 6 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2023-11-19 05:25:13,898 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.35s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-19 05:25:13,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:13,900 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2023-11-19 05:25:13,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 05:25:13,903 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 6 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) Word has length 27 [2023-11-19 05:25:13,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:13,904 INFO L225 Difference]: With dead ends: 36 [2023-11-19 05:25:13,904 INFO L226 Difference]: Without dead ends: 32 [2023-11-19 05:25:13,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=154, Invalid=901, Unknown=1, NotChecked=0, Total=1056 [2023-11-19 05:25:13,907 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:13,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 105 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-11-19 05:25:13,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-19 05:25:13,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2023-11-19 05:25:13,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 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) [2023-11-19 05:25:13,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2023-11-19 05:25:13,952 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 27 [2023-11-19 05:25:13,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:13,953 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2023-11-19 05:25:13,954 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 6 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2023-11-19 05:25:13,954 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2023-11-19 05:25:13,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-19 05:25:13,960 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:25:13,961 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:25:13,989 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-19 05:25:14,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:14,181 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:25:14,182 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:25:14,182 INFO L85 PathProgramCache]: Analyzing trace with hash -994868754, now seen corresponding path program 1 times [2023-11-19 05:25:14,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:25:14,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574100383] [2023-11-19 05:25:14,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:14,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:25:14,203 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:25:14,214 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [121204256] [2023-11-19 05:25:14,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:25:14,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:14,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:25:14,217 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:25:14,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:25:14,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:25:14,318 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 05:25:14,323 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:25:14,409 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:25:14,410 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:25:14,546 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:25:14,547 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:25:14,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574100383] [2023-11-19 05:25:14,547 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:25:14,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121204256] [2023-11-19 05:25:14,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [121204256] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:25:14,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1235159495] [2023-11-19 05:25:14,551 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-19 05:25:14,551 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:25:14,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:25:14,552 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:25:14,552 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:25:15,745 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-11-19 05:25:15,751 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-19 05:25:15,753 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:25:42,686 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '933#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-19 05:25:42,686 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:25:42,687 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:25:42,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2023-11-19 05:25:42,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369279891] [2023-11-19 05:25:42,687 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:25:42,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-19 05:25:42,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:25:42,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-19 05:25:42,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=379, Unknown=9, NotChecked=0, Total=462 [2023-11-19 05:25:42,691 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 3 states have call predecessors, (7), 1 states have call successors, (7) [2023-11-19 05:25:44,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:25:44,958 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2023-11-19 05:25:44,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:25:44,966 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 3 states have call predecessors, (7), 1 states have call successors, (7) Word has length 33 [2023-11-19 05:25:44,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:25:44,967 INFO L225 Difference]: With dead ends: 28 [2023-11-19 05:25:44,967 INFO L226 Difference]: Without dead ends: 0 [2023-11-19 05:25:44,968 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 29.1s TimeCoverageRelationStatistics Valid=88, Invalid=454, Unknown=10, NotChecked=0, Total=552 [2023-11-19 05:25:44,969 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 10 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:25:44,970 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 73 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:25:44,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2023-11-19 05:25:44,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2023-11-19 05:25:44,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:25:44,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2023-11-19 05:25:44,975 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 33 [2023-11-19 05:25:44,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:25:44,975 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2023-11-19 05:25:44,975 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (7), 3 states have call predecessors, (7), 1 states have call successors, (7) [2023-11-19 05:25:44,976 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2023-11-19 05:25:44,976 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2023-11-19 05:25:44,979 INFO L805 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-11-19 05:25:45,014 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:25:45,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_834e6c9d-5829-402b-afc4-9f326fb75400/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:25:45,203 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.