./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b 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_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS --witnessprinter.witness.filename witness.graphml --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 ca2134f8a32f49a0943527ee47fd89b4eb01286294fd09a8197c7c707de74c1d --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-8393723 [2022-11-19 08:04:01,934 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 08:04:01,937 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 08:04:01,982 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 08:04:01,985 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 08:04:01,990 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 08:04:01,994 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 08:04:02,004 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 08:04:02,010 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 08:04:02,012 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 08:04:02,014 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 08:04:02,016 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 08:04:02,017 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 08:04:02,021 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 08:04:02,024 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 08:04:02,025 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 08:04:02,028 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 08:04:02,037 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 08:04:02,039 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 08:04:02,041 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 08:04:02,047 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 08:04:02,049 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 08:04:02,050 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 08:04:02,052 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 08:04:02,058 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 08:04:02,059 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 08:04:02,064 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 08:04:02,066 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 08:04:02,068 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 08:04:02,069 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 08:04:02,069 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 08:04:02,070 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 08:04:02,072 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 08:04:02,073 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 08:04:02,075 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 08:04:02,076 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 08:04:02,077 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 08:04:02,077 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 08:04:02,078 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 08:04:02,079 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 08:04:02,080 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 08:04:02,081 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 08:04:02,119 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 08:04:02,119 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 08:04:02,119 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 08:04:02,120 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 08:04:02,120 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 08:04:02,121 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 08:04:02,121 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 08:04:02,121 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 08:04:02,121 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 08:04:02,122 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 08:04:02,122 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 08:04:02,122 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 08:04:02,122 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 08:04:02,123 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 08:04:02,123 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 08:04:02,123 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 08:04:02,123 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 08:04:02,123 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 08:04:02,124 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 08:04:02,124 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 08:04:02,125 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 08:04:02,125 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 08:04:02,125 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 08:04:02,125 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 08:04:02,126 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 08:04:02,126 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 08:04:02,126 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 08:04:02,126 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 08:04:02,127 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 08:04:02,127 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 08:04:02,127 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 08:04:02,127 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 08:04:02,127 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:04:02,128 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 08:04:02,128 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 08:04:02,128 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 08:04:02,128 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 08:04:02,129 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 08:04:02,129 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 08:04:02,129 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 08:04:02,129 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 08:04:02,130 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca2134f8a32f49a0943527ee47fd89b4eb01286294fd09a8197c7c707de74c1d [2022-11-19 08:04:02,472 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 08:04:02,498 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 08:04:02,501 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 08:04:02,502 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 08:04:02,503 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 08:04:02,505 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c [2022-11-19 08:04:02,576 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/data/2ae1bdcef/cda12c5e49984700a0826921c294c290/FLAGca1ac253c [2022-11-19 08:04:03,160 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 08:04:03,160 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c [2022-11-19 08:04:03,168 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/data/2ae1bdcef/cda12c5e49984700a0826921c294c290/FLAGca1ac253c [2022-11-19 08:04:03,537 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/data/2ae1bdcef/cda12c5e49984700a0826921c294c290 [2022-11-19 08:04:03,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 08:04:03,542 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 08:04:03,544 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 08:04:03,544 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 08:04:03,549 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 08:04:03,550 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,551 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1021392a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03, skipping insertion in model container [2022-11-19 08:04:03,552 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,561 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 08:04:03,577 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 08:04:03,809 WARN L234 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_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c[535,548] [2022-11-19 08:04:03,872 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:04:03,885 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 08:04:03,898 WARN L234 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_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c[535,548] [2022-11-19 08:04:03,912 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:04:03,927 INFO L208 MainTranslator]: Completed translation [2022-11-19 08:04:03,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03 WrapperNode [2022-11-19 08:04:03,928 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 08:04:03,929 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 08:04:03,929 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 08:04:03,929 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 08:04:03,938 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,945 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,966 INFO L138 Inliner]: procedures = 14, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2022-11-19 08:04:03,967 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 08:04:03,968 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 08:04:03,968 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 08:04:03,968 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 08:04:03,979 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,979 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,981 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,981 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,985 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,990 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,992 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,993 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:03,995 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 08:04:03,996 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 08:04:03,996 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 08:04:03,996 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 08:04:03,997 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (1/1) ... [2022-11-19 08:04:04,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:04:04,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:04,057 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 08:04:04,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 08:04:04,120 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 08:04:04,120 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-19 08:04:04,120 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-19 08:04:04,121 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 08:04:04,121 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 08:04:04,121 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 08:04:04,122 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-19 08:04:04,122 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-19 08:04:04,219 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 08:04:04,223 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 08:04:04,475 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 08:04:04,511 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 08:04:04,511 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-19 08:04:04,514 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:04:04 BoogieIcfgContainer [2022-11-19 08:04:04,526 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 08:04:04,529 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 08:04:04,529 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 08:04:04,535 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 08:04:04,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 08:04:03" (1/3) ... [2022-11-19 08:04:04,536 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9c45fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:04:04, skipping insertion in model container [2022-11-19 08:04:04,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:04:03" (2/3) ... [2022-11-19 08:04:04,551 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9c45fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:04:04, skipping insertion in model container [2022-11-19 08:04:04,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:04:04" (3/3) ... [2022-11-19 08:04:04,553 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound50.c [2022-11-19 08:04:04,577 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 08:04:04,578 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 08:04:04,640 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 08:04:04,649 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=LoopsAndPotentialCycles, 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;@20686408, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 08:04:04,649 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 08:04:04,654 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-19 08:04:04,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-19 08:04:04,665 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:04,666 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:04,678 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:04,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:04,686 INFO L85 PathProgramCache]: Analyzing trace with hash -438729207, now seen corresponding path program 1 times [2022-11-19 08:04:04,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:04,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529378868] [2022-11-19 08:04:04,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:04,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:04,863 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:04,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1707081846] [2022-11-19 08:04:04,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:04,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:04,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:04,869 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:04,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 08:04:04,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:04,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-19 08:04:04,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:05,004 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:04:05,004 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:04:05,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:05,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529378868] [2022-11-19 08:04:05,005 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:05,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707081846] [2022-11-19 08:04:05,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707081846] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:04:05,007 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:04:05,007 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 08:04:05,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697886350] [2022-11-19 08:04:05,013 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:04:05,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-19 08:04:05,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:05,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-19 08:04:05,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 08:04:05,085 INFO L87 Difference]: Start difference. First operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-19 08:04:05,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:05,146 INFO L93 Difference]: Finished difference Result 48 states and 77 transitions. [2022-11-19 08:04:05,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-19 08:04:05,150 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-11-19 08:04:05,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:05,158 INFO L225 Difference]: With dead ends: 48 [2022-11-19 08:04:05,159 INFO L226 Difference]: Without dead ends: 25 [2022-11-19 08:04:05,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 08:04:05,167 INFO L413 NwaCegarLoop]: 33 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, 33 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 [2022-11-19 08:04:05,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:04:05,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-19 08:04:05,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-19 08:04:05,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-19 08:04:05,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2022-11-19 08:04:05,211 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 13 [2022-11-19 08:04:05,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:05,213 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2022-11-19 08:04:05,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-19 08:04:05,214 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2022-11-19 08:04:05,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 08:04:05,215 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:05,216 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:05,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:05,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-19 08:04:05,423 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:05,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:05,424 INFO L85 PathProgramCache]: Analyzing trace with hash 2071776720, now seen corresponding path program 1 times [2022-11-19 08:04:05,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:05,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276997856] [2022-11-19 08:04:05,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:05,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:05,443 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:05,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1817539223] [2022-11-19 08:04:05,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:05,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:05,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:05,456 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:05,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 08:04:05,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:05,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 08:04:05,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:05,621 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:04:05,621 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:04:05,621 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:05,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276997856] [2022-11-19 08:04:05,639 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:05,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817539223] [2022-11-19 08:04:05,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1817539223] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:04:05,640 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:04:05,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:04:05,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895181601] [2022-11-19 08:04:05,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:04:05,642 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 08:04:05,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:05,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 08:04:05,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:04:05,643 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-19 08:04:05,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:05,741 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-11-19 08:04:05,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 08:04:05,743 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-19 08:04:05,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:05,745 INFO L225 Difference]: With dead ends: 34 [2022-11-19 08:04:05,745 INFO L226 Difference]: Without dead ends: 27 [2022-11-19 08:04:05,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:04:05,747 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:05,750 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 82 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:04:05,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-19 08:04:05,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-19 08:04:05,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-19 08:04:05,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2022-11-19 08:04:05,768 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 14 [2022-11-19 08:04:05,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:05,769 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2022-11-19 08:04:05,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-19 08:04:05,769 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2022-11-19 08:04:05,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 08:04:05,770 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:05,770 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:05,787 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-19 08:04:05,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-11-19 08:04:05,977 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:05,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:05,978 INFO L85 PathProgramCache]: Analyzing trace with hash 2073445016, now seen corresponding path program 1 times [2022-11-19 08:04:05,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:05,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836141958] [2022-11-19 08:04:05,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:05,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:06,015 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:06,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1842422479] [2022-11-19 08:04:06,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:06,016 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:06,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:06,019 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:06,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 08:04:06,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:06,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 08:04:06,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:06,273 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:04:06,274 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:04:06,274 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:06,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836141958] [2022-11-19 08:04:06,276 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:06,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842422479] [2022-11-19 08:04:06,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842422479] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:04:06,277 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:04:06,277 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 08:04:06,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492010463] [2022-11-19 08:04:06,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:04:06,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:04:06,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:06,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:04:06,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 08:04:06,281 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-19 08:04:10,983 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 [] [2022-11-19 08:04:12,956 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.73s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:04:12,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:12,999 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2022-11-19 08:04:13,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 08:04:13,001 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-19 08:04:13,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:13,002 INFO L225 Difference]: With dead ends: 46 [2022-11-19 08:04:13,002 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 08:04:13,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:04:13,004 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 16 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:13,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 81 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 1 Unknown, 0 Unchecked, 6.7s Time] [2022-11-19 08:04:13,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 08:04:13,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-19 08:04:13,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 31 states have internal predecessors, (43), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-19 08:04:13,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 60 transitions. [2022-11-19 08:04:13,046 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 60 transitions. Word has length 14 [2022-11-19 08:04:13,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:13,047 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 60 transitions. [2022-11-19 08:04:13,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-19 08:04:13,048 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 60 transitions. [2022-11-19 08:04:13,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-19 08:04:13,051 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:13,051 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:13,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:13,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:13,259 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:13,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:13,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1668710205, now seen corresponding path program 1 times [2022-11-19 08:04:13,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:13,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222488205] [2022-11-19 08:04:13,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:13,261 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:13,275 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:13,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [991810230] [2022-11-19 08:04:13,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:13,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:13,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:13,277 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:13,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 08:04:13,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:13,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 08:04:13,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:13,542 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:04:13,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:13,791 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:04:13,791 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:13,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222488205] [2022-11-19 08:04:13,791 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:13,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991810230] [2022-11-19 08:04:13,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [991810230] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:04:13,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1064075255] [2022-11-19 08:04:13,820 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 08:04:13,820 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:04:13,825 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:04:13,832 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:04:13,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:04:14,424 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-19 08:04:14,442 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:04:14,546 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:04:20,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1064075255] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:04:20,887 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:04:20,887 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 7] total 22 [2022-11-19 08:04:20,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029138225] [2022-11-19 08:04:20,888 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:04:20,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 08:04:20,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:20,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 08:04:20,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2022-11-19 08:04:20,891 INFO L87 Difference]: Start difference. First operand 43 states and 60 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-19 08:04:21,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:21,188 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2022-11-19 08:04:21,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 08:04:21,192 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2022-11-19 08:04:21,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:21,194 INFO L225 Difference]: With dead ends: 57 [2022-11-19 08:04:21,194 INFO L226 Difference]: Without dead ends: 50 [2022-11-19 08:04:21,195 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2022-11-19 08:04:21,196 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:21,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 109 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 105 Invalid, 0 Unknown, 18 Unchecked, 0.3s Time] [2022-11-19 08:04:21,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-19 08:04:21,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-11-19 08:04:21,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 35 states have internal predecessors, (47), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 08:04:21,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2022-11-19 08:04:21,221 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 20 [2022-11-19 08:04:21,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:21,222 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2022-11-19 08:04:21,222 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-19 08:04:21,222 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2022-11-19 08:04:21,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 08:04:21,224 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:21,224 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:21,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:21,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:21,431 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:21,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:21,432 INFO L85 PathProgramCache]: Analyzing trace with hash 1929295880, now seen corresponding path program 1 times [2022-11-19 08:04:21,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:21,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313328595] [2022-11-19 08:04:21,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:21,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:21,444 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:21,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [542704704] [2022-11-19 08:04:21,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:21,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:21,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:21,453 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:21,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 08:04:21,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:21,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-19 08:04:21,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:21,588 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:04:21,588 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:04:21,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:21,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313328595] [2022-11-19 08:04:21,589 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:21,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542704704] [2022-11-19 08:04:21,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542704704] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:04:21,589 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:04:21,590 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 08:04:21,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376114985] [2022-11-19 08:04:21,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:04:21,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:04:21,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:21,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:04:21,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 08:04:21,592 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-19 08:04:21,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:21,668 INFO L93 Difference]: Finished difference Result 86 states and 120 transitions. [2022-11-19 08:04:21,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 08:04:21,669 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2022-11-19 08:04:21,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:21,674 INFO L225 Difference]: With dead ends: 86 [2022-11-19 08:04:21,674 INFO L226 Difference]: Without dead ends: 51 [2022-11-19 08:04:21,676 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 [2022-11-19 08:04:21,679 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 2 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:21,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 87 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:04:21,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-19 08:04:21,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-11-19 08:04:21,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 37 states have internal predecessors, (49), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 08:04:21,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 68 transitions. [2022-11-19 08:04:21,713 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 68 transitions. Word has length 26 [2022-11-19 08:04:21,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:21,713 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 68 transitions. [2022-11-19 08:04:21,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-19 08:04:21,714 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 68 transitions. [2022-11-19 08:04:21,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-19 08:04:21,715 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:21,716 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:21,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:21,923 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:21,925 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:21,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:21,926 INFO L85 PathProgramCache]: Analyzing trace with hash 1808313670, now seen corresponding path program 1 times [2022-11-19 08:04:21,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:21,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464942562] [2022-11-19 08:04:21,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:21,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:21,946 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:21,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [699473855] [2022-11-19 08:04:21,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:21,946 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:21,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:21,952 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:21,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 08:04:22,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:22,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-19 08:04:22,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:22,290 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 08:04:22,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:22,465 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-19 08:04:22,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:22,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464942562] [2022-11-19 08:04:22,466 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:22,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699473855] [2022-11-19 08:04:22,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699473855] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:04:22,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [281141846] [2022-11-19 08:04:22,470 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-19 08:04:22,470 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:04:22,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:04:22,471 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:04:22,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:04:24,158 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 89 for LOIs [2022-11-19 08:04:24,333 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:04:24,381 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:04:42,005 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1226#(and (<= 2 ~counter~0) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-19 08:04:42,005 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:04:42,005 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:04:42,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 12 [2022-11-19 08:04:42,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815252814] [2022-11-19 08:04:42,006 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:04:42,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 08:04:42,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:42,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 08:04:42,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=656, Unknown=1, NotChecked=0, Total=756 [2022-11-19 08:04:42,009 INFO L87 Difference]: Start difference. First operand 51 states and 68 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-19 08:04:42,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:42,423 INFO L93 Difference]: Finished difference Result 71 states and 96 transitions. [2022-11-19 08:04:42,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 08:04:42,424 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 30 [2022-11-19 08:04:42,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:42,425 INFO L225 Difference]: With dead ends: 71 [2022-11-19 08:04:42,426 INFO L226 Difference]: Without dead ends: 67 [2022-11-19 08:04:42,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=116, Invalid=753, Unknown=1, NotChecked=0, Total=870 [2022-11-19 08:04:42,428 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 83 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:42,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 136 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:04:42,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-19 08:04:42,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 37. [2022-11-19 08:04:42,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 26 states have internal predecessors, (32), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-19 08:04:42,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2022-11-19 08:04:42,463 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 30 [2022-11-19 08:04:42,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:42,463 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2022-11-19 08:04:42,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-19 08:04:42,464 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2022-11-19 08:04:42,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-19 08:04:42,467 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:42,467 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:42,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:42,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 08:04:42,674 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:42,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:42,674 INFO L85 PathProgramCache]: Analyzing trace with hash -2135719167, now seen corresponding path program 1 times [2022-11-19 08:04:42,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:42,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854759788] [2022-11-19 08:04:42,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:42,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:42,697 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:42,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [986048118] [2022-11-19 08:04:42,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:42,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:42,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:42,704 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:42,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 08:04:42,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:42,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 08:04:42,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:42,858 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:04:42,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:42,949 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 08:04:42,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:42,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854759788] [2022-11-19 08:04:42,950 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:42,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986048118] [2022-11-19 08:04:42,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986048118] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-19 08:04:42,950 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:04:42,950 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 10 [2022-11-19 08:04:42,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855787569] [2022-11-19 08:04:42,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:04:42,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:04:42,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:42,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:04:42,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-19 08:04:42,952 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-19 08:04:43,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:43,027 INFO L93 Difference]: Finished difference Result 67 states and 84 transitions. [2022-11-19 08:04:43,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:04:43,028 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2022-11-19 08:04:43,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:43,029 INFO L225 Difference]: With dead ends: 67 [2022-11-19 08:04:43,029 INFO L226 Difference]: Without dead ends: 46 [2022-11-19 08:04:43,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-19 08:04:43,031 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 15 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:43,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 125 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:04:43,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-19 08:04:43,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2022-11-19 08:04:43,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-19 08:04:43,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-19 08:04:43,072 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 32 [2022-11-19 08:04:43,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:43,073 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-19 08:04:43,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-19 08:04:43,073 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-19 08:04:43,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-19 08:04:43,074 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:43,074 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:43,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:43,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-19 08:04:43,279 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:43,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:43,279 INFO L85 PathProgramCache]: Analyzing trace with hash -301470394, now seen corresponding path program 1 times [2022-11-19 08:04:43,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:43,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926278720] [2022-11-19 08:04:43,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:43,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:43,290 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:43,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [387109567] [2022-11-19 08:04:43,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:43,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:43,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:43,292 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:43,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 08:04:43,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:43,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 08:04:43,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:43,439 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:04:43,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:43,521 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 08:04:43,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:43,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926278720] [2022-11-19 08:04:43,521 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:43,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387109567] [2022-11-19 08:04:43,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387109567] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:04:43,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [56285350] [2022-11-19 08:04:43,525 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-19 08:04:43,525 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:04:43,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:04:43,526 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:04:43,526 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:04:46,126 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-19 08:04:46,136 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:04:46,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:04:57,587 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1965#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:04:57,588 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:04:57,588 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:04:57,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-11-19 08:04:57,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872631474] [2022-11-19 08:04:57,588 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:04:57,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-19 08:04:57,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:57,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-19 08:04:57,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=669, Unknown=0, NotChecked=0, Total=812 [2022-11-19 08:04:57,591 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-19 08:04:57,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:57,874 INFO L93 Difference]: Finished difference Result 122 states and 157 transitions. [2022-11-19 08:04:57,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 08:04:57,875 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 34 [2022-11-19 08:04:57,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:57,881 INFO L225 Difference]: With dead ends: 122 [2022-11-19 08:04:57,881 INFO L226 Difference]: Without dead ends: 101 [2022-11-19 08:04:57,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 08:04:57,883 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 71 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:57,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 207 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:04:57,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-19 08:04:57,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 88. [2022-11-19 08:04:57,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 64 states have (on average 1.28125) internal successors, (82), 65 states have internal predecessors, (82), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-19 08:04:57,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 113 transitions. [2022-11-19 08:04:57,936 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 113 transitions. Word has length 34 [2022-11-19 08:04:57,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:57,937 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 113 transitions. [2022-11-19 08:04:57,937 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-19 08:04:57,937 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 113 transitions. [2022-11-19 08:04:57,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-19 08:04:57,939 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:57,939 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 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, 1, 1] [2022-11-19 08:04:57,946 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-19 08:04:58,146 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:58,147 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:58,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:58,148 INFO L85 PathProgramCache]: Analyzing trace with hash 753982024, now seen corresponding path program 1 times [2022-11-19 08:04:58,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:58,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026326985] [2022-11-19 08:04:58,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:58,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:58,158 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:58,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [453968297] [2022-11-19 08:04:58,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:58,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:58,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:58,171 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:58,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 08:04:58,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:58,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 08:04:58,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:58,298 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-19 08:04:58,299 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:04:58,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:58,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026326985] [2022-11-19 08:04:58,299 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:58,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453968297] [2022-11-19 08:04:58,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453968297] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:04:58,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:04:58,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 08:04:58,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813692560] [2022-11-19 08:04:58,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:04:58,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 08:04:58,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:58,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 08:04:58,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:04:58,308 INFO L87 Difference]: Start difference. First operand 88 states and 113 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-19 08:04:58,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:58,408 INFO L93 Difference]: Finished difference Result 151 states and 201 transitions. [2022-11-19 08:04:58,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 08:04:58,409 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2022-11-19 08:04:58,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:58,413 INFO L225 Difference]: With dead ends: 151 [2022-11-19 08:04:58,413 INFO L226 Difference]: Without dead ends: 112 [2022-11-19 08:04:58,418 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:04:58,421 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 23 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:58,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 77 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:04:58,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-11-19 08:04:58,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2022-11-19 08:04:58,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 81 states have (on average 1.2839506172839505) internal successors, (104), 82 states have internal predecessors, (104), 21 states have call successors, (21), 8 states have call predecessors, (21), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-19 08:04:58,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 145 transitions. [2022-11-19 08:04:58,488 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 145 transitions. Word has length 38 [2022-11-19 08:04:58,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:58,488 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 145 transitions. [2022-11-19 08:04:58,489 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-19 08:04:58,489 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 145 transitions. [2022-11-19 08:04:58,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-19 08:04:58,490 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:58,490 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 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] [2022-11-19 08:04:58,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:58,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:58,697 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:58,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:58,698 INFO L85 PathProgramCache]: Analyzing trace with hash 419809677, now seen corresponding path program 1 times [2022-11-19 08:04:58,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:58,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004693245] [2022-11-19 08:04:58,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:58,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:58,706 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:58,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [491000056] [2022-11-19 08:04:58,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:58,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:58,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:58,708 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:58,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 08:04:58,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:58,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 08:04:58,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:58,887 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:04:58,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:59,016 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-19 08:04:59,017 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:59,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004693245] [2022-11-19 08:04:59,017 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:59,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491000056] [2022-11-19 08:04:59,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491000056] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:04:59,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [298348525] [2022-11-19 08:04:59,020 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:04:59,020 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:04:59,021 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:04:59,021 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:04:59,021 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:01,689 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 55 for LOIs [2022-11-19 08:05:01,728 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:05:01,784 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:05:18,680 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3031#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:05:18,681 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:05:18,681 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:05:18,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-19 08:05:18,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372726933] [2022-11-19 08:05:18,682 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:05:18,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 08:05:18,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:18,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 08:05:18,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2022-11-19 08:05:18,684 INFO L87 Difference]: Start difference. First operand 110 states and 145 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-19 08:05:19,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:19,124 INFO L93 Difference]: Finished difference Result 230 states and 311 transitions. [2022-11-19 08:05:19,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-19 08:05:19,125 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 40 [2022-11-19 08:05:19,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:19,128 INFO L225 Difference]: With dead ends: 230 [2022-11-19 08:05:19,128 INFO L226 Difference]: Without dead ends: 175 [2022-11-19 08:05:19,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=231, Invalid=1101, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 08:05:19,130 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 109 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:19,132 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 278 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:05:19,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-11-19 08:05:19,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 156. [2022-11-19 08:05:19,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 116 states have (on average 1.2844827586206897) internal successors, (149), 117 states have internal predecessors, (149), 30 states have call successors, (30), 10 states have call predecessors, (30), 9 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2022-11-19 08:05:19,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 208 transitions. [2022-11-19 08:05:19,218 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 208 transitions. Word has length 40 [2022-11-19 08:05:19,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:19,218 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 208 transitions. [2022-11-19 08:05:19,219 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-19 08:05:19,219 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 208 transitions. [2022-11-19 08:05:19,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-19 08:05:19,224 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:19,224 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:19,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:19,430 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 08:05:19,430 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:19,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:19,431 INFO L85 PathProgramCache]: Analyzing trace with hash -1579218988, now seen corresponding path program 1 times [2022-11-19 08:05:19,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:19,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665197798] [2022-11-19 08:05:19,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:19,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:19,439 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:05:19,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1217476097] [2022-11-19 08:05:19,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:19,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:19,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:19,442 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:19,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 08:05:19,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:19,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-19 08:05:19,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:19,608 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:05:19,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:19,754 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-19 08:05:19,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:19,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665197798] [2022-11-19 08:05:19,755 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:05:19,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217476097] [2022-11-19 08:05:19,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217476097] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:05:19,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1101695688] [2022-11-19 08:05:19,757 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:05:19,758 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:05:19,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:05:19,758 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:05:19,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:23,501 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-19 08:05:23,506 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:05:23,539 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:05:39,573 WARN L233 SmtUtils]: Spent 5.24s on a formula simplification. DAG size of input: 113 DAG size of output: 103 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:05:42,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3905#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:05:42,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:05:42,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:05:42,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-19 08:05:42,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299502349] [2022-11-19 08:05:42,247 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:05:42,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 08:05:42,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:42,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 08:05:42,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=937, Unknown=0, NotChecked=0, Total=1122 [2022-11-19 08:05:42,249 INFO L87 Difference]: Start difference. First operand 156 states and 208 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-19 08:05:42,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:42,774 INFO L93 Difference]: Finished difference Result 252 states and 333 transitions. [2022-11-19 08:05:42,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-19 08:05:42,775 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2022-11-19 08:05:42,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:42,777 INFO L225 Difference]: With dead ends: 252 [2022-11-19 08:05:42,777 INFO L226 Difference]: Without dead ends: 247 [2022-11-19 08:05:42,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=244, Invalid=1316, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 08:05:42,779 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 220 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:42,779 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 234 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:05:42,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2022-11-19 08:05:42,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 212. [2022-11-19 08:05:42,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 157 states have (on average 1.286624203821656) internal successors, (202), 162 states have internal predecessors, (202), 43 states have call successors, (43), 12 states have call predecessors, (43), 11 states have return successors, (42), 37 states have call predecessors, (42), 42 states have call successors, (42) [2022-11-19 08:05:42,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 287 transitions. [2022-11-19 08:05:42,867 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 287 transitions. Word has length 46 [2022-11-19 08:05:42,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:42,868 INFO L495 AbstractCegarLoop]: Abstraction has 212 states and 287 transitions. [2022-11-19 08:05:42,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-19 08:05:42,868 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 287 transitions. [2022-11-19 08:05:42,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-19 08:05:42,870 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:42,870 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 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] [2022-11-19 08:05:42,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:43,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-19 08:05:43,079 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:43,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:43,079 INFO L85 PathProgramCache]: Analyzing trace with hash -1252121023, now seen corresponding path program 1 times [2022-11-19 08:05:43,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:43,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788345712] [2022-11-19 08:05:43,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:43,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:43,090 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:05:43,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1034473311] [2022-11-19 08:05:43,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:43,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:43,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:43,092 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:43,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 08:05:43,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:43,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 08:05:43,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:43,487 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-19 08:05:43,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:43,930 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-19 08:05:43,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:43,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788345712] [2022-11-19 08:05:43,931 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:05:43,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034473311] [2022-11-19 08:05:43,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034473311] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:05:43,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [106027933] [2022-11-19 08:05:43,938 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:05:43,938 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:05:43,938 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:05:43,939 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:05:43,939 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:49,146 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-19 08:05:49,152 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:05:49,200 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:15,254 WARN L233 SmtUtils]: Spent 6.95s on a formula simplification. DAG size of input: 116 DAG size of output: 103 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:06:22,131 WARN L233 SmtUtils]: Spent 5.86s on a formula simplification. DAG size of input: 113 DAG size of output: 103 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:06:29,898 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4933#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:29,898 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:29,898 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:06:29,898 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2022-11-19 08:06:29,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38595411] [2022-11-19 08:06:29,898 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:29,899 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 08:06:29,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:29,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 08:06:29,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=930, Unknown=1, NotChecked=0, Total=1056 [2022-11-19 08:06:29,900 INFO L87 Difference]: Start difference. First operand 212 states and 287 transitions. Second operand has 13 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:06:31,976 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 [] [2022-11-19 08:06:34,077 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:06:36,411 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.08s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:06:36,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:36,555 INFO L93 Difference]: Finished difference Result 308 states and 423 transitions. [2022-11-19 08:06:36,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 08:06:36,557 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) Word has length 52 [2022-11-19 08:06:36,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:36,559 INFO L225 Difference]: With dead ends: 308 [2022-11-19 08:06:36,560 INFO L226 Difference]: Without dead ends: 218 [2022-11-19 08:06:36,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 120 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 41.0s TimeCoverageRelationStatistics Valid=141, Invalid=1048, Unknown=1, NotChecked=0, Total=1190 [2022-11-19 08:06:36,562 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 55 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 21 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:36,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 185 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 215 Invalid, 3 Unknown, 0 Unchecked, 6.5s Time] [2022-11-19 08:06:36,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2022-11-19 08:06:36,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 200. [2022-11-19 08:06:36,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 148 states have (on average 1.2297297297297298) internal successors, (182), 151 states have internal predecessors, (182), 40 states have call successors, (40), 12 states have call predecessors, (40), 11 states have return successors, (39), 36 states have call predecessors, (39), 39 states have call successors, (39) [2022-11-19 08:06:36,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 261 transitions. [2022-11-19 08:06:36,664 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 261 transitions. Word has length 52 [2022-11-19 08:06:36,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:36,665 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 261 transitions. [2022-11-19 08:06:36,665 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.75) internal successors, (33), 10 states have internal predecessors, (33), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:06:36,665 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 261 transitions. [2022-11-19 08:06:36,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 08:06:36,668 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:36,668 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:36,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-19 08:06:36,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:36,875 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:36,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:36,875 INFO L85 PathProgramCache]: Analyzing trace with hash -703296414, now seen corresponding path program 1 times [2022-11-19 08:06:36,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:36,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518335562] [2022-11-19 08:06:36,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:36,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:36,887 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:06:36,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1449470417] [2022-11-19 08:06:36,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:36,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:36,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:36,890 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:36,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 08:06:36,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:36,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 08:06:36,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:37,046 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 64 proven. 12 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-11-19 08:06:37,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:37,153 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 38 proven. 12 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2022-11-19 08:06:37,153 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:37,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518335562] [2022-11-19 08:06:37,154 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:06:37,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449470417] [2022-11-19 08:06:37,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449470417] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:37,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2090442370] [2022-11-19 08:06:37,157 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:06:37,157 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:37,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:37,158 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:37,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:41,120 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 08:06:41,173 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:06:41,213 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:43,737 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6191#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:43,738 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:43,738 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:06:43,738 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2022-11-19 08:06:43,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132472393] [2022-11-19 08:06:43,738 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:43,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 08:06:43,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:43,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 08:06:43,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2022-11-19 08:06:43,740 INFO L87 Difference]: Start difference. First operand 200 states and 261 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-19 08:06:43,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:43,956 INFO L93 Difference]: Finished difference Result 492 states and 676 transitions. [2022-11-19 08:06:43,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 08:06:43,957 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 82 [2022-11-19 08:06:43,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:43,961 INFO L225 Difference]: With dead ends: 492 [2022-11-19 08:06:43,961 INFO L226 Difference]: Without dead ends: 356 [2022-11-19 08:06:43,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2022-11-19 08:06:43,963 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 16 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:43,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 115 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:06:43,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2022-11-19 08:06:44,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 345. [2022-11-19 08:06:44,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 259 states have (on average 1.2664092664092663) internal successors, (328), 265 states have internal predecessors, (328), 74 states have call successors, (74), 12 states have call predecessors, (74), 11 states have return successors, (73), 67 states have call predecessors, (73), 73 states have call successors, (73) [2022-11-19 08:06:44,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 475 transitions. [2022-11-19 08:06:44,098 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 475 transitions. Word has length 82 [2022-11-19 08:06:44,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:44,099 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 475 transitions. [2022-11-19 08:06:44,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-19 08:06:44,099 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 475 transitions. [2022-11-19 08:06:44,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 08:06:44,102 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:44,102 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:44,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 08:06:44,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 08:06:44,309 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:44,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:44,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1378770924, now seen corresponding path program 2 times [2022-11-19 08:06:44,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:44,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626876223] [2022-11-19 08:06:44,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:44,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:44,319 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:06:44,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [813718664] [2022-11-19 08:06:44,320 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:06:44,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:44,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:44,321 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:44,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 08:06:44,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:06:44,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:06:44,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 08:06:44,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:44,448 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-11-19 08:06:44,449 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:06:44,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:44,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626876223] [2022-11-19 08:06:44,449 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:06:44,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813718664] [2022-11-19 08:06:44,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [813718664] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:06:44,450 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:06:44,450 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 08:06:44,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414389676] [2022-11-19 08:06:44,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:06:44,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:06:44,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:44,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:06:44,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 08:06:44,452 INFO L87 Difference]: Start difference. First operand 345 states and 475 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-19 08:06:44,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:44,684 INFO L93 Difference]: Finished difference Result 591 states and 827 transitions. [2022-11-19 08:06:44,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:06:44,684 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 82 [2022-11-19 08:06:44,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:44,688 INFO L225 Difference]: With dead ends: 591 [2022-11-19 08:06:44,688 INFO L226 Difference]: Without dead ends: 442 [2022-11-19 08:06:44,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:06:44,690 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 17 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:44,691 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 133 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:06:44,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2022-11-19 08:06:44,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 375. [2022-11-19 08:06:44,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 284 states have (on average 1.2464788732394365) internal successors, (354), 290 states have internal predecessors, (354), 78 states have call successors, (78), 13 states have call predecessors, (78), 12 states have return successors, (77), 71 states have call predecessors, (77), 77 states have call successors, (77) [2022-11-19 08:06:44,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 509 transitions. [2022-11-19 08:06:44,890 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 509 transitions. Word has length 82 [2022-11-19 08:06:44,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:44,892 INFO L495 AbstractCegarLoop]: Abstraction has 375 states and 509 transitions. [2022-11-19 08:06:44,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-19 08:06:44,892 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 509 transitions. [2022-11-19 08:06:44,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 08:06:44,896 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:44,896 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:44,907 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-19 08:06:45,102 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 08:06:45,103 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:45,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:45,105 INFO L85 PathProgramCache]: Analyzing trace with hash -760314426, now seen corresponding path program 3 times [2022-11-19 08:06:45,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:45,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13008897] [2022-11-19 08:06:45,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:45,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:45,127 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:06:45,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2124742640] [2022-11-19 08:06:45,130 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:06:45,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:45,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:45,133 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:45,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 08:06:45,320 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:06:45,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:06:45,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-19 08:06:45,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:45,528 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 152 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:06:45,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:45,811 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 40 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-19 08:06:45,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:45,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13008897] [2022-11-19 08:06:45,811 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:06:45,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124742640] [2022-11-19 08:06:45,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124742640] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:45,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1931502095] [2022-11-19 08:06:45,814 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:06:45,814 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:45,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:45,815 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:45,815 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:50,669 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 08:06:50,684 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:06:50,724 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:00,025 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9638#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 54) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:00,025 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:00,025 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:07:00,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-19 08:07:00,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749418801] [2022-11-19 08:07:00,026 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:00,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 08:07:00,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:00,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 08:07:00,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=1515, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 08:07:00,030 INFO L87 Difference]: Start difference. First operand 375 states and 509 transitions. Second operand has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2022-11-19 08:07:01,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:01,553 INFO L93 Difference]: Finished difference Result 1151 states and 1656 transitions. [2022-11-19 08:07:01,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-19 08:07:01,554 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) Word has length 82 [2022-11-19 08:07:01,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:01,561 INFO L225 Difference]: With dead ends: 1151 [2022-11-19 08:07:01,561 INFO L226 Difference]: Without dead ends: 1100 [2022-11-19 08:07:01,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1235 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=689, Invalid=2851, Unknown=0, NotChecked=0, Total=3540 [2022-11-19 08:07:01,564 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 670 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 378 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 670 SdHoareTripleChecker+Valid, 450 SdHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 378 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:01,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [670 Valid, 450 Invalid, 646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [378 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 08:07:01,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1100 states. [2022-11-19 08:07:01,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1100 to 1040. [2022-11-19 08:07:01,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1040 states, 785 states have (on average 1.2560509554140127) internal successors, (986), 794 states have internal predecessors, (986), 234 states have call successors, (234), 21 states have call predecessors, (234), 20 states have return successors, (233), 224 states have call predecessors, (233), 233 states have call successors, (233) [2022-11-19 08:07:01,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1040 states to 1040 states and 1453 transitions. [2022-11-19 08:07:01,941 INFO L78 Accepts]: Start accepts. Automaton has 1040 states and 1453 transitions. Word has length 82 [2022-11-19 08:07:01,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:01,942 INFO L495 AbstractCegarLoop]: Abstraction has 1040 states and 1453 transitions. [2022-11-19 08:07:01,942 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2022-11-19 08:07:01,942 INFO L276 IsEmpty]: Start isEmpty. Operand 1040 states and 1453 transitions. [2022-11-19 08:07:01,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-19 08:07:01,945 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:01,945 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:01,953 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-19 08:07:02,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:02,154 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:02,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:02,155 INFO L85 PathProgramCache]: Analyzing trace with hash -1887960563, now seen corresponding path program 1 times [2022-11-19 08:07:02,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:02,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78844763] [2022-11-19 08:07:02,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:02,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:02,168 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:07:02,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [615214272] [2022-11-19 08:07:02,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:02,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:02,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:02,170 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:02,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 08:07:02,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:02,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-19 08:07:02,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:02,494 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 190 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:07:02,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:02,804 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 46 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2022-11-19 08:07:02,804 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:02,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78844763] [2022-11-19 08:07:02,804 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:07:02,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615214272] [2022-11-19 08:07:02,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615214272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:02,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [263295614] [2022-11-19 08:07:02,807 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:07:02,808 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:02,808 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:02,809 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:02,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:10,567 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 08:07:10,573 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:07:10,606 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:16,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13492#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= ~counter~0 53) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:16,983 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:16,984 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:07:16,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2022-11-19 08:07:16,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174292171] [2022-11-19 08:07:16,984 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:16,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-19 08:07:16,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:16,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-19 08:07:16,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=1480, Unknown=0, NotChecked=0, Total=1892 [2022-11-19 08:07:16,987 INFO L87 Difference]: Start difference. First operand 1040 states and 1453 transitions. Second operand has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2022-11-19 08:07:18,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:18,563 INFO L93 Difference]: Finished difference Result 1518 states and 2107 transitions. [2022-11-19 08:07:18,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 08:07:18,564 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) Word has length 88 [2022-11-19 08:07:18,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:18,569 INFO L225 Difference]: With dead ends: 1518 [2022-11-19 08:07:18,569 INFO L226 Difference]: Without dead ends: 820 [2022-11-19 08:07:18,572 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=760, Invalid=2900, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 08:07:18,573 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 543 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 280 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 543 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 280 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:18,574 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [543 Valid, 497 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [280 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 08:07:18,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 820 states. [2022-11-19 08:07:18,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 820 to 764. [2022-11-19 08:07:18,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 573 states have (on average 1.2076788830715532) internal successors, (692), 578 states have internal predecessors, (692), 168 states have call successors, (168), 23 states have call predecessors, (168), 22 states have return successors, (167), 162 states have call predecessors, (167), 167 states have call successors, (167) [2022-11-19 08:07:18,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 1027 transitions. [2022-11-19 08:07:18,983 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 1027 transitions. Word has length 88 [2022-11-19 08:07:18,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:18,984 INFO L495 AbstractCegarLoop]: Abstraction has 764 states and 1027 transitions. [2022-11-19 08:07:18,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2022-11-19 08:07:18,985 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 1027 transitions. [2022-11-19 08:07:18,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-19 08:07:18,990 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:18,990 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:18,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:19,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 08:07:19,197 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:19,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:19,198 INFO L85 PathProgramCache]: Analyzing trace with hash -890970028, now seen corresponding path program 1 times [2022-11-19 08:07:19,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:19,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552240624] [2022-11-19 08:07:19,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:19,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:19,208 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:07:19,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [270185331] [2022-11-19 08:07:19,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:19,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:19,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:19,212 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:19,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 08:07:19,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:19,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-19 08:07:19,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:19,550 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 236 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:07:19,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:19,941 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-11-19 08:07:19,941 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:19,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552240624] [2022-11-19 08:07:19,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:07:19,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270185331] [2022-11-19 08:07:19,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270185331] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:19,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [229813665] [2022-11-19 08:07:19,944 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:07:19,944 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:19,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:19,945 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:19,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:24,200 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 08:07:24,206 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:07:24,238 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:34,529 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17505#(and (<= ~counter~0 52) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:34,529 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:34,529 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:07:34,529 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-11-19 08:07:34,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988446985] [2022-11-19 08:07:34,530 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:34,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 08:07:34,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:34,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 08:07:34,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=457, Invalid=1523, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 08:07:34,533 INFO L87 Difference]: Start difference. First operand 764 states and 1027 transitions. Second operand has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-11-19 08:07:36,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:36,203 INFO L93 Difference]: Finished difference Result 875 states and 1183 transitions. [2022-11-19 08:07:36,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-19 08:07:36,204 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) Word has length 94 [2022-11-19 08:07:36,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:36,209 INFO L225 Difference]: With dead ends: 875 [2022-11-19 08:07:36,209 INFO L226 Difference]: Without dead ends: 870 [2022-11-19 08:07:36,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 235 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1354 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=846, Invalid=3060, Unknown=0, NotChecked=0, Total=3906 [2022-11-19 08:07:36,213 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 554 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 306 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 554 SdHoareTripleChecker+Valid, 507 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 306 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:36,213 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [554 Valid, 507 Invalid, 671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [306 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 08:07:36,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 870 states. [2022-11-19 08:07:36,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 870 to 855. [2022-11-19 08:07:36,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 855 states, 644 states have (on average 1.1832298136645962) internal successors, (762), 650 states have internal predecessors, (762), 186 states have call successors, (186), 25 states have call predecessors, (186), 24 states have return successors, (185), 179 states have call predecessors, (185), 185 states have call successors, (185) [2022-11-19 08:07:36,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 855 states to 855 states and 1133 transitions. [2022-11-19 08:07:36,631 INFO L78 Accepts]: Start accepts. Automaton has 855 states and 1133 transitions. Word has length 94 [2022-11-19 08:07:36,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:36,632 INFO L495 AbstractCegarLoop]: Abstraction has 855 states and 1133 transitions. [2022-11-19 08:07:36,632 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-11-19 08:07:36,633 INFO L276 IsEmpty]: Start isEmpty. Operand 855 states and 1133 transitions. [2022-11-19 08:07:36,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 08:07:36,639 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:36,639 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:36,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:36,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 08:07:36,846 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:36,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:36,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1384815896, now seen corresponding path program 4 times [2022-11-19 08:07:36,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:36,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119214080] [2022-11-19 08:07:36,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:36,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:36,871 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:07:36,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [351264300] [2022-11-19 08:07:36,872 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:07:36,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:36,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:36,873 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:36,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 08:07:36,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:36,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:07:36,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:37,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 612 proven. 0 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2022-11-19 08:07:37,024 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:07:37,024 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:37,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119214080] [2022-11-19 08:07:37,024 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:07:37,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351264300] [2022-11-19 08:07:37,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351264300] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:07:37,025 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:07:37,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:07:37,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404454605] [2022-11-19 08:07:37,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:07:37,026 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:07:37,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:37,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:07:37,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:07:37,027 INFO L87 Difference]: Start difference. First operand 855 states and 1133 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 08:07:37,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:37,545 INFO L93 Difference]: Finished difference Result 1450 states and 1919 transitions. [2022-11-19 08:07:37,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:07:37,546 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 178 [2022-11-19 08:07:37,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:37,552 INFO L225 Difference]: With dead ends: 1450 [2022-11-19 08:07:37,552 INFO L226 Difference]: Without dead ends: 919 [2022-11-19 08:07:37,554 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:07:37,555 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 3 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:37,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 65 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:07:37,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 919 states. [2022-11-19 08:07:37,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 919 to 846. [2022-11-19 08:07:37,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 846 states, 640 states have (on average 1.171875) internal successors, (750), 649 states have internal predecessors, (750), 181 states have call successors, (181), 25 states have call predecessors, (181), 24 states have return successors, (180), 171 states have call predecessors, (180), 180 states have call successors, (180) [2022-11-19 08:07:37,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 1111 transitions. [2022-11-19 08:07:37,959 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 1111 transitions. Word has length 178 [2022-11-19 08:07:37,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:37,960 INFO L495 AbstractCegarLoop]: Abstraction has 846 states and 1111 transitions. [2022-11-19 08:07:37,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 08:07:37,961 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 1111 transitions. [2022-11-19 08:07:37,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 08:07:37,966 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:37,966 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 9, 8, 8, 8, 8, 7, 7, 7, 6, 5, 5, 5, 5, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:37,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:38,173 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 08:07:38,174 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:38,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:38,174 INFO L85 PathProgramCache]: Analyzing trace with hash 437435780, now seen corresponding path program 5 times [2022-11-19 08:07:38,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:38,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192257996] [2022-11-19 08:07:38,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:38,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:38,199 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:07:38,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [388981911] [2022-11-19 08:07:38,200 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:07:38,200 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:38,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:38,201 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:38,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 08:07:38,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 08:07:38,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:07:38,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 08:07:38,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:38,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1078 backedges. 120 proven. 0 refuted. 0 times theorem prover too weak. 958 trivial. 0 not checked. [2022-11-19 08:07:38,361 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:07:38,361 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:38,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192257996] [2022-11-19 08:07:38,362 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:07:38,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388981911] [2022-11-19 08:07:38,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388981911] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:07:38,362 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:07:38,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 08:07:38,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274565664] [2022-11-19 08:07:38,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:07:38,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 08:07:38,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:38,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 08:07:38,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:07:38,364 INFO L87 Difference]: Start difference. First operand 846 states and 1111 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-19 08:07:38,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:38,720 INFO L93 Difference]: Finished difference Result 858 states and 1121 transitions. [2022-11-19 08:07:38,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 08:07:38,721 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 178 [2022-11-19 08:07:38,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:38,726 INFO L225 Difference]: With dead ends: 858 [2022-11-19 08:07:38,727 INFO L226 Difference]: Without dead ends: 807 [2022-11-19 08:07:38,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:07:38,729 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 12 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:38,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 79 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:07:38,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 807 states. [2022-11-19 08:07:39,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 807 to 792. [2022-11-19 08:07:39,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 792 states, 598 states have (on average 1.1672240802675586) internal successors, (698), 605 states have internal predecessors, (698), 169 states have call successors, (169), 25 states have call predecessors, (169), 24 states have return successors, (168), 161 states have call predecessors, (168), 168 states have call successors, (168) [2022-11-19 08:07:39,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 1035 transitions. [2022-11-19 08:07:39,109 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 1035 transitions. Word has length 178 [2022-11-19 08:07:39,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:39,109 INFO L495 AbstractCegarLoop]: Abstraction has 792 states and 1035 transitions. [2022-11-19 08:07:39,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-19 08:07:39,110 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 1035 transitions. [2022-11-19 08:07:39,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 08:07:39,115 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:39,115 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:39,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:39,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:39,321 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:39,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:39,322 INFO L85 PathProgramCache]: Analyzing trace with hash -223810874, now seen corresponding path program 6 times [2022-11-19 08:07:39,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:39,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242263433] [2022-11-19 08:07:39,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:39,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:39,338 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:07:39,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [969027411] [2022-11-19 08:07:39,339 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:07:39,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:39,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:39,341 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:39,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 08:07:39,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:07:39,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:07:39,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 08:07:39,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:39,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 280 proven. 184 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2022-11-19 08:07:39,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:39,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 140 proven. 184 refuted. 0 times theorem prover too weak. 782 trivial. 0 not checked. [2022-11-19 08:07:39,994 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:39,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242263433] [2022-11-19 08:07:39,995 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:07:39,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969027411] [2022-11-19 08:07:39,995 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969027411] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:39,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283093782] [2022-11-19 08:07:39,998 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:07:39,998 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:39,999 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:39,999 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:40,000 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:44,896 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 08:07:44,956 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:07:44,988 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:51,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28081#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:51,387 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:51,387 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:07:51,388 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2022-11-19 08:07:51,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521922593] [2022-11-19 08:07:51,388 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:51,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-19 08:07:51,388 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:51,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-19 08:07:51,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2022-11-19 08:07:51,390 INFO L87 Difference]: Start difference. First operand 792 states and 1035 transitions. Second operand has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2022-11-19 08:07:53,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:53,158 INFO L93 Difference]: Finished difference Result 1829 states and 2460 transitions. [2022-11-19 08:07:53,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 08:07:53,159 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) Word has length 178 [2022-11-19 08:07:53,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:53,168 INFO L225 Difference]: With dead ends: 1829 [2022-11-19 08:07:53,168 INFO L226 Difference]: Without dead ends: 1606 [2022-11-19 08:07:53,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 499 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=190, Invalid=1616, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 08:07:53,171 INFO L413 NwaCegarLoop]: 197 mSDtfsCounter, 133 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 751 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:53,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 751 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 663 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 08:07:53,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1606 states. [2022-11-19 08:07:53,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1606 to 1375. [2022-11-19 08:07:53,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1375 states, 1039 states have (on average 1.1828681424446583) internal successors, (1229), 1055 states have internal predecessors, (1229), 311 states have call successors, (311), 25 states have call predecessors, (311), 24 states have return successors, (310), 294 states have call predecessors, (310), 310 states have call successors, (310) [2022-11-19 08:07:53,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1375 states to 1375 states and 1850 transitions. [2022-11-19 08:07:53,921 INFO L78 Accepts]: Start accepts. Automaton has 1375 states and 1850 transitions. Word has length 178 [2022-11-19 08:07:53,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:53,922 INFO L495 AbstractCegarLoop]: Abstraction has 1375 states and 1850 transitions. [2022-11-19 08:07:53,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2022-11-19 08:07:53,922 INFO L276 IsEmpty]: Start isEmpty. Operand 1375 states and 1850 transitions. [2022-11-19 08:07:53,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 08:07:53,930 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:53,930 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 10, 9, 9, 9, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:53,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:54,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:54,138 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:54,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:54,138 INFO L85 PathProgramCache]: Analyzing trace with hash -654614764, now seen corresponding path program 7 times [2022-11-19 08:07:54,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:54,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749640661] [2022-11-19 08:07:54,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:54,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:54,148 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:07:54,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2059988976] [2022-11-19 08:07:54,148 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:07:54,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:54,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:54,150 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:54,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 08:07:54,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:54,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 08:07:54,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:54,479 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 516 proven. 84 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2022-11-19 08:07:54,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:54,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 226 proven. 84 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2022-11-19 08:07:54,788 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:54,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749640661] [2022-11-19 08:07:54,788 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:07:54,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059988976] [2022-11-19 08:07:54,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059988976] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:54,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [766731291] [2022-11-19 08:07:54,791 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:07:54,792 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:54,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:54,793 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:54,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:57,654 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 08:07:57,711 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:07:57,746 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:08:00,846 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33982#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:08:00,846 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:08:00,847 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:08:00,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-11-19 08:08:00,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587884895] [2022-11-19 08:08:00,847 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:08:00,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 08:08:00,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:08:00,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 08:08:00,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2022-11-19 08:08:00,849 INFO L87 Difference]: Start difference. First operand 1375 states and 1850 transitions. Second operand has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2022-11-19 08:08:03,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:08:03,818 INFO L93 Difference]: Finished difference Result 2960 states and 4046 transitions. [2022-11-19 08:08:03,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 08:08:03,819 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) Word has length 178 [2022-11-19 08:08:03,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:08:03,837 INFO L225 Difference]: With dead ends: 2960 [2022-11-19 08:08:03,837 INFO L226 Difference]: Without dead ends: 2637 [2022-11-19 08:08:03,840 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 525 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=448, Invalid=2744, Unknown=0, NotChecked=0, Total=3192 [2022-11-19 08:08:03,840 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 207 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 704 SdHoareTripleChecker+Invalid, 852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 08:08:03,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 704 Invalid, 852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 08:08:03,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2637 states. [2022-11-19 08:08:04,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2637 to 2039. [2022-11-19 08:08:04,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2039 states, 1536 states have (on average 1.1725260416666667) internal successors, (1801), 1564 states have internal predecessors, (1801), 478 states have call successors, (478), 25 states have call predecessors, (478), 24 states have return successors, (477), 449 states have call predecessors, (477), 477 states have call successors, (477) [2022-11-19 08:08:04,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2039 states to 2039 states and 2756 transitions. [2022-11-19 08:08:04,954 INFO L78 Accepts]: Start accepts. Automaton has 2039 states and 2756 transitions. Word has length 178 [2022-11-19 08:08:04,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:08:04,954 INFO L495 AbstractCegarLoop]: Abstraction has 2039 states and 2756 transitions. [2022-11-19 08:08:04,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2022-11-19 08:08:04,955 INFO L276 IsEmpty]: Start isEmpty. Operand 2039 states and 2756 transitions. [2022-11-19 08:08:04,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 08:08:04,963 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:08:04,964 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:08:04,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 08:08:05,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:05,170 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:08:05,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:08:05,171 INFO L85 PathProgramCache]: Analyzing trace with hash 1253226182, now seen corresponding path program 8 times [2022-11-19 08:08:05,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:08:05,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707958515] [2022-11-19 08:08:05,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:08:05,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:08:05,199 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:08:05,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [562659782] [2022-11-19 08:08:05,210 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:08:05,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:05,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:08:05,212 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:08:05,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 08:08:06,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-19 08:08:06,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:08:06,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-19 08:08:06,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:08:06,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 248 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2022-11-19 08:08:06,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:08:06,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 248 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2022-11-19 08:08:06,854 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:08:06,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707958515] [2022-11-19 08:08:06,854 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:08:06,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562659782] [2022-11-19 08:08:06,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562659782] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:08:06,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1111476969] [2022-11-19 08:08:06,856 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:08:06,856 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:08:06,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:08:06,857 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:08:06,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:08:09,221 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 08:08:09,268 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:08:09,296 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:08:14,851 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42638#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:08:14,852 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:08:14,852 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:08:14,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2022-11-19 08:08:14,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726024510] [2022-11-19 08:08:14,852 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:08:14,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 08:08:14,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:08:14,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 08:08:14,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1204, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 08:08:14,854 INFO L87 Difference]: Start difference. First operand 2039 states and 2756 transitions. Second operand has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) [2022-11-19 08:08:18,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:08:18,692 INFO L93 Difference]: Finished difference Result 3587 states and 4919 transitions. [2022-11-19 08:08:18,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-19 08:08:18,695 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) Word has length 178 [2022-11-19 08:08:18,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:08:18,710 INFO L225 Difference]: With dead ends: 3587 [2022-11-19 08:08:18,710 INFO L226 Difference]: Without dead ends: 3276 [2022-11-19 08:08:18,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 495 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=506, Invalid=4464, Unknown=0, NotChecked=0, Total=4970 [2022-11-19 08:08:18,715 INFO L413 NwaCegarLoop]: 335 mSDtfsCounter, 339 mSDsluCounter, 1264 mSDsCounter, 0 mSdLazyCounter, 1598 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 1599 SdHoareTripleChecker+Invalid, 1822 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 1598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:08:18,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [347 Valid, 1599 Invalid, 1822 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 1598 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 08:08:18,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3276 states. [2022-11-19 08:08:19,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3276 to 2581. [2022-11-19 08:08:19,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2581 states, 1946 states have (on average 1.183967112024666) internal successors, (2304), 1988 states have internal predecessors, (2304), 610 states have call successors, (610), 25 states have call predecessors, (610), 24 states have return successors, (609), 567 states have call predecessors, (609), 609 states have call successors, (609) [2022-11-19 08:08:19,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2581 states to 2581 states and 3523 transitions. [2022-11-19 08:08:19,781 INFO L78 Accepts]: Start accepts. Automaton has 2581 states and 3523 transitions. Word has length 178 [2022-11-19 08:08:19,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:08:19,781 INFO L495 AbstractCegarLoop]: Abstraction has 2581 states and 3523 transitions. [2022-11-19 08:08:19,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) [2022-11-19 08:08:19,782 INFO L276 IsEmpty]: Start isEmpty. Operand 2581 states and 3523 transitions. [2022-11-19 08:08:19,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 08:08:19,794 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:08:19,794 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:08:19,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-19 08:08:20,002 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-19 08:08:20,003 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:08:20,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:08:20,003 INFO L85 PathProgramCache]: Analyzing trace with hash 2135458502, now seen corresponding path program 9 times [2022-11-19 08:08:20,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:08:20,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216971959] [2022-11-19 08:08:20,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:08:20,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:08:20,013 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:08:20,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [657121004] [2022-11-19 08:08:20,013 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:08:20,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:20,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:08:20,015 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:08:20,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-19 08:08:20,343 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:08:20,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:08:20,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-19 08:08:20,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:08:20,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 1044 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:08:20,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:08:21,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 284 refuted. 0 times theorem prover too weak. 762 trivial. 0 not checked. [2022-11-19 08:08:21,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:08:21,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216971959] [2022-11-19 08:08:21,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:08:21,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657121004] [2022-11-19 08:08:21,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657121004] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:08:21,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [224224823] [2022-11-19 08:08:21,785 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:08:21,786 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:08:21,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:08:21,786 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:08:21,786 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:08:24,427 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 08:08:24,494 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:08:24,535 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:08:27,522 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53092#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-19 08:08:27,522 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:08:27,522 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:08:27,522 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24] total 46 [2022-11-19 08:08:27,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881459763] [2022-11-19 08:08:27,522 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:08:27,523 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-19 08:08:27,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:08:27,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-19 08:08:27,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=2918, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 08:08:27,525 INFO L87 Difference]: Start difference. First operand 2581 states and 3523 transitions. Second operand has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2022-11-19 08:08:35,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:08:35,199 INFO L93 Difference]: Finished difference Result 10562 states and 15878 transitions. [2022-11-19 08:08:35,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-11-19 08:08:35,200 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) Word has length 178 [2022-11-19 08:08:35,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:08:35,248 INFO L225 Difference]: With dead ends: 10562 [2022-11-19 08:08:35,249 INFO L226 Difference]: Without dead ends: 10459 [2022-11-19 08:08:35,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3073 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=2982, Invalid=7938, Unknown=0, NotChecked=0, Total=10920 [2022-11-19 08:08:35,258 INFO L413 NwaCegarLoop]: 144 mSDtfsCounter, 1538 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 818 mSolverCounterSat, 821 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1538 SdHoareTripleChecker+Valid, 861 SdHoareTripleChecker+Invalid, 1639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 821 IncrementalHoareTripleChecker+Valid, 818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:08:35,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1538 Valid, 861 Invalid, 1639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [821 Valid, 818 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-19 08:08:35,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10459 states. [2022-11-19 08:08:39,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10459 to 10204. [2022-11-19 08:08:39,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10204 states, 7669 states have (on average 1.2558351805972094) internal successors, (9631), 7732 states have internal predecessors, (9631), 2490 states have call successors, (2490), 45 states have call predecessors, (2490), 44 states have return successors, (2489), 2426 states have call predecessors, (2489), 2489 states have call successors, (2489) [2022-11-19 08:08:39,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10204 states to 10204 states and 14610 transitions. [2022-11-19 08:08:39,637 INFO L78 Accepts]: Start accepts. Automaton has 10204 states and 14610 transitions. Word has length 178 [2022-11-19 08:08:39,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:08:39,638 INFO L495 AbstractCegarLoop]: Abstraction has 10204 states and 14610 transitions. [2022-11-19 08:08:39,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2022-11-19 08:08:39,657 INFO L276 IsEmpty]: Start isEmpty. Operand 10204 states and 14610 transitions. [2022-11-19 08:08:39,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2022-11-19 08:08:39,670 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:08:39,671 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 10, 10, 10, 10, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:08:39,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-19 08:08:39,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:39,878 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:08:39,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:08:39,878 INFO L85 PathProgramCache]: Analyzing trace with hash 97743629, now seen corresponding path program 2 times [2022-11-19 08:08:39,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:08:39,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014081481] [2022-11-19 08:08:39,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:08:39,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:08:39,890 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:08:39,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1875374480] [2022-11-19 08:08:39,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:08:39,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:08:39,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:08:39,893 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:08:39,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-19 08:08:41,325 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-19 08:08:41,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:08:41,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-19 08:08:41,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:08:41,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 1142 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:08:41,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:08:42,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 302 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2022-11-19 08:08:42,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:08:42,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014081481] [2022-11-19 08:08:42,950 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:08:42,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875374480] [2022-11-19 08:08:42,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875374480] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:08:42,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1667264302] [2022-11-19 08:08:42,952 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:08:42,952 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:08:42,952 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:08:42,952 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:08:42,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:08:46,991 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 08:08:46,997 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:08:47,043 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:08:52,491 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85448#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= ~counter~0 53) (= |#NULL.base| 0))' at error location [2022-11-19 08:08:52,491 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:08:52,491 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:08:52,491 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 48 [2022-11-19 08:08:52,492 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101336244] [2022-11-19 08:08:52,492 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:08:52,492 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-19 08:08:52,492 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:08:52,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-19 08:08:52,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=3220, Unknown=0, NotChecked=0, Total=4556 [2022-11-19 08:08:52,495 INFO L87 Difference]: Start difference. First operand 10204 states and 14610 transitions. Second operand has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2022-11-19 08:08:58,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:08:58,564 INFO L93 Difference]: Finished difference Result 15319 states and 22102 transitions. [2022-11-19 08:08:58,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-19 08:08:58,565 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) Word has length 184 [2022-11-19 08:08:58,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:08:58,600 INFO L225 Difference]: With dead ends: 15319 [2022-11-19 08:08:58,600 INFO L226 Difference]: Without dead ends: 7786 [2022-11-19 08:08:58,623 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 484 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3286 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=3160, Invalid=8612, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 08:08:58,624 INFO L413 NwaCegarLoop]: 150 mSDtfsCounter, 1771 mSDsluCounter, 832 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 982 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1771 SdHoareTripleChecker+Valid, 982 SdHoareTripleChecker+Invalid, 1796 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 982 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:08:58,624 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1771 Valid, 982 Invalid, 1796 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [982 Valid, 814 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 08:08:58,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7786 states. [2022-11-19 08:09:01,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7786 to 7555. [2022-11-19 08:09:01,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7555 states, 5667 states have (on average 1.1838715369684136) internal successors, (6709), 5715 states have internal predecessors, (6709), 1841 states have call successors, (1841), 47 states have call predecessors, (1841), 46 states have return successors, (1840), 1792 states have call predecessors, (1840), 1840 states have call successors, (1840) [2022-11-19 08:09:01,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7555 states to 7555 states and 10390 transitions. [2022-11-19 08:09:01,686 INFO L78 Accepts]: Start accepts. Automaton has 7555 states and 10390 transitions. Word has length 184 [2022-11-19 08:09:01,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:09:01,687 INFO L495 AbstractCegarLoop]: Abstraction has 7555 states and 10390 transitions. [2022-11-19 08:09:01,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2022-11-19 08:09:01,688 INFO L276 IsEmpty]: Start isEmpty. Operand 7555 states and 10390 transitions. [2022-11-19 08:09:01,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2022-11-19 08:09:01,700 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:09:01,700 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 10, 10, 10, 10, 8, 8, 8, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:09:01,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-19 08:09:01,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-19 08:09:01,910 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:09:01,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:09:01,910 INFO L85 PathProgramCache]: Analyzing trace with hash 1898418516, now seen corresponding path program 2 times [2022-11-19 08:09:01,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:09:01,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985204911] [2022-11-19 08:09:01,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:09:01,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:09:01,927 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:09:01,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2004235332] [2022-11-19 08:09:01,927 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:09:01,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:01,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:09:01,929 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:09:01,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-19 08:09:03,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-19 08:09:03,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:09:03,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-19 08:09:03,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:09:04,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 1248 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:09:04,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:09:05,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 324 refuted. 0 times theorem prover too weak. 926 trivial. 0 not checked. [2022-11-19 08:09:05,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:09:05,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985204911] [2022-11-19 08:09:05,315 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:09:05,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004235332] [2022-11-19 08:09:05,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004235332] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:09:05,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1075917142] [2022-11-19 08:09:05,317 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:09:05,317 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:09:05,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:09:05,317 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:09:05,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:09:09,582 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 08:09:09,587 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:09:09,621 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:09:16,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '120993#(and (<= ~counter~0 52) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:09:16,770 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:09:16,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:09:16,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2022-11-19 08:09:16,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378372834] [2022-11-19 08:09:16,770 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:09:16,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-19 08:09:16,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:09:16,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-19 08:09:16,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1429, Invalid=3263, Unknown=0, NotChecked=0, Total=4692 [2022-11-19 08:09:16,772 INFO L87 Difference]: Start difference. First operand 7555 states and 10390 transitions. Second operand has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-11-19 08:09:23,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:09:23,304 INFO L93 Difference]: Finished difference Result 8195 states and 11310 transitions. [2022-11-19 08:09:23,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-11-19 08:09:23,305 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) Word has length 190 [2022-11-19 08:09:23,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:09:23,335 INFO L225 Difference]: With dead ends: 8195 [2022-11-19 08:09:23,335 INFO L226 Difference]: Without dead ends: 8048 [2022-11-19 08:09:23,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 497 SyntacticMatches, 4 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=3342, Invalid=8868, Unknown=0, NotChecked=0, Total=12210 [2022-11-19 08:09:23,342 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 2101 mSDsluCounter, 794 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 1506 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2101 SdHoareTripleChecker+Valid, 950 SdHoareTripleChecker+Invalid, 2183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1506 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-19 08:09:23,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2101 Valid, 950 Invalid, 2183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1506 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-19 08:09:23,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8048 states. [2022-11-19 08:09:26,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8048 to 7339. [2022-11-19 08:09:26,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7339 states, 5514 states have (on average 1.1267682263329706) internal successors, (6213), 5558 states have internal predecessors, (6213), 1776 states have call successors, (1776), 49 states have call predecessors, (1776), 48 states have return successors, (1775), 1731 states have call predecessors, (1775), 1775 states have call successors, (1775) [2022-11-19 08:09:26,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7339 states to 7339 states and 9764 transitions. [2022-11-19 08:09:26,173 INFO L78 Accepts]: Start accepts. Automaton has 7339 states and 9764 transitions. Word has length 190 [2022-11-19 08:09:26,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:09:26,175 INFO L495 AbstractCegarLoop]: Abstraction has 7339 states and 9764 transitions. [2022-11-19 08:09:26,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-11-19 08:09:26,176 INFO L276 IsEmpty]: Start isEmpty. Operand 7339 states and 9764 transitions. [2022-11-19 08:09:26,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-19 08:09:26,209 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:09:26,209 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:09:26,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-19 08:09:26,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:26,422 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:09:26,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:09:26,423 INFO L85 PathProgramCache]: Analyzing trace with hash 1302721490, now seen corresponding path program 10 times [2022-11-19 08:09:26,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:09:26,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075764908] [2022-11-19 08:09:26,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:09:26,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:09:26,455 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:09:26,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [403037278] [2022-11-19 08:09:26,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:09:26,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:26,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:09:26,457 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:09:26,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-19 08:09:26,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:09:26,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-19 08:09:26,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:09:27,441 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 416 proven. 1164 refuted. 0 times theorem prover too weak. 3690 trivial. 0 not checked. [2022-11-19 08:09:27,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:09:28,489 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 266 proven. 1204 refuted. 0 times theorem prover too weak. 3800 trivial. 0 not checked. [2022-11-19 08:09:28,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:09:28,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075764908] [2022-11-19 08:09:28,489 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:09:28,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403037278] [2022-11-19 08:09:28,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403037278] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:09:28,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [396003319] [2022-11-19 08:09:28,492 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:09:28,492 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:09:28,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:09:28,492 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:09:28,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:09:31,095 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-19 08:09:31,145 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:09:31,175 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:09:38,984 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '146596#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:09:38,985 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:09:38,985 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:09:38,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 32 [2022-11-19 08:09:38,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503250596] [2022-11-19 08:09:38,986 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:09:38,987 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-19 08:09:38,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:09:38,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-19 08:09:38,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2365, Unknown=0, NotChecked=0, Total=2550 [2022-11-19 08:09:38,988 INFO L87 Difference]: Start difference. First operand 7339 states and 9764 transitions. Second operand has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2022-11-19 08:09:46,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:09:46,702 INFO L93 Difference]: Finished difference Result 10729 states and 14284 transitions. [2022-11-19 08:09:46,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-19 08:09:46,703 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) Word has length 370 [2022-11-19 08:09:46,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:09:46,740 INFO L225 Difference]: With dead ends: 10729 [2022-11-19 08:09:46,740 INFO L226 Difference]: Without dead ends: 8971 [2022-11-19 08:09:46,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1136 GetRequests, 1057 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=581, Invalid=5581, Unknown=0, NotChecked=0, Total=6162 [2022-11-19 08:09:46,748 INFO L413 NwaCegarLoop]: 303 mSDtfsCounter, 418 mSDsluCounter, 2716 mSDsCounter, 0 mSdLazyCounter, 3291 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 424 SdHoareTripleChecker+Valid, 3019 SdHoareTripleChecker+Invalid, 3515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 3291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:09:46,750 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [424 Valid, 3019 Invalid, 3515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 3291 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-19 08:09:46,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8971 states. [2022-11-19 08:09:49,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8971 to 7452. [2022-11-19 08:09:49,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7452 states, 5599 states have (on average 1.1269869619574924) internal successors, (6310), 5644 states have internal predecessors, (6310), 1804 states have call successors, (1804), 49 states have call predecessors, (1804), 48 states have return successors, (1803), 1758 states have call predecessors, (1803), 1803 states have call successors, (1803) [2022-11-19 08:09:49,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7452 states to 7452 states and 9917 transitions. [2022-11-19 08:09:49,957 INFO L78 Accepts]: Start accepts. Automaton has 7452 states and 9917 transitions. Word has length 370 [2022-11-19 08:09:49,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:09:49,958 INFO L495 AbstractCegarLoop]: Abstraction has 7452 states and 9917 transitions. [2022-11-19 08:09:49,958 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2022-11-19 08:09:49,958 INFO L276 IsEmpty]: Start isEmpty. Operand 7452 states and 9917 transitions. [2022-11-19 08:09:49,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-19 08:09:49,985 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:09:49,986 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:09:49,993 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-11-19 08:09:50,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:50,193 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:09:50,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:09:50,194 INFO L85 PathProgramCache]: Analyzing trace with hash -467354670, now seen corresponding path program 11 times [2022-11-19 08:09:50,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:09:50,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214107014] [2022-11-19 08:09:50,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:09:50,195 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:09:50,226 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:09:50,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1634206954] [2022-11-19 08:09:50,227 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:09:50,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:50,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:09:50,230 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:09:50,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-19 08:09:56,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-11-19 08:09:56,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:09:56,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 764 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-19 08:09:56,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:09:56,679 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 176 proven. 1280 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2022-11-19 08:09:56,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:09:57,566 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 236 proven. 1220 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2022-11-19 08:09:57,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:09:57,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214107014] [2022-11-19 08:09:57,567 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:09:57,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634206954] [2022-11-19 08:09:57,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634206954] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:09:57,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2033344563] [2022-11-19 08:09:57,569 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:09:57,569 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:09:57,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:09:57,570 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:09:57,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:10:01,836 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 08:10:01,841 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:10:01,871 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:10:17,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '176128#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 54) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:10:17,373 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:10:17,373 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:10:17,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 25 [2022-11-19 08:10:17,373 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764327158] [2022-11-19 08:10:17,373 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:10:17,374 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-19 08:10:17,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:10:17,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-19 08:10:17,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1991, Unknown=0, NotChecked=0, Total=2162 [2022-11-19 08:10:17,375 INFO L87 Difference]: Start difference. First operand 7452 states and 9917 transitions. Second operand has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) [2022-11-19 08:10:24,920 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-19 08:10:26,924 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-19 08:10:28,927 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-19 08:10:47,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:10:47,113 INFO L93 Difference]: Finished difference Result 29989 states and 40448 transitions. [2022-11-19 08:10:47,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-11-19 08:10:47,113 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) Word has length 370 [2022-11-19 08:10:47,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:10:47,316 INFO L225 Difference]: With dead ends: 29989 [2022-11-19 08:10:47,316 INFO L226 Difference]: Without dead ends: 28150 [2022-11-19 08:10:47,331 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1209 GetRequests, 1054 SyntacticMatches, 9 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6993 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=1797, Invalid=19959, Unknown=0, NotChecked=0, Total=21756 [2022-11-19 08:10:47,332 INFO L413 NwaCegarLoop]: 588 mSDtfsCounter, 904 mSDsluCounter, 3339 mSDsCounter, 0 mSdLazyCounter, 5467 mSolverCounterSat, 516 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 913 SdHoareTripleChecker+Valid, 3927 SdHoareTripleChecker+Invalid, 5986 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 516 IncrementalHoareTripleChecker+Valid, 5467 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2022-11-19 08:10:47,332 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [913 Valid, 3927 Invalid, 5986 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [516 Valid, 5467 Invalid, 3 Unknown, 0 Unchecked, 10.9s Time] [2022-11-19 08:10:47,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28150 states. [2022-11-19 08:10:56,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28150 to 19145. [2022-11-19 08:10:56,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19145 states, 14375 states have (on average 1.1407304347826086) internal successors, (16398), 14491 states have internal predecessors, (16398), 4721 states have call successors, (4721), 49 states have call predecessors, (4721), 48 states have return successors, (4720), 4604 states have call predecessors, (4720), 4720 states have call successors, (4720) [2022-11-19 08:10:56,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19145 states to 19145 states and 25839 transitions. [2022-11-19 08:10:56,584 INFO L78 Accepts]: Start accepts. Automaton has 19145 states and 25839 transitions. Word has length 370 [2022-11-19 08:10:56,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:10:56,585 INFO L495 AbstractCegarLoop]: Abstraction has 19145 states and 25839 transitions. [2022-11-19 08:10:56,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) [2022-11-19 08:10:56,586 INFO L276 IsEmpty]: Start isEmpty. Operand 19145 states and 25839 transitions. [2022-11-19 08:10:56,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-19 08:10:56,650 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:10:56,650 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:10:56,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-19 08:10:56,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-19 08:10:56,863 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:10:56,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:10:56,863 INFO L85 PathProgramCache]: Analyzing trace with hash -279568430, now seen corresponding path program 12 times [2022-11-19 08:10:56,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:10:56,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062137453] [2022-11-19 08:10:56,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:10:56,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:10:56,895 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:10:56,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1326811745] [2022-11-19 08:10:56,896 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:10:56,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:10:56,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:10:56,897 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:10:56,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-19 08:10:57,178 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:10:57,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:10:57,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 142 conjunts are in the unsatisfiable core [2022-11-19 08:10:57,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:11:05,359 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 2814 proven. 759 refuted. 0 times theorem prover too weak. 1697 trivial. 0 not checked. [2022-11-19 08:11:05,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:11:07,925 WARN L837 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~v~0#1| Int) (|ULTIMATE.start_main_~r~0#1| Int)) (not (= (+ (* |c_ULTIMATE.start_main_~u~0#1| |c_ULTIMATE.start_main_~u~0#1|) (* 2 |ULTIMATE.start_main_~v~0#1|)) (+ (* |ULTIMATE.start_main_~r~0#1| 4) (* |c_ULTIMATE.start_main_~u~0#1| 2) (* |ULTIMATE.start_main_~v~0#1| |ULTIMATE.start_main_~v~0#1|) (* |c_ULTIMATE.start_main_~A~0#1| 4))))) is different from false [2022-11-19 08:11:07,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:11:07,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062137453] [2022-11-19 08:11:07,927 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:11:07,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326811745] [2022-11-19 08:11:07,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1326811745] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:11:07,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1494562902] [2022-11-19 08:11:07,929 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:11:07,929 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:11:07,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:11:07,930 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:11:07,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:11:12,023 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 08:11:12,031 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:11:12,062 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:11:20,527 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '251387#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 54) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:11:20,527 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:11:20,527 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:11:20,527 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2022-11-19 08:11:20,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840691566] [2022-11-19 08:11:20,528 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-19 08:11:20,528 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 08:11:20,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:11:20,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 08:11:20,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=2082, Unknown=1, NotChecked=92, Total=2352 [2022-11-19 08:11:20,530 INFO L87 Difference]: Start difference. First operand 19145 states and 25839 transitions. Second operand has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) [2022-11-19 08:11:41,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:11:41,195 INFO L93 Difference]: Finished difference Result 21874 states and 29417 transitions. [2022-11-19 08:11:41,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-19 08:11:41,196 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) Word has length 370 [2022-11-19 08:11:41,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:11:41,261 INFO L225 Difference]: With dead ends: 21874 [2022-11-19 08:11:41,262 INFO L226 Difference]: Without dead ends: 19755 [2022-11-19 08:11:41,274 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 776 GetRequests, 727 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 673 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=184, Invalid=2171, Unknown=1, NotChecked=94, Total=2450 [2022-11-19 08:11:41,274 INFO L413 NwaCegarLoop]: 174 mSDtfsCounter, 125 mSDsluCounter, 1916 mSDsCounter, 0 mSdLazyCounter, 2414 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 2090 SdHoareTripleChecker+Invalid, 2660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 2414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 184 IncrementalHoareTripleChecker+Unchecked, 11.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:11:41,275 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 2090 Invalid, 2660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 2414 Invalid, 0 Unknown, 184 Unchecked, 11.7s Time] [2022-11-19 08:11:41,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19755 states. [2022-11-19 08:11:50,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19755 to 18800. [2022-11-19 08:11:50,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18800 states, 14120 states have (on average 1.1419971671388103) internal successors, (16125), 14235 states have internal predecessors, (16125), 4631 states have call successors, (4631), 49 states have call predecessors, (4631), 48 states have return successors, (4630), 4515 states have call predecessors, (4630), 4630 states have call successors, (4630) [2022-11-19 08:11:50,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18800 states to 18800 states and 25386 transitions. [2022-11-19 08:11:50,923 INFO L78 Accepts]: Start accepts. Automaton has 18800 states and 25386 transitions. Word has length 370 [2022-11-19 08:11:50,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:11:50,923 INFO L495 AbstractCegarLoop]: Abstraction has 18800 states and 25386 transitions. [2022-11-19 08:11:50,924 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) [2022-11-19 08:11:50,924 INFO L276 IsEmpty]: Start isEmpty. Operand 18800 states and 25386 transitions. [2022-11-19 08:11:50,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-19 08:11:50,978 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:11:50,978 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:11:50,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-19 08:11:51,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-19 08:11:51,186 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:11:51,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:11:51,187 INFO L85 PathProgramCache]: Analyzing trace with hash 407104466, now seen corresponding path program 13 times [2022-11-19 08:11:51,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:11:51,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575385077] [2022-11-19 08:11:51,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:11:51,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:11:51,205 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:11:51,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1613553893] [2022-11-19 08:11:51,206 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:11:51,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:11:51,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:11:51,207 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:11:51,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-19 08:11:51,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:11:51,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 91 conjunts are in the unsatisfiable core [2022-11-19 08:11:51,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:11:53,053 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 138 proven. 5130 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 08:11:53,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:11:54,998 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 138 proven. 1346 refuted. 0 times theorem prover too weak. 3786 trivial. 0 not checked. [2022-11-19 08:11:54,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:11:54,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575385077] [2022-11-19 08:11:54,999 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:11:54,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613553893] [2022-11-19 08:11:54,999 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613553893] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:11:54,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [535624240] [2022-11-19 08:11:55,001 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:11:55,001 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:11:55,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:11:55,002 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:11:55,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:11:59,162 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-19 08:11:59,167 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 08:11:59,201 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:12:10,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '314696#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 54) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:12:10,297 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:12:10,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:12:10,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 48] total 54 [2022-11-19 08:12:10,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823391347] [2022-11-19 08:12:10,297 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:12:10,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-19 08:12:10,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:12:10,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-19 08:12:10,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1673, Invalid=4027, Unknown=0, NotChecked=0, Total=5700 [2022-11-19 08:12:10,300 INFO L87 Difference]: Start difference. First operand 18800 states and 25386 transitions. Second operand has 54 states, 54 states have (on average 6.203703703703703) internal successors, (335), 54 states have internal predecessors, (335), 51 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 50 states have call predecessors, (92), 50 states have call successors, (92) [2022-11-19 08:12:24,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:24,991 INFO L93 Difference]: Finished difference Result 23239 states and 32253 transitions. [2022-11-19 08:12:24,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2022-11-19 08:12:24,992 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 6.203703703703703) internal successors, (335), 54 states have internal predecessors, (335), 51 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 50 states have call predecessors, (92), 50 states have call successors, (92) Word has length 370 [2022-11-19 08:12:24,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:25,056 INFO L225 Difference]: With dead ends: 23239 [2022-11-19 08:12:25,056 INFO L226 Difference]: Without dead ends: 23120 [2022-11-19 08:12:25,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1156 GetRequests, 994 SyntacticMatches, 40 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4641 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=4165, Invalid=11087, Unknown=0, NotChecked=0, Total=15252 [2022-11-19 08:12:25,066 INFO L413 NwaCegarLoop]: 168 mSDtfsCounter, 1900 mSDsluCounter, 870 mSDsCounter, 0 mSdLazyCounter, 752 mSolverCounterSat, 1221 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1900 SdHoareTripleChecker+Valid, 1038 SdHoareTripleChecker+Invalid, 1973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1221 IncrementalHoareTripleChecker+Valid, 752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:25,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1900 Valid, 1038 Invalid, 1973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1221 Valid, 752 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-19 08:12:25,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23120 states. [2022-11-19 08:12:36,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23120 to 22584. [2022-11-19 08:12:36,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22584 states, 16970 states have (on average 1.1609310548025928) internal successors, (19701), 17093 states have internal predecessors, (19701), 5561 states have call successors, (5561), 53 states have call predecessors, (5561), 52 states have return successors, (5560), 5437 states have call predecessors, (5560), 5560 states have call successors, (5560) [2022-11-19 08:12:36,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22584 states to 22584 states and 30822 transitions. [2022-11-19 08:12:36,301 INFO L78 Accepts]: Start accepts. Automaton has 22584 states and 30822 transitions. Word has length 370 [2022-11-19 08:12:36,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:36,301 INFO L495 AbstractCegarLoop]: Abstraction has 22584 states and 30822 transitions. [2022-11-19 08:12:36,301 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 6.203703703703703) internal successors, (335), 54 states have internal predecessors, (335), 51 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 50 states have call predecessors, (92), 50 states have call successors, (92) [2022-11-19 08:12:36,301 INFO L276 IsEmpty]: Start isEmpty. Operand 22584 states and 30822 transitions. [2022-11-19 08:12:36,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2022-11-19 08:12:36,352 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:36,353 INFO L195 NwaCegarLoop]: trace histogram [46, 45, 45, 19, 19, 19, 19, 18, 17, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:36,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:36,560 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-19 08:12:36,560 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:36,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:36,560 INFO L85 PathProgramCache]: Analyzing trace with hash 1001946905, now seen corresponding path program 3 times [2022-11-19 08:12:36,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:36,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228016278] [2022-11-19 08:12:36,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:36,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:36,581 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:12:36,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [79281431] [2022-11-19 08:12:36,582 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:12:36,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:36,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:36,592 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:36,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cdbe1a38-ce7d-4caa-a5df-0e5ffbe4ba67/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-19 08:12:36,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:12:36,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:12:36,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 102 conjunts are in the unsatisfiable core [2022-11-19 08:12:36,868 INFO L286 TraceCheckSpWp]: Computing forward predicates...