./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 96b71e4fe20331af08d1b5394215c6ca1c246124118142d0900823a256b0e31d --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:21:59,227 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:21:59,354 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:21:59,363 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:21:59,364 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:21:59,407 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:21:59,408 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:21:59,408 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:21:59,410 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:21:59,415 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:21:59,415 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:21:59,416 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:21:59,416 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:21:59,418 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:21:59,418 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:21:59,419 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:21:59,419 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:21:59,420 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:21:59,420 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:21:59,421 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:21:59,421 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:21:59,422 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:21:59,423 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:21:59,424 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:21:59,426 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:21:59,426 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:21:59,427 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:21:59,427 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:21:59,427 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:21:59,428 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:21:59,429 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:21:59,429 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:21:59,430 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:21:59,430 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:21:59,430 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:21:59,431 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:21:59,431 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:21:59,431 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:21:59,431 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:21:59,432 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:21:59,432 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:21:59,432 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:21:59,433 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:21:59,433 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:21:59,434 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:21:59,434 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_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 96b71e4fe20331af08d1b5394215c6ca1c246124118142d0900823a256b0e31d [2023-11-19 05:21:59,770 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:21:59,801 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:21:59,804 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:21:59,805 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:21:59,807 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:21:59,809 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound10.c [2023-11-19 05:22:02,959 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:22:03,157 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:22:03,158 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound10.c [2023-11-19 05:22:03,166 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/data/fb3318e31/07d2a58616644adb9ce75edcfe4df77b/FLAG3c06057db [2023-11-19 05:22:03,182 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/data/fb3318e31/07d2a58616644adb9ce75edcfe4df77b [2023-11-19 05:22:03,184 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:22:03,186 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:22:03,187 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:22:03,188 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:22:03,193 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:22:03,194 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,196 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4dc7568e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03, skipping insertion in model container [2023-11-19 05:22:03,196 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,219 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:22:03,381 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_e150e086-8dd0-4b91-8215-0c93d58772c3/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound10.c[524,537] [2023-11-19 05:22:03,414 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:22:03,427 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:22:03,445 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_e150e086-8dd0-4b91-8215-0c93d58772c3/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound10.c[524,537] [2023-11-19 05:22:03,468 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:22:03,485 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:22:03,486 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03 WrapperNode [2023-11-19 05:22:03,486 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:22:03,487 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:22:03,488 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:22:03,488 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:22:03,496 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,505 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,530 INFO L138 Inliner]: procedures = 14, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 47 [2023-11-19 05:22:03,530 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:22:03,531 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:22:03,531 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:22:03,532 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:22:03,541 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,542 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,553 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,554 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,559 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,571 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,572 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,576 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,578 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:22:03,584 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:22:03,584 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:22:03,584 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:22:03,585 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (1/1) ... [2023-11-19 05:22:03,591 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:22:03,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:03,630 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:22:03,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:22:03,680 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:22:03,680 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-19 05:22:03,680 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-19 05:22:03,681 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:22:03,681 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:22:03,681 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:22:03,681 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-19 05:22:03,681 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-19 05:22:03,746 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:22:03,749 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:22:03,948 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:22:03,986 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:22:03,986 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-19 05:22:03,991 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:22:03 BoogieIcfgContainer [2023-11-19 05:22:03,991 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:22:03,994 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:22:03,999 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:22:04,003 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:22:04,004 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:22:03" (1/3) ... [2023-11-19 05:22:04,006 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56e46193 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:22:04, skipping insertion in model container [2023-11-19 05:22:04,006 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:03" (2/3) ... [2023-11-19 05:22:04,007 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56e46193 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:22:04, skipping insertion in model container [2023-11-19 05:22:04,008 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:22:03" (3/3) ... [2023-11-19 05:22:04,009 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat2-ll_unwindbound10.c [2023-11-19 05:22:04,031 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:22:04,032 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:22:04,081 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:22:04,088 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;@676cd621, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:22:04,088 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:22:04,093 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:22:04,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:22:04,100 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:04,101 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:04,101 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:22:04,106 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:04,106 INFO L85 PathProgramCache]: Analyzing trace with hash -1046920148, now seen corresponding path program 1 times [2023-11-19 05:22:04,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:04,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839691085] [2023-11-19 05:22:04,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:04,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:04,217 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:22:04,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [638100310] [2023-11-19 05:22:04,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:04,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:04,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:04,227 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:04,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:22:04,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:04,341 INFO L262 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-19 05:22:04,346 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:04,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:04,373 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:22:04,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:04,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839691085] [2023-11-19 05:22:04,374 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:22:04,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638100310] [2023-11-19 05:22:04,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638100310] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:04,376 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:22:04,376 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:22:04,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190915300] [2023-11-19 05:22:04,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:04,384 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 05:22:04,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:04,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 05:22:04,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:22:04,416 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:22:04,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:04,447 INFO L93 Difference]: Finished difference Result 32 states and 43 transitions. [2023-11-19 05:22:04,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 05:22:04,450 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2023-11-19 05:22:04,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:04,459 INFO L225 Difference]: With dead ends: 32 [2023-11-19 05:22:04,459 INFO L226 Difference]: Without dead ends: 17 [2023-11-19 05:22:04,462 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:22:04,467 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:04,484 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:22:04,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-19 05:22:04,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-19 05:22:04,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:22:04,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2023-11-19 05:22:04,522 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 13 [2023-11-19 05:22:04,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:04,524 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2023-11-19 05:22:04,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:22:04,525 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2023-11-19 05:22:04,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 05:22:04,527 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:04,527 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:04,543 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-19 05:22:04,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-19 05:22:04,728 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:22:04,729 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:04,729 INFO L85 PathProgramCache]: Analyzing trace with hash 1317434454, now seen corresponding path program 1 times [2023-11-19 05:22:04,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:04,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799525103] [2023-11-19 05:22:04,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:04,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:04,787 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:22:04,788 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1446768463] [2023-11-19 05:22:04,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:04,788 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:04,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:04,793 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:04,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:22:04,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:04,865 INFO L262 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:22:04,867 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:04,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:04,927 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:22:04,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:04,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799525103] [2023-11-19 05:22:04,927 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:22:04,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446768463] [2023-11-19 05:22:04,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446768463] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:04,928 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:22:04,929 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:22:04,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878495925] [2023-11-19 05:22:04,929 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:04,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:22:04,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:04,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:22:04,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:22:04,932 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:22:04,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:04,964 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2023-11-19 05:22:04,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:22:04,966 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2023-11-19 05:22:04,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:04,968 INFO L225 Difference]: With dead ends: 26 [2023-11-19 05:22:04,968 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 05:22:04,970 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:22:04,976 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:04,977 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 39 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:22:04,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 05:22:04,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-19 05:22:04,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:22:04,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-11-19 05:22:04,988 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 14 [2023-11-19 05:22:04,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:04,989 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-11-19 05:22:04,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:22:04,990 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-11-19 05:22:04,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 05:22:04,991 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:04,992 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:05,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:22:05,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:05,218 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:22:05,218 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:05,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1319221914, now seen corresponding path program 1 times [2023-11-19 05:22:05,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:05,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793329687] [2023-11-19 05:22:05,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:05,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:05,236 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:22:05,236 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [75627988] [2023-11-19 05:22:05,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:05,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:05,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:05,244 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:05,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:22:05,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:05,319 INFO L262 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 05:22:05,322 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:05,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:05,529 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:22:05,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:05,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793329687] [2023-11-19 05:22:05,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:22:05,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75627988] [2023-11-19 05:22:05,530 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75627988] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:05,530 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:22:05,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:22:05,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049516446] [2023-11-19 05:22:05,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:05,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:22:05,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:05,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:22:05,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:22:05,533 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:22:05,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:05,594 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2023-11-19 05:22:05,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:22:05,595 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2023-11-19 05:22:05,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:05,596 INFO L225 Difference]: With dead ends: 28 [2023-11-19 05:22:05,596 INFO L226 Difference]: Without dead ends: 26 [2023-11-19 05:22:05,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:22:05,598 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:05,599 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 50 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:22:05,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-19 05:22:05,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-11-19 05:22:05,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.2) internal successors, (18), 17 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:22:05,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2023-11-19 05:22:05,610 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 14 [2023-11-19 05:22:05,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:05,610 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2023-11-19 05:22:05,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:22:05,611 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2023-11-19 05:22:05,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:22:05,612 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:05,612 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:05,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:22:05,824 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:05,825 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:22:05,825 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:05,826 INFO L85 PathProgramCache]: Analyzing trace with hash -1562521278, now seen corresponding path program 1 times [2023-11-19 05:22:05,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:05,826 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592015954] [2023-11-19 05:22:05,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:05,827 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:05,843 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:22:05,844 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1766243688] [2023-11-19 05:22:05,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:05,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:05,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:05,854 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:05,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:22:05,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:05,919 INFO L262 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 05:22:05,930 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:06,066 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:06,066 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:22:06,286 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:06,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:06,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592015954] [2023-11-19 05:22:06,287 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:22:06,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1766243688] [2023-11-19 05:22:06,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1766243688] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:22:06,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1628384886] [2023-11-19 05:22:06,310 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-19 05:22:06,310 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:22:06,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:22:06,320 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:22:06,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:22:07,427 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 67 for LOIs [2023-11-19 05:22:07,607 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 92 for LOIs [2023-11-19 05:22:07,744 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:22:12,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1628384886] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:12,900 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:22:12,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 8] total 21 [2023-11-19 05:22:12,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788383640] [2023-11-19 05:22:12,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:12,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 05:22:12,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:12,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 05:22:12,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2023-11-19 05:22:12,904 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:22:13,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:13,276 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2023-11-19 05:22:13,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-19 05:22:13,277 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2023-11-19 05:22:13,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:13,278 INFO L225 Difference]: With dead ends: 32 [2023-11-19 05:22:13,278 INFO L226 Difference]: Without dead ends: 25 [2023-11-19 05:22:13,279 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2023-11-19 05:22:13,280 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:13,280 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 41 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:22:13,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-19 05:22:13,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-11-19 05:22:13,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:22:13,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2023-11-19 05:22:13,296 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 20 [2023-11-19 05:22:13,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:13,297 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2023-11-19 05:22:13,298 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:22:13,298 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2023-11-19 05:22:13,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 05:22:13,301 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:13,301 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:13,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:22:13,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:13,520 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:22:13,521 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:13,521 INFO L85 PathProgramCache]: Analyzing trace with hash -182192907, now seen corresponding path program 1 times [2023-11-19 05:22:13,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:13,521 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071376899] [2023-11-19 05:22:13,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:13,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:13,530 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:22:13,531 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1663424087] [2023-11-19 05:22:13,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:13,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:13,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:13,532 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:13,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:22:13,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:13,582 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:22:13,584 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:13,622 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:13,622 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:22:13,667 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:13,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:13,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071376899] [2023-11-19 05:22:13,668 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:22:13,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663424087] [2023-11-19 05:22:13,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663424087] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:22:13,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1834497233] [2023-11-19 05:22:13,672 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-19 05:22:13,672 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:22:13,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:22:13,673 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:22:13,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:22:14,598 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-11-19 05:22:14,671 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 96 for LOIs [2023-11-19 05:22:14,761 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:22:27,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '700#(and (or (exists ((|v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_16| Int) (|v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_16| Int) (|v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_26| Int)) (and (<= 0 |v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_26|) (not (= (+ (* |v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_16| |v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_16|) (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_16| 2)) (+ (* |v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_26| 4) (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_16| |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_16|) (* 2 |v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_16|)))) (<= |v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_26| 2147483647))) (exists ((|v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_17| Int) (|v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_17| Int) (|v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_27| Int) (|v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_15| Int)) (and (<= |v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_27| 2147483647) (<= 0 |v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_27|) (not (= (+ (* |v_ULTIMATE.start_main_~r~0#1_BEFORE_CALL_15| 4) (* 2 |v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_17|) (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_17| |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_17|) (* |v_ULTIMATE.start_main_~A~0#1_BEFORE_CALL_27| 4)) (+ (* |v_ULTIMATE.start_main_~v~0#1_BEFORE_CALL_17| 2) (* |v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_17| |v_ULTIMATE.start_main_~u~0#1_BEFORE_CALL_17|))))))) (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-19 05:22:27,661 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:22:27,662 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:22:27,662 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2023-11-19 05:22:27,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045996467] [2023-11-19 05:22:27,662 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:22:27,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:22:27,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:27,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:22:27,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=340, Unknown=2, NotChecked=0, Total=420 [2023-11-19 05:22:27,665 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-19 05:22:27,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:27,804 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2023-11-19 05:22:27,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:22:27,805 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 22 [2023-11-19 05:22:27,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:27,806 INFO L225 Difference]: With dead ends: 56 [2023-11-19 05:22:27,806 INFO L226 Difference]: Without dead ends: 49 [2023-11-19 05:22:27,807 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=98, Invalid=452, Unknown=2, NotChecked=0, Total=552 [2023-11-19 05:22:27,808 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 19 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:22:27,808 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 58 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:22:27,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-11-19 05:22:27,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2023-11-19 05:22:27,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 33 states have internal predecessors, (37), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-19 05:22:27,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2023-11-19 05:22:27,821 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 22 [2023-11-19 05:22:27,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:27,821 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2023-11-19 05:22:27,822 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-19 05:22:27,822 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2023-11-19 05:22:27,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 05:22:27,823 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:27,823 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:27,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:22:28,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:28,029 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:22:28,029 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:28,029 INFO L85 PathProgramCache]: Analyzing trace with hash -180405447, now seen corresponding path program 1 times [2023-11-19 05:22:28,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:28,030 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708244617] [2023-11-19 05:22:28,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:28,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:28,043 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:22:28,043 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [402390853] [2023-11-19 05:22:28,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:28,044 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:28,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:28,047 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:28,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e150e086-8dd0-4b91-8215-0c93d58772c3/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:22:28,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:28,110 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-19 05:22:28,113 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:35,320 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:22:35,320 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:22:39,548 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:22:39,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:39,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708244617] [2023-11-19 05:22:39,548 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:22:39,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402390853] [2023-11-19 05:22:39,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402390853] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:22:39,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407692433] [2023-11-19 05:22:39,551 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-19 05:22:39,551 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:22:39,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:22:39,552 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:22:39,552 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:22:40,334 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2023-11-19 05:22:40,366 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 96 for LOIs [2023-11-19 05:22:40,457 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:22:47,500 WARN L293 SmtUtils]: Spent 5.14s on a formula simplification. DAG size of input: 106 DAG size of output: 97 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)