./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc 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_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh --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 aa34b6970b46b2c3f1bda76d086482188f10831dd44cba913e5171769601c6f3 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 17:34:52,035 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 17:34:52,103 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 17:34:52,109 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 17:34:52,109 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 17:34:52,130 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 17:34:52,130 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 17:34:52,131 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 17:34:52,132 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 17:34:52,132 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 17:34:52,133 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 17:34:52,133 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 17:34:52,134 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 17:34:52,134 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 17:34:52,135 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 17:34:52,135 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 17:34:52,136 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 17:34:52,136 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 17:34:52,137 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 17:34:52,137 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 17:34:52,137 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 17:34:52,138 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 17:34:52,139 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 17:34:52,139 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 17:34:52,140 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 17:34:52,140 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 17:34:52,141 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 17:34:52,141 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 17:34:52,141 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 17:34:52,142 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 17:34:52,142 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 17:34:52,142 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 17:34:52,143 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 17:34:52,143 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 17:34:52,143 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 17:34:52,144 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 17:34:52,144 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 17:34:52,144 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:34:52,144 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 17:34:52,145 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 17:34:52,145 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 17:34:52,145 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 17:34:52,145 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 17:34:52,146 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 17:34:52,146 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 17:34:52,146 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 17:34:52,146 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 17:34:52,146 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_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aa34b6970b46b2c3f1bda76d086482188f10831dd44cba913e5171769601c6f3 [2023-12-02 17:34:52,388 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 17:34:52,406 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 17:34:52,409 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 17:34:52,410 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 17:34:52,410 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 17:34:52,411 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c [2023-12-02 17:34:55,143 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 17:34:55,323 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 17:34:55,324 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c [2023-12-02 17:34:55,332 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/data/28bfeea1c/2631727158254beeab1fcb385d0ad2ff/FLAG3b24b547e [2023-12-02 17:34:55,346 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/data/28bfeea1c/2631727158254beeab1fcb385d0ad2ff [2023-12-02 17:34:55,349 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 17:34:55,350 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 17:34:55,352 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 17:34:55,352 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 17:34:55,357 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 17:34:55,358 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,359 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@371c2a39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55, skipping insertion in model container [2023-12-02 17:34:55,359 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,382 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 17:34:55,533 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_7edc7e66-d980-4193-9a62-0580cc497b03/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c[490,503] [2023-12-02 17:34:55,568 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:34:55,578 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 17:34:55,609 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_7edc7e66-d980-4193-9a62-0580cc497b03/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound10.c[490,503] [2023-12-02 17:34:55,620 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:34:55,634 INFO L206 MainTranslator]: Completed translation [2023-12-02 17:34:55,634 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55 WrapperNode [2023-12-02 17:34:55,634 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 17:34:55,635 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 17:34:55,636 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 17:34:55,636 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 17:34:55,643 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,649 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,670 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 86 [2023-12-02 17:34:55,670 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 17:34:55,671 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 17:34:55,671 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 17:34:55,671 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 17:34:55,679 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,679 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,681 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,681 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,685 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,688 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,689 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,690 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,692 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 17:34:55,693 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 17:34:55,693 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 17:34:55,694 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 17:34:55,694 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (1/1) ... [2023-12-02 17:34:55,700 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:34:55,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:34:55,725 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 17:34:55,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 17:34:55,752 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 17:34:55,752 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 17:34:55,752 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 17:34:55,752 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 17:34:55,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 17:34:55,753 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 17:34:55,753 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 17:34:55,753 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 17:34:55,815 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 17:34:55,817 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 17:34:55,966 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 17:34:55,998 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 17:34:55,998 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 17:34:55,999 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:34:55 BoogieIcfgContainer [2023-12-02 17:34:56,000 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 17:34:56,002 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 17:34:56,002 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 17:34:56,006 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 17:34:56,006 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 05:34:55" (1/3) ... [2023-12-02 17:34:56,006 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30dc7be4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:34:56, skipping insertion in model container [2023-12-02 17:34:56,007 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:34:55" (2/3) ... [2023-12-02 17:34:56,007 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30dc7be4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:34:56, skipping insertion in model container [2023-12-02 17:34:56,007 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:34:55" (3/3) ... [2023-12-02 17:34:56,008 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound10.c [2023-12-02 17:34:56,027 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 17:34:56,027 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 17:34:56,066 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 17:34:56,072 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;@22954074, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 17:34:56,072 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 17:34:56,075 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 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) [2023-12-02 17:34:56,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 17:34:56,082 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:34:56,083 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:34:56,084 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:34:56,089 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:34:56,089 INFO L85 PathProgramCache]: Analyzing trace with hash 1288775727, now seen corresponding path program 1 times [2023-12-02 17:34:56,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:34:56,099 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559969808] [2023-12-02 17:34:56,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:34:56,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:34:56,185 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:34:56,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [321894678] [2023-12-02 17:34:56,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:34:56,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:34:56,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:34:56,188 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:34:56,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 17:34:56,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:34:56,275 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 1 conjunts are in the unsatisfiable core [2023-12-02 17:34:56,279 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:34:56,300 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 17:34:56,300 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:34:56,301 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:34:56,301 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559969808] [2023-12-02 17:34:56,301 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:34:56,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321894678] [2023-12-02 17:34:56,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321894678] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:34:56,302 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:34:56,303 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 17:34:56,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100241926] [2023-12-02 17:34:56,305 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:34:56,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-02 17:34:56,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:34:56,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-02 17:34:56,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 17:34:56,338 INFO L87 Difference]: Start difference. First operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 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 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 17:34:56,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:34:56,367 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2023-12-02 17:34:56,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-02 17:34:56,369 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2023-12-02 17:34:56,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:34:56,376 INFO L225 Difference]: With dead ends: 50 [2023-12-02 17:34:56,376 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 17:34:56,379 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 17:34:56,383 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:34:56,384 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:34:56,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 17:34:56,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-12-02 17:34:56,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 16 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 17:34:56,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 38 transitions. [2023-12-02 17:34:56,417 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 38 transitions. Word has length 19 [2023-12-02 17:34:56,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:34:56,418 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 38 transitions. [2023-12-02 17:34:56,418 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 17:34:56,418 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 38 transitions. [2023-12-02 17:34:56,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 17:34:56,420 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:34:56,420 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:34:56,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 17:34:56,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-02 17:34:56,621 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:34:56,622 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:34:56,622 INFO L85 PathProgramCache]: Analyzing trace with hash 226858993, now seen corresponding path program 1 times [2023-12-02 17:34:56,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:34:56,623 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896423918] [2023-12-02 17:34:56,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:34:56,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:34:56,641 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:34:56,641 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [786891455] [2023-12-02 17:34:56,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:34:56,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:34:56,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:34:56,643 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:34:56,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 17:34:56,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:34:56,700 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 17:34:56,703 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:34:56,769 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 17:34:56,769 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:34:56,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:34:56,770 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896423918] [2023-12-02 17:34:56,770 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:34:56,770 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786891455] [2023-12-02 17:34:56,770 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [786891455] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:34:56,771 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:34:56,771 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 17:34:56,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568028035] [2023-12-02 17:34:56,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:34:56,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 17:34:56,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:34:56,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 17:34:56,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:34:56,773 INFO L87 Difference]: Start difference. First operand 27 states and 38 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 17:34:56,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:34:56,793 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2023-12-02 17:34:56,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 17:34:56,793 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2023-12-02 17:34:56,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:34:56,795 INFO L225 Difference]: With dead ends: 37 [2023-12-02 17:34:56,795 INFO L226 Difference]: Without dead ends: 29 [2023-12-02 17:34:56,795 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:34:56,797 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:34:56,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:34:56,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-12-02 17:34:56,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-12-02 17:34:56,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 17:34:56,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2023-12-02 17:34:56,806 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 20 [2023-12-02 17:34:56,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:34:56,807 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2023-12-02 17:34:56,807 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, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 17:34:56,807 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2023-12-02 17:34:56,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 17:34:56,808 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:34:56,808 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:34:56,814 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 17:34:57,011 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 17:34:57,012 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:34:57,013 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:34:57,013 INFO L85 PathProgramCache]: Analyzing trace with hash -1563892497, now seen corresponding path program 1 times [2023-12-02 17:34:57,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:34:57,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561261918] [2023-12-02 17:34:57,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:34:57,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:34:57,028 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:34:57,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1894840079] [2023-12-02 17:34:57,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:34:57,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:34:57,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:34:57,029 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:34:57,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 17:34:57,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:34:57,089 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 17:34:57,091 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:34:57,127 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 17:34:57,127 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:34:57,191 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 17:34:57,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:34:57,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561261918] [2023-12-02 17:34:57,191 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:34:57,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894840079] [2023-12-02 17:34:57,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1894840079] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:34:57,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [944632552] [2023-12-02 17:34:57,211 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 17:34:57,212 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:34:57,215 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:34:57,220 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:34:57,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:34:58,305 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:34:58,307 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:34:59,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [944632552] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:34:59,482 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:34:59,482 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 5] total 15 [2023-12-02 17:34:59,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429552788] [2023-12-02 17:34:59,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:34:59,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 17:34:59,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:34:59,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 17:34:59,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2023-12-02 17:34:59,485 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 17:34:59,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:34:59,644 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2023-12-02 17:34:59,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 17:34:59,645 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2023-12-02 17:34:59,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:34:59,646 INFO L225 Difference]: With dead ends: 38 [2023-12-02 17:34:59,646 INFO L226 Difference]: Without dead ends: 30 [2023-12-02 17:34:59,647 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2023-12-02 17:34:59,648 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:34:59,649 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 108 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:34:59,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-12-02 17:34:59,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-12-02 17:34:59,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 17:34:59,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2023-12-02 17:34:59,659 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 21 [2023-12-02 17:34:59,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:34:59,660 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2023-12-02 17:34:59,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 17:34:59,660 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2023-12-02 17:34:59,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 17:34:59,661 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:34:59,661 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:34:59,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 17:34:59,861 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-12-02 17:34:59,862 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:34:59,862 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:34:59,862 INFO L85 PathProgramCache]: Analyzing trace with hash 281079646, now seen corresponding path program 1 times [2023-12-02 17:34:59,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:34:59,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929382555] [2023-12-02 17:34:59,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:34:59,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:34:59,873 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:34:59,874 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [521498530] [2023-12-02 17:34:59,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:34:59,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:34:59,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:34:59,875 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:34:59,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 17:34:59,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:34:59,926 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 17:34:59,928 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:34:59,997 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 17:34:59,997 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:35:00,063 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 17:35:00,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:00,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929382555] [2023-12-02 17:35:00,064 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:00,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521498530] [2023-12-02 17:35:00,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521498530] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 17:35:00,064 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:35:00,064 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2023-12-02 17:35:00,064 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153566690] [2023-12-02 17:35:00,064 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:35:00,065 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:35:00,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:35:00,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:35:00,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-12-02 17:35:00,066 INFO L87 Difference]: Start difference. First operand 30 states and 41 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), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 17:35:00,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:35:00,140 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2023-12-02 17:35:00,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:35:00,141 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), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 23 [2023-12-02 17:35:00,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:35:00,142 INFO L225 Difference]: With dead ends: 36 [2023-12-02 17:35:00,142 INFO L226 Difference]: Without dead ends: 34 [2023-12-02 17:35:00,143 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 17:35:00,144 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 8 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:35:00,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 104 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:35:00,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-12-02 17:35:00,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-12-02 17:35:00,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 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) [2023-12-02 17:35:00,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2023-12-02 17:35:00,165 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 23 [2023-12-02 17:35:00,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:35:00,165 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2023-12-02 17:35:00,165 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), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 17:35:00,166 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2023-12-02 17:35:00,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 17:35:00,167 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:35:00,167 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:35:00,171 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 17:35:00,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:00,372 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:35:00,372 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:35:00,372 INFO L85 PathProgramCache]: Analyzing trace with hash -717512630, now seen corresponding path program 1 times [2023-12-02 17:35:00,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:35:00,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145334566] [2023-12-02 17:35:00,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:00,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:35:00,384 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:35:00,384 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1534717622] [2023-12-02 17:35:00,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:00,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:00,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:35:00,385 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:35:00,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 17:35:00,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:35:00,434 INFO L262 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 17:35:00,436 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:35:00,470 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 17:35:00,470 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:35:00,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:00,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145334566] [2023-12-02 17:35:00,470 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:00,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534717622] [2023-12-02 17:35:00,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534717622] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:35:00,471 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:35:00,471 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 17:35:00,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194678641] [2023-12-02 17:35:00,471 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:35:00,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:35:00,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:35:00,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:35:00,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:35:00,473 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 17:35:00,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:35:00,497 INFO L93 Difference]: Finished difference Result 59 states and 77 transitions. [2023-12-02 17:35:00,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 17:35:00,498 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 26 [2023-12-02 17:35:00,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:35:00,499 INFO L225 Difference]: With dead ends: 59 [2023-12-02 17:35:00,499 INFO L226 Difference]: Without dead ends: 36 [2023-12-02 17:35:00,499 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:35:00,500 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:35:00,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 113 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:35:00,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-12-02 17:35:00,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-12-02 17:35:00,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 23 states have internal predecessors, (27), 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) [2023-12-02 17:35:00,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2023-12-02 17:35:00,513 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 26 [2023-12-02 17:35:00,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:35:00,514 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2023-12-02 17:35:00,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-12-02 17:35:00,514 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2023-12-02 17:35:00,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-12-02 17:35:00,515 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:35:00,515 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:35:00,519 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 17:35:00,715 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:00,716 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:35:00,716 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:35:00,716 INFO L85 PathProgramCache]: Analyzing trace with hash -207347326, now seen corresponding path program 1 times [2023-12-02 17:35:00,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:35:00,716 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045532625] [2023-12-02 17:35:00,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:00,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:35:00,725 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:35:00,725 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1977926782] [2023-12-02 17:35:00,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:00,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:00,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:35:00,726 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:35:00,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 17:35:00,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:35:00,771 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 17:35:00,774 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:35:00,933 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 17:35:00,933 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:35:01,043 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 17:35:01,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:01,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045532625] [2023-12-02 17:35:01,044 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:01,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977926782] [2023-12-02 17:35:01,044 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977926782] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 17:35:01,044 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:35:01,044 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2023-12-02 17:35:01,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591249181] [2023-12-02 17:35:01,044 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:35:01,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:35:01,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:35:01,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:35:01,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 17:35:01,046 INFO L87 Difference]: Start difference. First operand 36 states and 46 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 17:35:01,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:35:01,104 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2023-12-02 17:35:01,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:35:01,104 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 28 [2023-12-02 17:35:01,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:35:01,106 INFO L225 Difference]: With dead ends: 50 [2023-12-02 17:35:01,106 INFO L226 Difference]: Without dead ends: 48 [2023-12-02 17:35:01,106 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-12-02 17:35:01,107 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 7 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:35:01,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 121 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:35:01,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-12-02 17:35:01,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2023-12-02 17:35:01,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 28 states have (on average 1.25) internal successors, (35), 29 states have internal predecessors, (35), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-12-02 17:35:01,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 62 transitions. [2023-12-02 17:35:01,120 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 62 transitions. Word has length 28 [2023-12-02 17:35:01,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:35:01,120 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 62 transitions. [2023-12-02 17:35:01,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 17:35:01,121 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 62 transitions. [2023-12-02 17:35:01,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 17:35:01,122 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:35:01,122 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:35:01,127 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 17:35:01,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:01,323 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:35:01,324 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:35:01,324 INFO L85 PathProgramCache]: Analyzing trace with hash -159662690, now seen corresponding path program 1 times [2023-12-02 17:35:01,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:35:01,324 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20171988] [2023-12-02 17:35:01,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:01,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:35:01,335 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:35:01,335 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [119002295] [2023-12-02 17:35:01,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:01,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:01,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:35:01,337 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:35:01,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 17:35:01,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:35:01,394 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 17:35:01,396 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:35:01,569 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 17:35:01,569 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:35:01,733 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 17:35:01,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:01,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20171988] [2023-12-02 17:35:01,733 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:01,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119002295] [2023-12-02 17:35:01,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119002295] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 17:35:01,734 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:35:01,734 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2023-12-02 17:35:01,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893570477] [2023-12-02 17:35:01,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:35:01,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:35:01,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:35:01,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:35:01,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 17:35:01,737 INFO L87 Difference]: Start difference. First operand 47 states and 62 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 17:35:01,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:35:01,800 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2023-12-02 17:35:01,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:35:01,801 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 33 [2023-12-02 17:35:01,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:35:01,802 INFO L225 Difference]: With dead ends: 54 [2023-12-02 17:35:01,802 INFO L226 Difference]: Without dead ends: 52 [2023-12-02 17:35:01,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-12-02 17:35:01,803 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 7 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:35:01,804 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 112 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:35:01,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-12-02 17:35:01,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2023-12-02 17:35:01,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 32 states have internal predecessors, (38), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-12-02 17:35:01,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 65 transitions. [2023-12-02 17:35:01,820 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 65 transitions. Word has length 33 [2023-12-02 17:35:01,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:35:01,821 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 65 transitions. [2023-12-02 17:35:01,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-12-02 17:35:01,821 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 65 transitions. [2023-12-02 17:35:01,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-12-02 17:35:01,822 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:35:01,823 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:35:01,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 17:35:02,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 17:35:02,028 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:35:02,028 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:35:02,028 INFO L85 PathProgramCache]: Analyzing trace with hash -2048234814, now seen corresponding path program 1 times [2023-12-02 17:35:02,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:35:02,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212590264] [2023-12-02 17:35:02,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:02,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:35:02,039 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:35:02,039 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2053057467] [2023-12-02 17:35:02,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:02,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:02,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:35:02,041 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:35:02,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 17:35:02,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:35:02,094 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 17:35:02,096 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:35:02,308 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 17:35:02,308 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:35:02,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:02,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212590264] [2023-12-02 17:35:02,427 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:02,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053057467] [2023-12-02 17:35:02,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2053057467] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:35:02,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1333915078] [2023-12-02 17:35:02,430 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 17:35:02,430 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:35:02,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:35:02,431 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:35:02,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:35:03,490 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 17:35:03,494 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:35:03,495 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:35:06,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1333915078] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:35:06,947 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:35:06,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [9] total 24 [2023-12-02 17:35:06,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837865990] [2023-12-02 17:35:06,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:35:06,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 17:35:06,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:35:06,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 17:35:06,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2023-12-02 17:35:06,949 INFO L87 Difference]: Start difference. First operand 51 states and 65 transitions. Second operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-12-02 17:35:07,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:35:07,346 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2023-12-02 17:35:07,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 17:35:07,346 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 38 [2023-12-02 17:35:07,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:35:07,348 INFO L225 Difference]: With dead ends: 75 [2023-12-02 17:35:07,348 INFO L226 Difference]: Without dead ends: 73 [2023-12-02 17:35:07,348 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702 [2023-12-02 17:35:07,349 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 1 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:35:07,349 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 99 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 17:35:07,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-12-02 17:35:07,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2023-12-02 17:35:07,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 45 states have internal predecessors, (50), 18 states have call successors, (18), 9 states have call predecessors, (18), 9 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2023-12-02 17:35:07,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2023-12-02 17:35:07,362 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 38 [2023-12-02 17:35:07,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:35:07,362 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2023-12-02 17:35:07,363 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2023-12-02 17:35:07,363 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2023-12-02 17:35:07,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 17:35:07,364 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:35:07,364 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:35:07,368 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 17:35:07,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 17:35:07,564 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:35:07,565 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:35:07,565 INFO L85 PathProgramCache]: Analyzing trace with hash 2026078407, now seen corresponding path program 1 times [2023-12-02 17:35:07,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:35:07,565 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461751371] [2023-12-02 17:35:07,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:07,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:35:07,572 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:35:07,572 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1579099364] [2023-12-02 17:35:07,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:07,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:07,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:35:07,574 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:35:07,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 17:35:07,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:35:07,625 INFO L262 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 17:35:07,627 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:35:07,688 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 17:35:07,688 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:35:07,744 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 17:35:07,745 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:07,745 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461751371] [2023-12-02 17:35:07,745 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:07,745 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579099364] [2023-12-02 17:35:07,745 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579099364] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:35:07,745 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1326354508] [2023-12-02 17:35:07,748 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 17:35:07,748 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:35:07,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:35:07,749 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:35:07,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:35:12,706 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 113 for LOIs [2023-12-02 17:35:13,007 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:35:13,008 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:35:18,284 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2391#(and (<= 2 ~counter~0) (<= ~counter~0 10) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:35:18,284 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:35:18,284 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:35:18,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2023-12-02 17:35:18,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34938470] [2023-12-02 17:35:18,284 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:35:18,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 17:35:18,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:35:18,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 17:35:18,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=593, Unknown=0, NotChecked=0, Total=756 [2023-12-02 17:35:18,286 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 17:35:18,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:35:18,454 INFO L93 Difference]: Finished difference Result 192 states and 235 transitions. [2023-12-02 17:35:18,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 17:35:18,454 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 47 [2023-12-02 17:35:18,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:35:18,457 INFO L225 Difference]: With dead ends: 192 [2023-12-02 17:35:18,457 INFO L226 Difference]: Without dead ends: 184 [2023-12-02 17:35:18,458 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 109 SyntacticMatches, 4 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=197, Invalid=795, Unknown=0, NotChecked=0, Total=992 [2023-12-02 17:35:18,458 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 76 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:35:18,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 151 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:35:18,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2023-12-02 17:35:18,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 176. [2023-12-02 17:35:18,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 110 states have (on average 1.2181818181818183) internal successors, (134), 114 states have internal predecessors, (134), 44 states have call successors, (44), 21 states have call predecessors, (44), 21 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2023-12-02 17:35:18,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 218 transitions. [2023-12-02 17:35:18,493 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 218 transitions. Word has length 47 [2023-12-02 17:35:18,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:35:18,493 INFO L495 AbstractCegarLoop]: Abstraction has 176 states and 218 transitions. [2023-12-02 17:35:18,494 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 10 states have internal predecessors, (33), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 17:35:18,494 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 218 transitions. [2023-12-02 17:35:18,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-12-02 17:35:18,495 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:35:18,495 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:35:18,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 17:35:18,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:18,701 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:35:18,701 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:35:18,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1622665511, now seen corresponding path program 1 times [2023-12-02 17:35:18,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:35:18,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135009004] [2023-12-02 17:35:18,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:18,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:35:18,709 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:35:18,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1790322552] [2023-12-02 17:35:18,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:18,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:18,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:35:18,710 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:35:18,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 17:35:18,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:35:18,757 INFO L262 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 17:35:18,759 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:35:18,798 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 17:35:18,799 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:35:18,858 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 17:35:18,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:18,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135009004] [2023-12-02 17:35:18,858 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:18,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790322552] [2023-12-02 17:35:18,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790322552] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:35:18,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [636625804] [2023-12-02 17:35:18,860 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 17:35:18,861 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:35:18,861 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:35:18,861 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:35:18,861 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:35:23,002 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 109 for LOIs [2023-12-02 17:35:23,210 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:35:23,211 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:35:29,266 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3237#(and (<= 2 ~counter~0) (<= ~counter~0 10) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:35:29,267 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:35:29,267 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:35:29,267 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2023-12-02 17:35:29,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513698683] [2023-12-02 17:35:29,267 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:35:29,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 17:35:29,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:35:29,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 17:35:29,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2023-12-02 17:35:29,269 INFO L87 Difference]: Start difference. First operand 176 states and 218 transitions. Second operand has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 17:35:29,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:35:29,517 INFO L93 Difference]: Finished difference Result 264 states and 353 transitions. [2023-12-02 17:35:29,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 17:35:29,518 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 48 [2023-12-02 17:35:29,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:35:29,520 INFO L225 Difference]: With dead ends: 264 [2023-12-02 17:35:29,520 INFO L226 Difference]: Without dead ends: 244 [2023-12-02 17:35:29,521 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2023-12-02 17:35:29,522 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 68 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:35:29,522 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 229 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:35:29,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2023-12-02 17:35:29,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 220. [2023-12-02 17:35:29,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 140 states have (on average 1.25) internal successors, (175), 143 states have internal predecessors, (175), 58 states have call successors, (58), 21 states have call predecessors, (58), 21 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) [2023-12-02 17:35:29,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 288 transitions. [2023-12-02 17:35:29,566 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 288 transitions. Word has length 48 [2023-12-02 17:35:29,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:35:29,566 INFO L495 AbstractCegarLoop]: Abstraction has 220 states and 288 transitions. [2023-12-02 17:35:29,567 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 17:35:29,567 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 288 transitions. [2023-12-02 17:35:29,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 17:35:29,568 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:35:29,568 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:35:29,573 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 17:35:29,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 17:35:29,774 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:35:29,774 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:35:29,774 INFO L85 PathProgramCache]: Analyzing trace with hash -1919469378, now seen corresponding path program 1 times [2023-12-02 17:35:29,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:35:29,774 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741384286] [2023-12-02 17:35:29,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:29,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:35:29,782 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:35:29,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1963656511] [2023-12-02 17:35:29,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:29,782 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:29,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:35:29,783 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:35:29,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 17:35:29,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:35:29,827 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 17:35:29,829 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:35:29,871 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 17:35:29,871 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:35:29,920 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 17:35:29,920 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:29,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741384286] [2023-12-02 17:35:29,920 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:29,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963656511] [2023-12-02 17:35:29,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963656511] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:35:29,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1648384771] [2023-12-02 17:35:29,923 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 17:35:29,923 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:35:29,923 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:35:29,923 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:35:29,923 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:35:36,285 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 17:35:36,288 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:35:36,289 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:35:39,918 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4284#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:35:39,918 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:35:39,918 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:35:39,918 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2023-12-02 17:35:39,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523988966] [2023-12-02 17:35:39,918 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:35:39,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 17:35:39,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:35:39,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 17:35:39,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=775, Unknown=0, NotChecked=0, Total=930 [2023-12-02 17:35:39,920 INFO L87 Difference]: Start difference. First operand 220 states and 288 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 17:35:40,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:35:40,096 INFO L93 Difference]: Finished difference Result 331 states and 438 transitions. [2023-12-02 17:35:40,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 17:35:40,096 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 50 [2023-12-02 17:35:40,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:35:40,098 INFO L225 Difference]: With dead ends: 331 [2023-12-02 17:35:40,098 INFO L226 Difference]: Without dead ends: 235 [2023-12-02 17:35:40,099 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=185, Invalid=1005, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 17:35:40,100 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 70 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:35:40,100 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 152 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:35:40,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2023-12-02 17:35:40,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 229. [2023-12-02 17:35:40,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 149 states have (on average 1.1946308724832215) internal successors, (178), 152 states have internal predecessors, (178), 58 states have call successors, (58), 21 states have call predecessors, (58), 21 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) [2023-12-02 17:35:40,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 291 transitions. [2023-12-02 17:35:40,139 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 291 transitions. Word has length 50 [2023-12-02 17:35:40,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:35:40,139 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 291 transitions. [2023-12-02 17:35:40,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-12-02 17:35:40,139 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 291 transitions. [2023-12-02 17:35:40,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 17:35:40,140 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:35:40,140 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:35:40,145 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 17:35:40,341 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 17:35:40,341 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:35:40,341 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:35:40,341 INFO L85 PathProgramCache]: Analyzing trace with hash -944843688, now seen corresponding path program 1 times [2023-12-02 17:35:40,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:35:40,342 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628199840] [2023-12-02 17:35:40,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:40,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:35:40,348 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:35:40,348 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [302508496] [2023-12-02 17:35:40,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:40,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:40,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:35:40,349 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:35:40,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 17:35:40,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:35:40,405 INFO L262 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 26 conjunts are in the unsatisfiable core [2023-12-02 17:35:40,407 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:35:40,485 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 23 proven. 12 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 17:35:40,485 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:35:40,592 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 22 proven. 7 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 17:35:40,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:40,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628199840] [2023-12-02 17:35:40,592 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:40,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302508496] [2023-12-02 17:35:40,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302508496] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:35:40,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [975321657] [2023-12-02 17:35:40,595 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:35:40,595 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:35:40,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:35:40,595 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:35:40,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:35:44,725 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 113 for LOIs [2023-12-02 17:35:44,951 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:35:44,952 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:35:50,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5467#(and (<= 2 ~counter~0) (<= ~counter~0 10) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:35:50,977 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:35:50,977 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:35:50,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 13 [2023-12-02 17:35:50,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205291089] [2023-12-02 17:35:50,978 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:35:50,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 17:35:50,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:35:50,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 17:35:50,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2023-12-02 17:35:50,979 INFO L87 Difference]: Start difference. First operand 229 states and 291 transitions. Second operand has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 6 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2023-12-02 17:35:51,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:35:51,364 INFO L93 Difference]: Finished difference Result 315 states and 418 transitions. [2023-12-02 17:35:51,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 17:35:51,364 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 6 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 55 [2023-12-02 17:35:51,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:35:51,367 INFO L225 Difference]: With dead ends: 315 [2023-12-02 17:35:51,367 INFO L226 Difference]: Without dead ends: 309 [2023-12-02 17:35:51,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 132 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=171, Invalid=1089, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 17:35:51,369 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 41 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:35:51,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 263 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:35:51,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2023-12-02 17:35:51,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 276. [2023-12-02 17:35:51,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 182 states have (on average 1.2142857142857142) internal successors, (221), 191 states have internal predecessors, (221), 69 states have call successors, (69), 24 states have call predecessors, (69), 24 states have return successors, (65), 60 states have call predecessors, (65), 65 states have call successors, (65) [2023-12-02 17:35:51,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 355 transitions. [2023-12-02 17:35:51,416 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 355 transitions. Word has length 55 [2023-12-02 17:35:51,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:35:51,416 INFO L495 AbstractCegarLoop]: Abstraction has 276 states and 355 transitions. [2023-12-02 17:35:51,416 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 6 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2023-12-02 17:35:51,417 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 355 transitions. [2023-12-02 17:35:51,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-12-02 17:35:51,417 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:35:51,418 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 2, 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] [2023-12-02 17:35:51,423 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 17:35:51,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 17:35:51,618 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:35:51,619 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:35:51,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1149067400, now seen corresponding path program 2 times [2023-12-02 17:35:51,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:35:51,619 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592973876] [2023-12-02 17:35:51,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:35:51,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:35:51,629 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:35:51,629 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [109648253] [2023-12-02 17:35:51,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:35:51,629 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:35:51,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:35:51,630 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:35:51,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 17:35:51,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 17:35:51,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:35:51,693 INFO L262 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 39 conjunts are in the unsatisfiable core [2023-12-02 17:35:51,695 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:35:52,077 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 14 proven. 10 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-12-02 17:35:52,078 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:35:52,461 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 17:35:52,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:35:52,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592973876] [2023-12-02 17:35:52,462 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:35:52,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109648253] [2023-12-02 17:35:52,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109648253] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:35:52,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [774036990] [2023-12-02 17:35:52,464 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:35:52,464 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:35:52,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:35:52,464 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:35:52,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:35:56,692 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 113 for LOIs [2023-12-02 17:35:56,908 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:35:56,909 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:36:03,918 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6739#(and (<= 2 ~counter~0) (<= ~counter~0 10) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:36:03,918 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:36:03,918 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:36:03,918 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2023-12-02 17:36:03,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582020191] [2023-12-02 17:36:03,918 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:36:03,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 17:36:03,918 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:36:03,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 17:36:03,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1021, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 17:36:03,920 INFO L87 Difference]: Start difference. First operand 276 states and 355 transitions. Second operand has 17 states, 15 states have (on average 2.533333333333333) internal successors, (38), 14 states have internal predecessors, (38), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2023-12-02 17:36:09,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:36:09,005 INFO L93 Difference]: Finished difference Result 467 states and 643 transitions. [2023-12-02 17:36:09,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 17:36:09,005 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.533333333333333) internal successors, (38), 14 states have internal predecessors, (38), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) Word has length 60 [2023-12-02 17:36:09,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:36:09,009 INFO L225 Difference]: With dead ends: 467 [2023-12-02 17:36:09,009 INFO L226 Difference]: Without dead ends: 465 [2023-12-02 17:36:09,010 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 139 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=433, Invalid=2219, Unknown=0, NotChecked=0, Total=2652 [2023-12-02 17:36:09,011 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 193 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-12-02 17:36:09,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [197 Valid, 331 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-12-02 17:36:09,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2023-12-02 17:36:09,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 413. [2023-12-02 17:36:09,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 272 states have (on average 1.2647058823529411) internal successors, (344), 284 states have internal predecessors, (344), 108 states have call successors, (108), 32 states have call predecessors, (108), 32 states have return successors, (104), 96 states have call predecessors, (104), 104 states have call successors, (104) [2023-12-02 17:36:09,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 556 transitions. [2023-12-02 17:36:09,098 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 556 transitions. Word has length 60 [2023-12-02 17:36:09,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:36:09,098 INFO L495 AbstractCegarLoop]: Abstraction has 413 states and 556 transitions. [2023-12-02 17:36:09,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.533333333333333) internal successors, (38), 14 states have internal predecessors, (38), 9 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2023-12-02 17:36:09,099 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 556 transitions. [2023-12-02 17:36:09,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 17:36:09,100 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:36:09,100 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 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] [2023-12-02 17:36:09,104 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 17:36:09,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:36:09,300 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:36:09,301 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:36:09,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1428661434, now seen corresponding path program 1 times [2023-12-02 17:36:09,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:36:09,301 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067138416] [2023-12-02 17:36:09,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:36:09,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:36:09,308 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:36:09,308 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1276875158] [2023-12-02 17:36:09,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:36:09,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:36:09,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:36:09,309 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:36:09,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 17:36:09,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:36:09,357 INFO L262 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 17:36:09,359 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:36:09,427 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 17:36:09,427 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:36:09,510 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 17:36:09,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:36:09,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067138416] [2023-12-02 17:36:09,511 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:36:09,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276875158] [2023-12-02 17:36:09,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276875158] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:36:09,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [201285880] [2023-12-02 17:36:09,513 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 17:36:09,513 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:36:09,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:36:09,513 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:36:09,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:36:12,018 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 17:36:12,021 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:36:12,022 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:36:15,428 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8462#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:36:15,428 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:36:15,428 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:36:15,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2023-12-02 17:36:15,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560128511] [2023-12-02 17:36:15,429 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:36:15,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 17:36:15,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:36:15,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 17:36:15,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2023-12-02 17:36:15,430 INFO L87 Difference]: Start difference. First operand 413 states and 556 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-12-02 17:36:15,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:36:15,650 INFO L93 Difference]: Finished difference Result 430 states and 575 transitions. [2023-12-02 17:36:15,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 17:36:15,650 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 61 [2023-12-02 17:36:15,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:36:15,654 INFO L225 Difference]: With dead ends: 430 [2023-12-02 17:36:15,654 INFO L226 Difference]: Without dead ends: 428 [2023-12-02 17:36:15,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=116, Invalid=696, Unknown=0, NotChecked=0, Total=812 [2023-12-02 17:36:15,655 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 17 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:36:15,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 130 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:36:15,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2023-12-02 17:36:15,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 428. [2023-12-02 17:36:15,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 281 states have (on average 1.2526690391459074) internal successors, (352), 293 states have internal predecessors, (352), 111 states have call successors, (111), 35 states have call predecessors, (111), 35 states have return successors, (107), 99 states have call predecessors, (107), 107 states have call successors, (107) [2023-12-02 17:36:15,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 570 transitions. [2023-12-02 17:36:15,737 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 570 transitions. Word has length 61 [2023-12-02 17:36:15,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:36:15,738 INFO L495 AbstractCegarLoop]: Abstraction has 428 states and 570 transitions. [2023-12-02 17:36:15,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-12-02 17:36:15,738 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 570 transitions. [2023-12-02 17:36:15,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-12-02 17:36:15,738 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:36:15,739 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:36:15,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 17:36:15,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:36:15,939 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:36:15,939 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:36:15,940 INFO L85 PathProgramCache]: Analyzing trace with hash -789837288, now seen corresponding path program 3 times [2023-12-02 17:36:15,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:36:15,940 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223240897] [2023-12-02 17:36:15,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:36:15,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:36:15,947 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:36:15,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1469559426] [2023-12-02 17:36:15,948 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:36:15,948 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:36:15,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:36:15,949 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:36:15,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 17:36:16,001 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:36:16,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:36:16,002 INFO L262 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 33 conjunts are in the unsatisfiable core [2023-12-02 17:36:16,004 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:36:16,313 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 31 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 17:36:16,313 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:36:17,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:36:17,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223240897] [2023-12-02 17:36:17,134 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:36:17,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469559426] [2023-12-02 17:36:17,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469559426] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:36:17,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [114983072] [2023-12-02 17:36:17,136 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:36:17,136 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:36:17,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:36:17,136 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:36:17,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:36:21,383 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 113 for LOIs [2023-12-02 17:36:21,605 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:36:21,606 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:36:29,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10033#(and (<= 2 ~counter~0) (<= ~counter~0 10) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:36:29,858 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:36:29,858 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:36:29,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2023-12-02 17:36:29,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232466632] [2023-12-02 17:36:29,858 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 17:36:29,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 17:36:29,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:36:29,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 17:36:29,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=852, Unknown=0, NotChecked=0, Total=992 [2023-12-02 17:36:29,859 INFO L87 Difference]: Start difference. First operand 428 states and 570 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 17:36:30,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:36:30,450 INFO L93 Difference]: Finished difference Result 657 states and 916 transitions. [2023-12-02 17:36:30,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 17:36:30,451 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 65 [2023-12-02 17:36:30,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:36:30,454 INFO L225 Difference]: With dead ends: 657 [2023-12-02 17:36:30,455 INFO L226 Difference]: Without dead ends: 652 [2023-12-02 17:36:30,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=163, Invalid=1027, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 17:36:30,456 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 28 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:36:30,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 246 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 17:36:30,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2023-12-02 17:36:30,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 642. [2023-12-02 17:36:30,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 642 states, 418 states have (on average 1.291866028708134) internal successors, (540), 435 states have internal predecessors, (540), 181 states have call successors, (181), 43 states have call predecessors, (181), 42 states have return successors, (177), 163 states have call predecessors, (177), 177 states have call successors, (177) [2023-12-02 17:36:30,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 642 states to 642 states and 898 transitions. [2023-12-02 17:36:30,594 INFO L78 Accepts]: Start accepts. Automaton has 642 states and 898 transitions. Word has length 65 [2023-12-02 17:36:30,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:36:30,595 INFO L495 AbstractCegarLoop]: Abstraction has 642 states and 898 transitions. [2023-12-02 17:36:30,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 17:36:30,595 INFO L276 IsEmpty]: Start isEmpty. Operand 642 states and 898 transitions. [2023-12-02 17:36:30,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 17:36:30,596 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:36:30,596 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:36:30,600 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 17:36:30,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:36:30,797 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:36:30,797 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:36:30,797 INFO L85 PathProgramCache]: Analyzing trace with hash 1872706257, now seen corresponding path program 1 times [2023-12-02 17:36:30,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:36:30,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709755295] [2023-12-02 17:36:30,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:36:30,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:36:30,805 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:36:30,805 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1847439584] [2023-12-02 17:36:30,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:36:30,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:36:30,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:36:30,807 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:36:30,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 17:36:30,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:36:30,870 INFO L262 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 41 conjunts are in the unsatisfiable core [2023-12-02 17:36:30,872 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:36:31,369 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2023-12-02 17:36:31,369 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:36:32,234 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2023-12-02 17:36:32,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:36:32,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709755295] [2023-12-02 17:36:32,235 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:36:32,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847439584] [2023-12-02 17:36:32,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847439584] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:36:32,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [529319452] [2023-12-02 17:36:32,237 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 17:36:32,237 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:36:32,237 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:36:32,237 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:36:32,237 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:36:44,037 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 17:36:44,039 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:36:44,041 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:36:47,689 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12432#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:36:47,689 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:36:47,689 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:36:47,689 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2023-12-02 17:36:47,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113264649] [2023-12-02 17:36:47,689 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:36:47,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 17:36:47,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:36:47,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 17:36:47,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1383, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 17:36:47,692 INFO L87 Difference]: Start difference. First operand 642 states and 898 transitions. Second operand has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2023-12-02 17:36:58,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:36:58,573 INFO L93 Difference]: Finished difference Result 958 states and 1413 transitions. [2023-12-02 17:36:58,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-12-02 17:36:58,574 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 71 [2023-12-02 17:36:58,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:36:58,579 INFO L225 Difference]: With dead ends: 958 [2023-12-02 17:36:58,579 INFO L226 Difference]: Without dead ends: 943 [2023-12-02 17:36:58,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1096 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=499, Invalid=3407, Unknown=0, NotChecked=0, Total=3906 [2023-12-02 17:36:58,582 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 157 mSDsluCounter, 511 mSDsCounter, 0 mSdLazyCounter, 549 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 565 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:36:58,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 565 Invalid, 676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 549 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2023-12-02 17:36:58,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 943 states. [2023-12-02 17:36:58,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 943 to 877. [2023-12-02 17:36:58,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 877 states, 566 states have (on average 1.342756183745583) internal successors, (760), 585 states have internal predecessors, (760), 267 states have call successors, (267), 43 states have call predecessors, (267), 43 states have return successors, (265), 248 states have call predecessors, (265), 265 states have call successors, (265) [2023-12-02 17:36:58,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 877 states to 877 states and 1292 transitions. [2023-12-02 17:36:58,911 INFO L78 Accepts]: Start accepts. Automaton has 877 states and 1292 transitions. Word has length 71 [2023-12-02 17:36:58,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:36:58,911 INFO L495 AbstractCegarLoop]: Abstraction has 877 states and 1292 transitions. [2023-12-02 17:36:58,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2023-12-02 17:36:58,912 INFO L276 IsEmpty]: Start isEmpty. Operand 877 states and 1292 transitions. [2023-12-02 17:36:58,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-12-02 17:36:58,913 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:36:58,913 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:36:58,919 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 17:36:59,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:36:59,116 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:36:59,116 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:36:59,116 INFO L85 PathProgramCache]: Analyzing trace with hash 951211296, now seen corresponding path program 1 times [2023-12-02 17:36:59,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:36:59,117 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306063901] [2023-12-02 17:36:59,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:36:59,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:36:59,125 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:36:59,126 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [513987467] [2023-12-02 17:36:59,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:36:59,126 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:36:59,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:36:59,127 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:36:59,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 17:36:59,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:36:59,190 INFO L262 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 17:36:59,193 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:37:00,078 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 26 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2023-12-02 17:37:00,078 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:37:01,718 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 23 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2023-12-02 17:37:01,719 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:37:01,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306063901] [2023-12-02 17:37:01,719 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:37:01,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [513987467] [2023-12-02 17:37:01,719 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [513987467] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:37:01,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [302377561] [2023-12-02 17:37:01,721 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:37:01,721 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:37:01,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:37:01,721 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:37:01,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:37:13,583 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 17:37:13,587 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:37:13,588 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:37:17,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15802#(and (<= ~counter~0 10) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:37:17,600 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:37:17,600 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:37:17,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 21 [2023-12-02 17:37:17,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359728534] [2023-12-02 17:37:17,600 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:37:17,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 17:37:17,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:37:17,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 17:37:17,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1423, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 17:37:17,603 INFO L87 Difference]: Start difference. First operand 877 states and 1292 transitions. Second operand has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2023-12-02 17:37:26,340 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 [] [2023-12-02 17:37:43,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:37:43,992 INFO L93 Difference]: Finished difference Result 1025 states and 1528 transitions. [2023-12-02 17:37:43,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 17:37:43,993 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) Word has length 88 [2023-12-02 17:37:43,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:37:43,998 INFO L225 Difference]: With dead ends: 1025 [2023-12-02 17:37:43,998 INFO L226 Difference]: Without dead ends: 1023 [2023-12-02 17:37:44,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 223 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1031 ImplicationChecksByTransitivity, 26.3s TimeCoverageRelationStatistics Valid=517, Invalid=2904, Unknown=1, NotChecked=0, Total=3422 [2023-12-02 17:37:44,001 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 146 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 98 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:37:44,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 349 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 385 Invalid, 1 Unknown, 0 Unchecked, 4.4s Time] [2023-12-02 17:37:44,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1023 states. [2023-12-02 17:37:44,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1023 to 981. [2023-12-02 17:37:44,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 981 states, 629 states have (on average 1.354531001589825) internal successors, (852), 651 states have internal predecessors, (852), 307 states have call successors, (307), 44 states have call predecessors, (307), 44 states have return successors, (305), 285 states have call predecessors, (305), 305 states have call successors, (305) [2023-12-02 17:37:44,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 981 states to 981 states and 1464 transitions. [2023-12-02 17:37:44,569 INFO L78 Accepts]: Start accepts. Automaton has 981 states and 1464 transitions. Word has length 88 [2023-12-02 17:37:44,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:37:44,569 INFO L495 AbstractCegarLoop]: Abstraction has 981 states and 1464 transitions. [2023-12-02 17:37:44,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2023-12-02 17:37:44,570 INFO L276 IsEmpty]: Start isEmpty. Operand 981 states and 1464 transitions. [2023-12-02 17:37:44,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-12-02 17:37:44,571 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:37:44,571 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:37:44,576 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 17:37:44,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 17:37:44,772 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:37:44,772 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:37:44,772 INFO L85 PathProgramCache]: Analyzing trace with hash 1729594626, now seen corresponding path program 4 times [2023-12-02 17:37:44,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:37:44,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141804808] [2023-12-02 17:37:44,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:37:44,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:37:44,779 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:37:44,779 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [444582973] [2023-12-02 17:37:44,779 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:37:44,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:37:44,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:37:44,780 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:37:44,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 17:37:44,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:37:44,851 INFO L262 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 17:37:44,853 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:37:44,873 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 141 proven. 0 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2023-12-02 17:37:44,873 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:37:44,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:37:44,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141804808] [2023-12-02 17:37:44,874 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:37:44,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444582973] [2023-12-02 17:37:44,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444582973] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:37:44,874 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:37:44,874 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 17:37:44,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337620566] [2023-12-02 17:37:44,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:37:44,875 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 17:37:44,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:37:44,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 17:37:44,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:37:44,875 INFO L87 Difference]: Start difference. First operand 981 states and 1464 transitions. Second operand has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 17:37:45,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:37:45,401 INFO L93 Difference]: Finished difference Result 1605 states and 2474 transitions. [2023-12-02 17:37:45,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:37:45,402 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 92 [2023-12-02 17:37:45,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:37:45,408 INFO L225 Difference]: With dead ends: 1605 [2023-12-02 17:37:45,409 INFO L226 Difference]: Without dead ends: 944 [2023-12-02 17:37:45,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 17:37:45,412 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 13 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:37:45,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 165 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:37:45,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 944 states. [2023-12-02 17:37:45,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 944 to 789. [2023-12-02 17:37:45,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 789 states, 497 states have (on average 1.3199195171026157) internal successors, (656), 508 states have internal predecessors, (656), 247 states have call successors, (247), 44 states have call predecessors, (247), 44 states have return successors, (245), 236 states have call predecessors, (245), 245 states have call successors, (245) [2023-12-02 17:37:45,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 789 states to 789 states and 1148 transitions. [2023-12-02 17:37:45,814 INFO L78 Accepts]: Start accepts. Automaton has 789 states and 1148 transitions. Word has length 92 [2023-12-02 17:37:45,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:37:45,815 INFO L495 AbstractCegarLoop]: Abstraction has 789 states and 1148 transitions. [2023-12-02 17:37:45,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 17:37:45,815 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states and 1148 transitions. [2023-12-02 17:37:45,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-12-02 17:37:45,817 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:37:45,817 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:37:45,822 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 17:37:46,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 17:37:46,018 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:37:46,018 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:37:46,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1306465918, now seen corresponding path program 1 times [2023-12-02 17:37:46,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:37:46,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091643272] [2023-12-02 17:37:46,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:37:46,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:37:46,027 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:37:46,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1295979084] [2023-12-02 17:37:46,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:37:46,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:37:46,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:37:46,029 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:37:46,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 17:37:46,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:37:46,103 INFO L262 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 17:37:46,105 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:37:46,212 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 32 proven. 229 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-12-02 17:37:46,212 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:37:46,321 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 32 proven. 37 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-12-02 17:37:46,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:37:46,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091643272] [2023-12-02 17:37:46,321 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:37:46,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295979084] [2023-12-02 17:37:46,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295979084] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:37:46,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1070557871] [2023-12-02 17:37:46,323 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 17:37:46,323 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:37:46,323 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:37:46,323 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:37:46,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:37:57,375 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 17:37:57,377 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:37:57,378 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:37:58,757 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23442#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:37:58,757 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:37:58,758 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:37:58,758 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 14 [2023-12-02 17:37:58,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125410573] [2023-12-02 17:37:58,758 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:37:58,758 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 17:37:58,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:37:58,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 17:37:58,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=777, Unknown=0, NotChecked=0, Total=992 [2023-12-02 17:37:58,760 INFO L87 Difference]: Start difference. First operand 789 states and 1148 transitions. Second operand has 14 states, 14 states have (on average 4.357142857142857) internal successors, (61), 14 states have internal predecessors, (61), 8 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 7 states have call predecessors, (32), 7 states have call successors, (32) [2023-12-02 17:37:59,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:37:59,664 INFO L93 Difference]: Finished difference Result 1822 states and 2626 transitions. [2023-12-02 17:37:59,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-12-02 17:37:59,664 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.357142857142857) internal successors, (61), 14 states have internal predecessors, (61), 8 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 7 states have call predecessors, (32), 7 states have call successors, (32) Word has length 103 [2023-12-02 17:37:59,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:37:59,671 INFO L225 Difference]: With dead ends: 1822 [2023-12-02 17:37:59,671 INFO L226 Difference]: Without dead ends: 1310 [2023-12-02 17:37:59,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 273 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=309, Invalid=1251, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 17:37:59,674 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 105 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:37:59,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 214 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:37:59,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1310 states. [2023-12-02 17:38:00,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1310 to 1292. [2023-12-02 17:38:00,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1292 states, 825 states have (on average 1.2448484848484849) internal successors, (1027), 838 states have internal predecessors, (1027), 366 states have call successors, (366), 100 states have call predecessors, (366), 100 states have return successors, (361), 353 states have call predecessors, (361), 361 states have call successors, (361) [2023-12-02 17:38:00,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1292 states to 1292 states and 1754 transitions. [2023-12-02 17:38:00,243 INFO L78 Accepts]: Start accepts. Automaton has 1292 states and 1754 transitions. Word has length 103 [2023-12-02 17:38:00,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:38:00,243 INFO L495 AbstractCegarLoop]: Abstraction has 1292 states and 1754 transitions. [2023-12-02 17:38:00,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.357142857142857) internal successors, (61), 14 states have internal predecessors, (61), 8 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 7 states have call predecessors, (32), 7 states have call successors, (32) [2023-12-02 17:38:00,244 INFO L276 IsEmpty]: Start isEmpty. Operand 1292 states and 1754 transitions. [2023-12-02 17:38:00,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-12-02 17:38:00,246 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:38:00,246 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:38:00,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 17:38:00,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:38:00,446 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:38:00,447 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:38:00,447 INFO L85 PathProgramCache]: Analyzing trace with hash -186342166, now seen corresponding path program 2 times [2023-12-02 17:38:00,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:38:00,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516053014] [2023-12-02 17:38:00,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:38:00,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:38:00,455 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:38:00,455 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1431060281] [2023-12-02 17:38:00,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:38:00,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:38:00,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:38:00,456 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:38:00,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 17:38:00,552 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 17:38:00,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:38:00,554 INFO L262 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 63 conjunts are in the unsatisfiable core [2023-12-02 17:38:00,557 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:38:01,520 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 36 proven. 80 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2023-12-02 17:38:01,520 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:38:03,375 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:38:03,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516053014] [2023-12-02 17:38:03,375 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:38:03,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431060281] [2023-12-02 17:38:03,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431060281] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:38:03,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1438769492] [2023-12-02 17:38:03,377 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:38:03,377 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:38:03,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:38:03,377 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:38:03,378 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:38:15,106 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 17:38:15,109 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:38:15,110 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:38:18,801 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28705#(and (<= ~counter~0 10) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:38:18,801 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:38:18,801 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:38:18,801 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2023-12-02 17:38:18,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518553798] [2023-12-02 17:38:18,801 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 17:38:18,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 17:38:18,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:38:18,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 17:38:18,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=1901, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 17:38:18,804 INFO L87 Difference]: Start difference. First operand 1292 states and 1754 transitions. Second operand has 18 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2023-12-02 17:38:20,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:38:20,179 INFO L93 Difference]: Finished difference Result 1370 states and 1830 transitions. [2023-12-02 17:38:20,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 17:38:20,180 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) Word has length 110 [2023-12-02 17:38:20,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:38:20,186 INFO L225 Difference]: With dead ends: 1370 [2023-12-02 17:38:20,186 INFO L226 Difference]: Without dead ends: 1366 [2023-12-02 17:38:20,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=358, Invalid=2504, Unknown=0, NotChecked=0, Total=2862 [2023-12-02 17:38:20,188 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 72 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 574 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 378 SdHoareTripleChecker+Invalid, 611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 17:38:20,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 378 Invalid, 611 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 574 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 17:38:20,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1366 states. [2023-12-02 17:38:20,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1366 to 1362. [2023-12-02 17:38:20,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1362 states, 874 states have (on average 1.234553775743707) internal successors, (1079), 886 states have internal predecessors, (1079), 374 states have call successors, (374), 114 states have call predecessors, (374), 113 states have return successors, (369), 361 states have call predecessors, (369), 369 states have call successors, (369) [2023-12-02 17:38:20,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1362 states to 1362 states and 1822 transitions. [2023-12-02 17:38:20,772 INFO L78 Accepts]: Start accepts. Automaton has 1362 states and 1822 transitions. Word has length 110 [2023-12-02 17:38:20,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:38:20,772 INFO L495 AbstractCegarLoop]: Abstraction has 1362 states and 1822 transitions. [2023-12-02 17:38:20,772 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2023-12-02 17:38:20,773 INFO L276 IsEmpty]: Start isEmpty. Operand 1362 states and 1822 transitions. [2023-12-02 17:38:20,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2023-12-02 17:38:20,774 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:38:20,774 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:38:20,779 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 17:38:20,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:38:20,975 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:38:20,975 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:38:20,975 INFO L85 PathProgramCache]: Analyzing trace with hash -634736719, now seen corresponding path program 1 times [2023-12-02 17:38:20,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:38:20,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467219521] [2023-12-02 17:38:20,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:38:20,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:38:20,983 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:38:20,983 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [245576184] [2023-12-02 17:38:20,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:38:20,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:38:20,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:38:20,984 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:38:20,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 17:38:21,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:38:21,048 INFO L262 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 17:38:21,051 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:38:21,165 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 32 proven. 434 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2023-12-02 17:38:21,165 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:38:21,271 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 32 proven. 50 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2023-12-02 17:38:21,272 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:38:21,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467219521] [2023-12-02 17:38:21,272 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:38:21,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245576184] [2023-12-02 17:38:21,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245576184] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:38:21,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1886406813] [2023-12-02 17:38:21,274 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 17:38:21,274 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:38:21,274 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:38:21,274 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:38:21,274 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:38:32,646 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 17:38:32,649 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:38:32,650 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:38:34,607 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33509#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:38:34,607 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:38:34,608 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:38:34,608 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 14 [2023-12-02 17:38:34,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130003541] [2023-12-02 17:38:34,608 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:38:34,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 17:38:34,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:38:34,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 17:38:34,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=832, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 17:38:34,610 INFO L87 Difference]: Start difference. First operand 1362 states and 1822 transitions. Second operand has 14 states, 14 states have (on average 4.714285714285714) internal successors, (66), 14 states have internal predecessors, (66), 10 states have call successors, (41), 7 states have call predecessors, (41), 6 states have return successors, (40), 9 states have call predecessors, (40), 9 states have call successors, (40) [2023-12-02 17:38:35,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:38:35,479 INFO L93 Difference]: Finished difference Result 1406 states and 1868 transitions. [2023-12-02 17:38:35,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-12-02 17:38:35,480 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.714285714285714) internal successors, (66), 14 states have internal predecessors, (66), 10 states have call successors, (41), 7 states have call predecessors, (41), 6 states have return successors, (40), 9 states have call predecessors, (40), 9 states have call successors, (40) Word has length 120 [2023-12-02 17:38:35,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:38:35,486 INFO L225 Difference]: With dead ends: 1406 [2023-12-02 17:38:35,486 INFO L226 Difference]: Without dead ends: 1386 [2023-12-02 17:38:35,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 323 SyntacticMatches, 4 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=319, Invalid=1321, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 17:38:35,488 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 65 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:38:35,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 201 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:38:35,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1386 states. [2023-12-02 17:38:36,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1386 to 1380. [2023-12-02 17:38:36,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1380 states, 892 states have (on average 1.2152466367713004) internal successors, (1084), 904 states have internal predecessors, (1084), 374 states have call successors, (374), 114 states have call predecessors, (374), 113 states have return successors, (369), 361 states have call predecessors, (369), 369 states have call successors, (369) [2023-12-02 17:38:36,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1380 states to 1380 states and 1827 transitions. [2023-12-02 17:38:36,079 INFO L78 Accepts]: Start accepts. Automaton has 1380 states and 1827 transitions. Word has length 120 [2023-12-02 17:38:36,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:38:36,080 INFO L495 AbstractCegarLoop]: Abstraction has 1380 states and 1827 transitions. [2023-12-02 17:38:36,080 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.714285714285714) internal successors, (66), 14 states have internal predecessors, (66), 10 states have call successors, (41), 7 states have call predecessors, (41), 6 states have return successors, (40), 9 states have call predecessors, (40), 9 states have call successors, (40) [2023-12-02 17:38:36,080 INFO L276 IsEmpty]: Start isEmpty. Operand 1380 states and 1827 transitions. [2023-12-02 17:38:36,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-12-02 17:38:36,081 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:38:36,082 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:38:36,087 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 17:38:36,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:38:36,282 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:38:36,282 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:38:36,282 INFO L85 PathProgramCache]: Analyzing trace with hash 1791411503, now seen corresponding path program 2 times [2023-12-02 17:38:36,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:38:36,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020700965] [2023-12-02 17:38:36,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:38:36,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:38:36,292 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:38:36,292 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1405953057] [2023-12-02 17:38:36,292 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:38:36,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:38:36,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:38:36,293 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:38:36,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 17:38:36,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 17:38:36,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:38:36,363 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 61 conjunts are in the unsatisfiable core [2023-12-02 17:38:36,366 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:38:37,254 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 35 proven. 52 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2023-12-02 17:38:37,254 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:38:39,165 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 32 proven. 52 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2023-12-02 17:38:39,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:38:39,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020700965] [2023-12-02 17:38:39,166 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:38:39,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405953057] [2023-12-02 17:38:39,166 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405953057] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:38:39,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1827943183] [2023-12-02 17:38:39,167 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 17:38:39,167 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:38:39,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:38:39,167 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:38:39,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:38:50,778 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 17:38:50,780 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:38:50,781 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:38:57,835 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38406#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:38:57,835 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:38:57,835 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:38:57,836 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-12-02 17:38:57,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603421459] [2023-12-02 17:38:57,836 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:38:57,836 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 17:38:57,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:38:57,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 17:38:57,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1848, Unknown=1, NotChecked=0, Total=2070 [2023-12-02 17:38:57,838 INFO L87 Difference]: Start difference. First operand 1380 states and 1827 transitions. Second operand has 26 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 24 states have internal predecessors, (59), 13 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 17:39:08,702 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.23s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:39:22,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:39:22,031 INFO L93 Difference]: Finished difference Result 1824 states and 2527 transitions. [2023-12-02 17:39:22,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2023-12-02 17:39:22,032 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 24 states have internal predecessors, (59), 13 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) Word has length 121 [2023-12-02 17:39:22,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:39:22,042 INFO L225 Difference]: With dead ends: 1824 [2023-12-02 17:39:22,042 INFO L226 Difference]: Without dead ends: 1808 [2023-12-02 17:39:22,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2905 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=1308, Invalid=8591, Unknown=1, NotChecked=0, Total=9900 [2023-12-02 17:39:22,048 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 262 mSDsluCounter, 1003 mSDsCounter, 0 mSdLazyCounter, 875 mSolverCounterSat, 302 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 1092 SdHoareTripleChecker+Invalid, 1177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 302 IncrementalHoareTripleChecker+Valid, 875 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.5s IncrementalHoareTripleChecker+Time [2023-12-02 17:39:22,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [274 Valid, 1092 Invalid, 1177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [302 Valid, 875 Invalid, 0 Unknown, 0 Unchecked, 8.5s Time] [2023-12-02 17:39:22,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1808 states. [2023-12-02 17:39:22,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1808 to 1552. [2023-12-02 17:39:22,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1552 states, 993 states have (on average 1.2286002014098691) internal successors, (1220), 1005 states have internal predecessors, (1220), 438 states have call successors, (438), 121 states have call predecessors, (438), 120 states have return successors, (433), 425 states have call predecessors, (433), 433 states have call successors, (433) [2023-12-02 17:39:22,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1552 states to 1552 states and 2091 transitions. [2023-12-02 17:39:22,993 INFO L78 Accepts]: Start accepts. Automaton has 1552 states and 2091 transitions. Word has length 121 [2023-12-02 17:39:22,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:39:22,994 INFO L495 AbstractCegarLoop]: Abstraction has 1552 states and 2091 transitions. [2023-12-02 17:39:22,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 24 states have internal predecessors, (59), 13 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (38), 11 states have call predecessors, (38), 11 states have call successors, (38) [2023-12-02 17:39:22,994 INFO L276 IsEmpty]: Start isEmpty. Operand 1552 states and 2091 transitions. [2023-12-02 17:39:22,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2023-12-02 17:39:22,996 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:39:22,996 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:39:23,000 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 17:39:23,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:39:23,197 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:39:23,197 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:39:23,197 INFO L85 PathProgramCache]: Analyzing trace with hash 1226352354, now seen corresponding path program 3 times [2023-12-02 17:39:23,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:39:23,197 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902931681] [2023-12-02 17:39:23,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:39:23,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:39:23,205 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:39:23,205 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2001784994] [2023-12-02 17:39:23,205 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:39:23,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:39:23,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:39:23,206 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:39:23,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 17:39:23,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:39:23,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:39:23,286 INFO L262 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 59 conjunts are in the unsatisfiable core [2023-12-02 17:39:23,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:39:24,264 INFO L134 CoverageAnalysis]: Checked inductivity of 732 backedges. 36 proven. 75 refuted. 0 times theorem prover too weak. 621 trivial. 0 not checked. [2023-12-02 17:39:24,265 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:39:26,096 INFO L134 CoverageAnalysis]: Checked inductivity of 732 backedges. 43 proven. 65 refuted. 0 times theorem prover too weak. 624 trivial. 0 not checked. [2023-12-02 17:39:26,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:39:26,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902931681] [2023-12-02 17:39:26,097 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:39:26,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001784994] [2023-12-02 17:39:26,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001784994] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:39:26,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1542236004] [2023-12-02 17:39:26,098 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:39:26,098 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:39:26,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:39:26,098 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:39:26,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:39:37,412 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 17:39:37,415 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:39:37,416 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:39:40,992 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44387#(and (<= ~counter~0 10) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:39:40,992 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:39:40,992 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:39:40,992 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-12-02 17:39:40,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862031441] [2023-12-02 17:39:40,992 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:39:40,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 17:39:40,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:39:40,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 17:39:40,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1828, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 17:39:40,994 INFO L87 Difference]: Start difference. First operand 1552 states and 2091 transitions. Second operand has 26 states, 25 states have (on average 2.52) internal successors, (63), 23 states have internal predecessors, (63), 14 states have call successors, (45), 3 states have call predecessors, (45), 2 states have return successors, (44), 14 states have call predecessors, (44), 14 states have call successors, (44) [2023-12-02 17:40:07,636 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:40:14,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:40:14,681 INFO L93 Difference]: Finished difference Result 1852 states and 2527 transitions. [2023-12-02 17:40:14,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-12-02 17:40:14,681 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.52) internal successors, (63), 23 states have internal predecessors, (63), 14 states have call successors, (45), 3 states have call predecessors, (45), 2 states have return successors, (44), 14 states have call predecessors, (44), 14 states have call successors, (44) Word has length 133 [2023-12-02 17:40:14,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:40:14,689 INFO L225 Difference]: With dead ends: 1852 [2023-12-02 17:40:14,689 INFO L226 Difference]: Without dead ends: 1850 [2023-12-02 17:40:14,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 353 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2795 ImplicationChecksByTransitivity, 29.4s TimeCoverageRelationStatistics Valid=1322, Invalid=7234, Unknown=0, NotChecked=0, Total=8556 [2023-12-02 17:40:14,692 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 255 mSDsluCounter, 718 mSDsCounter, 0 mSdLazyCounter, 727 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 784 SdHoareTripleChecker+Invalid, 964 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:40:14,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 784 Invalid, 964 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 727 Invalid, 0 Unknown, 0 Unchecked, 8.0s Time] [2023-12-02 17:40:14,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1850 states. [2023-12-02 17:40:15,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1850 to 1770. [2023-12-02 17:40:15,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1770 states, 1130 states have (on average 1.2415929203539824) internal successors, (1403), 1143 states have internal predecessors, (1403), 504 states have call successors, (504), 136 states have call predecessors, (504), 135 states have return successors, (499), 490 states have call predecessors, (499), 499 states have call successors, (499) [2023-12-02 17:40:15,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1770 states to 1770 states and 2406 transitions. [2023-12-02 17:40:15,763 INFO L78 Accepts]: Start accepts. Automaton has 1770 states and 2406 transitions. Word has length 133 [2023-12-02 17:40:15,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:40:15,764 INFO L495 AbstractCegarLoop]: Abstraction has 1770 states and 2406 transitions. [2023-12-02 17:40:15,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.52) internal successors, (63), 23 states have internal predecessors, (63), 14 states have call successors, (45), 3 states have call predecessors, (45), 2 states have return successors, (44), 14 states have call predecessors, (44), 14 states have call successors, (44) [2023-12-02 17:40:15,764 INFO L276 IsEmpty]: Start isEmpty. Operand 1770 states and 2406 transitions. [2023-12-02 17:40:15,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 17:40:15,765 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:40:15,766 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:40:15,770 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 17:40:15,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:40:15,966 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:40:15,966 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:40:15,967 INFO L85 PathProgramCache]: Analyzing trace with hash -505343358, now seen corresponding path program 4 times [2023-12-02 17:40:15,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:40:15,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160549602] [2023-12-02 17:40:15,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:40:15,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:40:15,975 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:40:15,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1476285398] [2023-12-02 17:40:15,976 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:40:15,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:40:15,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:40:15,977 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:40:15,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 17:40:16,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:40:16,068 INFO L262 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 68 conjunts are in the unsatisfiable core [2023-12-02 17:40:16,071 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:40:17,869 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 91 proven. 80 refuted. 0 times theorem prover too weak. 639 trivial. 0 not checked. [2023-12-02 17:40:17,869 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:40:23,932 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 91 proven. 76 refuted. 1 times theorem prover too weak. 642 trivial. 0 not checked. [2023-12-02 17:40:23,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:40:23,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160549602] [2023-12-02 17:40:23,932 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:40:23,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476285398] [2023-12-02 17:40:23,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1476285398] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:40:23,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1324255407] [2023-12-02 17:40:23,934 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:40:23,934 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:40:23,934 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:40:23,934 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:40:23,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:40:36,160 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 17:40:36,164 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:40:36,165 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:40:44,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50741#(and (<= ~counter~0 10) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:40:44,654 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:40:44,655 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:40:44,655 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 29 [2023-12-02 17:40:44,655 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668207414] [2023-12-02 17:40:44,655 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:40:44,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 17:40:44,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:40:44,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 17:40:44,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=2039, Unknown=2, NotChecked=0, Total=2352 [2023-12-02 17:40:44,657 INFO L87 Difference]: Start difference. First operand 1770 states and 2406 transitions. Second operand has 29 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) [2023-12-02 17:41:09,658 WARN L293 SmtUtils]: Spent 18.34s on a formula simplification that was a NOOP. DAG size: 104 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:41:22,180 WARN L293 SmtUtils]: Spent 9.35s on a formula simplification that was a NOOP. DAG size: 86 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:41:39,473 WARN L293 SmtUtils]: Spent 15.15s on a formula simplification that was a NOOP. DAG size: 121 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:41:42,456 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.53s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:41:44,897 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:41:46,900 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:42:30,074 WARN L293 SmtUtils]: Spent 40.42s on a formula simplification that was a NOOP. DAG size: 105 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:42:32,366 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:42:33,408 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:42:47,886 WARN L293 SmtUtils]: Spent 12.93s on a formula simplification that was a NOOP. DAG size: 103 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:42:59,401 WARN L293 SmtUtils]: Spent 6.62s on a formula simplification that was a NOOP. DAG size: 85 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:43:00,506 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:04,503 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:06,776 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:08,783 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:10,804 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:14,041 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:15,957 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:18,239 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:32,146 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:37,027 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:39,031 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:43:57,454 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:44:01,106 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:44:03,253 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:44:06,580 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:44:09,228 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:44:14,366 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:44:26,369 WARN L293 SmtUtils]: Spent 11.42s on a formula simplification that was a NOOP. DAG size: 102 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:44:28,393 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 [] [2023-12-02 17:44:34,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:44:34,319 INFO L93 Difference]: Finished difference Result 2135 states and 2980 transitions. [2023-12-02 17:44:34,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-12-02 17:44:34,320 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) Word has length 138 [2023-12-02 17:44:34,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:44:34,329 INFO L225 Difference]: With dead ends: 2135 [2023-12-02 17:44:34,329 INFO L226 Difference]: Without dead ends: 2131 [2023-12-02 17:44:34,331 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2011 ImplicationChecksByTransitivity, 184.9s TimeCoverageRelationStatistics Valid=1084, Invalid=5227, Unknown=9, NotChecked=0, Total=6320 [2023-12-02 17:44:34,332 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 266 mSDsluCounter, 751 mSDsCounter, 0 mSdLazyCounter, 852 mSolverCounterSat, 218 mSolverCounterUnsat, 18 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 55.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 803 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 852 IncrementalHoareTripleChecker+Invalid, 18 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 55.6s IncrementalHoareTripleChecker+Time [2023-12-02 17:44:34,332 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 803 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 852 Invalid, 18 Unknown, 0 Unchecked, 55.6s Time] [2023-12-02 17:44:34,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2131 states. [2023-12-02 17:44:36,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2131 to 2046. [2023-12-02 17:44:36,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2046 states, 1294 states have (on average 1.2627511591962906) internal successors, (1634), 1311 states have internal predecessors, (1634), 611 states have call successors, (611), 141 states have call predecessors, (611), 140 states have return successors, (607), 593 states have call predecessors, (607), 607 states have call successors, (607) [2023-12-02 17:44:36,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2046 states to 2046 states and 2852 transitions. [2023-12-02 17:44:36,505 INFO L78 Accepts]: Start accepts. Automaton has 2046 states and 2852 transitions. Word has length 138 [2023-12-02 17:44:36,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:44:36,505 INFO L495 AbstractCegarLoop]: Abstraction has 2046 states and 2852 transitions. [2023-12-02 17:44:36,506 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 15 states have call successors, (47), 3 states have call predecessors, (47), 3 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) [2023-12-02 17:44:36,506 INFO L276 IsEmpty]: Start isEmpty. Operand 2046 states and 2852 transitions. [2023-12-02 17:44:36,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-12-02 17:44:36,507 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:44:36,507 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:44:36,512 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 17:44:36,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:36,708 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:44:36,708 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:44:36,708 INFO L85 PathProgramCache]: Analyzing trace with hash -1548326695, now seen corresponding path program 3 times [2023-12-02 17:44:36,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:44:36,708 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817423145] [2023-12-02 17:44:36,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:44:36,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:44:36,719 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:44:36,720 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1442159285] [2023-12-02 17:44:36,720 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:44:36,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:44:36,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:44:36,721 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:44:36,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 17:44:36,796 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:44:36,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:44:36,798 INFO L262 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 17:44:36,802 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:44:37,763 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 40 proven. 76 refuted. 0 times theorem prover too weak. 769 trivial. 0 not checked. [2023-12-02 17:44:37,763 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:44:39,792 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 40 proven. 73 refuted. 0 times theorem prover too weak. 772 trivial. 0 not checked. [2023-12-02 17:44:39,792 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:44:39,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817423145] [2023-12-02 17:44:39,793 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:44:39,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442159285] [2023-12-02 17:44:39,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1442159285] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:44:39,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1669275680] [2023-12-02 17:44:39,794 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 17:44:39,794 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:44:39,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:44:39,794 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:44:39,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:44:51,081 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-12-02 17:44:51,084 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:44:51,085 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:44:56,363 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57952#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:44:56,363 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:44:56,363 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:44:56,363 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-12-02 17:44:56,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503226353] [2023-12-02 17:44:56,363 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:44:56,364 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 17:44:56,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:44:56,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 17:44:56,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1834, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 17:44:56,365 INFO L87 Difference]: Start difference. First operand 2046 states and 2852 transitions. Second operand has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2023-12-02 17:45:37,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:45:37,109 INFO L93 Difference]: Finished difference Result 2150 states and 3010 transitions. [2023-12-02 17:45:37,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-12-02 17:45:37,110 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) Word has length 140 [2023-12-02 17:45:37,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:45:37,122 INFO L225 Difference]: With dead ends: 2150 [2023-12-02 17:45:37,122 INFO L226 Difference]: Without dead ends: 2134 [2023-12-02 17:45:37,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 374 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1977 ImplicationChecksByTransitivity, 32.8s TimeCoverageRelationStatistics Valid=973, Invalid=6167, Unknown=0, NotChecked=0, Total=7140 [2023-12-02 17:45:37,124 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 236 mSDsluCounter, 1248 mSDsCounter, 0 mSdLazyCounter, 1165 mSolverCounterSat, 261 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 1352 SdHoareTripleChecker+Invalid, 1426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 261 IncrementalHoareTripleChecker+Valid, 1165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.6s IncrementalHoareTripleChecker+Time [2023-12-02 17:45:37,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [240 Valid, 1352 Invalid, 1426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [261 Valid, 1165 Invalid, 0 Unknown, 0 Unchecked, 12.6s Time] [2023-12-02 17:45:37,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2134 states. [2023-12-02 17:45:39,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2134 to 2108. [2023-12-02 17:45:39,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2108 states, 1323 states have (on average 1.2653061224489797) internal successors, (1674), 1340 states have internal predecessors, (1674), 642 states have call successors, (642), 142 states have call predecessors, (642), 142 states have return successors, (639), 625 states have call predecessors, (639), 639 states have call successors, (639) [2023-12-02 17:45:39,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2108 states to 2108 states and 2955 transitions. [2023-12-02 17:45:39,212 INFO L78 Accepts]: Start accepts. Automaton has 2108 states and 2955 transitions. Word has length 140 [2023-12-02 17:45:39,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:45:39,212 INFO L495 AbstractCegarLoop]: Abstraction has 2108 states and 2955 transitions. [2023-12-02 17:45:39,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2023-12-02 17:45:39,213 INFO L276 IsEmpty]: Start isEmpty. Operand 2108 states and 2955 transitions. [2023-12-02 17:45:39,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 17:45:39,215 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:45:39,215 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:45:39,220 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 17:45:39,415 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:45:39,416 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:45:39,416 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:45:39,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1551225450, now seen corresponding path program 5 times [2023-12-02 17:45:39,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:45:39,416 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813265830] [2023-12-02 17:45:39,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:45:39,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:45:39,425 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:45:39,425 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1658382533] [2023-12-02 17:45:39,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:45:39,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:45:39,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:45:39,426 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:45:39,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 17:45:39,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 17:45:39,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:45:39,521 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 65 conjunts are in the unsatisfiable core [2023-12-02 17:45:39,524 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:45:40,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1085 backedges. 153 proven. 89 refuted. 0 times theorem prover too weak. 843 trivial. 0 not checked. [2023-12-02 17:45:40,093 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:45:40,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:45:40,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813265830] [2023-12-02 17:45:40,165 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:45:40,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658382533] [2023-12-02 17:45:40,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658382533] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:45:40,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [870765135] [2023-12-02 17:45:40,167 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:45:40,167 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:45:40,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:45:40,167 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:45:40,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:45:52,714 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 17:45:52,717 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:45:52,718 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:45:55,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '64943#(and (<= ~counter~0 10) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:45:55,516 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:45:55,517 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:45:55,517 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2023-12-02 17:45:55,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707706168] [2023-12-02 17:45:55,517 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 17:45:55,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 17:45:55,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:45:55,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 17:45:55,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1095, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 17:45:55,518 INFO L87 Difference]: Start difference. First operand 2108 states and 2955 transitions. Second operand has 13 states, 11 states have (on average 3.0) internal successors, (33), 11 states have internal predecessors, (33), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (18), 7 states have call predecessors, (18), 6 states have call successors, (18) [2023-12-02 17:45:57,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:45:57,897 INFO L93 Difference]: Finished difference Result 2168 states and 3027 transitions. [2023-12-02 17:45:57,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 17:45:57,898 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.0) internal successors, (33), 11 states have internal predecessors, (33), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (18), 7 states have call predecessors, (18), 6 states have call successors, (18) Word has length 156 [2023-12-02 17:45:57,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:45:57,907 INFO L225 Difference]: With dead ends: 2168 [2023-12-02 17:45:57,907 INFO L226 Difference]: Without dead ends: 2164 [2023-12-02 17:45:57,908 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=193, Invalid=1367, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 17:45:57,908 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 34 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:45:57,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 325 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:45:57,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2164 states. [2023-12-02 17:46:00,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2164 to 2156. [2023-12-02 17:46:00,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2156 states, 1353 states have (on average 1.263118994826312) internal successors, (1709), 1368 states have internal predecessors, (1709), 654 states have call successors, (654), 149 states have call predecessors, (654), 148 states have return successors, (651), 638 states have call predecessors, (651), 651 states have call successors, (651) [2023-12-02 17:46:00,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2156 states to 2156 states and 3014 transitions. [2023-12-02 17:46:00,009 INFO L78 Accepts]: Start accepts. Automaton has 2156 states and 3014 transitions. Word has length 156 [2023-12-02 17:46:00,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:00,010 INFO L495 AbstractCegarLoop]: Abstraction has 2156 states and 3014 transitions. [2023-12-02 17:46:00,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.0) internal successors, (33), 11 states have internal predecessors, (33), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (18), 7 states have call predecessors, (18), 6 states have call successors, (18) [2023-12-02 17:46:00,010 INFO L276 IsEmpty]: Start isEmpty. Operand 2156 states and 3014 transitions. [2023-12-02 17:46:00,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2023-12-02 17:46:00,012 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:00,012 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:46:00,016 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 17:46:00,212 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 17:46:00,213 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:46:00,213 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:00,213 INFO L85 PathProgramCache]: Analyzing trace with hash -2043533228, now seen corresponding path program 6 times [2023-12-02 17:46:00,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:00,213 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [393748018] [2023-12-02 17:46:00,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:00,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:00,223 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 17:46:00,224 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1126616645] [2023-12-02 17:46:00,224 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:46:00,224 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:00,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:00,225 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:00,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7edc7e66-d980-4193-9a62-0580cc497b03/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 17:46:00,335 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:46:00,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:46:00,339 INFO L262 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 99 conjunts are in the unsatisfiable core [2023-12-02 17:46:00,342 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:02,697 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 217 proven. 133 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2023-12-02 17:46:02,697 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:30,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 224 proven. 109 refuted. 14 times theorem prover too weak. 844 trivial. 0 not checked. [2023-12-02 17:46:30,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:30,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [393748018] [2023-12-02 17:46:30,676 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 17:46:30,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126616645] [2023-12-02 17:46:30,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126616645] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:30,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [840263136] [2023-12-02 17:46:30,678 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 17:46:30,678 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:30,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:30,678 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:30,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:42,250 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 17:46:42,254 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-12-02 17:46:42,255 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:08,469 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '72482#(and (<= ~counter~0 10) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 17:47:08,470 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:08,470 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 17:47:08,470 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 36 [2023-12-02 17:47:08,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019931969] [2023-12-02 17:47:08,470 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:08,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 17:47:08,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:08,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 17:47:08,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=429, Invalid=2644, Unknown=7, NotChecked=0, Total=3080 [2023-12-02 17:47:08,472 INFO L87 Difference]: Start difference. First operand 2156 states and 3014 transitions. Second operand has 36 states, 32 states have (on average 2.5625) internal successors, (82), 30 states have internal predecessors, (82), 20 states have call successors, (55), 3 states have call predecessors, (55), 3 states have return successors, (54), 20 states have call predecessors, (54), 19 states have call successors, (54) [2023-12-02 17:47:09,970 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.49s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:14,028 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:16,047 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:21,353 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:30,318 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:37,113 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:39,817 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:42,042 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:48,637 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:50,641 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:47:52,662 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:48:02,388 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:48:04,391 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:48:06,393 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:48:15,745 WARN L293 SmtUtils]: Spent 7.61s on a formula simplification. DAG size of input: 140 DAG size of output: 103 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:48:38,312 WARN L293 SmtUtils]: Spent 21.67s on a formula simplification. DAG size of input: 143 DAG size of output: 121 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 17:48:40,583 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:48:43,977 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:48:46,292 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:48:50,062 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:48:52,249 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:00,593 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:02,599 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:04,605 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:06,606 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:08,611 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:10,619 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:18,073 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:21,428 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.36s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:23,481 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:25,786 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:27,791 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:29,793 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:31,797 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 17:49:33,802 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []