./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/verifythis/tree_max.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/tree_max.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/config/svcomp-MemCleanup-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c --- 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-5e519f3 [2022-11-03 03:47:09,182 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:47:09,185 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:47:09,235 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:47:09,236 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:47:09,240 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:47:09,242 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:47:09,244 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:47:09,249 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:47:09,257 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:47:09,258 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:47:09,259 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:47:09,260 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:47:09,262 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:47:09,263 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:47:09,265 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:47:09,266 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:47:09,267 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:47:09,269 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:47:09,273 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:47:09,276 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:47:09,277 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:47:09,278 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:47:09,279 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:47:09,284 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:47:09,285 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:47:09,285 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:47:09,286 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:47:09,286 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:47:09,287 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:47:09,288 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:47:09,288 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:47:09,289 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:47:09,290 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:47:09,291 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:47:09,291 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:47:09,291 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:47:09,292 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:47:09,292 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:47:09,293 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:47:09,293 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:47:09,300 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/config/svcomp-MemCleanup-32bit-Taipan_Default.epf [2022-11-03 03:47:09,358 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:47:09,358 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:47:09,358 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:47:09,359 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:47:09,360 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:47:09,360 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:47:09,360 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:47:09,360 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:47:09,360 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:47:09,361 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 03:47:09,362 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:47:09,362 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:47:09,362 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 03:47:09,362 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 03:47:09,362 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:47:09,363 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 03:47:09,363 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 03:47:09,363 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 03:47:09,364 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-03 03:47:09,364 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-03 03:47:09,366 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:47:09,366 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 03:47:09,366 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-03 03:47:09,366 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:47:09,366 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 03:47:09,367 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:47:09,367 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-03 03:47:09,367 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-03 03:47:09,367 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:47:09,368 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-03 03:47:09,368 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 03:47:09,368 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:47:09,368 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:47:09,369 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:47:09,369 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:47:09,370 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:47:09,370 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 03:47:09,370 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:47:09,370 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 03:47:09,370 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 03:47:09,371 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:47:09,371 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_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2022-11-03 03:47:09,655 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:47:09,676 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:47:09,678 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:47:09,680 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:47:09,682 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:47:09,684 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/verifythis/tree_max.c [2022-11-03 03:47:09,753 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data/690fd21d0/0204792679944e5a8c0247bd9c5441b0/FLAG30ad68ee7 [2022-11-03 03:47:10,262 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:47:10,263 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/sv-benchmarks/c/verifythis/tree_max.c [2022-11-03 03:47:10,270 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data/690fd21d0/0204792679944e5a8c0247bd9c5441b0/FLAG30ad68ee7 [2022-11-03 03:47:10,621 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data/690fd21d0/0204792679944e5a8c0247bd9c5441b0 [2022-11-03 03:47:10,625 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:47:10,627 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:47:10,630 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:47:10,631 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:47:10,638 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:47:10,638 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:47:10" (1/1) ... [2022-11-03 03:47:10,639 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ff98571 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:10, skipping insertion in model container [2022-11-03 03:47:10,640 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:47:10" (1/1) ... [2022-11-03 03:47:10,647 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:47:10,664 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:47:10,836 WARN L230 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_55f68b15-c026-46b8-96b4-a9e236a8b64c/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2022-11-03 03:47:10,853 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:47:10,864 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2022-11-03 03:47:10,865 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@778b4fa6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:10, skipping insertion in model container [2022-11-03 03:47:10,865 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:47:10,865 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-11-03 03:47:10,867 INFO L158 Benchmark]: Toolchain (without parser) took 239.41ms. Allocated memory is still 100.7MB. Free memory was 79.2MB in the beginning and 76.3MB in the end (delta: 2.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-11-03 03:47:10,868 INFO L158 Benchmark]: CDTParser took 0.26ms. Allocated memory is still 100.7MB. Free memory is still 73.3MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 03:47:10,869 INFO L158 Benchmark]: CACSL2BoogieTranslator took 235.17ms. Allocated memory is still 100.7MB. Free memory was 79.2MB in the beginning and 76.3MB in the end (delta: 2.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-11-03 03:47:10,870 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26ms. Allocated memory is still 100.7MB. Free memory is still 73.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 235.17ms. Allocated memory is still 100.7MB. Free memory was 79.2MB in the beginning and 76.3MB in the end (delta: 2.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 27]: Unsupported Syntax Found a cast between two array/pointer types of different sizes while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/tree_max.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c --- 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-5e519f3 [2022-11-03 03:47:13,000 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:47:13,003 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:47:13,056 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:47:13,056 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:47:13,060 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:47:13,063 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:47:13,067 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:47:13,072 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:47:13,080 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:47:13,081 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:47:13,082 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:47:13,083 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:47:13,085 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:47:13,086 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:47:13,088 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:47:13,089 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:47:13,090 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:47:13,092 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:47:13,098 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:47:13,101 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:47:13,103 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:47:13,107 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:47:13,108 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:47:13,117 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:47:13,119 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:47:13,119 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:47:13,120 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:47:13,122 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:47:13,123 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:47:13,124 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:47:13,124 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:47:13,126 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:47:13,127 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:47:13,128 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:47:13,128 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:47:13,129 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:47:13,130 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:47:13,130 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:47:13,132 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:47:13,133 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:47:13,133 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf [2022-11-03 03:47:13,165 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:47:13,165 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:47:13,166 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:47:13,166 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:47:13,167 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:47:13,167 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:47:13,167 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:47:13,168 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:47:13,168 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:47:13,168 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:47:13,169 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:47:13,169 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:47:13,171 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-03 03:47:13,171 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-03 03:47:13,172 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:47:13,172 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 03:47:13,172 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-03 03:47:13,172 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:47:13,172 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 03:47:13,173 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:47:13,173 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-03 03:47:13,173 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-03 03:47:13,173 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:47:13,174 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-03 03:47:13,174 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-11-03 03:47:13,174 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-11-03 03:47:13,174 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 03:47:13,174 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:47:13,175 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:47:13,175 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-03 03:47:13,175 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:47:13,176 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:47:13,176 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:47:13,176 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:47:13,177 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2022-11-03 03:47:13,177 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-11-03 03:47:13,177 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:47:13,177 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-11-03 03:47:13,178 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2022-11-03 03:47:13,579 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:47:13,606 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:47:13,610 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:47:13,611 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:47:13,612 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:47:13,613 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/verifythis/tree_max.c [2022-11-03 03:47:13,685 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data/314cd8c3d/bba6e8f15db1474691316f237ab2ebc7/FLAG13224ad04 [2022-11-03 03:47:14,239 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:47:14,240 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/sv-benchmarks/c/verifythis/tree_max.c [2022-11-03 03:47:14,247 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data/314cd8c3d/bba6e8f15db1474691316f237ab2ebc7/FLAG13224ad04 [2022-11-03 03:47:14,604 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/data/314cd8c3d/bba6e8f15db1474691316f237ab2ebc7 [2022-11-03 03:47:14,609 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:47:14,611 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:47:14,618 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:47:14,619 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:47:14,623 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:47:14,625 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:14,629 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59fce7ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14, skipping insertion in model container [2022-11-03 03:47:14,629 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:14,636 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:47:14,657 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:47:14,787 WARN L230 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_55f68b15-c026-46b8-96b4-a9e236a8b64c/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2022-11-03 03:47:14,805 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:47:14,819 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-11-03 03:47:14,822 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:47:14,826 WARN L230 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_55f68b15-c026-46b8-96b4-a9e236a8b64c/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2022-11-03 03:47:14,833 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:47:14,839 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 03:47:14,871 WARN L230 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_55f68b15-c026-46b8-96b4-a9e236a8b64c/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2022-11-03 03:47:14,879 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:47:14,918 INFO L208 MainTranslator]: Completed translation [2022-11-03 03:47:14,918 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14 WrapperNode [2022-11-03 03:47:14,918 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:47:14,919 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 03:47:14,919 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 03:47:14,919 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 03:47:14,925 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:14,938 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:14,964 INFO L138 Inliner]: procedures = 26, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 37 [2022-11-03 03:47:14,966 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 03:47:14,967 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 03:47:14,968 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 03:47:14,968 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 03:47:14,977 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:14,978 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:14,996 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:14,997 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:15,006 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:15,023 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:15,025 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:15,027 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:15,029 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 03:47:15,034 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 03:47:15,034 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 03:47:15,034 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 03:47:15,035 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (1/1) ... [2022-11-03 03:47:15,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:47:15,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:47:15,065 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 03:47:15,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 03:47:15,115 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 03:47:15,115 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-11-03 03:47:15,116 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-03 03:47:15,116 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-11-03 03:47:15,116 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-03 03:47:15,116 INFO L130 BoogieDeclarations]: Found specification of procedure max [2022-11-03 03:47:15,116 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2022-11-03 03:47:15,116 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2022-11-03 03:47:15,116 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2022-11-03 03:47:15,117 INFO L130 BoogieDeclarations]: Found specification of procedure check [2022-11-03 03:47:15,117 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2022-11-03 03:47:15,117 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-03 03:47:15,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 03:47:15,117 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 03:47:15,117 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-11-03 03:47:15,229 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 03:47:15,231 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 03:47:15,795 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 03:47:15,810 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 03:47:15,814 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-03 03:47:15,816 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:47:15 BoogieIcfgContainer [2022-11-03 03:47:15,817 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 03:47:15,819 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 03:47:15,820 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 03:47:15,823 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 03:47:15,823 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 03:47:14" (1/3) ... [2022-11-03 03:47:15,824 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38f1a725 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:47:15, skipping insertion in model container [2022-11-03 03:47:15,824 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:47:14" (2/3) ... [2022-11-03 03:47:15,825 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38f1a725 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:47:15, skipping insertion in model container [2022-11-03 03:47:15,825 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:47:15" (3/3) ... [2022-11-03 03:47:15,827 INFO L112 eAbstractionObserver]: Analyzing ICFG tree_max.c [2022-11-03 03:47:15,851 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 03:47:15,851 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 20 error locations. [2022-11-03 03:47:15,923 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 03:47:15,935 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@54755a8e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 03:47:15,935 INFO L358 AbstractCegarLoop]: Starting to check reachability of 20 error locations. [2022-11-03 03:47:15,953 INFO L276 IsEmpty]: Start isEmpty. Operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 03:47:15,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-03 03:47:15,964 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:15,965 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-03 03:47:15,966 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:15,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:15,973 INFO L85 PathProgramCache]: Analyzing trace with hash 73597257, now seen corresponding path program 1 times [2022-11-03 03:47:15,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:15,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1456367652] [2022-11-03 03:47:15,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:15,988 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:15,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:15,994 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:16,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-11-03 03:47:16,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:16,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 03:47:16,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:16,189 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:47:16,232 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:16,233 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:47:16,234 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:16,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1456367652] [2022-11-03 03:47:16,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1456367652] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:47:16,235 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:47:16,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:47:16,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254760724] [2022-11-03 03:47:16,238 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:47:16,244 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:47:16,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:16,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:47:16,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:47:16,288 INFO L87 Difference]: Start difference. First operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:16,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:16,474 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2022-11-03 03:47:16,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:47:16,477 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-03 03:47:16,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:16,492 INFO L225 Difference]: With dead ends: 73 [2022-11-03 03:47:16,492 INFO L226 Difference]: Without dead ends: 71 [2022-11-03 03:47:16,494 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:47:16,498 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 6 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:16,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 133 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:47:16,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-03 03:47:16,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2022-11-03 03:47:16,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 38 states have (on average 1.631578947368421) internal successors, (62), 56 states have internal predecessors, (62), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 03:47:16,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 80 transitions. [2022-11-03 03:47:16,564 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 80 transitions. Word has length 5 [2022-11-03 03:47:16,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:16,566 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 80 transitions. [2022-11-03 03:47:16,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:16,567 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 80 transitions. [2022-11-03 03:47:16,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-03 03:47:16,569 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:16,569 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-03 03:47:16,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:16,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:47:16,782 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:16,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:16,783 INFO L85 PathProgramCache]: Analyzing trace with hash 73597258, now seen corresponding path program 1 times [2022-11-03 03:47:16,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:16,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1506899453] [2022-11-03 03:47:16,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:16,785 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:16,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:16,786 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:16,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-11-03 03:47:16,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:16,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 03:47:16,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:16,878 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:47:16,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:16,898 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:47:16,899 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:16,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1506899453] [2022-11-03 03:47:16,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1506899453] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:47:16,904 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:47:16,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:47:16,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114055059] [2022-11-03 03:47:16,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:47:16,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:47:16,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:16,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:47:16,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:47:16,908 INFO L87 Difference]: Start difference. First operand 69 states and 80 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:17,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:17,043 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2022-11-03 03:47:17,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:47:17,046 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-03 03:47:17,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:17,047 INFO L225 Difference]: With dead ends: 68 [2022-11-03 03:47:17,047 INFO L226 Difference]: Without dead ends: 68 [2022-11-03 03:47:17,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:47:17,049 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 2 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:17,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 132 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:47:17,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-03 03:47:17,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-11-03 03:47:17,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 38 states have (on average 1.605263157894737) internal successors, (61), 55 states have internal predecessors, (61), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 03:47:17,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2022-11-03 03:47:17,068 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 5 [2022-11-03 03:47:17,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:17,069 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2022-11-03 03:47:17,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:47:17,069 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2022-11-03 03:47:17,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 03:47:17,070 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:17,070 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:17,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:17,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:47:17,278 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:17,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:17,279 INFO L85 PathProgramCache]: Analyzing trace with hash -345289291, now seen corresponding path program 1 times [2022-11-03 03:47:17,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:17,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [874274137] [2022-11-03 03:47:17,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:17,280 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:17,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:17,287 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:17,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-11-03 03:47:17,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:17,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 03:47:17,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:17,544 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:17,544 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:47:17,545 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:17,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [874274137] [2022-11-03 03:47:17,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [874274137] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:47:17,546 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:47:17,546 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-03 03:47:17,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349490094] [2022-11-03 03:47:17,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:47:17,547 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 03:47:17,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:17,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 03:47:17,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:47:17,548 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 03:47:17,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:17,690 INFO L93 Difference]: Finished difference Result 83 states and 98 transitions. [2022-11-03 03:47:17,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 03:47:17,691 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-11-03 03:47:17,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:17,692 INFO L225 Difference]: With dead ends: 83 [2022-11-03 03:47:17,693 INFO L226 Difference]: Without dead ends: 83 [2022-11-03 03:47:17,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-11-03 03:47:17,694 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 11 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:17,695 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 432 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:47:17,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-11-03 03:47:17,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 76. [2022-11-03 03:47:17,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 61 states have internal predecessors, (66), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2022-11-03 03:47:17,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2022-11-03 03:47:17,712 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 11 [2022-11-03 03:47:17,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:17,712 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2022-11-03 03:47:17,712 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 03:47:17,713 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2022-11-03 03:47:17,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 03:47:17,713 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:17,714 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:17,725 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2022-11-03 03:47:17,925 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:47:17,925 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:17,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:17,926 INFO L85 PathProgramCache]: Analyzing trace with hash -159104294, now seen corresponding path program 1 times [2022-11-03 03:47:17,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:17,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1656620573] [2022-11-03 03:47:17,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:17,927 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:17,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:17,931 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:17,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-11-03 03:47:17,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:18,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 03:47:18,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:18,009 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:47:18,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:18,044 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:47:18,044 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:18,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1656620573] [2022-11-03 03:47:18,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1656620573] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:47:18,045 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:47:18,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:47:18,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258358755] [2022-11-03 03:47:18,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:47:18,046 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:47:18,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:18,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:47:18,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:47:18,047 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 03:47:18,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:18,317 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2022-11-03 03:47:18,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:47:18,318 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-11-03 03:47:18,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:18,319 INFO L225 Difference]: With dead ends: 80 [2022-11-03 03:47:18,319 INFO L226 Difference]: Without dead ends: 80 [2022-11-03 03:47:18,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:47:18,320 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 49 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:18,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 72 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:47:18,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-03 03:47:18,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2022-11-03 03:47:18,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 61 states have internal predecessors, (70), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2022-11-03 03:47:18,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2022-11-03 03:47:18,340 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 11 [2022-11-03 03:47:18,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:18,341 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2022-11-03 03:47:18,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 03:47:18,341 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2022-11-03 03:47:18,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 03:47:18,342 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:18,346 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:18,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:18,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:47:18,557 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:18,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:18,558 INFO L85 PathProgramCache]: Analyzing trace with hash -159104293, now seen corresponding path program 1 times [2022-11-03 03:47:18,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:18,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1503735326] [2022-11-03 03:47:18,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:18,559 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:18,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:18,560 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:18,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-11-03 03:47:18,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:18,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 03:47:18,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:18,638 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:47:18,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:18,688 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:47:18,688 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:18,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1503735326] [2022-11-03 03:47:18,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1503735326] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:47:18,689 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:47:18,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:47:18,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019662160] [2022-11-03 03:47:18,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:47:18,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:47:18,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:18,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:47:18,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:47:18,691 INFO L87 Difference]: Start difference. First operand 78 states and 93 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 03:47:18,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:18,998 INFO L93 Difference]: Finished difference Result 84 states and 103 transitions. [2022-11-03 03:47:18,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:47:18,999 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-11-03 03:47:18,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:19,000 INFO L225 Difference]: With dead ends: 84 [2022-11-03 03:47:19,000 INFO L226 Difference]: Without dead ends: 84 [2022-11-03 03:47:19,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:47:19,001 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 47 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:19,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 83 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:47:19,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-03 03:47:19,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2022-11-03 03:47:19,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 47 states have (on average 1.5106382978723405) internal successors, (71), 63 states have internal predecessors, (71), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (15), 13 states have call predecessors, (15), 11 states have call successors, (15) [2022-11-03 03:47:19,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 97 transitions. [2022-11-03 03:47:19,009 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 97 transitions. Word has length 11 [2022-11-03 03:47:19,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:19,009 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 97 transitions. [2022-11-03 03:47:19,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 03:47:19,010 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 97 transitions. [2022-11-03 03:47:19,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-03 03:47:19,019 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:19,019 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:19,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:19,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:47:19,231 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting checkErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:19,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:19,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1041946460, now seen corresponding path program 1 times [2022-11-03 03:47:19,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:19,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1102940395] [2022-11-03 03:47:19,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:19,233 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:19,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:19,233 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:19,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-11-03 03:47:19,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:19,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 03:47:19,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:19,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:19,401 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:47:19,401 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:19,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1102940395] [2022-11-03 03:47:19,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1102940395] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:47:19,402 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:47:19,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-03 03:47:19,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300992786] [2022-11-03 03:47:19,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:47:19,403 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 03:47:19,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:19,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 03:47:19,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:47:19,404 INFO L87 Difference]: Start difference. First operand 81 states and 97 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:47:19,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:19,533 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2022-11-03 03:47:19,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 03:47:19,534 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2022-11-03 03:47:19,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:19,535 INFO L225 Difference]: With dead ends: 92 [2022-11-03 03:47:19,535 INFO L226 Difference]: Without dead ends: 92 [2022-11-03 03:47:19,535 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-11-03 03:47:19,536 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 10 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:19,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 432 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:47:19,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-03 03:47:19,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 87. [2022-11-03 03:47:19,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 67 states have internal predecessors, (75), 12 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (16), 14 states have call predecessors, (16), 12 states have call successors, (16) [2022-11-03 03:47:19,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 103 transitions. [2022-11-03 03:47:19,546 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 103 transitions. Word has length 17 [2022-11-03 03:47:19,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:19,546 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 103 transitions. [2022-11-03 03:47:19,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:47:19,547 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 103 transitions. [2022-11-03 03:47:19,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-03 03:47:19,547 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:19,548 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:19,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:19,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:47:19,754 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:19,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:19,755 INFO L85 PathProgramCache]: Analyzing trace with hash -868680531, now seen corresponding path program 1 times [2022-11-03 03:47:19,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:19,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1997720508] [2022-11-03 03:47:19,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:19,756 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:19,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:19,757 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:19,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-11-03 03:47:19,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:19,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 03:47:19,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:19,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:47:19,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:47:19,853 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:19,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1997720508] [2022-11-03 03:47:19,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1997720508] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:47:19,856 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:47:19,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:47:19,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462645515] [2022-11-03 03:47:19,857 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:47:19,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:47:19,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:19,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:47:19,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:47:19,859 INFO L87 Difference]: Start difference. First operand 87 states and 103 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-03 03:47:20,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:20,118 INFO L93 Difference]: Finished difference Result 89 states and 104 transitions. [2022-11-03 03:47:20,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:47:20,118 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2022-11-03 03:47:20,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:20,120 INFO L225 Difference]: With dead ends: 89 [2022-11-03 03:47:20,120 INFO L226 Difference]: Without dead ends: 75 [2022-11-03 03:47:20,120 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:47:20,122 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 42 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:20,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 82 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:47:20,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-03 03:47:20,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-11-03 03:47:20,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 43 states have (on average 1.558139534883721) internal successors, (67), 59 states have internal predecessors, (67), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2022-11-03 03:47:20,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-03 03:47:20,133 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 20 [2022-11-03 03:47:20,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:20,134 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-03 03:47:20,134 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-03 03:47:20,134 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-03 03:47:20,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 03:47:20,135 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:20,135 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:20,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:20,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:47:20,338 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:20,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:20,339 INFO L85 PathProgramCache]: Analyzing trace with hash -360622958, now seen corresponding path program 1 times [2022-11-03 03:47:20,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:20,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [508856199] [2022-11-03 03:47:20,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:20,342 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:20,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:20,343 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:20,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-11-03 03:47:20,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:20,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 03:47:20,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:20,634 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:47:20,904 INFO L356 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-03 03:47:20,904 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 27 [2022-11-03 03:47:20,915 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 03:47:20,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:21,122 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:21,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [508856199] [2022-11-03 03:47:21,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [508856199] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:21,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1056686276] [2022-11-03 03:47:21,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:21,123 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:47:21,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:47:21,126 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:47:21,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2022-11-03 03:47:21,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:21,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 03:47:21,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:21,418 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:47:23,586 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-03 03:47:23,587 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2022-11-03 03:47:23,607 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 03:47:23,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:23,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1056686276] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:23,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095327803] [2022-11-03 03:47:23,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:23,791 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:23,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:47:23,794 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:47:23,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 03:47:23,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:23,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 03:47:23,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:23,928 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:47:26,050 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-03 03:47:26,050 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2022-11-03 03:47:26,071 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 03:47:26,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:26,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095327803] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:26,232 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:47:26,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 5] total 6 [2022-11-03 03:47:26,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754150285] [2022-11-03 03:47:26,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:26,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 03:47:26,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:26,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 03:47:26,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56 [2022-11-03 03:47:26,234 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-03 03:47:36,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:36,623 INFO L93 Difference]: Finished difference Result 84 states and 105 transitions. [2022-11-03 03:47:36,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:47:36,626 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 29 [2022-11-03 03:47:36,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:36,627 INFO L225 Difference]: With dead ends: 84 [2022-11-03 03:47:36,627 INFO L226 Difference]: Without dead ends: 84 [2022-11-03 03:47:36,627 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 89 SyntacticMatches, 10 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=38, Invalid=70, Unknown=2, NotChecked=0, Total=110 [2022-11-03 03:47:36,628 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 48 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 185 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:36,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 114 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 97 Invalid, 0 Unknown, 185 Unchecked, 0.2s Time] [2022-11-03 03:47:36,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-03 03:47:36,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 79. [2022-11-03 03:47:36,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 46 states have (on average 1.5434782608695652) internal successors, (71), 62 states have internal predecessors, (71), 10 states have call successors, (10), 3 states have call predecessors, (10), 5 states have return successors, (17), 13 states have call predecessors, (17), 10 states have call successors, (17) [2022-11-03 03:47:36,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 98 transitions. [2022-11-03 03:47:36,645 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 98 transitions. Word has length 29 [2022-11-03 03:47:36,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:36,646 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 98 transitions. [2022-11-03 03:47:36,646 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-03 03:47:36,646 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 98 transitions. [2022-11-03 03:47:36,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-03 03:47:36,648 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:36,648 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:36,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:36,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:37,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:37,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:47:37,263 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:37,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:37,263 INFO L85 PathProgramCache]: Analyzing trace with hash 1828073473, now seen corresponding path program 1 times [2022-11-03 03:47:37,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:37,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [555308133] [2022-11-03 03:47:37,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:37,264 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:37,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:37,264 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:37,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-11-03 03:47:37,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:37,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 03:47:37,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:37,548 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:47:37,560 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:47:41,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:47:41,855 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:47:41,873 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:47:41,873 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:47:41,901 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 03:47:41,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:42,986 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:42,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [555308133] [2022-11-03 03:47:42,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [555308133] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:42,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1579871252] [2022-11-03 03:47:42,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:42,987 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:47:42,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:47:42,995 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:47:42,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2022-11-03 03:47:43,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:43,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 03:47:43,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:43,349 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:47:43,355 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:47:49,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:47:49,606 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:47:49,630 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:47:49,630 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:47:49,638 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 03:47:49,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:50,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1579871252] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:50,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902992291] [2022-11-03 03:47:50,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:50,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:50,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:47:50,295 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:47:50,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 03:47:50,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:50,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 03:47:50,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:50,442 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:47:54,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:47:54,686 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:47:54,699 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:47:54,700 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:47:54,705 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 03:47:54,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:56,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902992291] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:47:56,945 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:47:56,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2022-11-03 03:47:56,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679825780] [2022-11-03 03:47:56,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:56,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 03:47:56,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:56,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 03:47:56,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-11-03 03:47:56,946 INFO L87 Difference]: Start difference. First operand 79 states and 98 transitions. Second operand has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 03:47:57,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:47:57,373 INFO L93 Difference]: Finished difference Result 98 states and 130 transitions. [2022-11-03 03:47:57,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 03:47:57,375 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 35 [2022-11-03 03:47:57,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:47:57,376 INFO L225 Difference]: With dead ends: 98 [2022-11-03 03:47:57,376 INFO L226 Difference]: Without dead ends: 98 [2022-11-03 03:47:57,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 92 SyntacticMatches, 10 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-11-03 03:47:57,377 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 93 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:47:57,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 114 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 171 Invalid, 0 Unknown, 96 Unchecked, 0.4s Time] [2022-11-03 03:47:57,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-03 03:47:57,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 95. [2022-11-03 03:47:57,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 57 states have (on average 1.4385964912280702) internal successors, (82), 74 states have internal predecessors, (82), 13 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (26), 16 states have call predecessors, (26), 13 states have call successors, (26) [2022-11-03 03:47:57,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2022-11-03 03:47:57,400 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 35 [2022-11-03 03:47:57,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:47:57,401 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2022-11-03 03:47:57,401 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 03:47:57,401 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2022-11-03 03:47:57,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-03 03:47:57,402 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:47:57,402 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:47:57,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:57,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:57,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-11-03 03:47:58,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:47:58,004 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:47:58,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:47:58,004 INFO L85 PathProgramCache]: Analyzing trace with hash -694882647, now seen corresponding path program 1 times [2022-11-03 03:47:58,005 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:47:58,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1441204827] [2022-11-03 03:47:58,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:58,005 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:47:58,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:47:58,006 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:47:58,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-11-03 03:47:58,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:58,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 03:47:58,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:58,125 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:47:58,262 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:47:58,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:58,537 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:47:58,537 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:47:58,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1441204827] [2022-11-03 03:47:58,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1441204827] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:58,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1415269703] [2022-11-03 03:47:58,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:58,538 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:47:58,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:47:58,540 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:47:58,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2022-11-03 03:47:58,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:58,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 03:47:58,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:58,739 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:47:58,816 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:47:58,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:59,071 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:47:59,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1415269703] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:59,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213825779] [2022-11-03 03:47:59,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:47:59,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:47:59,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:47:59,073 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:47:59,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 03:47:59,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:47:59,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 03:47:59,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:47:59,239 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:47:59,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:47:59,400 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:47:59,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213825779] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:47:59,400 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:47:59,400 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 9 [2022-11-03 03:47:59,401 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356998800] [2022-11-03 03:47:59,401 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:47:59,401 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 03:47:59,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:47:59,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 03:47:59,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2022-11-03 03:47:59,402 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand has 10 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-03 03:48:00,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:00,003 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2022-11-03 03:48:00,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 03:48:00,003 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 25 [2022-11-03 03:48:00,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:00,005 INFO L225 Difference]: With dead ends: 116 [2022-11-03 03:48:00,005 INFO L226 Difference]: Without dead ends: 114 [2022-11-03 03:48:00,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 133 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2022-11-03 03:48:00,006 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 52 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:00,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 302 Invalid, 377 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 288 Invalid, 0 Unknown, 75 Unchecked, 0.5s Time] [2022-11-03 03:48:00,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-11-03 03:48:00,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2022-11-03 03:48:00,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 69 states have (on average 1.4202898550724639) internal successors, (98), 83 states have internal predecessors, (98), 15 states have call successors, (15), 6 states have call predecessors, (15), 8 states have return successors, (28), 18 states have call predecessors, (28), 15 states have call successors, (28) [2022-11-03 03:48:00,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 141 transitions. [2022-11-03 03:48:00,043 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 141 transitions. Word has length 25 [2022-11-03 03:48:00,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:00,043 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 141 transitions. [2022-11-03 03:48:00,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-03 03:48:00,043 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 141 transitions. [2022-11-03 03:48:00,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-03 03:48:00,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:00,044 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:48:00,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:00,253 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:00,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:00,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:00,646 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:48:00,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:00,646 INFO L85 PathProgramCache]: Analyzing trace with hash -694882646, now seen corresponding path program 1 times [2022-11-03 03:48:00,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:48:00,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [295737370] [2022-11-03 03:48:00,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:00,647 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:48:00,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:48:00,648 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:48:00,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2022-11-03 03:48:00,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:00,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 03:48:00,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:00,771 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:48:01,007 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:48:01,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:02,628 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:48:02,629 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:48:02,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [295737370] [2022-11-03 03:48:02,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [295737370] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:02,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1278298722] [2022-11-03 03:48:02,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:02,629 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:48:02,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:48:02,631 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:48:02,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2022-11-03 03:48:02,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:02,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 03:48:02,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:02,834 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:48:02,952 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:48:02,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:04,022 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:48:04,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1278298722] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:04,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391728290] [2022-11-03 03:48:04,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:04,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:04,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:48:04,024 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:48:04,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 03:48:04,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:04,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 03:48:04,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:04,149 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:48:04,275 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:48:04,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:05,077 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:48:05,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391728290] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:05,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:48:05,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2022-11-03 03:48:05,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457273961] [2022-11-03 03:48:05,078 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:48:05,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 03:48:05,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:48:05,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 03:48:05,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2022-11-03 03:48:05,080 INFO L87 Difference]: Start difference. First operand 108 states and 141 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-03 03:48:07,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:07,881 INFO L93 Difference]: Finished difference Result 133 states and 176 transitions. [2022-11-03 03:48:07,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 03:48:07,883 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 25 [2022-11-03 03:48:07,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:07,884 INFO L225 Difference]: With dead ends: 133 [2022-11-03 03:48:07,884 INFO L226 Difference]: Without dead ends: 133 [2022-11-03 03:48:07,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 125 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2022-11-03 03:48:07,885 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 113 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 752 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:07,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 171 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 752 Invalid, 0 Unknown, 21 Unchecked, 2.6s Time] [2022-11-03 03:48:07,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-11-03 03:48:07,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 124. [2022-11-03 03:48:07,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 81 states have (on average 1.3950617283950617) internal successors, (113), 95 states have internal predecessors, (113), 18 states have call successors, (18), 7 states have call predecessors, (18), 9 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2022-11-03 03:48:07,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2022-11-03 03:48:07,894 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 25 [2022-11-03 03:48:07,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:07,895 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2022-11-03 03:48:07,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-03 03:48:07,895 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2022-11-03 03:48:07,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 03:48:07,897 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:07,897 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:48:07,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:08,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:08,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:08,501 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:48:08,501 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting checkErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:48:08,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:08,502 INFO L85 PathProgramCache]: Analyzing trace with hash 986137240, now seen corresponding path program 1 times [2022-11-03 03:48:08,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:48:08,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [961892546] [2022-11-03 03:48:08,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:08,502 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:48:08,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:48:08,503 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:48:08,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2022-11-03 03:48:08,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:08,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 03:48:08,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:08,723 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 03:48:08,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:48:08,723 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:48:08,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [961892546] [2022-11-03 03:48:08,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [961892546] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:48:08,724 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:48:08,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-03 03:48:08,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770250063] [2022-11-03 03:48:08,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:48:08,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 03:48:08,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:48:08,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 03:48:08,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-03 03:48:08,725 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 03:48:09,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:09,070 INFO L93 Difference]: Finished difference Result 130 states and 171 transitions. [2022-11-03 03:48:09,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 03:48:09,071 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2022-11-03 03:48:09,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:09,072 INFO L225 Difference]: With dead ends: 130 [2022-11-03 03:48:09,072 INFO L226 Difference]: Without dead ends: 126 [2022-11-03 03:48:09,073 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-11-03 03:48:09,073 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 29 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:09,073 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 357 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:48:09,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-03 03:48:09,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2022-11-03 03:48:09,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 81 states have (on average 1.3703703703703705) internal successors, (111), 95 states have internal predecessors, (111), 18 states have call successors, (18), 7 states have call predecessors, (18), 9 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2022-11-03 03:48:09,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 160 transitions. [2022-11-03 03:48:09,093 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 160 transitions. Word has length 31 [2022-11-03 03:48:09,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:09,094 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 160 transitions. [2022-11-03 03:48:09,094 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 03:48:09,094 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 160 transitions. [2022-11-03 03:48:09,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 03:48:09,103 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:09,103 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-11-03 03:48:09,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:09,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:48:09,315 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:48:09,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:09,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1746105865, now seen corresponding path program 1 times [2022-11-03 03:48:09,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:48:09,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1927703257] [2022-11-03 03:48:09,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:09,316 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:48:09,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:48:09,319 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:48:09,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2022-11-03 03:48:09,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:09,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-03 03:48:09,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:09,543 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:48:09,552 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:48:09,652 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:48:09,667 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:48:09,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-11-03 03:48:09,950 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-11-03 03:48:10,081 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:48:10,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:13,104 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:48:13,105 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:48:13,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1927703257] [2022-11-03 03:48:13,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1927703257] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:13,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [115891102] [2022-11-03 03:48:13,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:13,105 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:48:13,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:48:13,111 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:48:13,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2022-11-03 03:48:13,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:13,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-03 03:48:13,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:13,520 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:48:13,527 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:48:13,673 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:48:13,686 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:48:14,121 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:48:14,124 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:48:14,144 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:48:14,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:15,268 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:48:15,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [115891102] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:15,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [750675852] [2022-11-03 03:48:15,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:15,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:15,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:48:15,270 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:48:15,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 03:48:15,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:15,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-03 03:48:15,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:15,436 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:48:15,443 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:48:15,500 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:48:15,511 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:48:15,624 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:48:15,627 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:48:15,642 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:48:15,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:18,634 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:48:18,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [750675852] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:48:18,635 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:48:18,635 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 15, 14, 15, 14] total 23 [2022-11-03 03:48:18,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541818353] [2022-11-03 03:48:18,635 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:48:18,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-03 03:48:18,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:48:18,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-03 03:48:18,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=453, Unknown=0, NotChecked=0, Total=506 [2022-11-03 03:48:18,637 INFO L87 Difference]: Start difference. First operand 124 states and 160 transitions. Second operand has 23 states, 20 states have (on average 1.95) internal successors, (39), 16 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-03 03:48:21,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:21,010 INFO L93 Difference]: Finished difference Result 135 states and 174 transitions. [2022-11-03 03:48:21,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-03 03:48:21,010 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 1.95) internal successors, (39), 16 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 31 [2022-11-03 03:48:21,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:21,011 INFO L225 Difference]: With dead ends: 135 [2022-11-03 03:48:21,012 INFO L226 Difference]: Without dead ends: 135 [2022-11-03 03:48:21,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 157 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=127, Invalid=995, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 03:48:21,013 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 120 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 1007 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 1064 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 1007 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:21,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 326 Invalid, 1064 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 1007 Invalid, 0 Unknown, 20 Unchecked, 1.9s Time] [2022-11-03 03:48:21,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-11-03 03:48:21,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 128. [2022-11-03 03:48:21,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 84 states have (on average 1.3571428571428572) internal successors, (114), 98 states have internal predecessors, (114), 18 states have call successors, (18), 8 states have call predecessors, (18), 10 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2022-11-03 03:48:21,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 163 transitions. [2022-11-03 03:48:21,022 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 163 transitions. Word has length 31 [2022-11-03 03:48:21,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:21,022 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 163 transitions. [2022-11-03 03:48:21,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 1.95) internal successors, (39), 16 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-03 03:48:21,023 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 163 transitions. [2022-11-03 03:48:21,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 03:48:21,024 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:21,024 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2022-11-03 03:48:21,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:21,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:21,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:21,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:48:21,643 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:48:21,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:21,643 INFO L85 PathProgramCache]: Analyzing trace with hash -914147595, now seen corresponding path program 1 times [2022-11-03 03:48:21,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:48:21,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [463357501] [2022-11-03 03:48:21,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:21,644 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:48:21,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:48:21,645 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:48:21,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2022-11-03 03:48:21,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:21,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 03:48:21,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:21,960 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:48:22,164 INFO L356 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-03 03:48:22,165 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 27 [2022-11-03 03:48:22,169 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-03 03:48:22,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:22,343 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:48:22,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [463357501] [2022-11-03 03:48:22,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [463357501] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:22,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [984133471] [2022-11-03 03:48:22,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:22,344 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:48:22,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:48:22,345 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:48:22,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2022-11-03 03:48:22,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:22,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 03:48:22,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:22,740 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:48:24,868 INFO L356 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-03 03:48:24,868 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2022-11-03 03:48:24,878 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-03 03:48:24,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:25,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [984133471] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:25,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724335553] [2022-11-03 03:48:25,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:25,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:25,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:48:25,059 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:48:25,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-03 03:48:25,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:25,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 03:48:25,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:25,437 INFO L356 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2022-11-03 03:48:25,437 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 27 [2022-11-03 03:48:25,443 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 7 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-03 03:48:25,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:25,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724335553] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:25,594 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:48:25,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2022-11-03 03:48:25,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993279096] [2022-11-03 03:48:25,594 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:48:25,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 03:48:25,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:48:25,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 03:48:25,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2022-11-03 03:48:25,595 INFO L87 Difference]: Start difference. First operand 128 states and 163 transitions. Second operand has 6 states, 5 states have (on average 6.8) internal successors, (34), 6 states have internal predecessors, (34), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 03:48:31,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:31,948 INFO L93 Difference]: Finished difference Result 133 states and 174 transitions. [2022-11-03 03:48:31,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 03:48:31,949 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.8) internal successors, (34), 6 states have internal predecessors, (34), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 45 [2022-11-03 03:48:31,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:31,950 INFO L225 Difference]: With dead ends: 133 [2022-11-03 03:48:31,951 INFO L226 Difference]: Without dead ends: 133 [2022-11-03 03:48:31,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 138 SyntacticMatches, 11 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2022-11-03 03:48:31,952 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 44 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 156 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:31,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 100 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 93 Invalid, 0 Unknown, 156 Unchecked, 0.3s Time] [2022-11-03 03:48:31,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-11-03 03:48:31,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 128. [2022-11-03 03:48:31,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 84 states have (on average 1.3571428571428572) internal successors, (114), 98 states have internal predecessors, (114), 18 states have call successors, (18), 8 states have call predecessors, (18), 10 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2022-11-03 03:48:31,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 163 transitions. [2022-11-03 03:48:31,961 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 163 transitions. Word has length 45 [2022-11-03 03:48:31,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:31,961 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 163 transitions. [2022-11-03 03:48:31,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.8) internal successors, (34), 6 states have internal predecessors, (34), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 03:48:31,962 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 163 transitions. [2022-11-03 03:48:31,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 03:48:31,963 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:31,963 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-03 03:48:31,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:32,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:32,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:32,568 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:48:32,569 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:48:32,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:32,569 INFO L85 PathProgramCache]: Analyzing trace with hash -1427695232, now seen corresponding path program 1 times [2022-11-03 03:48:32,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:48:32,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [530889181] [2022-11-03 03:48:32,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:32,570 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:48:32,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:48:32,571 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:48:32,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2022-11-03 03:48:32,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:32,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 03:48:32,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:32,786 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:48:32,791 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:48:41,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:48:41,079 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:48:41,095 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:48:41,095 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:48:41,122 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:48:41,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:41,403 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:48:41,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [530889181] [2022-11-03 03:48:41,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [530889181] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:41,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1933060106] [2022-11-03 03:48:41,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:41,404 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:48:41,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:48:41,405 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:48:41,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2022-11-03 03:48:41,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:41,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 03:48:41,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:41,745 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:48:41,751 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:48:46,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:48:46,030 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:48:46,052 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:48:46,052 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:48:46,057 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:48:46,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:48,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1933060106] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:48,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102256136] [2022-11-03 03:48:48,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:48:48,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:48:48,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:48:48,299 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:48:48,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-03 03:48:48,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:48:48,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 03:48:48,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:48,458 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:48:54,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:48:54,736 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:48:54,753 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:48:54,753 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:48:54,758 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:48:54,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:48:57,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102256136] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:48:57,012 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:48:57,013 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2022-11-03 03:48:57,013 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758438017] [2022-11-03 03:48:57,013 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:48:57,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 03:48:57,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:48:57,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 03:48:57,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2022-11-03 03:48:57,014 INFO L87 Difference]: Start difference. First operand 128 states and 163 transitions. Second operand has 7 states, 6 states have (on average 4.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-03 03:48:57,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:48:57,420 INFO L93 Difference]: Finished difference Result 132 states and 173 transitions. [2022-11-03 03:48:57,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:48:57,420 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 31 [2022-11-03 03:48:57,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:48:57,422 INFO L225 Difference]: With dead ends: 132 [2022-11-03 03:48:57,422 INFO L226 Difference]: Without dead ends: 132 [2022-11-03 03:48:57,422 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 80 SyntacticMatches, 10 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=27, Invalid=61, Unknown=2, NotChecked=0, Total=90 [2022-11-03 03:48:57,423 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 83 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:48:57,423 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 106 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 156 Invalid, 0 Unknown, 99 Unchecked, 0.4s Time] [2022-11-03 03:48:57,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-11-03 03:48:57,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 128. [2022-11-03 03:48:57,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 84 states have (on average 1.3571428571428572) internal successors, (114), 98 states have internal predecessors, (114), 18 states have call successors, (18), 8 states have call predecessors, (18), 10 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2022-11-03 03:48:57,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 163 transitions. [2022-11-03 03:48:57,430 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 163 transitions. Word has length 31 [2022-11-03 03:48:57,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:48:57,431 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 163 transitions. [2022-11-03 03:48:57,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 7 states have internal predecessors, (24), 4 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-03 03:48:57,431 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 163 transitions. [2022-11-03 03:48:57,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-03 03:48:57,432 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:48:57,432 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2022-11-03 03:48:57,465 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:57,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:57,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2022-11-03 03:48:58,050 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:48:58,051 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:48:58,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:48:58,051 INFO L85 PathProgramCache]: Analyzing trace with hash 1805515892, now seen corresponding path program 2 times [2022-11-03 03:48:58,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:48:58,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1367221125] [2022-11-03 03:48:58,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:48:58,052 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:48:58,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:48:58,053 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:48:58,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2022-11-03 03:48:58,362 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:48:58,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:48:58,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 03:48:58,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:48:58,384 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:49:02,722 INFO L356 Elim1Store]: treesize reduction 52, result has 30.7 percent of original size [2022-11-03 03:49:02,722 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 38 [2022-11-03 03:49:02,737 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-03 03:49:02,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:49:04,959 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:49:04,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1367221125] [2022-11-03 03:49:04,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1367221125] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:49:04,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1054957823] [2022-11-03 03:49:04,960 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:49:04,960 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:49:04,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:49:04,961 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:49:04,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2022-11-03 03:49:05,325 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:49:05,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789667881] [2022-11-03 03:49:05,326 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:49:05,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:49:05,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:49:05,328 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:49:05,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 1 [2022-11-03 03:49:05,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-03 03:49:05,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:49:05,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:49:05,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 03:49:05,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:49:05,587 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:49:15,288 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 03:49:15,343 INFO L356 Elim1Store]: treesize reduction 34, result has 35.8 percent of original size [2022-11-03 03:49:15,343 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 31 [2022-11-03 03:49:15,369 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:49:15,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:49:15,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789667881] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:49:15,703 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 03:49:15,703 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-11-03 03:49:15,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006824467] [2022-11-03 03:49:15,703 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 03:49:15,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 03:49:15,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:49:15,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 03:49:15,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=96, Unknown=5, NotChecked=0, Total=132 [2022-11-03 03:49:15,705 INFO L87 Difference]: Start difference. First operand 128 states and 163 transitions. Second operand has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-03 03:49:34,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:49:34,204 INFO L93 Difference]: Finished difference Result 165 states and 222 transitions. [2022-11-03 03:49:34,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 03:49:34,205 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) Word has length 49 [2022-11-03 03:49:34,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:49:34,207 INFO L225 Difference]: With dead ends: 165 [2022-11-03 03:49:34,207 INFO L226 Difference]: Without dead ends: 165 [2022-11-03 03:49:34,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 91 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 34.1s TimeCoverageRelationStatistics Valid=77, Invalid=184, Unknown=11, NotChecked=0, Total=272 [2022-11-03 03:49:34,208 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 12 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 389 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:49:34,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 211 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 389 Unchecked, 0.1s Time] [2022-11-03 03:49:34,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2022-11-03 03:49:34,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 162. [2022-11-03 03:49:34,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 108 states have (on average 1.3055555555555556) internal successors, (141), 123 states have internal predecessors, (141), 23 states have call successors, (23), 10 states have call predecessors, (23), 15 states have return successors, (53), 28 states have call predecessors, (53), 23 states have call successors, (53) [2022-11-03 03:49:34,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 217 transitions. [2022-11-03 03:49:34,219 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 217 transitions. Word has length 49 [2022-11-03 03:49:34,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:49:34,219 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 217 transitions. [2022-11-03 03:49:34,220 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-03 03:49:34,224 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 217 transitions. [2022-11-03 03:49:34,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-03 03:49:34,225 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:49:34,225 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-11-03 03:49:34,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-03 03:49:34,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2022-11-03 03:49:34,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:49:34,650 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:49:34,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:49:34,651 INFO L85 PathProgramCache]: Analyzing trace with hash 917383077, now seen corresponding path program 2 times [2022-11-03 03:49:34,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:49:34,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1974877716] [2022-11-03 03:49:34,651 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:49:34,651 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:49:34,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:49:34,652 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:49:34,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2022-11-03 03:49:35,007 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:49:35,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:49:35,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 03:49:35,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:49:35,029 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:49:39,431 INFO L356 Elim1Store]: treesize reduction 52, result has 30.7 percent of original size [2022-11-03 03:49:39,431 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 38 [2022-11-03 03:49:39,456 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 34 refuted. 6 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-03 03:49:39,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:49:41,689 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:49:41,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1974877716] [2022-11-03 03:49:41,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1974877716] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:49:41,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1507252633] [2022-11-03 03:49:41,689 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:49:41,689 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:49:41,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:49:41,690 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:49:41,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2022-11-03 03:49:42,093 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:49:42,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941065509] [2022-11-03 03:49:42,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:49:42,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:49:42,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:49:42,095 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:49:42,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-03 03:49:42,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 1 [2022-11-03 03:49:42,333 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:49:42,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:49:42,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 03:49:42,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:49:48,967 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 03:49:49,008 INFO L356 Elim1Store]: treesize reduction 34, result has 35.8 percent of original size [2022-11-03 03:49:49,008 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 31 [2022-11-03 03:49:49,025 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 24 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-03 03:49:49,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:49:49,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941065509] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:49:49,544 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 03:49:49,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2022-11-03 03:49:49,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372315933] [2022-11-03 03:49:49,544 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 03:49:49,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 03:49:49,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:49:49,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 03:49:49,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=125, Unknown=5, NotChecked=0, Total=182 [2022-11-03 03:49:49,546 INFO L87 Difference]: Start difference. First operand 162 states and 217 transitions. Second operand has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2022-11-03 03:49:57,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:49:57,905 INFO L93 Difference]: Finished difference Result 168 states and 234 transitions. [2022-11-03 03:49:57,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 03:49:57,905 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) Word has length 55 [2022-11-03 03:49:57,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:49:57,907 INFO L225 Difference]: With dead ends: 168 [2022-11-03 03:49:57,907 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:49:57,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 100 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 21.0s TimeCoverageRelationStatistics Valid=75, Invalid=159, Unknown=6, NotChecked=0, Total=240 [2022-11-03 03:49:57,908 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 49 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 309 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:49:57,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 124 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 85 Invalid, 0 Unknown, 309 Unchecked, 0.2s Time] [2022-11-03 03:49:57,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:49:57,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2022-11-03 03:49:57,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 111 states have (on average 1.2972972972972974) internal successors, (144), 126 states have internal predecessors, (144), 23 states have call successors, (23), 10 states have call predecessors, (23), 16 states have return successors, (65), 29 states have call predecessors, (65), 23 states have call successors, (65) [2022-11-03 03:49:57,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 232 transitions. [2022-11-03 03:49:57,917 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 232 transitions. Word has length 55 [2022-11-03 03:49:57,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:49:57,918 INFO L495 AbstractCegarLoop]: Abstraction has 166 states and 232 transitions. [2022-11-03 03:49:57,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2022-11-03 03:49:57,918 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 232 transitions. [2022-11-03 03:49:57,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-03 03:49:57,919 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:49:57,919 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-11-03 03:49:57,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-03 03:49:58,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2022-11-03 03:49:58,344 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:49:58,344 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:49:58,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:49:58,345 INFO L85 PathProgramCache]: Analyzing trace with hash 917383078, now seen corresponding path program 2 times [2022-11-03 03:49:58,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:49:58,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1989958155] [2022-11-03 03:49:58,345 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:49:58,345 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:49:58,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:49:58,346 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:49:58,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2022-11-03 03:49:58,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:49:58,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:49:58,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 03:49:58,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:49:58,771 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:49:58,778 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:50:07,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:50:07,345 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-11-03 03:50:07,346 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-11-03 03:50:07,374 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:50:07,374 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:50:07,445 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:50:07,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:50:09,975 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:50:09,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1989958155] [2022-11-03 03:50:09,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1989958155] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:09,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [477476083] [2022-11-03 03:50:09,976 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:50:09,976 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:50:09,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:50:09,977 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:50:09,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2022-11-03 03:50:10,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:50:10,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:50:10,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 03:50:10,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:10,527 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:50:10,536 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:50:15,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:50:15,073 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-11-03 03:50:15,073 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-11-03 03:50:15,099 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:50:15,100 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:50:15,182 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:50:15,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:50:15,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [477476083] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:15,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792588008] [2022-11-03 03:50:15,918 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:50:15,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:15,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:15,920 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:15,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-03 03:50:16,204 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:50:16,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:50:16,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-03 03:50:16,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:16,219 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:50:22,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:50:22,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:50:22,922 INFO L356 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-03 03:50:22,923 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2022-11-03 03:50:22,953 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:50:22,953 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2022-11-03 03:50:23,082 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 53 proven. 50 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:50:23,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:50:43,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792588008] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:43,558 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:50:43,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 10] total 13 [2022-11-03 03:50:43,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173498925] [2022-11-03 03:50:43,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:50:43,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 03:50:43,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:50:43,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 03:50:43,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=213, Unknown=13, NotChecked=0, Total=272 [2022-11-03 03:50:43,560 INFO L87 Difference]: Start difference. First operand 166 states and 232 transitions. Second operand has 14 states, 13 states have (on average 4.3076923076923075) internal successors, (56), 13 states have internal predecessors, (56), 8 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 10 states have call predecessors, (13), 8 states have call successors, (13) [2022-11-03 03:50:53,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:53,716 INFO L93 Difference]: Finished difference Result 167 states and 233 transitions. [2022-11-03 03:50:53,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 03:50:53,718 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 4.3076923076923075) internal successors, (56), 13 states have internal predecessors, (56), 8 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 10 states have call predecessors, (13), 8 states have call successors, (13) Word has length 55 [2022-11-03 03:50:53,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:53,719 INFO L225 Difference]: With dead ends: 167 [2022-11-03 03:50:53,720 INFO L226 Difference]: Without dead ends: 167 [2022-11-03 03:50:53,720 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 147 SyntacticMatches, 7 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 51.5s TimeCoverageRelationStatistics Valid=84, Invalid=280, Unknown=16, NotChecked=0, Total=380 [2022-11-03 03:50:53,721 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 45 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 287 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:53,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 144 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 95 Invalid, 0 Unknown, 287 Unchecked, 0.3s Time] [2022-11-03 03:50:53,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-11-03 03:50:53,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2022-11-03 03:50:53,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 111 states have (on average 1.2972972972972974) internal successors, (144), 126 states have internal predecessors, (144), 23 states have call successors, (23), 10 states have call predecessors, (23), 16 states have return successors, (65), 29 states have call predecessors, (65), 23 states have call successors, (65) [2022-11-03 03:50:53,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 232 transitions. [2022-11-03 03:50:53,730 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 232 transitions. Word has length 55 [2022-11-03 03:50:53,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:53,731 INFO L495 AbstractCegarLoop]: Abstraction has 166 states and 232 transitions. [2022-11-03 03:50:53,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 4.3076923076923075) internal successors, (56), 13 states have internal predecessors, (56), 8 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 10 states have call predecessors, (13), 8 states have call successors, (13) [2022-11-03 03:50:53,731 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 232 transitions. [2022-11-03 03:50:53,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-03 03:50:53,732 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:53,732 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2022-11-03 03:50:53,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:53,950 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:54,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:54,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:54,347 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:50:54,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:54,347 INFO L85 PathProgramCache]: Analyzing trace with hash 1271945509, now seen corresponding path program 3 times [2022-11-03 03:50:54,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:50:54,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [748197376] [2022-11-03 03:50:54,347 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:50:54,347 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:50:54,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:50:54,348 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:50:54,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2022-11-03 03:50:54,774 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 03:50:54,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:50:54,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 03:50:54,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:05,457 INFO L356 Elim1Store]: treesize reduction 52, result has 30.7 percent of original size [2022-11-03 03:51:05,457 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 38 [2022-11-03 03:51:05,477 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 26 refuted. 2 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-03 03:51:05,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:51:06,082 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:51:06,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [748197376] [2022-11-03 03:51:06,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [748197376] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:06,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1419589624] [2022-11-03 03:51:06,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:51:06,083 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:51:06,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:51:06,084 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:51:06,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2022-11-03 03:51:06,516 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:51:06,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542016181] [2022-11-03 03:51:06,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:51:06,517 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:06,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:51:06,518 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:51:06,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-03 03:51:06,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 1 [2022-11-03 03:51:09,087 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 03:51:09,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:51:09,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 03:51:09,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:19,349 INFO L356 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2022-11-03 03:51:19,349 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 31 [2022-11-03 03:51:19,373 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 25 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-03 03:51:19,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:51:19,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542016181] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:19,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 03:51:19,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2022-11-03 03:51:19,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066165652] [2022-11-03 03:51:19,771 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 03:51:19,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 03:51:19,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:51:19,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 03:51:19,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=90, Unknown=4, NotChecked=0, Total=132 [2022-11-03 03:51:19,772 INFO L87 Difference]: Start difference. First operand 166 states and 232 transitions. Second operand has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2022-11-03 03:51:42,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:51:42,335 INFO L93 Difference]: Finished difference Result 207 states and 304 transitions. [2022-11-03 03:51:42,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 03:51:42,336 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) Word has length 55 [2022-11-03 03:51:42,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:51:42,337 INFO L225 Difference]: With dead ends: 207 [2022-11-03 03:51:42,338 INFO L226 Difference]: Without dead ends: 207 [2022-11-03 03:51:42,338 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 105 SyntacticMatches, 13 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 43.2s TimeCoverageRelationStatistics Valid=87, Invalid=173, Unknown=12, NotChecked=0, Total=272 [2022-11-03 03:51:42,338 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 14 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 321 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:51:42,339 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 232 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 321 Unchecked, 0.1s Time] [2022-11-03 03:51:42,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-11-03 03:51:42,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 203. [2022-11-03 03:51:42,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 137 states have (on average 1.2481751824817517) internal successors, (171), 154 states have internal predecessors, (171), 29 states have call successors, (29), 11 states have call predecessors, (29), 21 states have return successors, (99), 37 states have call predecessors, (99), 29 states have call successors, (99) [2022-11-03 03:51:42,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 299 transitions. [2022-11-03 03:51:42,351 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 299 transitions. Word has length 55 [2022-11-03 03:51:42,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:51:42,351 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 299 transitions. [2022-11-03 03:51:42,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2022-11-03 03:51:42,352 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 299 transitions. [2022-11-03 03:51:42,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-03 03:51:42,362 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:51:42,362 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-03 03:51:42,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-03 03:51:42,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2022-11-03 03:51:42,790 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:51:42,790 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:51:42,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:51:42,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1475599677, now seen corresponding path program 2 times [2022-11-03 03:51:42,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:51:42,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1242763620] [2022-11-03 03:51:42,791 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:51:42,791 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:51:42,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:51:42,792 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:51:42,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2022-11-03 03:51:43,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:51:43,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:51:43,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 03:51:43,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:43,101 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:51:43,109 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:51:45,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:51:45,626 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-11-03 03:51:45,627 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-11-03 03:51:45,647 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:51:45,647 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:51:45,740 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:51:45,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:51:46,363 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:51:46,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1242763620] [2022-11-03 03:51:46,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1242763620] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:46,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1273488252] [2022-11-03 03:51:46,364 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:51:46,364 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:51:46,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:51:46,365 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:51:46,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2022-11-03 03:51:46,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:51:46,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:51:46,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 03:51:46,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:46,898 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:51:46,907 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:51:49,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:51:49,354 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-11-03 03:51:49,354 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-11-03 03:51:49,374 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:51:49,374 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:51:49,438 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:51:49,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:51:50,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1273488252] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:50,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747453681] [2022-11-03 03:51:50,047 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:51:50,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:50,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:51:50,049 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:51:50,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-03 03:51:50,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:51:50,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:51:50,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 03:51:50,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:50,334 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:51:50,342 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:52:03,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:52:03,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:52:03,074 INFO L356 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-03 03:52:03,074 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2022-11-03 03:52:03,098 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:52:03,098 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2022-11-03 03:52:03,178 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 36 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 03:52:03,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:05,547 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse0 (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset))) (and (forall ((v_nondet_tree_~n~0.base_225 (_ BitVec 32)) (v_nondet_tree_~n~0.base_226 (_ BitVec 32))) (or (forall ((v_ArrVal_2848 (_ BitVec 32))) (bvule .cse0 (select (store (store |c_#length| v_nondet_tree_~n~0.base_225 (_ bv12 32)) v_nondet_tree_~n~0.base_226 v_ArrVal_2848) c_nondet_tree_~n~0.base))) (not (= (_ bv0 1) (select (store |c_#valid| v_nondet_tree_~n~0.base_225 (_ bv1 1)) v_nondet_tree_~n~0.base_226))))) (or (forall ((v_nondet_tree_~n~0.base_225 (_ BitVec 32)) (v_nondet_tree_~n~0.base_226 (_ BitVec 32))) (not (= (_ bv0 1) (select (store |c_#valid| v_nondet_tree_~n~0.base_225 (_ bv1 1)) v_nondet_tree_~n~0.base_226)))) (bvule (bvadd (_ bv4 32) c_nondet_tree_~n~0.offset) .cse0)))) is different from false [2022-11-03 03:52:05,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747453681] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:52:05,553 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:52:05,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2022-11-03 03:52:05,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384391087] [2022-11-03 03:52:05,553 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:52:05,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 03:52:05,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:52:05,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 03:52:05,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=122, Unknown=6, NotChecked=22, Total=182 [2022-11-03 03:52:05,554 INFO L87 Difference]: Start difference. First operand 203 states and 299 transitions. Second operand has 11 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 7 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-03 03:52:26,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:52:26,008 INFO L93 Difference]: Finished difference Result 227 states and 335 transitions. [2022-11-03 03:52:26,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 03:52:26,010 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 7 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) Word has length 39 [2022-11-03 03:52:26,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:52:26,012 INFO L225 Difference]: With dead ends: 227 [2022-11-03 03:52:26,012 INFO L226 Difference]: Without dead ends: 227 [2022-11-03 03:52:26,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 102 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 39.5s TimeCoverageRelationStatistics Valid=61, Invalid=202, Unknown=13, NotChecked=30, Total=306 [2022-11-03 03:52:26,013 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 84 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 310 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:52:26,014 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 164 Invalid, 475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 144 Invalid, 0 Unknown, 310 Unchecked, 0.5s Time] [2022-11-03 03:52:26,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-11-03 03:52:26,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2022-11-03 03:52:26,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 154 states have (on average 1.2207792207792207) internal successors, (188), 172 states have internal predecessors, (188), 32 states have call successors, (32), 12 states have call predecessors, (32), 25 states have return successors, (115), 42 states have call predecessors, (115), 32 states have call successors, (115) [2022-11-03 03:52:26,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 335 transitions. [2022-11-03 03:52:26,029 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 335 transitions. Word has length 39 [2022-11-03 03:52:26,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:52:26,029 INFO L495 AbstractCegarLoop]: Abstraction has 227 states and 335 transitions. [2022-11-03 03:52:26,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 7 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-03 03:52:26,030 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 335 transitions. [2022-11-03 03:52:26,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-03 03:52:26,031 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:52:26,031 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:52:26,051 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2022-11-03 03:52:26,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:26,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:26,646 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:26,647 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:52:26,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:52:26,647 INFO L85 PathProgramCache]: Analyzing trace with hash -612022781, now seen corresponding path program 1 times [2022-11-03 03:52:26,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:52:26,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [445887867] [2022-11-03 03:52:26,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:52:26,648 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:52:26,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:52:26,649 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:52:26,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2022-11-03 03:52:26,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:52:26,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-03 03:52:26,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:26,994 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:52:27,007 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:52:27,631 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-11-03 03:52:27,636 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-11-03 03:52:27,840 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:52:27,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:28,375 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:52:28,376 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:52:28,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [445887867] [2022-11-03 03:52:28,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [445887867] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:52:28,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1283564863] [2022-11-03 03:52:28,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:52:28,377 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:52:28,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:52:28,384 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:52:28,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2022-11-03 03:52:28,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:52:28,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-03 03:52:28,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:29,021 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:52:29,033 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:52:30,139 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:52:30,147 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:52:30,167 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:52:30,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:30,684 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:52:30,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1283564863] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:52:30,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211718057] [2022-11-03 03:52:30,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:52:30,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:30,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:52:30,686 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:52:30,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-03 03:52:30,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:52:30,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-03 03:52:30,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:30,979 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:52:30,989 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:52:31,522 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:52:31,526 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:52:31,550 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:52:31,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:32,113 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:52:32,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211718057] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:52:32,113 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:52:32,113 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 15, 13, 15, 13] total 23 [2022-11-03 03:52:32,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017411390] [2022-11-03 03:52:32,114 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:52:32,114 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-03 03:52:32,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:52:32,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-03 03:52:32,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2022-11-03 03:52:32,115 INFO L87 Difference]: Start difference. First operand 227 states and 335 transitions. Second operand has 23 states, 20 states have (on average 2.5) internal successors, (50), 16 states have internal predecessors, (50), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 4 states have call successors, (9) [2022-11-03 03:52:33,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:52:33,444 INFO L93 Difference]: Finished difference Result 271 states and 404 transitions. [2022-11-03 03:52:33,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-03 03:52:33,447 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 2.5) internal successors, (50), 16 states have internal predecessors, (50), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 4 states have call successors, (9) Word has length 38 [2022-11-03 03:52:33,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:52:33,450 INFO L225 Difference]: With dead ends: 271 [2022-11-03 03:52:33,450 INFO L226 Difference]: Without dead ends: 271 [2022-11-03 03:52:33,451 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 198 SyntacticMatches, 5 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=120, Invalid=750, Unknown=0, NotChecked=0, Total=870 [2022-11-03 03:52:33,452 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 80 mSDsluCounter, 626 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 699 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 03:52:33,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 699 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 287 Invalid, 0 Unknown, 52 Unchecked, 0.9s Time] [2022-11-03 03:52:33,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2022-11-03 03:52:33,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 250. [2022-11-03 03:52:33,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 171 states have (on average 1.2280701754385965) internal successors, (210), 189 states have internal predecessors, (210), 35 states have call successors, (35), 15 states have call predecessors, (35), 28 states have return successors, (140), 45 states have call predecessors, (140), 35 states have call successors, (140) [2022-11-03 03:52:33,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 385 transitions. [2022-11-03 03:52:33,472 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 385 transitions. Word has length 38 [2022-11-03 03:52:33,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:52:33,472 INFO L495 AbstractCegarLoop]: Abstraction has 250 states and 385 transitions. [2022-11-03 03:52:33,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 2.5) internal successors, (50), 16 states have internal predecessors, (50), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 4 states have call successors, (9) [2022-11-03 03:52:33,473 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 385 transitions. [2022-11-03 03:52:33,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-03 03:52:33,474 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:52:33,475 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:52:33,513 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2022-11-03 03:52:33,699 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (47)] Ended with exit code 0 [2022-11-03 03:52:33,900 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (46)] Ended with exit code 0 [2022-11-03 03:52:34,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:52:34,091 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:52:34,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:52:34,091 INFO L85 PathProgramCache]: Analyzing trace with hash -101280226, now seen corresponding path program 2 times [2022-11-03 03:52:34,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:52:34,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1645944327] [2022-11-03 03:52:34,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:52:34,092 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:52:34,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:52:34,093 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:52:34,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2022-11-03 03:52:34,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:52:34,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:34,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 03:52:34,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:34,732 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:52:34,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:35,582 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2022-11-03 03:52:35,825 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:52:35,825 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:52:35,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1645944327] [2022-11-03 03:52:35,826 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1645944327] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:52:35,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [485717445] [2022-11-03 03:52:35,826 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:52:35,826 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:52:35,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:52:35,827 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:52:35,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2022-11-03 03:52:36,300 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:52:36,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:36,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 03:52:36,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:36,405 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:52:36,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:36,636 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2022-11-03 03:52:36,753 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:52:36,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [485717445] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:52:36,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315353615] [2022-11-03 03:52:36,753 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:52:36,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:36,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:52:36,754 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:52:36,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-03 03:52:37,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:52:37,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:37,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 03:52:37,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:37,117 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:52:37,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:37,353 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2022-11-03 03:52:37,466 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:52:37,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315353615] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:52:37,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:52:37,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2022-11-03 03:52:37,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245285082] [2022-11-03 03:52:37,467 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:52:37,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 03:52:37,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:52:37,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 03:52:37,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2022-11-03 03:52:37,468 INFO L87 Difference]: Start difference. First operand 250 states and 385 transitions. Second operand has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-03 03:52:39,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:52:39,835 INFO L93 Difference]: Finished difference Result 252 states and 384 transitions. [2022-11-03 03:52:39,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 03:52:39,843 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) Word has length 39 [2022-11-03 03:52:39,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:52:39,845 INFO L225 Difference]: With dead ends: 252 [2022-11-03 03:52:39,845 INFO L226 Difference]: Without dead ends: 252 [2022-11-03 03:52:39,845 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 213 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2022-11-03 03:52:39,846 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 67 mSDsluCounter, 482 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 552 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:52:39,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 552 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-03 03:52:39,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2022-11-03 03:52:39,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 252. [2022-11-03 03:52:39,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 172 states have (on average 1.191860465116279) internal successors, (205), 191 states have internal predecessors, (205), 35 states have call successors, (35), 15 states have call predecessors, (35), 29 states have return successors, (144), 45 states have call predecessors, (144), 35 states have call successors, (144) [2022-11-03 03:52:39,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 384 transitions. [2022-11-03 03:52:39,866 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 384 transitions. Word has length 39 [2022-11-03 03:52:39,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:52:39,866 INFO L495 AbstractCegarLoop]: Abstraction has 252 states and 384 transitions. [2022-11-03 03:52:39,866 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-03 03:52:39,867 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 384 transitions. [2022-11-03 03:52:39,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-03 03:52:39,868 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:52:39,868 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-03 03:52:39,882 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:40,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:40,286 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (50)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:40,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:52:40,482 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:52:40,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:52:40,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1830162110, now seen corresponding path program 3 times [2022-11-03 03:52:40,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:52:40,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1923902557] [2022-11-03 03:52:40,483 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:52:40,483 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:52:40,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:52:40,484 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:52:40,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2022-11-03 03:52:40,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 03:52:40,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:40,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-03 03:52:40,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:40,897 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:52:41,476 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 03:52:41,530 INFO L356 Elim1Store]: treesize reduction 34, result has 35.8 percent of original size [2022-11-03 03:52:41,530 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 31 [2022-11-03 03:52:41,551 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 03:52:41,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:42,198 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:52:42,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1923902557] [2022-11-03 03:52:42,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1923902557] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:52:42,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1873680699] [2022-11-03 03:52:42,199 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:52:42,199 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:52:42,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:52:42,200 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:52:42,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2022-11-03 03:52:42,771 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:52:42,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [909875445] [2022-11-03 03:52:42,771 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:52:42,771 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:42,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:52:42,773 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:52:42,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-03 03:52:42,778 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (53)] Ended with exit code 1 [2022-11-03 03:52:43,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 03:52:43,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:43,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 03:52:43,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:43,325 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:52:43,573 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 03:52:43,624 INFO L356 Elim1Store]: treesize reduction 34, result has 35.8 percent of original size [2022-11-03 03:52:43,624 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 31 [2022-11-03 03:52:43,644 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 26 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-03 03:52:43,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:44,249 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [909875445] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:52:44,250 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 03:52:44,250 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 9 [2022-11-03 03:52:44,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769535964] [2022-11-03 03:52:44,250 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 03:52:44,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 03:52:44,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:52:44,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 03:52:44,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-03 03:52:44,251 INFO L87 Difference]: Start difference. First operand 252 states and 384 transitions. Second operand has 10 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 6 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-03 03:52:44,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:52:44,679 INFO L93 Difference]: Finished difference Result 284 states and 437 transitions. [2022-11-03 03:52:44,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 03:52:44,679 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 6 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 39 [2022-11-03 03:52:44,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:52:44,682 INFO L225 Difference]: With dead ends: 284 [2022-11-03 03:52:44,682 INFO L226 Difference]: Without dead ends: 284 [2022-11-03 03:52:44,682 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 71 SyntacticMatches, 11 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2022-11-03 03:52:44,683 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 15 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 218 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:52:44,683 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 163 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 218 Unchecked, 0.2s Time] [2022-11-03 03:52:44,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2022-11-03 03:52:44,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 283. [2022-11-03 03:52:44,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 194 states have (on average 1.1855670103092784) internal successors, (230), 214 states have internal predecessors, (230), 39 states have call successors, (39), 17 states have call predecessors, (39), 34 states have return successors, (168), 51 states have call predecessors, (168), 39 states have call successors, (168) [2022-11-03 03:52:44,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 437 transitions. [2022-11-03 03:52:44,702 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 437 transitions. Word has length 39 [2022-11-03 03:52:44,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:52:44,702 INFO L495 AbstractCegarLoop]: Abstraction has 283 states and 437 transitions. [2022-11-03 03:52:44,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 6 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-03 03:52:44,703 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 437 transitions. [2022-11-03 03:52:44,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-03 03:52:44,704 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:52:44,704 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-03 03:52:44,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:44,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-03 03:52:45,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:52:45,119 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:52:45,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:52:45,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1830162109, now seen corresponding path program 3 times [2022-11-03 03:52:45,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:52:45,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [834476204] [2022-11-03 03:52:45,119 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:52:45,119 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:52:45,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:52:45,120 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:52:45,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2022-11-03 03:52:45,548 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 03:52:45,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:45,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 03:52:45,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:45,570 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:52:45,986 INFO L356 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2022-11-03 03:52:45,987 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 19 [2022-11-03 03:52:46,011 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 24 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:52:46,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:52:46,542 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:52:46,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [834476204] [2022-11-03 03:52:46,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [834476204] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:52:46,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1544040350] [2022-11-03 03:52:46,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:52:46,543 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:52:46,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:52:46,544 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:52:46,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (56)] Waiting until timeout for monitored process [2022-11-03 03:52:47,187 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 03:52:47,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:52:47,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-03 03:52:47,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:52:47,217 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:52:47,226 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:53:01,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:53:01,393 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-11-03 03:53:01,393 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-11-03 03:53:01,413 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:53:01,414 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:53:01,434 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:53:01,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:53:04,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1544040350] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:53:04,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846418411] [2022-11-03 03:53:04,186 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:53:04,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:53:04,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:53:04,188 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:53:04,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-03 03:53:05,315 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 03:53:05,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:53:05,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 03:53:05,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:53:05,339 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:53:09,923 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:53:09,923 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:53:10,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:53:10,131 INFO L356 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-03 03:53:10,132 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2022-11-03 03:53:10,166 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:53:10,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:53:10,344 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 35 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 03:53:10,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:53:10,920 INFO L356 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-11-03 03:53:10,920 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2022-11-03 03:53:21,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1846418411] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:53:21,648 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:53:21,648 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 10] total 17 [2022-11-03 03:53:21,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417776806] [2022-11-03 03:53:21,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:53:21,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 03:53:21,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:53:21,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 03:53:21,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=375, Unknown=10, NotChecked=0, Total=462 [2022-11-03 03:53:21,650 INFO L87 Difference]: Start difference. First operand 283 states and 437 transitions. Second operand has 18 states, 17 states have (on average 3.235294117647059) internal successors, (55), 15 states have internal predecessors, (55), 9 states have call successors, (13), 3 states have call predecessors, (13), 7 states have return successors, (13), 10 states have call predecessors, (13), 8 states have call successors, (13) [2022-11-03 03:53:30,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:53:30,709 INFO L93 Difference]: Finished difference Result 286 states and 445 transitions. [2022-11-03 03:53:30,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 03:53:30,710 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.235294117647059) internal successors, (55), 15 states have internal predecessors, (55), 9 states have call successors, (13), 3 states have call predecessors, (13), 7 states have return successors, (13), 10 states have call predecessors, (13), 8 states have call successors, (13) Word has length 39 [2022-11-03 03:53:30,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:53:30,717 INFO L225 Difference]: With dead ends: 286 [2022-11-03 03:53:30,717 INFO L226 Difference]: Without dead ends: 286 [2022-11-03 03:53:30,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 97 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 40.4s TimeCoverageRelationStatistics Valid=130, Invalid=559, Unknown=13, NotChecked=0, Total=702 [2022-11-03 03:53:30,719 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 100 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 387 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:53:30,720 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 146 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 105 Invalid, 0 Unknown, 387 Unchecked, 0.4s Time] [2022-11-03 03:53:30,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2022-11-03 03:53:30,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 286. [2022-11-03 03:53:30,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 196 states have (on average 1.1785714285714286) internal successors, (231), 216 states have internal predecessors, (231), 40 states have call successors, (40), 17 states have call predecessors, (40), 34 states have return successors, (174), 52 states have call predecessors, (174), 40 states have call successors, (174) [2022-11-03 03:53:30,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 445 transitions. [2022-11-03 03:53:30,739 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 445 transitions. Word has length 39 [2022-11-03 03:53:30,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:53:30,739 INFO L495 AbstractCegarLoop]: Abstraction has 286 states and 445 transitions. [2022-11-03 03:53:30,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.235294117647059) internal successors, (55), 15 states have internal predecessors, (55), 9 states have call successors, (13), 3 states have call predecessors, (13), 7 states have return successors, (13), 10 states have call predecessors, (13), 8 states have call successors, (13) [2022-11-03 03:53:30,740 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 445 transitions. [2022-11-03 03:53:30,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 03:53:30,741 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:53:30,742 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2022-11-03 03:53:30,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-11-03 03:53:30,962 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (56)] Ended with exit code 0 [2022-11-03 03:53:31,169 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (55)] Ended with exit code 0 [2022-11-03 03:53:31,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:53:31,356 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:53:31,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:53:31,357 INFO L85 PathProgramCache]: Analyzing trace with hash -172709004, now seen corresponding path program 3 times [2022-11-03 03:53:31,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:53:31,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1072382514] [2022-11-03 03:53:31,357 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:53:31,357 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:53:31,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:53:31,358 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:53:31,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2022-11-03 03:53:32,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-03 03:53:32,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:53:32,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 03:53:32,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:53:32,070 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:53:32,080 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:53:36,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:53:36,485 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:53:36,506 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:53:36,507 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:53:42,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:53:42,855 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:53:42,876 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:53:42,876 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:53:42,886 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 36 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-03 03:53:42,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:53:45,367 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:53:45,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1072382514] [2022-11-03 03:53:45,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1072382514] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:53:45,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1415442224] [2022-11-03 03:53:45,368 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:53:45,370 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:53:45,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:53:45,375 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:53:45,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2022-11-03 03:53:45,972 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:53:45,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339229109] [2022-11-03 03:53:45,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:53:45,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:53:45,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:53:45,974 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:53:45,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-11-03 03:53:45,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (59)] Forceful destruction successful, exit code 1 [2022-11-03 03:53:50,245 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-03 03:53:50,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:53:50,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 03:53:50,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:53:50,264 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:53:50,274 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:53:56,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:53:56,600 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:53:56,619 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:53:56,619 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:54:00,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:00,948 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2022-11-03 03:54:00,974 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:54:00,974 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:54:00,981 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 36 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-03 03:54:00,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:06,168 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [339229109] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:54:06,168 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 03:54:06,168 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2022-11-03 03:54:06,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498563953] [2022-11-03 03:54:06,169 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 03:54:06,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 03:54:06,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:54:06,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 03:54:06,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2022-11-03 03:54:06,170 INFO L87 Difference]: Start difference. First operand 286 states and 445 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-03 03:54:06,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:54:06,723 INFO L93 Difference]: Finished difference Result 324 states and 532 transitions. [2022-11-03 03:54:06,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 03:54:06,724 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 45 [2022-11-03 03:54:06,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:54:06,727 INFO L225 Difference]: With dead ends: 324 [2022-11-03 03:54:06,727 INFO L226 Difference]: Without dead ends: 324 [2022-11-03 03:54:06,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 74 SyntacticMatches, 12 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 27.8s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2022-11-03 03:54:06,728 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 54 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:54:06,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 110 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 128 Invalid, 0 Unknown, 92 Unchecked, 0.5s Time] [2022-11-03 03:54:06,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2022-11-03 03:54:06,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 320. [2022-11-03 03:54:06,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 220 states have (on average 1.1681818181818182) internal successors, (257), 242 states have internal predecessors, (257), 44 states have call successors, (44), 19 states have call predecessors, (44), 40 states have return successors, (198), 58 states have call predecessors, (198), 44 states have call successors, (198) [2022-11-03 03:54:06,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 499 transitions. [2022-11-03 03:54:06,750 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 499 transitions. Word has length 45 [2022-11-03 03:54:06,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:54:06,751 INFO L495 AbstractCegarLoop]: Abstraction has 320 states and 499 transitions. [2022-11-03 03:54:06,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-03 03:54:06,751 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 499 transitions. [2022-11-03 03:54:06,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 03:54:06,753 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:54:06,753 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2022-11-03 03:54:06,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2022-11-03 03:54:07,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2022-11-03 03:54:07,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:54:07,177 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:54:07,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:54:07,177 INFO L85 PathProgramCache]: Analyzing trace with hash 780603380, now seen corresponding path program 4 times [2022-11-03 03:54:07,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:54:07,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1575663051] [2022-11-03 03:54:07,178 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:54:07,178 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:54:07,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:54:07,179 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:54:07,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2022-11-03 03:54:07,619 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:54:07,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:54:07,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 03:54:07,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:07,641 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:54:07,653 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:54:10,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:10,254 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-11-03 03:54:10,254 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-11-03 03:54:10,287 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:54:10,288 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:54:10,424 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:54:10,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:11,371 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:54:11,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1575663051] [2022-11-03 03:54:11,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1575663051] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:54:11,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1293428678] [2022-11-03 03:54:11,372 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:54:11,372 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:54:11,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:54:11,373 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:54:11,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2022-11-03 03:54:12,018 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:54:12,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:54:12,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-03 03:54:12,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:12,047 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:54:12,056 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:54:14,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:14,503 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-11-03 03:54:14,506 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-11-03 03:54:14,546 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:54:14,546 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:54:14,611 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:54:14,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:18,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1293428678] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:54:18,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475998032] [2022-11-03 03:54:18,376 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:54:18,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:54:18,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:54:18,378 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:54:18,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-11-03 03:54:18,729 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:54:18,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:54:18,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-03 03:54:18,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:18,740 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:54:18,750 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:54:21,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:21,214 INFO L356 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2022-11-03 03:54:21,214 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2022-11-03 03:54:21,248 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:54:21,248 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:54:21,308 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:54:21,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:25,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475998032] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:54:25,006 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:54:25,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 8 [2022-11-03 03:54:25,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995133936] [2022-11-03 03:54:25,007 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:54:25,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-03 03:54:25,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:54:25,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-03 03:54:25,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=165, Unknown=3, NotChecked=0, Total=210 [2022-11-03 03:54:25,009 INFO L87 Difference]: Start difference. First operand 320 states and 499 transitions. Second operand has 9 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-03 03:54:29,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:54:29,770 INFO L93 Difference]: Finished difference Result 355 states and 568 transitions. [2022-11-03 03:54:29,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 03:54:29,771 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) Word has length 45 [2022-11-03 03:54:29,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:54:29,774 INFO L225 Difference]: With dead ends: 355 [2022-11-03 03:54:29,775 INFO L226 Difference]: Without dead ends: 355 [2022-11-03 03:54:29,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 139 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=64, Invalid=203, Unknown=5, NotChecked=0, Total=272 [2022-11-03 03:54:29,776 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 44 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 256 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 03:54:29,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 175 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 162 Invalid, 0 Unknown, 256 Unchecked, 0.6s Time] [2022-11-03 03:54:29,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2022-11-03 03:54:29,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 351. [2022-11-03 03:54:29,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 241 states have (on average 1.16597510373444) internal successors, (281), 267 states have internal predecessors, (281), 49 states have call successors, (49), 22 states have call predecessors, (49), 45 states have return successors, (228), 61 states have call predecessors, (228), 49 states have call successors, (228) [2022-11-03 03:54:29,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 558 transitions. [2022-11-03 03:54:29,798 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 558 transitions. Word has length 45 [2022-11-03 03:54:29,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:54:29,798 INFO L495 AbstractCegarLoop]: Abstraction has 351 states and 558 transitions. [2022-11-03 03:54:29,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-03 03:54:29,798 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 558 transitions. [2022-11-03 03:54:29,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 03:54:29,800 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:54:29,800 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:54:29,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2022-11-03 03:54:30,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (62)] Forceful destruction successful, exit code 0 [2022-11-03 03:54:30,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (61)] Forceful destruction successful, exit code 0 [2022-11-03 03:54:30,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 [2022-11-03 03:54:30,415 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:54:30,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:54:30,415 INFO L85 PathProgramCache]: Analyzing trace with hash -407980419, now seen corresponding path program 2 times [2022-11-03 03:54:30,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:54:30,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [527344106] [2022-11-03 03:54:30,416 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:54:30,416 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:54:30,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:54:30,417 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:54:30,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2022-11-03 03:54:30,891 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:54:30,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:54:30,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 59 conjunts are in the unsatisfiable core [2022-11-03 03:54:30,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:30,916 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:54:31,098 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:54:31,119 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:54:31,603 WARN L855 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_4219 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| nondet_tree_~n~0.base v_ArrVal_4219))) (exists ((v_ArrVal_4218 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| nondet_tree_~n~0.base v_ArrVal_4218))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) is different from true [2022-11-03 03:54:31,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:31,667 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-03 03:54:31,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:31,687 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-03 03:54:31,718 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:54:31,718 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:54:31,805 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:54:31,819 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:54:32,366 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:54:32,376 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:54:32,634 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 9 not checked. [2022-11-03 03:54:32,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:36,214 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:54:36,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [527344106] [2022-11-03 03:54:36,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [527344106] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:54:36,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1179725888] [2022-11-03 03:54:36,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:54:36,215 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:54:36,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:54:36,216 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:54:36,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2022-11-03 03:54:36,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:54:36,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:54:36,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-03 03:54:36,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:36,972 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:54:37,071 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:54:37,083 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:54:37,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:37,664 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-03 03:54:37,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:37,683 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-03 03:54:37,709 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:54:37,710 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:54:37,737 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:54:37,749 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:54:37,918 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:54:37,922 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:54:37,953 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 32 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:54:37,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:40,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1179725888] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:54:40,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464489603] [2022-11-03 03:54:40,571 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-03 03:54:40,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:54:40,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:54:40,572 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:54:40,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-11-03 03:54:40,992 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-03 03:54:40,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:54:40,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-03 03:54:41,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:41,413 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:54:41,434 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:54:42,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:42,004 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-03 03:54:42,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:54:42,020 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-03 03:54:42,050 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:54:42,050 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:54:42,065 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:54:42,084 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:54:42,300 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:54:42,305 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:54:42,333 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 7 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:54:42,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:54:44,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464489603] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:54:44,911 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:54:44,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 20] total 25 [2022-11-03 03:54:44,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2864814] [2022-11-03 03:54:44,912 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:54:44,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-03 03:54:44,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:54:44,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-03 03:54:44,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=835, Unknown=15, NotChecked=58, Total=992 [2022-11-03 03:54:44,914 INFO L87 Difference]: Start difference. First operand 351 states and 558 transitions. Second operand has 25 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 18 states have internal predecessors, (40), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-03 03:54:45,689 WARN L855 $PredicateComparison]: unable to prove that (and (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_4219 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| nondet_tree_~n~0.base v_ArrVal_4219))) (exists ((v_ArrVal_4218 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| nondet_tree_~n~0.base v_ArrVal_4218))) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base)))) (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_4330 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| nondet_tree_~n~0.base v_ArrVal_4330))) (exists ((v_ArrVal_4331 (Array (_ BitVec 32) (_ BitVec 32)))) (= (store |c_old(#memory_$Pointer$.base)| nondet_tree_~n~0.base v_ArrVal_4331) |c_#memory_$Pointer$.base|)) (= (_ bv0 1) (select |c_old(#valid)| nondet_tree_~n~0.base))))) is different from true [2022-11-03 03:54:50,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:54:50,049 INFO L93 Difference]: Finished difference Result 421 states and 668 transitions. [2022-11-03 03:54:50,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-03 03:54:50,051 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 18 states have internal predecessors, (40), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 45 [2022-11-03 03:54:50,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:54:50,054 INFO L225 Difference]: With dead ends: 421 [2022-11-03 03:54:50,054 INFO L226 Difference]: Without dead ends: 421 [2022-11-03 03:54:50,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 147 SyntacticMatches, 9 SemanticMatches, 46 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=202, Invalid=1853, Unknown=23, NotChecked=178, Total=2256 [2022-11-03 03:54:50,056 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 132 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 1351 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 1701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 1351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 303 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:54:50,056 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 440 Invalid, 1701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 1351 Invalid, 0 Unknown, 303 Unchecked, 3.5s Time] [2022-11-03 03:54:50,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2022-11-03 03:54:50,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 410. [2022-11-03 03:54:50,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 410 states, 284 states have (on average 1.1654929577464788) internal successors, (331), 310 states have internal predecessors, (331), 57 states have call successors, (57), 26 states have call predecessors, (57), 53 states have return successors, (271), 73 states have call predecessors, (271), 57 states have call successors, (271) [2022-11-03 03:54:50,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 659 transitions. [2022-11-03 03:54:50,088 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 659 transitions. Word has length 45 [2022-11-03 03:54:50,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:54:50,088 INFO L495 AbstractCegarLoop]: Abstraction has 410 states and 659 transitions. [2022-11-03 03:54:50,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 18 states have internal predecessors, (40), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-03 03:54:50,089 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 659 transitions. [2022-11-03 03:54:50,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 03:54:50,091 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:54:50,091 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2022-11-03 03:54:50,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2022-11-03 03:54:50,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (65)] Forceful destruction successful, exit code 0 [2022-11-03 03:54:50,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2022-11-03 03:54:50,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:54:50,708 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting nondet_treeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:54:50,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:54:50,708 INFO L85 PathProgramCache]: Analyzing trace with hash 1219497204, now seen corresponding path program 5 times [2022-11-03 03:54:50,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:54:50,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [538978885] [2022-11-03 03:54:50,709 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-03 03:54:50,709 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:54:50,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:54:50,710 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:54:50,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2022-11-03 03:54:51,269 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2022-11-03 03:54:51,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:54:51,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-03 03:54:51,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:54:51,297 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:54:51,307 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:55:02,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:55:02,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:55:02,228 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 03:55:02,228 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 23 [2022-11-03 03:55:02,319 INFO L356 Elim1Store]: treesize reduction 17, result has 45.2 percent of original size [2022-11-03 03:55:02,320 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 38 [2022-11-03 03:55:02,415 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 55 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:55:02,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:55:03,493 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:55:03,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [538978885] [2022-11-03 03:55:03,495 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [538978885] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:55:03,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1901618104] [2022-11-03 03:55:03,496 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-03 03:55:03,496 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:55:03,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:55:03,497 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:55:03,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2022-11-03 03:55:04,228 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:55:04,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534886926] [2022-11-03 03:55:04,228 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-03 03:55:04,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:55:04,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:55:04,230 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:55:04,243 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (68)] Ended with exit code 1 [2022-11-03 03:55:04,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-11-03 03:55:08,125 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2022-11-03 03:55:08,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:55:08,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-03 03:55:08,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:55:08,141 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:55:31,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:55:31,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:55:31,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:55:31,103 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 19 [2022-11-03 03:55:31,149 INFO L356 Elim1Store]: treesize reduction 22, result has 29.0 percent of original size [2022-11-03 03:55:31,149 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 24 [2022-11-03 03:55:31,161 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 46 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-03 03:55:31,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:55:33,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534886926] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:55:33,905 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 03:55:33,905 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2022-11-03 03:55:33,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540353988] [2022-11-03 03:55:33,906 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 03:55:33,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 03:55:33,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:55:33,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 03:55:33,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=157, Unknown=13, NotChecked=0, Total=210 [2022-11-03 03:55:33,907 INFO L87 Difference]: Start difference. First operand 410 states and 659 transitions. Second operand has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 12 states have internal predecessors, (40), 8 states have call successors, (10), 3 states have call predecessors, (10), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-03 03:55:52,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:55:52,986 INFO L93 Difference]: Finished difference Result 477 states and 783 transitions. [2022-11-03 03:55:52,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 03:55:52,988 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 12 states have internal predecessors, (40), 8 states have call successors, (10), 3 states have call predecessors, (10), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) Word has length 45 [2022-11-03 03:55:52,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:55:52,992 INFO L225 Difference]: With dead ends: 477 [2022-11-03 03:55:52,992 INFO L226 Difference]: Without dead ends: 477 [2022-11-03 03:55:52,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 75 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 54.3s TimeCoverageRelationStatistics Valid=86, Invalid=235, Unknown=21, NotChecked=0, Total=342 [2022-11-03 03:55:52,994 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 43 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 407 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 03:55:52,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 174 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 161 Invalid, 0 Unknown, 407 Unchecked, 0.6s Time] [2022-11-03 03:55:52,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2022-11-03 03:55:53,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 475. [2022-11-03 03:55:53,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 329 states have (on average 1.1519756838905775) internal successors, (379), 360 states have internal predecessors, (379), 67 states have call successors, (67), 30 states have call predecessors, (67), 63 states have return successors, (335), 84 states have call predecessors, (335), 67 states have call successors, (335) [2022-11-03 03:55:53,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 781 transitions. [2022-11-03 03:55:53,031 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 781 transitions. Word has length 45 [2022-11-03 03:55:53,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:55:53,032 INFO L495 AbstractCegarLoop]: Abstraction has 475 states and 781 transitions. [2022-11-03 03:55:53,032 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 12 states have internal predecessors, (40), 8 states have call successors, (10), 3 states have call predecessors, (10), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-03 03:55:53,032 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 781 transitions. [2022-11-03 03:55:53,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 03:55:53,035 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:55:53,035 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:55:53,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2022-11-03 03:55:53,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2022-11-03 03:55:53,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:55:53,449 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:55:53,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:55:53,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1293875203, now seen corresponding path program 3 times [2022-11-03 03:55:53,450 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:55:53,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [125276309] [2022-11-03 03:55:53,450 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:55:53,450 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:55:53,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:55:53,453 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:55:53,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2022-11-03 03:55:54,018 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 03:55:54,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:55:54,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-03 03:55:54,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:55:54,199 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:55:54,314 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2022-11-03 03:55:54,639 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2022-11-03 03:55:54,820 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 22 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 03:55:54,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:55:55,889 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 03:55:55,889 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:55:55,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [125276309] [2022-11-03 03:55:55,889 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [125276309] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:55:55,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [820137197] [2022-11-03 03:55:55,890 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:55:55,890 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:55:55,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:55:55,891 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:55:55,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (71)] Waiting until timeout for monitored process [2022-11-03 03:55:56,584 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 03:55:56,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:55:56,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-03 03:55:56,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:55:56,835 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:55:57,005 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2022-11-03 03:55:57,609 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2022-11-03 03:55:57,628 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:55:57,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:55:58,738 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 03:55:58,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [820137197] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:55:58,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601098271] [2022-11-03 03:55:58,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:55:58,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:55:58,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:55:58,740 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:55:58,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2022-11-03 03:55:59,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 03:55:59,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:55:59,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-03 03:55:59,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:55:59,264 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:55:59,341 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2022-11-03 03:55:59,556 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2022-11-03 03:55:59,574 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 20 proven. 13 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 03:55:59,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:56:00,313 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 03:56:00,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601098271] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:56:00,314 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:56:00,314 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 16, 15, 15, 14] total 25 [2022-11-03 03:56:00,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127003871] [2022-11-03 03:56:00,315 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:56:00,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 03:56:00,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:56:00,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 03:56:00,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=588, Unknown=0, NotChecked=0, Total=650 [2022-11-03 03:56:00,317 INFO L87 Difference]: Start difference. First operand 475 states and 781 transitions. Second operand has 26 states, 22 states have (on average 2.409090909090909) internal successors, (53), 19 states have internal predecessors, (53), 8 states have call successors, (14), 8 states have call predecessors, (14), 8 states have return successors, (13), 8 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-03 03:56:04,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:56:04,830 INFO L93 Difference]: Finished difference Result 501 states and 812 transitions. [2022-11-03 03:56:04,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-03 03:56:04,839 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 2.409090909090909) internal successors, (53), 19 states have internal predecessors, (53), 8 states have call successors, (14), 8 states have call predecessors, (14), 8 states have return successors, (13), 8 states have call predecessors, (13), 5 states have call successors, (13) Word has length 45 [2022-11-03 03:56:04,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:56:04,843 INFO L225 Difference]: With dead ends: 501 [2022-11-03 03:56:04,843 INFO L226 Difference]: Without dead ends: 501 [2022-11-03 03:56:04,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 238 SyntacticMatches, 6 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=135, Invalid=1125, Unknown=0, NotChecked=0, Total=1260 [2022-11-03 03:56:04,851 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 87 mSDsluCounter, 1076 mSDsCounter, 0 mSdLazyCounter, 1287 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 1184 SdHoareTripleChecker+Invalid, 1537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 224 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-03 03:56:04,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 1184 Invalid, 1537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 1287 Invalid, 0 Unknown, 224 Unchecked, 3.8s Time] [2022-11-03 03:56:04,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2022-11-03 03:56:04,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 488. [2022-11-03 03:56:04,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 340 states have (on average 1.1676470588235295) internal successors, (397), 370 states have internal predecessors, (397), 69 states have call successors, (69), 30 states have call predecessors, (69), 63 states have return successors, (331), 87 states have call predecessors, (331), 69 states have call successors, (331) [2022-11-03 03:56:04,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 797 transitions. [2022-11-03 03:56:04,882 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 797 transitions. Word has length 45 [2022-11-03 03:56:04,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:56:04,882 INFO L495 AbstractCegarLoop]: Abstraction has 488 states and 797 transitions. [2022-11-03 03:56:04,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 2.409090909090909) internal successors, (53), 19 states have internal predecessors, (53), 8 states have call successors, (14), 8 states have call predecessors, (14), 8 states have return successors, (13), 8 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-03 03:56:04,883 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 797 transitions. [2022-11-03 03:56:04,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 03:56:04,885 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:56:04,885 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:56:04,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (70)] Forceful destruction successful, exit code 0 [2022-11-03 03:56:05,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2022-11-03 03:56:05,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (71)] Forceful destruction successful, exit code 0 [2022-11-03 03:56:05,503 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:56:05,503 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:56:05,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:56:05,503 INFO L85 PathProgramCache]: Analyzing trace with hash -1293875202, now seen corresponding path program 1 times [2022-11-03 03:56:05,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:56:05,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [571894666] [2022-11-03 03:56:05,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:56:05,504 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:56:05,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:56:05,505 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:56:05,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2022-11-03 03:56:05,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:56:05,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-03 03:56:05,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:56:05,963 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:56:06,194 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:56:06,209 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:56:06,404 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 03:56:06,419 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:56:06,898 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2022-11-03 03:56:06,908 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-11-03 03:56:07,181 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:56:07,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:56:16,016 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:56:16,016 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:56:16,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [571894666] [2022-11-03 03:56:16,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [571894666] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:56:16,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1761799133] [2022-11-03 03:56:16,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:56:16,017 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:56:16,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:56:16,018 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:56:16,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (74)] Waiting until timeout for monitored process [2022-11-03 03:56:16,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:56:16,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 03:56:16,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:56:17,031 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:56:17,356 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:56:17,368 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:56:17,654 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 03:56:17,666 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:56:18,816 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-03 03:56:18,820 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:56:18,855 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:56:18,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:56:28,734 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:56:28,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1761799133] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:56:28,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87524041] [2022-11-03 03:56:28,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:56:28,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:56:28,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:56:28,736 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:56:28,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2022-11-03 03:56:29,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:56:29,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 03:56:29,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:56:29,169 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:56:29,315 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:56:29,325 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 03:56:29,420 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2022-11-03 03:56:29,430 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 03:56:29,781 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-03 03:56:29,786 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 03:56:29,822 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:56:29,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:56:35,677 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:56:35,677 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87524041] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:56:35,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 03:56:35,678 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 16, 15, 16, 15] total 37 [2022-11-03 03:56:35,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073925302] [2022-11-03 03:56:35,678 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 03:56:35,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-03 03:56:35,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:56:35,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-03 03:56:35,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1300, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 03:56:35,680 INFO L87 Difference]: Start difference. First operand 488 states and 797 transitions. Second operand has 38 states, 32 states have (on average 2.21875) internal successors, (71), 27 states have internal predecessors, (71), 12 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 11 states have call predecessors, (13), 7 states have call successors, (13) [2022-11-03 03:56:55,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:56:55,999 INFO L93 Difference]: Finished difference Result 533 states and 854 transitions. [2022-11-03 03:56:56,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-03 03:56:56,001 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 32 states have (on average 2.21875) internal successors, (71), 27 states have internal predecessors, (71), 12 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 11 states have call predecessors, (13), 7 states have call successors, (13) Word has length 45 [2022-11-03 03:56:56,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:56:56,006 INFO L225 Difference]: With dead ends: 533 [2022-11-03 03:56:56,006 INFO L226 Difference]: Without dead ends: 533 [2022-11-03 03:56:56,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 220 SyntacticMatches, 8 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 889 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=365, Invalid=3541, Unknown=0, NotChecked=0, Total=3906 [2022-11-03 03:56:56,008 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 224 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 2457 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 2637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 2457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 13.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:56:56,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 459 Invalid, 2637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 2457 Invalid, 0 Unknown, 92 Unchecked, 13.1s Time] [2022-11-03 03:56:56,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2022-11-03 03:56:56,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 518. [2022-11-03 03:56:56,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 518 states, 363 states have (on average 1.1680440771349863) internal successors, (424), 393 states have internal predecessors, (424), 74 states have call successors, (74), 32 states have call predecessors, (74), 65 states have return successors, (336), 92 states have call predecessors, (336), 74 states have call successors, (336) [2022-11-03 03:56:56,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 518 states to 518 states and 834 transitions. [2022-11-03 03:56:56,041 INFO L78 Accepts]: Start accepts. Automaton has 518 states and 834 transitions. Word has length 45 [2022-11-03 03:56:56,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:56:56,041 INFO L495 AbstractCegarLoop]: Abstraction has 518 states and 834 transitions. [2022-11-03 03:56:56,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 32 states have (on average 2.21875) internal successors, (71), 27 states have internal predecessors, (71), 12 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 11 states have call predecessors, (13), 7 states have call successors, (13) [2022-11-03 03:56:56,042 INFO L276 IsEmpty]: Start isEmpty. Operand 518 states and 834 transitions. [2022-11-03 03:56:56,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-03 03:56:56,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:56:56,044 INFO L195 NwaCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2022-11-03 03:56:56,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2022-11-03 03:56:56,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (73)] Forceful destruction successful, exit code 0 [2022-11-03 03:56:56,465 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (74)] Forceful destruction successful, exit code 0 [2022-11-03 03:56:56,657 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:56:56,657 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting nondet_treeErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:56:56,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:56:56,658 INFO L85 PathProgramCache]: Analyzing trace with hash -1818958154, now seen corresponding path program 4 times [2022-11-03 03:56:56,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:56:56,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [594495739] [2022-11-03 03:56:56,659 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:56:56,659 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:56:56,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:56:56,660 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:56:56,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2022-11-03 03:56:57,246 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:56:57,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:56:57,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 03:56:57,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:56:57,294 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:57:16,442 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 03:57:16,617 INFO L356 Elim1Store]: treesize reduction 88, result has 29.6 percent of original size [2022-11-03 03:57:16,617 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 25 treesize of output 52 [2022-11-03 03:57:16,664 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 63 refuted. 3 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-03 03:57:16,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:57:17,376 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:57:17,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [594495739] [2022-11-03 03:57:17,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [594495739] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:57:17,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1532378069] [2022-11-03 03:57:17,377 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:57:17,377 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:57:17,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:57:17,378 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:57:17,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2022-11-03 03:57:18,432 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:57:18,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:57:18,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 03:57:18,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:57:18,482 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:58:02,134 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 03:58:02,307 INFO L356 Elim1Store]: treesize reduction 82, result has 34.4 percent of original size [2022-11-03 03:58:02,307 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 38 treesize of output 71 [2022-11-03 03:58:02,395 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 63 refuted. 3 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-03 03:58:02,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:58:03,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1532378069] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:58:03,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804241171] [2022-11-03 03:58:03,007 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:58:03,008 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:58:03,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:58:03,009 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:58:03,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2022-11-03 03:58:03,499 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:58:03,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:58:03,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 03:58:03,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:58:03,515 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:58:27,534 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 03:58:27,535 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 03:58:27,674 INFO L356 Elim1Store]: treesize reduction 70, result has 32.0 percent of original size [2022-11-03 03:58:27,674 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 20 treesize of output 45 [2022-11-03 03:58:27,712 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 57 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-03 03:58:27,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:58:28,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804241171] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:58:28,304 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:58:28,304 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-03 03:58:28,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235815645] [2022-11-03 03:58:28,304 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:58:28,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 03:58:28,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 03:58:28,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 03:58:28,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=164, Unknown=25, NotChecked=0, Total=240 [2022-11-03 03:58:28,306 INFO L87 Difference]: Start difference. First operand 518 states and 834 transitions. Second operand has 15 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 12 states have internal predecessors, (48), 10 states have call successors, (11), 2 states have call predecessors, (11), 7 states have return successors, (16), 11 states have call predecessors, (16), 9 states have call successors, (16) [2022-11-03 03:59:24,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:59:24,294 INFO L93 Difference]: Finished difference Result 527 states and 900 transitions. [2022-11-03 03:59:24,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 03:59:24,296 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 12 states have internal predecessors, (48), 10 states have call successors, (11), 2 states have call predecessors, (11), 7 states have return successors, (16), 11 states have call predecessors, (16), 9 states have call successors, (16) Word has length 53 [2022-11-03 03:59:24,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:59:24,300 INFO L225 Difference]: With dead ends: 527 [2022-11-03 03:59:24,300 INFO L226 Difference]: Without dead ends: 527 [2022-11-03 03:59:24,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 144 SyntacticMatches, 21 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 141.7s TimeCoverageRelationStatistics Valid=116, Invalid=305, Unknown=41, NotChecked=0, Total=462 [2022-11-03 03:59:24,301 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 56 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 361 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:59:24,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 162 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 85 Invalid, 0 Unknown, 361 Unchecked, 0.3s Time] [2022-11-03 03:59:24,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2022-11-03 03:59:24,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 526. [2022-11-03 03:59:24,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 526 states, 369 states have (on average 1.1680216802168022) internal successors, (431), 398 states have internal predecessors, (431), 75 states have call successors, (75), 32 states have call predecessors, (75), 66 states have return successors, (394), 95 states have call predecessors, (394), 75 states have call successors, (394) [2022-11-03 03:59:24,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 900 transitions. [2022-11-03 03:59:24,336 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 900 transitions. Word has length 53 [2022-11-03 03:59:24,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:59:24,336 INFO L495 AbstractCegarLoop]: Abstraction has 526 states and 900 transitions. [2022-11-03 03:59:24,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 12 states have internal predecessors, (48), 10 states have call successors, (11), 2 states have call predecessors, (11), 7 states have return successors, (16), 11 states have call predecessors, (16), 9 states have call successors, (16) [2022-11-03 03:59:24,337 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 900 transitions. [2022-11-03 03:59:24,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-03 03:59:24,339 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:59:24,340 INFO L195 NwaCegarLoop]: trace histogram [7, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2022-11-03 03:59:24,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2022-11-03 03:59:24,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (76)] Forceful destruction successful, exit code 0 [2022-11-03 03:59:24,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (77)] Forceful destruction successful, exit code 0 [2022-11-03 03:59:24,953 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt [2022-11-03 03:59:24,953 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting nondet_treeErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 03:59:24,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:59:24,954 INFO L85 PathProgramCache]: Analyzing trace with hash -1818958153, now seen corresponding path program 4 times [2022-11-03 03:59:24,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 03:59:24,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [913153138] [2022-11-03 03:59:24,954 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:59:24,954 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 03:59:24,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 03:59:24,955 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 03:59:24,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2022-11-03 03:59:25,557 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:59:25,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:59:25,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 03:59:25,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:59:25,602 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:59:25,613 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:59:34,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:59:34,494 INFO L356 Elim1Store]: treesize reduction 67, result has 25.6 percent of original size [2022-11-03 03:59:34,494 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 18 treesize of output 31 [2022-11-03 03:59:34,528 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 03:59:34,528 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 03:59:34,651 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 69 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-03 03:59:34,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:59:35,491 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 03:59:35,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [913153138] [2022-11-03 03:59:35,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [913153138] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:59:35,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [451340070] [2022-11-03 03:59:35,491 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:59:35,492 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 03:59:35,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 03:59:35,493 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 03:59:35,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2022-11-03 03:59:36,601 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:59:36,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:59:36,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-03 03:59:36,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:59:36,620 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 03:59:36,631 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:59:49,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:59:49,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:59:49,239 INFO L356 Elim1Store]: treesize reduction 47, result has 36.5 percent of original size [2022-11-03 03:59:49,240 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 18 treesize of output 35 [2022-11-03 03:59:49,350 INFO L356 Elim1Store]: treesize reduction 17, result has 45.2 percent of original size [2022-11-03 03:59:49,351 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 38 [2022-11-03 03:59:49,479 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 7 proven. 76 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-03 03:59:49,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:59:52,104 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse0 (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset))) (and (or (forall ((v_nondet_tree_~n~0.base_595 (_ BitVec 32)) (v_nondet_tree_~n~0.base_596 (_ BitVec 32)) (v_ArrVal_5802 (_ BitVec 1))) (or (not (= (_ bv0 1) (select (store |c_#valid| v_nondet_tree_~n~0.base_595 v_ArrVal_5802) v_nondet_tree_~n~0.base_596))) (not (= (select |c_#valid| v_nondet_tree_~n~0.base_595) (_ bv0 1))))) (bvule (bvadd (_ bv4 32) c_nondet_tree_~n~0.offset) .cse0)) (forall ((v_nondet_tree_~n~0.base_595 (_ BitVec 32))) (or (not (= (select |c_#valid| v_nondet_tree_~n~0.base_595) (_ bv0 1))) (forall ((v_nondet_tree_~n~0.base_596 (_ BitVec 32)) (v_ArrVal_5802 (_ BitVec 1))) (or (not (= (_ bv0 1) (select (store |c_#valid| v_nondet_tree_~n~0.base_595 v_ArrVal_5802) v_nondet_tree_~n~0.base_596))) (forall ((v_ArrVal_5804 (_ BitVec 32)) (v_nondet_tree_~n~0.base_597 (_ BitVec 32)) (v_ArrVal_5803 (_ BitVec 32))) (bvule .cse0 (select (store (store (store |c_#length| v_nondet_tree_~n~0.base_595 v_ArrVal_5804) v_nondet_tree_~n~0.base_596 v_ArrVal_5803) v_nondet_tree_~n~0.base_597 (_ bv12 32)) c_nondet_tree_~n~0.base))))))))) is different from false [2022-11-03 03:59:52,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [451340070] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:59:52,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665126729] [2022-11-03 03:59:52,110 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:59:52,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:59:52,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:59:52,112 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:59:52,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2022-11-03 03:59:52,628 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:59:52,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:59:52,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-03 03:59:52,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:59:52,643 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 03:59:52,653 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 04:00:09,431 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 04:00:09,431 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 04:00:14,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 04:00:14,509 INFO L356 Elim1Store]: treesize reduction 53, result has 25.4 percent of original size [2022-11-03 04:00:14,510 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 31 [2022-11-03 04:00:14,550 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-03 04:00:14,550 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 13 [2022-11-03 04:00:14,747 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 72 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-03 04:00:14,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:00:15,524 INFO L356 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-11-03 04:00:15,524 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 14 [2022-11-03 04:00:17,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665126729] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:00:17,038 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 04:00:17,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 11] total 18 [2022-11-03 04:00:17,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317627056] [2022-11-03 04:00:17,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 04:00:17,039 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 04:00:17,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 04:00:17,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 04:00:17,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=344, Unknown=18, NotChecked=38, Total=462 [2022-11-03 04:00:17,039 INFO L87 Difference]: Start difference. First operand 526 states and 900 transitions. Second operand has 19 states, 18 states have (on average 3.5555555555555554) internal successors, (64), 16 states have internal predecessors, (64), 13 states have call successors, (15), 3 states have call predecessors, (15), 9 states have return successors, (19), 10 states have call predecessors, (19), 12 states have call successors, (19) [2022-11-03 04:00:59,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:00:59,869 INFO L93 Difference]: Finished difference Result 561 states and 965 transitions. [2022-11-03 04:00:59,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 04:00:59,871 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.5555555555555554) internal successors, (64), 16 states have internal predecessors, (64), 13 states have call successors, (15), 3 states have call predecessors, (15), 9 states have return successors, (19), 10 states have call predecessors, (19), 12 states have call successors, (19) Word has length 53 [2022-11-03 04:00:59,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:00:59,875 INFO L225 Difference]: With dead ends: 561 [2022-11-03 04:00:59,875 INFO L226 Difference]: Without dead ends: 561 [2022-11-03 04:00:59,876 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 140 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 87.6s TimeCoverageRelationStatistics Valid=155, Invalid=686, Unknown=33, NotChecked=56, Total=930 [2022-11-03 04:00:59,877 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 51 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 749 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 525 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 04:00:59,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 327 Invalid, 749 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 216 Invalid, 0 Unknown, 525 Unchecked, 0.6s Time] [2022-11-03 04:00:59,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2022-11-03 04:00:59,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 561. [2022-11-03 04:00:59,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 561 states, 394 states have (on average 1.1548223350253808) internal successors, (455), 423 states have internal predecessors, (455), 80 states have call successors, (80), 32 states have call predecessors, (80), 71 states have return successors, (430), 105 states have call predecessors, (430), 80 states have call successors, (430) [2022-11-03 04:00:59,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 561 states to 561 states and 965 transitions. [2022-11-03 04:00:59,926 INFO L78 Accepts]: Start accepts. Automaton has 561 states and 965 transitions. Word has length 53 [2022-11-03 04:00:59,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:00:59,927 INFO L495 AbstractCegarLoop]: Abstraction has 561 states and 965 transitions. [2022-11-03 04:00:59,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.5555555555555554) internal successors, (64), 16 states have internal predecessors, (64), 13 states have call successors, (15), 3 states have call predecessors, (15), 9 states have return successors, (19), 10 states have call predecessors, (19), 12 states have call successors, (19) [2022-11-03 04:00:59,927 INFO L276 IsEmpty]: Start isEmpty. Operand 561 states and 965 transitions. [2022-11-03 04:00:59,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-03 04:00:59,931 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:00:59,931 INFO L195 NwaCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:00:59,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (80)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:00,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:00,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:00,541 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:00,541 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting checkErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 04:01:00,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:00,542 INFO L85 PathProgramCache]: Analyzing trace with hash 344803173, now seen corresponding path program 1 times [2022-11-03 04:01:00,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 04:01:00,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2018206836] [2022-11-03 04:01:00,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:00,547 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 04:01:00,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 04:01:00,548 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 04:01:00,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2022-11-03 04:01:00,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:00,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 04:01:00,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:00,986 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 04:01:01,391 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:01,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:01,814 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:01,814 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 04:01:01,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2018206836] [2022-11-03 04:01:01,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2018206836] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:01,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1855472492] [2022-11-03 04:01:01,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:01,815 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 04:01:01,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 04:01:01,819 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 04:01:01,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2022-11-03 04:01:02,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:02,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 04:01:02,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:02,654 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 04:01:02,915 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:02,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:03,330 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:03,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1855472492] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:03,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697046008] [2022-11-03 04:01:03,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:03,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:03,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:03,332 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:03,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2022-11-03 04:01:03,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:03,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 04:01:03,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:04,008 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-03 04:01:04,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:04,264 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-03 04:01:04,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697046008] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:04,265 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 04:01:04,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 8, 9, 8] total 10 [2022-11-03 04:01:04,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136321557] [2022-11-03 04:01:04,265 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:04,266 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 04:01:04,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 04:01:04,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 04:01:04,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-11-03 04:01:04,267 INFO L87 Difference]: Start difference. First operand 561 states and 965 transitions. Second operand has 11 states, 10 states have (on average 4.7) internal successors, (47), 9 states have internal predecessors, (47), 4 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-03 04:01:04,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:04,994 INFO L93 Difference]: Finished difference Result 580 states and 987 transitions. [2022-11-03 04:01:04,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 04:01:04,995 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.7) internal successors, (47), 9 states have internal predecessors, (47), 4 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 48 [2022-11-03 04:01:04,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:04,999 INFO L225 Difference]: With dead ends: 580 [2022-11-03 04:01:05,000 INFO L226 Difference]: Without dead ends: 580 [2022-11-03 04:01:05,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 265 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-11-03 04:01:05,002 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 110 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 144 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:05,003 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 163 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 148 Invalid, 0 Unknown, 144 Unchecked, 0.5s Time] [2022-11-03 04:01:05,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2022-11-03 04:01:05,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 572. [2022-11-03 04:01:05,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 572 states, 404 states have (on average 1.1658415841584158) internal successors, (471), 433 states have internal predecessors, (471), 80 states have call successors, (80), 33 states have call predecessors, (80), 72 states have return successors, (431), 105 states have call predecessors, (431), 80 states have call successors, (431) [2022-11-03 04:01:05,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 572 states to 572 states and 982 transitions. [2022-11-03 04:01:05,037 INFO L78 Accepts]: Start accepts. Automaton has 572 states and 982 transitions. Word has length 48 [2022-11-03 04:01:05,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:05,038 INFO L495 AbstractCegarLoop]: Abstraction has 572 states and 982 transitions. [2022-11-03 04:01:05,038 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.7) internal successors, (47), 9 states have internal predecessors, (47), 4 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-03 04:01:05,038 INFO L276 IsEmpty]: Start isEmpty. Operand 572 states and 982 transitions. [2022-11-03 04:01:05,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-03 04:01:05,041 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:05,041 INFO L195 NwaCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 04:01:05,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (82)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:05,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (83)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:05,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:05,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:05,658 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting checkErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 04:01:05,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:05,659 INFO L85 PathProgramCache]: Analyzing trace with hash 344803174, now seen corresponding path program 1 times [2022-11-03 04:01:05,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 04:01:05,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1094767352] [2022-11-03 04:01:05,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:05,659 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 04:01:05,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 04:01:05,661 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 04:01:05,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2022-11-03 04:01:06,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:06,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 04:01:06,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:06,118 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 04:01:06,681 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:06,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:08,483 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:08,483 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 04:01:08,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1094767352] [2022-11-03 04:01:08,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1094767352] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:08,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [252337511] [2022-11-03 04:01:08,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:08,484 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 04:01:08,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 04:01:08,486 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 04:01:08,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (86)] Waiting until timeout for monitored process [2022-11-03 04:01:09,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:09,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 04:01:09,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:09,350 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 04:01:09,691 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:09,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:11,366 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:11,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [252337511] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:11,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390092243] [2022-11-03 04:01:11,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 04:01:11,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:11,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:01:11,367 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:01:11,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2022-11-03 04:01:11,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 04:01:11,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 04:01:11,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:11,829 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-03 04:01:12,172 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:12,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:14,178 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 04:01:14,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390092243] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 04:01:14,179 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-03 04:01:14,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 8, 9, 8] total 16 [2022-11-03 04:01:14,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062037499] [2022-11-03 04:01:14,179 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-03 04:01:14,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-03 04:01:14,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-03 04:01:14,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-03 04:01:14,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2022-11-03 04:01:14,181 INFO L87 Difference]: Start difference. First operand 572 states and 982 transitions. Second operand has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 6 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) [2022-11-03 04:01:17,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 04:01:17,964 INFO L93 Difference]: Finished difference Result 610 states and 1029 transitions. [2022-11-03 04:01:17,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 04:01:17,971 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 6 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) Word has length 48 [2022-11-03 04:01:17,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 04:01:17,976 INFO L225 Difference]: With dead ends: 610 [2022-11-03 04:01:17,976 INFO L226 Difference]: Without dead ends: 610 [2022-11-03 04:01:17,976 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 257 SyntacticMatches, 10 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2022-11-03 04:01:17,977 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 118 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 667 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-03 04:01:17,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 303 Invalid, 855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 667 Invalid, 0 Unknown, 160 Unchecked, 3.3s Time] [2022-11-03 04:01:17,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2022-11-03 04:01:18,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 599. [2022-11-03 04:01:18,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 599 states, 424 states have (on average 1.1674528301886793) internal successors, (495), 454 states have internal predecessors, (495), 83 states have call successors, (83), 36 states have call predecessors, (83), 76 states have return successors, (442), 108 states have call predecessors, (442), 83 states have call successors, (442) [2022-11-03 04:01:18,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 599 states to 599 states and 1020 transitions. [2022-11-03 04:01:18,009 INFO L78 Accepts]: Start accepts. Automaton has 599 states and 1020 transitions. Word has length 48 [2022-11-03 04:01:18,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 04:01:18,009 INFO L495 AbstractCegarLoop]: Abstraction has 599 states and 1020 transitions. [2022-11-03 04:01:18,009 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.375) internal successors, (54), 13 states have internal predecessors, (54), 6 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) [2022-11-03 04:01:18,010 INFO L276 IsEmpty]: Start isEmpty. Operand 599 states and 1020 transitions. [2022-11-03 04:01:18,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-03 04:01:18,012 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 04:01:18,013 INFO L195 NwaCegarLoop]: trace histogram [9, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 1, 1, 1, 1] [2022-11-03 04:01:18,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (85)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:18,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (86)] Forceful destruction successful, exit code 0 [2022-11-03 04:01:18,487 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2022-11-03 04:01:18,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:01:18,633 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting nondet_treeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [maxErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, maxErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 17 more)] === [2022-11-03 04:01:18,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 04:01:18,633 INFO L85 PathProgramCache]: Analyzing trace with hash 434434201, now seen corresponding path program 4 times [2022-11-03 04:01:18,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-03 04:01:18,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1201274477] [2022-11-03 04:01:18,634 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:01:18,634 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-11-03 04:01:18,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat [2022-11-03 04:01:18,635 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-03 04:01:18,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/mathsat -unsat_core_generation=3 (88)] Waiting until timeout for monitored process [2022-11-03 04:01:19,273 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:01:19,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:01:19,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-03 04:01:19,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:19,297 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 04:01:28,214 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 04:01:28,352 INFO L356 Elim1Store]: treesize reduction 88, result has 29.6 percent of original size [2022-11-03 04:01:28,352 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 25 treesize of output 52 [2022-11-03 04:01:28,400 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 64 proven. 75 refuted. 6 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-03 04:01:28,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:01:29,273 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-03 04:01:29,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1201274477] [2022-11-03 04:01:29,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1201274477] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:01:29,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2050793315] [2022-11-03 04:01:29,273 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:01:29,273 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-03 04:01:29,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 [2022-11-03 04:01:29,274 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-03 04:01:29,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/cvc4 --incremental --print-success --lang smt (89)] Waiting until timeout for monitored process [2022-11-03 04:01:30,411 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:01:30,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:01:30,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-03 04:01:30,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 04:01:30,432 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 7 [2022-11-03 04:02:02,337 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 04:02:02,493 INFO L356 Elim1Store]: treesize reduction 82, result has 34.4 percent of original size [2022-11-03 04:02:02,494 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 38 treesize of output 71 [2022-11-03 04:02:02,566 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 64 proven. 75 refuted. 6 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-03 04:02:02,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 04:02:03,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2050793315] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 04:02:03,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896467886] [2022-11-03 04:02:03,719 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 04:02:03,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 04:02:03,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 04:02:03,720 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 04:02:03,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_55f68b15-c026-46b8-96b4-a9e236a8b64c/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2022-11-03 04:02:04,309 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 04:02:04,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 04:02:04,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 04:02:04,319 INFO L286 TraceCheckSpWp]: Computing forward predicates...