./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_valuebound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/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_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/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_4a95e677-c1fa-463b-8075-2444f9e671e6/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 83a507b5a78977c4a0b48a152de77bd7eabcfca9b19b757436d28082e86741ee --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:31:51,475 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:31:51,601 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:31:51,608 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:31:51,609 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:31:51,650 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:31:51,651 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:31:51,652 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:31:51,653 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:31:51,658 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:31:51,659 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:31:51,660 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:31:51,660 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:31:51,662 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:31:51,662 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:31:51,663 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:31:51,663 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:31:51,664 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:31:51,664 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:31:51,665 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:31:51,665 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:31:51,666 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:31:51,667 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:31:51,667 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:31:51,668 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:31:51,668 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:31:51,669 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:31:51,669 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:31:51,670 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:31:51,670 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:31:51,671 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:31:51,672 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:31:51,672 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:31:51,672 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:31:51,673 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:31:51,673 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:31:51,673 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:31:51,673 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:31:51,674 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:31:51,674 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:31:51,674 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:31:51,675 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:31:51,675 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:31:51,675 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:31:51,676 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:31:51,676 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:31:51,677 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:31:51,677 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_4a95e677-c1fa-463b-8075-2444f9e671e6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 83a507b5a78977c4a0b48a152de77bd7eabcfca9b19b757436d28082e86741ee [2023-11-23 20:31:51,993 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:31:52,027 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:31:52,030 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:31:52,033 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:31:52,033 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:31:52,035 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/nla-digbench-scaling/hard-u_valuebound20.c [2023-11-23 20:31:55,184 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:31:55,416 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:31:55,417 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/sv-benchmarks/c/nla-digbench-scaling/hard-u_valuebound20.c [2023-11-23 20:31:55,425 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/data/d15ea6d07/a05b8a43d0cd471e96f078ff2d425d61/FLAG3c874ff28 [2023-11-23 20:31:55,442 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/data/d15ea6d07/a05b8a43d0cd471e96f078ff2d425d61 [2023-11-23 20:31:55,444 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:31:55,446 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:31:55,447 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:31:55,447 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:31:55,452 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:31:55,453 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,454 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cc5a398 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55, skipping insertion in model container [2023-11-23 20:31:55,454 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,490 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:31:55,719 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_4a95e677-c1fa-463b-8075-2444f9e671e6/sv-benchmarks/c/nla-digbench-scaling/hard-u_valuebound20.c[537,550] [2023-11-23 20:31:55,752 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:31:55,767 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:31:55,782 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_4a95e677-c1fa-463b-8075-2444f9e671e6/sv-benchmarks/c/nla-digbench-scaling/hard-u_valuebound20.c[537,550] [2023-11-23 20:31:55,808 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:31:55,827 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:31:55,828 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55 WrapperNode [2023-11-23 20:31:55,828 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:31:55,829 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:31:55,829 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:31:55,830 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:31:55,839 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,849 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,882 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 56 [2023-11-23 20:31:55,882 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:31:55,883 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:31:55,883 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:31:55,883 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:31:55,895 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,896 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,908 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,908 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,915 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,919 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,920 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,921 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,923 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:31:55,924 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:31:55,924 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:31:55,924 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:31:55,925 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (1/1) ... [2023-11-23 20:31:55,938 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:31:55,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:31:55,972 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:31:55,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:31:56,015 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:31:56,016 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-23 20:31:56,016 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-23 20:31:56,016 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:31:56,017 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:31:56,017 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:31:56,017 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-23 20:31:56,017 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-23 20:31:56,087 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:31:56,090 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:31:56,276 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:31:56,330 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:31:56,330 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-23 20:31:56,332 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:31:56 BoogieIcfgContainer [2023-11-23 20:31:56,332 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:31:56,335 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:31:56,336 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:31:56,340 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:31:56,340 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:31:55" (1/3) ... [2023-11-23 20:31:56,341 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4363569a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:31:56, skipping insertion in model container [2023-11-23 20:31:56,341 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:55" (2/3) ... [2023-11-23 20:31:56,342 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4363569a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:31:56, skipping insertion in model container [2023-11-23 20:31:56,342 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:31:56" (3/3) ... [2023-11-23 20:31:56,344 INFO L112 eAbstractionObserver]: Analyzing ICFG hard-u_valuebound20.c [2023-11-23 20:31:56,368 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:31:56,368 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 20:31:56,425 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:31:56,433 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;@16677cf4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:31:56,434 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 20:31:56,439 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-23 20:31:56,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 20:31:56,449 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:31:56,450 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:31:56,451 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:31:56,457 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:31:56,458 INFO L85 PathProgramCache]: Analyzing trace with hash 763440750, now seen corresponding path program 1 times [2023-11-23 20:31:56,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:31:56,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376198013] [2023-11-23 20:31:56,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:31:56,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:31:56,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:31:56,970 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:31:56,971 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:31:56,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376198013] [2023-11-23 20:31:56,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376198013] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:31:56,972 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:31:56,973 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:31:56,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230937257] [2023-11-23 20:31:56,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:31:56,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:31:56,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:31:57,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:31:57,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:31:57,035 INFO L87 Difference]: Start difference. First operand has 27 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 20:31:57,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:31:57,148 INFO L93 Difference]: Finished difference Result 57 states and 96 transitions. [2023-11-23 20:31:57,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:31:57,151 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 17 [2023-11-23 20:31:57,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:31:57,160 INFO L225 Difference]: With dead ends: 57 [2023-11-23 20:31:57,160 INFO L226 Difference]: Without dead ends: 35 [2023-11-23 20:31:57,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:31:57,168 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 10 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:31:57,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 102 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:31:57,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-23 20:31:57,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2023-11-23 20:31:57,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-23 20:31:57,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2023-11-23 20:31:57,229 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 17 [2023-11-23 20:31:57,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:31:57,230 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2023-11-23 20:31:57,230 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 20:31:57,231 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2023-11-23 20:31:57,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 20:31:57,232 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:31:57,233 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:31:57,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:31:57,233 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:31:57,234 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:31:57,234 INFO L85 PathProgramCache]: Analyzing trace with hash 1804559349, now seen corresponding path program 1 times [2023-11-23 20:31:57,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:31:57,235 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [218330140] [2023-11-23 20:31:57,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:31:57,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:31:57,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:31:57,694 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:31:57,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:31:57,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [218330140] [2023-11-23 20:31:57,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [218330140] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:31:57,695 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:31:57,695 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:31:57,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727161889] [2023-11-23 20:31:57,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:31:57,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:31:57,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:31:57,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:31:57,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:31:57,701 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 20:31:57,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:31:57,826 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2023-11-23 20:31:57,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:31:57,843 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 22 [2023-11-23 20:31:57,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:31:57,845 INFO L225 Difference]: With dead ends: 41 [2023-11-23 20:31:57,845 INFO L226 Difference]: Without dead ends: 39 [2023-11-23 20:31:57,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:31:57,847 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 8 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:31:57,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 98 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:31:57,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-11-23 20:31:57,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2023-11-23 20:31:57,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-23 20:31:57,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2023-11-23 20:31:57,868 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 22 [2023-11-23 20:31:57,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:31:57,869 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2023-11-23 20:31:57,869 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 20:31:57,870 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2023-11-23 20:31:57,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 20:31:57,871 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:31:57,871 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:31:57,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:31:57,872 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:31:57,872 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:31:57,872 INFO L85 PathProgramCache]: Analyzing trace with hash 496345742, now seen corresponding path program 1 times [2023-11-23 20:31:57,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:31:57,873 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3195875] [2023-11-23 20:31:57,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:31:57,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:31:57,890 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:31:57,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [746053514] [2023-11-23 20:31:57,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:31:57,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:31:57,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:31:57,900 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:31:57,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:31:57,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:31:57,990 INFO L262 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 20:31:57,998 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:31:58,264 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 20:31:58,265 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:31:58,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:31:58,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3195875] [2023-11-23 20:31:58,265 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 20:31:58,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746053514] [2023-11-23 20:31:58,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746053514] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:31:58,274 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:31:58,275 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-23 20:31:58,275 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213688856] [2023-11-23 20:31:58,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:31:58,277 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 20:31:58,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:31:58,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 20:31:58,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:31:58,281 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 8 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-23 20:31:58,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:31:58,487 INFO L93 Difference]: Finished difference Result 60 states and 78 transitions. [2023-11-23 20:31:58,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:31:58,488 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 27 [2023-11-23 20:31:58,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:31:58,492 INFO L225 Difference]: With dead ends: 60 [2023-11-23 20:31:58,492 INFO L226 Difference]: Without dead ends: 47 [2023-11-23 20:31:58,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2023-11-23 20:31:58,496 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 18 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:31:58,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 110 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:31:58,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-23 20:31:58,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-11-23 20:31:58,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-11-23 20:31:58,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 59 transitions. [2023-11-23 20:31:58,537 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 59 transitions. Word has length 27 [2023-11-23 20:31:58,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:31:58,538 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 59 transitions. [2023-11-23 20:31:58,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-23 20:31:58,538 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 59 transitions. [2023-11-23 20:31:58,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-23 20:31:58,540 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:31:58,540 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:31:58,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:31:58,760 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-23 20:31:58,760 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:31:58,761 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:31:58,761 INFO L85 PathProgramCache]: Analyzing trace with hash -1046956766, now seen corresponding path program 1 times [2023-11-23 20:31:58,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:31:58,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516026161] [2023-11-23 20:31:58,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:31:58,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:31:58,774 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:31:58,774 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1136844824] [2023-11-23 20:31:58,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:31:58,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:31:58,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:31:58,777 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:31:58,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:31:58,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:31:58,843 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-23 20:31:58,847 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:31:59,147 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 20:31:59,147 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:31:59,887 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 20:31:59,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:31:59,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516026161] [2023-11-23 20:31:59,887 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 20:31:59,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136844824] [2023-11-23 20:31:59,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1136844824] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:31:59,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2003694296] [2023-11-23 20:31:59,909 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-23 20:31:59,910 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:31:59,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:31:59,919 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:31:59,920 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:32:00,696 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-23 20:32:00,702 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-23 20:32:00,704 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:32:01,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2003694296] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:32:01,461 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:32:01,461 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [11, 10] total 26 [2023-11-23 20:32:01,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629246724] [2023-11-23 20:32:01,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:32:01,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-23 20:32:01,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:32:01,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-23 20:32:01,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=527, Unknown=0, NotChecked=0, Total=650 [2023-11-23 20:32:01,464 INFO L87 Difference]: Start difference. First operand 47 states and 59 transitions. Second operand has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 20:32:01,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:32:01,905 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2023-11-23 20:32:01,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 20:32:01,907 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 34 [2023-11-23 20:32:01,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:32:01,909 INFO L225 Difference]: With dead ends: 61 [2023-11-23 20:32:01,909 INFO L226 Difference]: Without dead ends: 50 [2023-11-23 20:32:01,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 72 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=149, Invalid=663, Unknown=0, NotChecked=0, Total=812 [2023-11-23 20:32:01,911 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 20 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:32:01,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 41 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 20:32:01,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-23 20:32:01,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-23 20:32:01,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 29 states have (on average 1.103448275862069) internal successors, (32), 30 states have internal predecessors, (32), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-23 20:32:01,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2023-11-23 20:32:01,931 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 34 [2023-11-23 20:32:01,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:32:01,932 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2023-11-23 20:32:01,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 20:32:01,932 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2023-11-23 20:32:01,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-23 20:32:01,934 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:32:01,934 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:32:01,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:32:02,150 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-11-23 20:32:02,151 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:32:02,151 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:32:02,151 INFO L85 PathProgramCache]: Analyzing trace with hash -202147981, now seen corresponding path program 1 times [2023-11-23 20:32:02,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:32:02,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901336686] [2023-11-23 20:32:02,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:32:02,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:32:02,167 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:32:02,167 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [90270646] [2023-11-23 20:32:02,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:32:02,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:32:02,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:32:02,169 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:32:02,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:32:02,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:32:02,289 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-23 20:32:02,292 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:32:02,671 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 24 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-23 20:32:02,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:32:03,093 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 27 proven. 5 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-23 20:32:03,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:32:03,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901336686] [2023-11-23 20:32:03,094 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 20:32:03,094 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90270646] [2023-11-23 20:32:03,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90270646] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:32:03,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1608662860] [2023-11-23 20:32:03,102 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-23 20:32:03,103 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:32:03,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:32:03,104 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:32:03,104 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:32:05,318 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2023-11-23 20:32:05,324 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-23 20:32:05,325 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:32:06,214 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1204#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 20:32:06,214 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:32:06,214 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:32:06,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 16 [2023-11-23 20:32:06,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922781821] [2023-11-23 20:32:06,215 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:32:06,215 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-23 20:32:06,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:32:06,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-23 20:32:06,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2023-11-23 20:32:06,217 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 16 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 11 states have internal predecessors, (24), 7 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (16), 9 states have call predecessors, (16), 5 states have call successors, (16) [2023-11-23 20:32:08,366 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-23 20:32:10,606 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-23 20:32:12,609 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-23 20:32:14,613 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-23 20:32:14,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:32:14,789 INFO L93 Difference]: Finished difference Result 74 states and 90 transitions. [2023-11-23 20:32:14,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 20:32:14,790 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 11 states have internal predecessors, (24), 7 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (16), 9 states have call predecessors, (16), 5 states have call successors, (16) Word has length 44 [2023-11-23 20:32:14,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:32:14,793 INFO L225 Difference]: With dead ends: 74 [2023-11-23 20:32:14,793 INFO L226 Difference]: Without dead ends: 66 [2023-11-23 20:32:14,795 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=144, Invalid=848, Unknown=0, NotChecked=0, Total=992 [2023-11-23 20:32:14,796 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 43 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 45 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:32:14,796 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 166 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 268 Invalid, 3 Unknown, 0 Unchecked, 8.4s Time] [2023-11-23 20:32:14,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-23 20:32:14,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2023-11-23 20:32:14,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 39 states have internal predecessors, (41), 20 states have call successors, (20), 8 states have call predecessors, (20), 8 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2023-11-23 20:32:14,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 80 transitions. [2023-11-23 20:32:14,828 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 80 transitions. Word has length 44 [2023-11-23 20:32:14,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:32:14,829 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 80 transitions. [2023-11-23 20:32:14,829 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 11 states have internal predecessors, (24), 7 states have call successors, (17), 2 states have call predecessors, (17), 3 states have return successors, (16), 9 states have call predecessors, (16), 5 states have call successors, (16) [2023-11-23 20:32:14,829 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 80 transitions. [2023-11-23 20:32:14,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-11-23 20:32:14,831 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:32:14,831 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:32:14,838 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-23 20:32:15,037 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:32:15,038 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:32:15,038 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:32:15,039 INFO L85 PathProgramCache]: Analyzing trace with hash -567180131, now seen corresponding path program 1 times [2023-11-23 20:32:15,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:32:15,039 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129369307] [2023-11-23 20:32:15,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:32:15,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:32:15,060 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:32:15,068 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1424316962] [2023-11-23 20:32:15,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:32:15,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:32:15,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:32:15,070 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:32:15,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:32:15,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:32:15,183 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 20:32:15,186 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:32:15,357 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 23 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-23 20:32:15,357 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:32:15,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:32:15,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129369307] [2023-11-23 20:32:15,444 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 20:32:15,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424316962] [2023-11-23 20:32:15,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1424316962] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:32:15,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [532018742] [2023-11-23 20:32:15,449 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-23 20:32:15,449 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:32:15,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:32:15,450 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:32:15,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:32:17,342 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-11-23 20:32:17,370 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-11-23 20:32:17,371 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:32:18,169 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1618#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 20:32:18,170 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:32:18,170 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:32:18,170 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2023-11-23 20:32:18,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694585591] [2023-11-23 20:32:18,170 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-23 20:32:18,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 20:32:18,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:32:18,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 20:32:18,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2023-11-23 20:32:18,172 INFO L87 Difference]: Start difference. First operand 66 states and 80 transitions. Second operand has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-23 20:32:18,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:32:18,387 INFO L93 Difference]: Finished difference Result 78 states and 95 transitions. [2023-11-23 20:32:18,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:32:18,388 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 51 [2023-11-23 20:32:18,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:32:18,390 INFO L225 Difference]: With dead ends: 78 [2023-11-23 20:32:18,390 INFO L226 Difference]: Without dead ends: 76 [2023-11-23 20:32:18,391 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=94, Invalid=506, Unknown=0, NotChecked=0, Total=600 [2023-11-23 20:32:18,392 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 17 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:32:18,392 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 89 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:32:18,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-23 20:32:18,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2023-11-23 20:32:18,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 42 states have (on average 1.119047619047619) internal successors, (47), 45 states have internal predecessors, (47), 23 states have call successors, (23), 9 states have call predecessors, (23), 9 states have return successors, (22), 20 states have call predecessors, (22), 22 states have call successors, (22) [2023-11-23 20:32:18,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 92 transitions. [2023-11-23 20:32:18,425 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 92 transitions. Word has length 51 [2023-11-23 20:32:18,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:32:18,425 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 92 transitions. [2023-11-23 20:32:18,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-23 20:32:18,426 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 92 transitions. [2023-11-23 20:32:18,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-11-23 20:32:18,427 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:32:18,428 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:32:18,444 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-23 20:32:18,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 20:32:18,635 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:32:18,636 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:32:18,636 INFO L85 PathProgramCache]: Analyzing trace with hash 166119996, now seen corresponding path program 1 times [2023-11-23 20:32:18,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:32:18,636 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716101419] [2023-11-23 20:32:18,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:32:18,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:32:18,670 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:32:18,670 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1827933554] [2023-11-23 20:32:18,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:32:18,671 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:32:18,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:32:18,685 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:32:18,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4a95e677-c1fa-463b-8075-2444f9e671e6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:32:19,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:32:19,157 INFO L262 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 48 conjunts are in the unsatisfiable core [2023-11-23 20:32:19,161 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:32:20,100 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2023-11-23 20:32:20,101 INFO L327 TraceCheckSpWp]: Computing backward predicates...