./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire --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 27783f29349ebae8401558a8bc17fafd87092d54a86e2af0abb3d67f703ff6c0 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:17:47,099 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:17:47,190 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:17:47,198 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:17:47,199 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:17:47,234 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:17:47,235 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:17:47,237 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:17:47,238 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:17:47,240 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:17:47,241 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:17:47,243 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:17:47,243 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:17:47,250 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:17:47,251 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:17:47,251 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:17:47,253 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:17:47,254 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:17:47,255 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:17:47,255 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:17:47,256 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:17:47,257 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:17:47,258 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:17:47,259 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:17:47,260 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:17:47,260 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:17:47,261 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:17:47,262 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:17:47,262 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:17:47,263 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:17:47,265 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:17:47,265 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:17:47,266 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:17:47,266 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:17:47,266 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:17:47,267 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:17:47,267 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:17:47,267 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:17:47,268 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:17:47,268 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:17:47,269 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:17:47,270 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:17:47,270 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:17:47,271 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:17:47,272 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:17:47,272 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:17:47,272 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:17:47,273 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_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 27783f29349ebae8401558a8bc17fafd87092d54a86e2af0abb3d67f703ff6c0 [2023-11-23 21:17:47,610 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:17:47,654 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:17:47,658 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:17:47,661 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:17:47,661 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:17:47,663 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c [2023-11-23 21:17:51,077 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:17:51,360 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:17:51,362 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c [2023-11-23 21:17:51,375 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/data/e3360113d/e7a79e70d533411c9f99146d2c925073/FLAG8d1d261eb [2023-11-23 21:17:51,397 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/data/e3360113d/e7a79e70d533411c9f99146d2c925073 [2023-11-23 21:17:51,404 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:17:51,407 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:17:51,411 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:17:51,411 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:17:51,418 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:17:51,421 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,423 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1cf572d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51, skipping insertion in model container [2023-11-23 21:17:51,423 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,463 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:17:51,665 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_49b8611d-a0e7-4ccd-92f1-8396cd088e65/sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c[1080,1093] [2023-11-23 21:17:51,696 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:17:51,711 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:17:51,724 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_49b8611d-a0e7-4ccd-92f1-8396cd088e65/sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c[1080,1093] [2023-11-23 21:17:51,744 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:17:51,764 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:17:51,764 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51 WrapperNode [2023-11-23 21:17:51,764 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:17:51,766 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:17:51,766 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:17:51,766 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:17:51,777 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,788 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,815 INFO L138 Inliner]: procedures = 17, calls = 84, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 77 [2023-11-23 21:17:51,816 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:17:51,817 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:17:51,817 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:17:51,817 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:17:51,829 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,830 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,834 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,835 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,846 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,849 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,852 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,854 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,858 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:17:51,860 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:17:51,860 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:17:51,860 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:17:51,861 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (1/1) ... [2023-11-23 21:17:51,869 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:17:51,888 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:51,905 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:17:51,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:17:51,957 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:17:51,957 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:17:51,958 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_41_to_51_0 [2023-11-23 21:17:51,958 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_41_to_51_0 [2023-11-23 21:17:51,958 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:17:51,958 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_31_to_38_0 [2023-11-23 21:17:51,958 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_31_to_38_0 [2023-11-23 21:17:51,959 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:17:51,959 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:17:51,959 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:17:51,959 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:17:51,959 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-23 21:17:51,960 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-23 21:17:51,960 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:17:52,080 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:17:52,084 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:17:52,470 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:17:52,645 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:17:52,645 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-23 21:17:52,652 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:17:52 BoogieIcfgContainer [2023-11-23 21:17:52,652 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:17:52,660 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:17:52,661 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:17:52,665 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:17:52,665 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:17:51" (1/3) ... [2023-11-23 21:17:52,666 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@322c7e63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:17:52, skipping insertion in model container [2023-11-23 21:17:52,667 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:17:51" (2/3) ... [2023-11-23 21:17:52,668 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@322c7e63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:17:52, skipping insertion in model container [2023-11-23 21:17:52,668 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:17:52" (3/3) ... [2023-11-23 21:17:52,670 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_hard-u.c [2023-11-23 21:17:52,693 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:17:52,693 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:17:52,757 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:17:52,765 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;@43973e17, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:17:52,766 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:17:52,771 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 24 states have internal predecessors, (27), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-23 21:17:52,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:17:52,779 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:52,779 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:17:52,780 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:52,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:52,785 INFO L85 PathProgramCache]: Analyzing trace with hash -446774543, now seen corresponding path program 1 times [2023-11-23 21:17:52,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:52,795 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1668195815] [2023-11-23 21:17:52,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:52,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:52,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:53,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:17:53,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:53,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1668195815] [2023-11-23 21:17:53,820 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1668195815] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:53,820 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:17:53,820 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-23 21:17:53,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912584412] [2023-11-23 21:17:53,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:53,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:17:53,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:53,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:17:53,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:17:53,866 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 24 states have internal predecessors, (27), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:17:54,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:54,240 INFO L93 Difference]: Finished difference Result 81 states and 119 transitions. [2023-11-23 21:17:54,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:17:54,243 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-23 21:17:54,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:54,253 INFO L225 Difference]: With dead ends: 81 [2023-11-23 21:17:54,253 INFO L226 Difference]: Without dead ends: 44 [2023-11-23 21:17:54,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-23 21:17:54,262 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 20 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:54,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 171 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:17:54,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-23 21:17:54,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 39. [2023-11-23 21:17:54,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 26 states have internal predecessors, (26), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-23 21:17:54,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2023-11-23 21:17:54,315 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 8 [2023-11-23 21:17:54,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:54,316 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2023-11-23 21:17:54,317 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:17:54,317 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2023-11-23 21:17:54,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:17:54,318 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:54,318 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:17:54,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:17:54,319 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:54,320 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:54,320 INFO L85 PathProgramCache]: Analyzing trace with hash -1156065846, now seen corresponding path program 1 times [2023-11-23 21:17:54,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:54,320 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069206861] [2023-11-23 21:17:54,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:54,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:54,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:55,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:17:55,648 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:55,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069206861] [2023-11-23 21:17:55,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069206861] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:55,650 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:17:55,650 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-23 21:17:55,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538010542] [2023-11-23 21:17:55,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:55,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:17:55,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:55,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:17:55,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:17:55,655 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:17:55,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:55,972 INFO L93 Difference]: Finished difference Result 57 states and 69 transitions. [2023-11-23 21:17:55,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:17:55,973 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-11-23 21:17:55,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:55,975 INFO L225 Difference]: With dead ends: 57 [2023-11-23 21:17:55,975 INFO L226 Difference]: Without dead ends: 55 [2023-11-23 21:17:55,976 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-23 21:17:55,978 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 16 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:55,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 200 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:17:55,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-11-23 21:17:55,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2023-11-23 21:17:55,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 33 states have (on average 1.121212121212121) internal successors, (37), 36 states have internal predecessors, (37), 14 states have call successors, (14), 6 states have call predecessors, (14), 6 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2023-11-23 21:17:55,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2023-11-23 21:17:55,997 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 14 [2023-11-23 21:17:55,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:55,997 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2023-11-23 21:17:55,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:17:55,998 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2023-11-23 21:17:55,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:17:55,999 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:55,999 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:17:56,000 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:17:56,000 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:56,001 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:56,001 INFO L85 PathProgramCache]: Analyzing trace with hash -1393923359, now seen corresponding path program 1 times [2023-11-23 21:17:56,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:56,002 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049523691] [2023-11-23 21:17:56,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:56,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:56,045 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:17:56,046 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [692300921] [2023-11-23 21:17:56,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:56,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:56,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:56,055 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:56,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:17:56,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:56,400 INFO L262 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 71 conjunts are in the unsatisfiable core [2023-11-23 21:17:56,412 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:56,618 INFO L349 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2023-11-23 21:17:56,621 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 202 treesize of output 81 [2023-11-23 21:17:56,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:17:56,830 INFO L349 Elim1Store]: treesize reduction 76, result has 31.5 percent of original size [2023-11-23 21:17:56,831 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 10 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 47 treesize of output 76 [2023-11-23 21:17:56,924 INFO L349 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2023-11-23 21:17:56,925 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 165 treesize of output 157 [2023-11-23 21:17:57,219 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2023-11-23 21:17:57,398 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-23 21:17:58,333 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 13 [2023-11-23 21:17:58,400 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:17:58,401 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:17:59,193 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:17:59,193 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:59,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049523691] [2023-11-23 21:17:59,194 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:17:59,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692300921] [2023-11-23 21:17:59,194 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [692300921] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:59,194 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:59,195 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10] total 17 [2023-11-23 21:17:59,195 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759504416] [2023-11-23 21:17:59,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:59,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:17:59,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:59,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:17:59,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:17:59,197 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:18:03,140 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2023-11-23 21:18:04,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:04,493 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2023-11-23 21:18:04,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:18:04,495 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2023-11-23 21:18:04,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:04,497 INFO L225 Difference]: With dead ends: 61 [2023-11-23 21:18:04,497 INFO L226 Difference]: Without dead ends: 59 [2023-11-23 21:18:04,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2023-11-23 21:18:04,500 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 15 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:04,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 200 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 119 Invalid, 1 Unknown, 0 Unchecked, 3.5s Time] [2023-11-23 21:18:04,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-23 21:18:04,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2023-11-23 21:18:04,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 39 states have internal predecessors, (40), 14 states have call successors, (14), 7 states have call predecessors, (14), 7 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2023-11-23 21:18:04,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2023-11-23 21:18:04,529 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 20 [2023-11-23 21:18:04,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:04,530 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2023-11-23 21:18:04,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:18:04,530 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2023-11-23 21:18:04,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-23 21:18:04,533 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:04,534 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:04,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:04,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:04,745 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:04,745 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:04,746 INFO L85 PathProgramCache]: Analyzing trace with hash -885012426, now seen corresponding path program 1 times [2023-11-23 21:18:04,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:04,746 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860921689] [2023-11-23 21:18:04,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:04,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:04,797 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:18:04,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2051168377] [2023-11-23 21:18:04,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:04,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:04,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:04,799 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:04,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:18:05,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:05,043 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 92 conjunts are in the unsatisfiable core [2023-11-23 21:18:05,053 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:05,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,106 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 257 treesize of output 46 [2023-11-23 21:18:05,194 INFO L349 Elim1Store]: treesize reduction 74, result has 8.6 percent of original size [2023-11-23 21:18:05,194 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 494 treesize of output 488 [2023-11-23 21:18:05,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:05,351 INFO L349 Elim1Store]: treesize reduction 26, result has 44.7 percent of original size [2023-11-23 21:18:05,351 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 2 case distinctions, treesize of input 37 treesize of output 63 [2023-11-23 21:18:06,228 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-11-23 21:18:06,260 INFO L349 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2023-11-23 21:18:06,261 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 31 [2023-11-23 21:18:06,618 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 13 [2023-11-23 21:18:06,684 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:18:06,684 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:07,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:07,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860921689] [2023-11-23 21:18:07,608 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:18:07,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051168377] [2023-11-23 21:18:07,608 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051168377] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:07,609 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1118419208] [2023-11-23 21:18:07,639 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-23 21:18:07,640 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:07,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:07,653 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:07,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:08,874 INFO L197 IcfgInterpreter]: Interpreting procedure func_to_recursive_line_41_to_51_0 with input of size 129 for LOIs [2023-11-23 21:18:09,247 INFO L197 IcfgInterpreter]: Interpreting procedure func_to_recursive_line_31_to_38_0 with input of size 135 for LOIs [2023-11-23 21:18:11,811 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-11-23 21:18:11,818 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:41,143 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '818#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 21:18:41,143 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:41,144 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:18:41,144 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2023-11-23 21:18:41,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106770928] [2023-11-23 21:18:41,145 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:41,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-23 21:18:41,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:41,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-23 21:18:41,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=986, Unknown=6, NotChecked=0, Total=1122 [2023-11-23 21:18:41,152 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 13 states, 10 states have (on average 1.9) internal successors, (19), 11 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:18:41,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:41,842 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2023-11-23 21:18:41,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 21:18:41,846 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.9) internal successors, (19), 11 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2023-11-23 21:18:41,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:41,847 INFO L225 Difference]: With dead ends: 82 [2023-11-23 21:18:41,848 INFO L226 Difference]: Without dead ends: 80 [2023-11-23 21:18:41,849 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 30.3s TimeCoverageRelationStatistics Valid=181, Invalid=1453, Unknown=6, NotChecked=0, Total=1640 [2023-11-23 21:18:41,850 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 42 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:41,851 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 107 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:18:41,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-23 21:18:41,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2023-11-23 21:18:41,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 50 states have internal predecessors, (52), 17 states have call successors, (17), 9 states have call predecessors, (17), 11 states have return successors, (21), 16 states have call predecessors, (21), 16 states have call successors, (21) [2023-11-23 21:18:41,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 90 transitions. [2023-11-23 21:18:41,868 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 90 transitions. Word has length 32 [2023-11-23 21:18:41,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:41,868 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 90 transitions. [2023-11-23 21:18:41,869 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.9) internal successors, (19), 11 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:18:41,869 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 90 transitions. [2023-11-23 21:18:41,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-23 21:18:41,870 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:41,870 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] [2023-11-23 21:18:41,897 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-23 21:18:42,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:42,087 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:42,088 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:42,088 INFO L85 PathProgramCache]: Analyzing trace with hash -481527494, now seen corresponding path program 1 times [2023-11-23 21:18:42,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:42,088 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102315136] [2023-11-23 21:18:42,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:42,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:42,120 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:18:42,129 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [277287669] [2023-11-23 21:18:42,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:42,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:42,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:42,130 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:42,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_49b8611d-a0e7-4ccd-92f1-8396cd088e65/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:18:42,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:42,288 INFO L262 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 89 conjunts are in the unsatisfiable core [2023-11-23 21:18:42,295 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:42,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:42,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:42,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:42,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:42,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:42,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:42,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:42,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:42,337 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 133 treesize of output 42 [2023-11-23 21:18:42,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:18:42,382 INFO L349 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2023-11-23 21:18:42,382 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 82 treesize of output 72 [2023-11-23 21:18:42,404 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 15 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35