./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 6b4ec56b 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_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0d8799100fd609ab67add98408724f155026fd97a78e0a4112bb89c435f95463 --- 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-6b4ec56 [2022-11-20 19:58:40,771 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 19:58:40,773 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 19:58:40,798 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 19:58:40,798 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 19:58:40,800 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 19:58:40,801 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 19:58:40,803 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 19:58:40,804 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 19:58:40,805 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 19:58:40,806 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 19:58:40,807 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 19:58:40,808 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 19:58:40,809 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 19:58:40,810 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 19:58:40,811 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 19:58:40,812 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 19:58:40,813 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 19:58:40,814 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 19:58:40,816 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 19:58:40,817 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 19:58:40,819 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 19:58:40,820 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 19:58:40,821 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 19:58:40,824 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 19:58:40,825 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 19:58:40,825 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 19:58:40,826 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 19:58:40,826 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 19:58:40,827 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 19:58:40,828 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 19:58:40,829 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 19:58:40,829 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 19:58:40,830 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 19:58:40,831 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 19:58:40,831 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 19:58:40,832 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 19:58:40,833 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 19:58:40,833 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 19:58:40,834 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 19:58:40,835 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 19:58:40,836 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-20 19:58:40,873 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 19:58:40,873 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 19:58:40,873 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 19:58:40,874 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 19:58:40,874 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 19:58:40,875 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 19:58:40,875 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 19:58:40,875 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 19:58:40,876 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 19:58:40,876 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 19:58:40,876 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 19:58:40,876 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 19:58:40,877 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 19:58:40,877 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 19:58:40,877 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 19:58:40,877 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 19:58:40,878 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 19:58:40,878 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 19:58:40,879 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-20 19:58:40,879 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-20 19:58:40,879 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 19:58:40,880 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 19:58:40,880 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-20 19:58:40,880 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 19:58:40,881 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 19:58:40,881 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 19:58:40,881 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-20 19:58:40,881 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-20 19:58:40,882 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-20 19:58:40,882 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 19:58:40,882 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-20 19:58:40,883 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 19:58:40,883 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 19:58:40,883 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 19:58:40,883 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 19:58:40,884 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 19:58:40,884 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 19:58:40,884 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 19:58:40,885 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 19:58:40,885 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 19:58:40,885 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 19:58:40,885 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 19:58:40,897 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_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0d8799100fd609ab67add98408724f155026fd97a78e0a4112bb89c435f95463 [2022-11-20 19:58:41,151 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 19:58:41,173 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 19:58:41,176 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 19:58:41,177 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 19:58:41,178 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 19:58:41,179 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c [2022-11-20 19:58:44,247 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 19:58:44,482 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 19:58:44,483 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c [2022-11-20 19:58:44,490 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/data/16c64a370/4aa482f81b7a46b1871c9bd20bc75e37/FLAG301ecf3ed [2022-11-20 19:58:44,507 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/data/16c64a370/4aa482f81b7a46b1871c9bd20bc75e37 [2022-11-20 19:58:44,510 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 19:58:44,511 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 19:58:44,531 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 19:58:44,532 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 19:58:44,535 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 19:58:44,536 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:58:44" (1/1) ... [2022-11-20 19:58:44,537 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68d3b3fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:44, skipping insertion in model container [2022-11-20 19:58:44,538 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:58:44" (1/1) ... [2022-11-20 19:58:44,545 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 19:58:44,564 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 19:58:44,785 WARN L237 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_dd59d9a1-f073-489e-b851-10ced61ff555/sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c[2486,2499] [2022-11-20 19:58:44,804 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 19:58:44,818 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) [2022-11-20 19:58:44,819 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@5d35779d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:44, skipping insertion in model container [2022-11-20 19:58:44,819 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 19:58:44,820 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2022-11-20 19:58:44,822 INFO L158 Benchmark]: Toolchain (without parser) took 309.42ms. Allocated memory was 130.0MB in the beginning and 172.0MB in the end (delta: 41.9MB). Free memory was 66.8MB in the beginning and 137.5MB in the end (delta: -70.6MB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-20 19:58:44,823 INFO L158 Benchmark]: CDTParser took 0.22ms. Allocated memory is still 130.0MB. Free memory was 96.1MB in the beginning and 95.9MB in the end (delta: 151.1kB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-20 19:58:44,824 INFO L158 Benchmark]: CACSL2BoogieTranslator took 288.30ms. Allocated memory is still 172.0MB. Free memory was 143.3MB in the beginning and 137.5MB in the end (delta: 5.9MB). Peak memory consumption was 6.6MB. Max. memory is 16.1GB. [2022-11-20 19:58:44,826 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22ms. Allocated memory is still 130.0MB. Free memory was 96.1MB in the beginning and 95.9MB in the end (delta: 151.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 288.30ms. Allocated memory is still 172.0MB. Free memory was 143.3MB in the beginning and 137.5MB in the end (delta: 5.9MB). Peak memory consumption was 6.6MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 107]: 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_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0d8799100fd609ab67add98408724f155026fd97a78e0a4112bb89c435f95463 --- 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-6b4ec56 [2022-11-20 19:58:47,145 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 19:58:47,148 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 19:58:47,199 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 19:58:47,200 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 19:58:47,201 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 19:58:47,202 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 19:58:47,204 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 19:58:47,205 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 19:58:47,206 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 19:58:47,207 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 19:58:47,208 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 19:58:47,208 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 19:58:47,209 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 19:58:47,210 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 19:58:47,212 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 19:58:47,212 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 19:58:47,213 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 19:58:47,215 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 19:58:47,217 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 19:58:47,218 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 19:58:47,219 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 19:58:47,221 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 19:58:47,221 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 19:58:47,225 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 19:58:47,225 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 19:58:47,226 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 19:58:47,227 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 19:58:47,227 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 19:58:47,228 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 19:58:47,229 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 19:58:47,229 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 19:58:47,230 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 19:58:47,231 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 19:58:47,232 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 19:58:47,232 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 19:58:47,233 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 19:58:47,233 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 19:58:47,233 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 19:58:47,234 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 19:58:47,235 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 19:58:47,236 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2022-11-20 19:58:47,260 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 19:58:47,260 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 19:58:47,261 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 19:58:47,261 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 19:58:47,262 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 19:58:47,262 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 19:58:47,262 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 19:58:47,262 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 19:58:47,263 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 19:58:47,263 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 19:58:47,263 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 19:58:47,263 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 19:58:47,264 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-20 19:58:47,264 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-20 19:58:47,264 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 19:58:47,265 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 19:58:47,265 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-20 19:58:47,265 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 19:58:47,265 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 19:58:47,265 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 19:58:47,265 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-20 19:58:47,266 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-20 19:58:47,266 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-20 19:58:47,266 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 19:58:47,266 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-20 19:58:47,266 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-11-20 19:58:47,267 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-11-20 19:58:47,267 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 19:58:47,267 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 19:58:47,267 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 19:58:47,267 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-20 19:58:47,267 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 19:58:47,268 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 19:58:47,268 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 19:58:47,268 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 19:58:47,268 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2022-11-20 19:58:47,268 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-11-20 19:58:47,269 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 19:58:47,269 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-11-20 19:58:47,269 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_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0d8799100fd609ab67add98408724f155026fd97a78e0a4112bb89c435f95463 [2022-11-20 19:58:47,670 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 19:58:47,693 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 19:58:47,695 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 19:58:47,697 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 19:58:47,697 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 19:58:47,698 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c [2022-11-20 19:58:50,812 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 19:58:51,031 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 19:58:51,032 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c [2022-11-20 19:58:51,040 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/data/155a07797/08f0b5d3fc664bbe88623954e905357f/FLAG718ebbadc [2022-11-20 19:58:51,058 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/data/155a07797/08f0b5d3fc664bbe88623954e905357f [2022-11-20 19:58:51,060 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 19:58:51,062 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 19:58:51,063 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 19:58:51,064 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 19:58:51,067 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 19:58:51,068 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,069 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7aa989a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51, skipping insertion in model container [2022-11-20 19:58:51,069 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,077 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 19:58:51,096 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 19:58:51,323 WARN L237 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_dd59d9a1-f073-489e-b851-10ced61ff555/sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c[2486,2499] [2022-11-20 19:58:51,338 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 19:58:51,361 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2022-11-20 19:58:51,373 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 19:58:51,397 WARN L237 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_dd59d9a1-f073-489e-b851-10ced61ff555/sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c[2486,2499] [2022-11-20 19:58:51,405 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 19:58:51,418 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 19:58:51,463 WARN L237 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_dd59d9a1-f073-489e-b851-10ced61ff555/sv-benchmarks/c/weaver/popl20-more-min-le-max.wvr.c[2486,2499] [2022-11-20 19:58:51,468 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 19:58:51,490 INFO L208 MainTranslator]: Completed translation [2022-11-20 19:58:51,490 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51 WrapperNode [2022-11-20 19:58:51,491 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 19:58:51,492 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 19:58:51,492 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 19:58:51,493 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 19:58:51,501 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,525 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,560 INFO L138 Inliner]: procedures = 26, calls = 43, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 102 [2022-11-20 19:58:51,561 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 19:58:51,562 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 19:58:51,562 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 19:58:51,562 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 19:58:51,572 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,573 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,592 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,592 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,610 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,614 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,622 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,624 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,626 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 19:58:51,632 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 19:58:51,633 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 19:58:51,633 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 19:58:51,634 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (1/1) ... [2022-11-20 19:58:51,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 19:58:51,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:58:51,676 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 19:58:51,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 19:58:51,717 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 19:58:51,717 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-11-20 19:58:51,717 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-20 19:58:51,717 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2022-11-20 19:58:51,717 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2022-11-20 19:58:51,717 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2022-11-20 19:58:51,718 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2022-11-20 19:58:51,718 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2022-11-20 19:58:51,718 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2022-11-20 19:58:51,718 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2022-11-20 19:58:51,718 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2022-11-20 19:58:51,718 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2022-11-20 19:58:51,719 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-20 19:58:51,719 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 19:58:51,719 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 19:58:51,719 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-20 19:58:51,719 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2022-11-20 19:58:51,721 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2022-11-20 19:58:51,845 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 19:58:51,847 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 19:58:52,448 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 19:58:52,584 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 19:58:52,585 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-20 19:58:52,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:58:52 BoogieIcfgContainer [2022-11-20 19:58:52,587 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 19:58:52,590 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 19:58:52,590 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 19:58:52,593 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 19:58:52,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 07:58:51" (1/3) ... [2022-11-20 19:58:52,595 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c1c4f25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:58:52, skipping insertion in model container [2022-11-20 19:58:52,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 07:58:51" (2/3) ... [2022-11-20 19:58:52,595 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c1c4f25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 07:58:52, skipping insertion in model container [2022-11-20 19:58:52,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 07:58:52" (3/3) ... [2022-11-20 19:58:52,596 INFO L112 eAbstractionObserver]: Analyzing ICFG popl20-more-min-le-max.wvr.c [2022-11-20 19:58:52,616 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 19:58:52,617 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 28 error locations. [2022-11-20 19:58:52,617 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2022-11-20 19:58:52,715 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2022-11-20 19:58:52,749 INFO L115 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2022-11-20 19:58:52,763 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 177 places, 177 transitions, 378 flow [2022-11-20 19:58:52,766 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 177 places, 177 transitions, 378 flow [2022-11-20 19:58:52,768 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 177 places, 177 transitions, 378 flow [2022-11-20 19:58:52,833 INFO L130 PetriNetUnfolder]: 10/174 cut-off events. [2022-11-20 19:58:52,833 INFO L131 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2022-11-20 19:58:52,839 INFO L83 FinitePrefix]: Finished finitePrefix Result has 187 conditions, 174 events. 10/174 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 174 event pairs, 0 based on Foata normal form. 0/136 useless extension candidates. Maximal degree in co-relation 134. Up to 2 conditions per place. [2022-11-20 19:58:52,842 INFO L119 LiptonReduction]: Number of co-enabled transitions 1742 [2022-11-20 19:59:21,628 INFO L134 LiptonReduction]: Checked pairs total: 2788 [2022-11-20 19:59:21,628 INFO L136 LiptonReduction]: Total number of compositions: 183 [2022-11-20 19:59:21,637 INFO L113 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 60 places, 53 transitions, 130 flow [2022-11-20 19:59:21,719 INFO L135 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 694 states, 538 states have (on average 3.87546468401487) internal successors, (2085), 693 states have internal predecessors, (2085), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:21,738 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 19:59:21,745 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;@4db1326b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 19:59:21,745 INFO L358 AbstractCegarLoop]: Starting to check reachability of 39 error locations. [2022-11-20 19:59:21,750 INFO L276 IsEmpty]: Start isEmpty. Operand has 694 states, 538 states have (on average 3.87546468401487) internal successors, (2085), 693 states have internal predecessors, (2085), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:21,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-20 19:59:21,755 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:21,755 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-20 19:59:21,756 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:21,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:21,761 INFO L85 PathProgramCache]: Analyzing trace with hash 22077, now seen corresponding path program 1 times [2022-11-20 19:59:21,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:21,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [920127596] [2022-11-20 19:59:21,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:21,776 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:21,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:21,782 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:21,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-11-20 19:59:21,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:21,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-20 19:59:21,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:21,932 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:21,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:21,935 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:21,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [920127596] [2022-11-20 19:59:21,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [920127596] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:21,936 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:21,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 19:59:21,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940654158] [2022-11-20 19:59:21,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:21,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-20 19:59:21,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:21,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-20 19:59:21,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-20 19:59:21,986 INFO L87 Difference]: Start difference. First operand has 694 states, 538 states have (on average 3.87546468401487) internal successors, (2085), 693 states have internal predecessors, (2085), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 1 states have (on average 2.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:22,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:22,356 INFO L93 Difference]: Finished difference Result 379 states and 1114 transitions. [2022-11-20 19:59:22,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-20 19:59:22,359 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 1 states have (on average 2.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-20 19:59:22,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:22,390 INFO L225 Difference]: With dead ends: 379 [2022-11-20 19:59:22,390 INFO L226 Difference]: Without dead ends: 379 [2022-11-20 19:59:22,392 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-20 19:59:22,398 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:22,404 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 2 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 19:59:22,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2022-11-20 19:59:22,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 379. [2022-11-20 19:59:22,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 314 states have (on average 3.5477707006369426) internal successors, (1114), 378 states have internal predecessors, (1114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:22,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 1114 transitions. [2022-11-20 19:59:22,527 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 1114 transitions. Word has length 2 [2022-11-20 19:59:22,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:22,528 INFO L495 AbstractCegarLoop]: Abstraction has 379 states and 1114 transitions. [2022-11-20 19:59:22,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 1 states have (on average 2.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:22,530 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 1114 transitions. [2022-11-20 19:59:22,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-20 19:59:22,531 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:22,532 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-20 19:59:22,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:22,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:22,735 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:22,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:22,735 INFO L85 PathProgramCache]: Analyzing trace with hash 22078, now seen corresponding path program 1 times [2022-11-20 19:59:22,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:22,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [684864113] [2022-11-20 19:59:22,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:22,736 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:22,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:22,738 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:22,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-11-20 19:59:22,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:22,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 19:59:22,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:22,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:22,908 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:22,908 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:22,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [684864113] [2022-11-20 19:59:22,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [684864113] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:22,910 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:22,910 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 19:59:22,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371653631] [2022-11-20 19:59:22,910 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:22,911 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:22,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:22,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:22,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:22,913 INFO L87 Difference]: Start difference. First operand 379 states and 1114 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:23,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:23,197 INFO L93 Difference]: Finished difference Result 382 states and 1117 transitions. [2022-11-20 19:59:23,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:23,198 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-20 19:59:23,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:23,200 INFO L225 Difference]: With dead ends: 382 [2022-11-20 19:59:23,201 INFO L226 Difference]: Without dead ends: 382 [2022-11-20 19:59:23,201 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:23,202 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 2 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:23,202 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 4 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 19:59:23,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2022-11-20 19:59:23,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 380. [2022-11-20 19:59:23,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 380 states, 315 states have (on average 3.546031746031746) internal successors, (1117), 379 states have internal predecessors, (1117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:23,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 1117 transitions. [2022-11-20 19:59:23,223 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 1117 transitions. Word has length 2 [2022-11-20 19:59:23,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:23,223 INFO L495 AbstractCegarLoop]: Abstraction has 380 states and 1117 transitions. [2022-11-20 19:59:23,223 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:23,224 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 1117 transitions. [2022-11-20 19:59:23,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-20 19:59:23,224 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:23,224 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-20 19:59:23,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:23,450 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:23,451 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:23,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:23,452 INFO L85 PathProgramCache]: Analyzing trace with hash 21952, now seen corresponding path program 1 times [2022-11-20 19:59:23,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:23,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [243046509] [2022-11-20 19:59:23,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:23,452 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:23,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:23,456 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:23,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-11-20 19:59:23,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:23,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 19:59:23,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:23,645 INFO L321 Elim1Store]: treesize reduction 84, result has 33.9 percent of original size [2022-11-20 19:59:23,646 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 50 [2022-11-20 19:59:23,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:23,691 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:23,691 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:23,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [243046509] [2022-11-20 19:59:23,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [243046509] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:23,692 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:23,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 19:59:23,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114757618] [2022-11-20 19:59:23,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:23,693 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:23,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:23,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:23,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:23,695 INFO L87 Difference]: Start difference. First operand 380 states and 1117 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:23,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:23,901 INFO L93 Difference]: Finished difference Result 378 states and 1114 transitions. [2022-11-20 19:59:23,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:23,901 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-20 19:59:23,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:23,905 INFO L225 Difference]: With dead ends: 378 [2022-11-20 19:59:23,905 INFO L226 Difference]: Without dead ends: 378 [2022-11-20 19:59:23,905 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:23,907 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 39 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:23,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 2 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 19:59:23,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2022-11-20 19:59:23,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 378. [2022-11-20 19:59:23,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 315 states have (on average 3.5365079365079364) internal successors, (1114), 377 states have internal predecessors, (1114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:23,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 1114 transitions. [2022-11-20 19:59:23,945 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 1114 transitions. Word has length 2 [2022-11-20 19:59:23,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:23,946 INFO L495 AbstractCegarLoop]: Abstraction has 378 states and 1114 transitions. [2022-11-20 19:59:23,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:23,946 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 1114 transitions. [2022-11-20 19:59:23,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-20 19:59:23,946 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:23,947 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-20 19:59:23,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:24,157 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:24,158 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:24,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:24,159 INFO L85 PathProgramCache]: Analyzing trace with hash 21953, now seen corresponding path program 1 times [2022-11-20 19:59:24,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:24,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [141275646] [2022-11-20 19:59:24,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:24,159 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:24,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:24,161 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:24,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-11-20 19:59:24,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:24,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 19:59:24,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:24,393 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:24,393 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:24,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:24,437 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:24,437 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:24,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [141275646] [2022-11-20 19:59:24,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [141275646] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:24,437 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:24,437 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 19:59:24,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954961100] [2022-11-20 19:59:24,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:24,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:24,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:24,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:24,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:24,439 INFO L87 Difference]: Start difference. First operand 378 states and 1114 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:24,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:24,691 INFO L93 Difference]: Finished difference Result 378 states and 1113 transitions. [2022-11-20 19:59:24,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:24,696 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-20 19:59:24,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:24,699 INFO L225 Difference]: With dead ends: 378 [2022-11-20 19:59:24,700 INFO L226 Difference]: Without dead ends: 378 [2022-11-20 19:59:24,700 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:24,701 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:24,701 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 19:59:24,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2022-11-20 19:59:24,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 378. [2022-11-20 19:59:24,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 315 states have (on average 3.533333333333333) internal successors, (1113), 377 states have internal predecessors, (1113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:24,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 1113 transitions. [2022-11-20 19:59:24,721 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 1113 transitions. Word has length 2 [2022-11-20 19:59:24,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:24,721 INFO L495 AbstractCegarLoop]: Abstraction has 378 states and 1113 transitions. [2022-11-20 19:59:24,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:24,722 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 1113 transitions. [2022-11-20 19:59:24,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 19:59:24,722 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:24,722 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 19:59:24,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:24,935 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:24,935 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:24,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:24,936 INFO L85 PathProgramCache]: Analyzing trace with hash 684517, now seen corresponding path program 1 times [2022-11-20 19:59:24,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:24,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [982388070] [2022-11-20 19:59:24,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:24,937 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:24,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:24,938 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:24,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-11-20 19:59:25,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:25,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 19:59:25,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:25,155 INFO L321 Elim1Store]: treesize reduction 115, result has 16.1 percent of original size [2022-11-20 19:59:25,156 INFO L350 Elim1Store]: Elim1 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 6 case distinctions, treesize of input 38 treesize of output 47 [2022-11-20 19:59:25,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:25,291 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:25,291 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:25,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [982388070] [2022-11-20 19:59:25,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [982388070] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:25,292 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:25,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 19:59:25,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981685067] [2022-11-20 19:59:25,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:25,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:25,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:25,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:25,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:25,294 INFO L87 Difference]: Start difference. First operand 378 states and 1113 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:25,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:25,437 INFO L93 Difference]: Finished difference Result 377 states and 1112 transitions. [2022-11-20 19:59:25,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:25,438 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-20 19:59:25,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:25,441 INFO L225 Difference]: With dead ends: 377 [2022-11-20 19:59:25,441 INFO L226 Difference]: Without dead ends: 377 [2022-11-20 19:59:25,441 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:25,442 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:25,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 36 Unchecked, 0.1s Time] [2022-11-20 19:59:25,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2022-11-20 19:59:25,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2022-11-20 19:59:25,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 315 states have (on average 3.53015873015873) internal successors, (1112), 376 states have internal predecessors, (1112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:25,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 1112 transitions. [2022-11-20 19:59:25,463 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 1112 transitions. Word has length 3 [2022-11-20 19:59:25,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:25,463 INFO L495 AbstractCegarLoop]: Abstraction has 377 states and 1112 transitions. [2022-11-20 19:59:25,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:25,464 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 1112 transitions. [2022-11-20 19:59:25,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 19:59:25,464 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:25,464 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 19:59:25,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:25,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:25,677 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:25,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:25,677 INFO L85 PathProgramCache]: Analyzing trace with hash 684519, now seen corresponding path program 1 times [2022-11-20 19:59:25,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:25,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1994671752] [2022-11-20 19:59:25,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:25,678 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:25,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:25,680 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:25,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-11-20 19:59:25,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:25,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 19:59:25,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:25,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:25,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:25,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:25,976 INFO L321 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2022-11-20 19:59:25,976 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 35 [2022-11-20 19:59:26,001 INFO L321 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-11-20 19:59:26,001 INFO L350 Elim1Store]: Elim1 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 23 treesize of output 19 [2022-11-20 19:59:26,349 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:26,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:26,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:26,564 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:26,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1994671752] [2022-11-20 19:59:26,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1994671752] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:26,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1140371988] [2022-11-20 19:59:26,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:26,564 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:26,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:59:26,568 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:59:26,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2022-11-20 19:59:26,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:26,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 19:59:26,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:26,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:26,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:26,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:26,905 INFO L321 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2022-11-20 19:59:26,905 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 28 [2022-11-20 19:59:26,920 INFO L350 Elim1Store]: Elim1 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 10 treesize of output 8 [2022-11-20 19:59:27,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:27,043 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:27,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1140371988] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:27,043 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:59:27,043 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [2, 2] total 5 [2022-11-20 19:59:27,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206239399] [2022-11-20 19:59:27,044 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:27,044 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:27,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:27,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:27,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 19:59:27,045 INFO L87 Difference]: Start difference. First operand 377 states and 1112 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:27,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:27,176 INFO L93 Difference]: Finished difference Result 376 states and 1111 transitions. [2022-11-20 19:59:27,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:27,176 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-20 19:59:27,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:27,179 INFO L225 Difference]: With dead ends: 376 [2022-11-20 19:59:27,179 INFO L226 Difference]: Without dead ends: 376 [2022-11-20 19:59:27,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-20 19:59:27,181 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:27,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 35 Unchecked, 0.1s Time] [2022-11-20 19:59:27,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2022-11-20 19:59:27,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 376. [2022-11-20 19:59:27,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 315 states have (on average 3.526984126984127) internal successors, (1111), 375 states have internal predecessors, (1111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:27,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 1111 transitions. [2022-11-20 19:59:27,195 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 1111 transitions. Word has length 3 [2022-11-20 19:59:27,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:27,196 INFO L495 AbstractCegarLoop]: Abstraction has 376 states and 1111 transitions. [2022-11-20 19:59:27,196 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:27,196 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 1111 transitions. [2022-11-20 19:59:27,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 19:59:27,196 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:27,197 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 19:59:27,207 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (8)] Ended with exit code 0 [2022-11-20 19:59:27,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:27,599 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:27,600 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:27,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:27,600 INFO L85 PathProgramCache]: Analyzing trace with hash 684392, now seen corresponding path program 1 times [2022-11-20 19:59:27,601 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:27,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [964949812] [2022-11-20 19:59:27,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:27,601 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:27,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:27,602 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:27,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2022-11-20 19:59:27,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:27,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:59:27,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:27,841 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:27,841 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:27,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:27,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:28,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:28,175 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:28,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [964949812] [2022-11-20 19:59:28,175 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [964949812] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:28,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [872891940] [2022-11-20 19:59:28,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:28,175 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:28,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:59:28,176 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:59:28,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2022-11-20 19:59:28,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:28,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:59:28,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:28,474 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:28,474 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:28,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:28,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:28,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:28,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [872891940] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:28,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937396100] [2022-11-20 19:59:28,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:28,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:59:28,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:59:28,618 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:59:28,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-20 19:59:28,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:28,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 19:59:28,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:28,863 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:28,863 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:28,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:28,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:29,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:29,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937396100] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:29,075 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:59:29,076 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2, 2, 2, 2] total 6 [2022-11-20 19:59:29,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958986366] [2022-11-20 19:59:29,076 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:59:29,076 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 19:59:29,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:29,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 19:59:29,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-11-20 19:59:29,077 INFO L87 Difference]: Start difference. First operand 376 states and 1111 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:30,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:30,184 INFO L93 Difference]: Finished difference Result 751 states and 2224 transitions. [2022-11-20 19:59:30,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 19:59:30,185 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-20 19:59:30,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:30,191 INFO L225 Difference]: With dead ends: 751 [2022-11-20 19:59:30,191 INFO L226 Difference]: Without dead ends: 751 [2022-11-20 19:59:30,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2022-11-20 19:59:30,192 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 140 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:30,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 6 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-20 19:59:30,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2022-11-20 19:59:30,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 379. [2022-11-20 19:59:30,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 318 states have (on average 3.518867924528302) internal successors, (1119), 378 states have internal predecessors, (1119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:30,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 1119 transitions. [2022-11-20 19:59:30,210 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 1119 transitions. Word has length 3 [2022-11-20 19:59:30,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:30,210 INFO L495 AbstractCegarLoop]: Abstraction has 379 states and 1119 transitions. [2022-11-20 19:59:30,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:30,211 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 1119 transitions. [2022-11-20 19:59:30,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-20 19:59:30,211 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:30,212 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1] [2022-11-20 19:59:30,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:30,422 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (9)] Ended with exit code 0 [2022-11-20 19:59:30,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:30,814 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:59:30,815 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:30,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:30,816 INFO L85 PathProgramCache]: Analyzing trace with hash 21220124, now seen corresponding path program 1 times [2022-11-20 19:59:30,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:30,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2059545191] [2022-11-20 19:59:30,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:30,816 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:30,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:30,817 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:30,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-11-20 19:59:30,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:30,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 19:59:30,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:30,950 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:30,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:31,008 INFO L350 Elim1Store]: Elim1 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 25 treesize of output 21 [2022-11-20 19:59:31,151 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:31,152 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:31,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2059545191] [2022-11-20 19:59:31,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2059545191] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:31,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1328473988] [2022-11-20 19:59:31,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:31,152 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:31,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:59:31,154 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:59:31,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2022-11-20 19:59:31,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:31,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 19:59:31,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:31,458 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:31,458 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:31,573 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:31,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:32,021 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:32,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1328473988] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:32,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878088628] [2022-11-20 19:59:32,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:32,022 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:59:32,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:59:32,023 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:59:32,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-20 19:59:32,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:32,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 19:59:32,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:32,251 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:32,251 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:32,323 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 19:59:32,323 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:32,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878088628] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:32,324 INFO L184 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2022-11-20 19:59:32,324 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3, 3, 3] total 13 [2022-11-20 19:59:32,324 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524946348] [2022-11-20 19:59:32,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:32,324 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:32,325 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:32,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:32,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-11-20 19:59:32,325 INFO L87 Difference]: Start difference. First operand 379 states and 1119 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:32,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:32,489 INFO L93 Difference]: Finished difference Result 378 states and 1116 transitions. [2022-11-20 19:59:32,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:32,490 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-20 19:59:32,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:32,493 INFO L225 Difference]: With dead ends: 378 [2022-11-20 19:59:32,493 INFO L226 Difference]: Without dead ends: 378 [2022-11-20 19:59:32,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-11-20 19:59:32,494 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 35 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:32,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 2 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 19:59:32,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2022-11-20 19:59:32,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 378. [2022-11-20 19:59:32,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 318 states have (on average 3.509433962264151) internal successors, (1116), 377 states have internal predecessors, (1116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:32,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 1116 transitions. [2022-11-20 19:59:32,507 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 1116 transitions. Word has length 4 [2022-11-20 19:59:32,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:32,507 INFO L495 AbstractCegarLoop]: Abstraction has 378 states and 1116 transitions. [2022-11-20 19:59:32,508 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:32,508 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 1116 transitions. [2022-11-20 19:59:32,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-20 19:59:32,508 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:32,508 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-20 19:59:32,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:32,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:32,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:33,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:59:33,120 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:33,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:33,121 INFO L85 PathProgramCache]: Analyzing trace with hash 657833144, now seen corresponding path program 1 times [2022-11-20 19:59:33,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:33,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1065950374] [2022-11-20 19:59:33,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:33,121 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:33,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:33,123 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:33,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2022-11-20 19:59:33,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:33,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 19:59:33,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:33,356 INFO L321 Elim1Store]: treesize reduction 101, result has 20.5 percent of original size [2022-11-20 19:59:33,357 INFO L350 Elim1Store]: Elim1 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 4 case distinctions, treesize of input 29 treesize of output 44 [2022-11-20 19:59:33,387 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:33,387 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:33,388 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:33,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1065950374] [2022-11-20 19:59:33,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1065950374] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:33,388 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:33,388 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 19:59:33,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659849638] [2022-11-20 19:59:33,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:33,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:33,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:33,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:33,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:33,389 INFO L87 Difference]: Start difference. First operand 378 states and 1116 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:33,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:33,542 INFO L93 Difference]: Finished difference Result 363 states and 1081 transitions. [2022-11-20 19:59:33,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:33,543 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-20 19:59:33,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:33,545 INFO L225 Difference]: With dead ends: 363 [2022-11-20 19:59:33,545 INFO L226 Difference]: Without dead ends: 363 [2022-11-20 19:59:33,546 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 [2022-11-20 19:59:33,546 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 31 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:33,547 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 2 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 19:59:33,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2022-11-20 19:59:33,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 363. [2022-11-20 19:59:33,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 309 states have (on average 3.498381877022654) internal successors, (1081), 362 states have internal predecessors, (1081), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:33,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 1081 transitions. [2022-11-20 19:59:33,559 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 1081 transitions. Word has length 5 [2022-11-20 19:59:33,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:33,559 INFO L495 AbstractCegarLoop]: Abstraction has 363 states and 1081 transitions. [2022-11-20 19:59:33,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:33,560 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 1081 transitions. [2022-11-20 19:59:33,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-20 19:59:33,560 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:33,560 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-20 19:59:33,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:33,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:33,771 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:33,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:33,771 INFO L85 PathProgramCache]: Analyzing trace with hash 657833145, now seen corresponding path program 1 times [2022-11-20 19:59:33,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:33,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2116313490] [2022-11-20 19:59:33,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:33,771 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:33,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:33,772 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:33,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2022-11-20 19:59:33,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:33,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 19:59:33,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:33,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:33,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:34,024 INFO L321 Elim1Store]: treesize reduction 49, result has 38.8 percent of original size [2022-11-20 19:59:34,024 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 38 [2022-11-20 19:59:34,044 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 12 [2022-11-20 19:59:34,287 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:34,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:34,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:34,538 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:34,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2116313490] [2022-11-20 19:59:34,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2116313490] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:34,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1075385050] [2022-11-20 19:59:34,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:34,538 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:34,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:59:34,540 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:59:34,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2022-11-20 19:59:34,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:34,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 19:59:34,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:34,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:34,899 INFO L321 Elim1Store]: treesize reduction 59, result has 36.6 percent of original size [2022-11-20 19:59:34,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 39 [2022-11-20 19:59:34,920 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 24 [2022-11-20 19:59:35,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:35,095 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:35,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1075385050] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:35,095 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:59:35,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3, 3] total 8 [2022-11-20 19:59:35,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300472297] [2022-11-20 19:59:35,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:35,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 19:59:35,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:35,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 19:59:35,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2022-11-20 19:59:35,096 INFO L87 Difference]: Start difference. First operand 363 states and 1081 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:35,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:35,206 INFO L93 Difference]: Finished difference Result 363 states and 1084 transitions. [2022-11-20 19:59:35,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 19:59:35,206 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-20 19:59:35,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:35,209 INFO L225 Difference]: With dead ends: 363 [2022-11-20 19:59:35,209 INFO L226 Difference]: Without dead ends: 363 [2022-11-20 19:59:35,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2022-11-20 19:59:35,210 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:35,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 6 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 56 Unchecked, 0.1s Time] [2022-11-20 19:59:35,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2022-11-20 19:59:35,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 363. [2022-11-20 19:59:35,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 309 states have (on average 3.5080906148867315) internal successors, (1084), 362 states have internal predecessors, (1084), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:35,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 1084 transitions. [2022-11-20 19:59:35,223 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 1084 transitions. Word has length 5 [2022-11-20 19:59:35,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:35,224 INFO L495 AbstractCegarLoop]: Abstraction has 363 states and 1084 transitions. [2022-11-20 19:59:35,224 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:35,224 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 1084 transitions. [2022-11-20 19:59:35,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 19:59:35,225 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:35,225 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-20 19:59:35,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:35,439 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2022-11-20 19:59:35,637 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:35,637 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:35,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:35,638 INFO L85 PathProgramCache]: Analyzing trace with hash -1082014180, now seen corresponding path program 1 times [2022-11-20 19:59:35,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:35,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1217222729] [2022-11-20 19:59:35,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:35,638 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:35,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:35,639 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:35,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2022-11-20 19:59:35,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:35,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 19:59:35,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:35,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:35,743 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:35,744 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:35,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1217222729] [2022-11-20 19:59:35,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1217222729] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:35,744 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:35,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 19:59:35,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418030461] [2022-11-20 19:59:35,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:35,745 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:35,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:35,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:35,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:35,746 INFO L87 Difference]: Start difference. First operand 363 states and 1084 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:35,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:35,918 INFO L93 Difference]: Finished difference Result 246 states and 720 transitions. [2022-11-20 19:59:35,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:35,919 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 19:59:35,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:35,921 INFO L225 Difference]: With dead ends: 246 [2022-11-20 19:59:35,921 INFO L226 Difference]: Without dead ends: 246 [2022-11-20 19:59:35,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:35,922 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 27 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:35,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 2 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 19:59:35,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2022-11-20 19:59:35,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 246. [2022-11-20 19:59:35,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 219 states have (on average 3.287671232876712) internal successors, (720), 245 states have internal predecessors, (720), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:35,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 720 transitions. [2022-11-20 19:59:35,931 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 720 transitions. Word has length 6 [2022-11-20 19:59:35,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:35,931 INFO L495 AbstractCegarLoop]: Abstraction has 246 states and 720 transitions. [2022-11-20 19:59:35,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:35,931 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 720 transitions. [2022-11-20 19:59:35,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 19:59:35,931 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:35,932 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-20 19:59:35,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:36,144 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:36,144 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:36,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:36,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1082014179, now seen corresponding path program 1 times [2022-11-20 19:59:36,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:36,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1014652500] [2022-11-20 19:59:36,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:36,145 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:36,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:36,146 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:36,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2022-11-20 19:59:36,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:36,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 19:59:36,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:36,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:36,298 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:36,298 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:36,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1014652500] [2022-11-20 19:59:36,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1014652500] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:36,299 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:36,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 19:59:36,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012404498] [2022-11-20 19:59:36,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:36,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 19:59:36,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:36,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 19:59:36,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-20 19:59:36,317 INFO L87 Difference]: Start difference. First operand 246 states and 720 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:36,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:36,689 INFO L93 Difference]: Finished difference Result 380 states and 1103 transitions. [2022-11-20 19:59:36,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 19:59:36,689 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 19:59:36,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:36,692 INFO L225 Difference]: With dead ends: 380 [2022-11-20 19:59:36,692 INFO L226 Difference]: Without dead ends: 380 [2022-11-20 19:59:36,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-11-20 19:59:36,693 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 108 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:36,693 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 4 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 19:59:36,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2022-11-20 19:59:36,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 295. [2022-11-20 19:59:36,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 268 states have (on average 3.4402985074626864) internal successors, (922), 294 states have internal predecessors, (922), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:36,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 922 transitions. [2022-11-20 19:59:36,705 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 922 transitions. Word has length 6 [2022-11-20 19:59:36,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:36,706 INFO L495 AbstractCegarLoop]: Abstraction has 295 states and 922 transitions. [2022-11-20 19:59:36,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:36,706 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 922 transitions. [2022-11-20 19:59:36,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 19:59:36,707 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:36,707 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1] [2022-11-20 19:59:36,718 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:36,918 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:36,918 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:36,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:36,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1082292351, now seen corresponding path program 2 times [2022-11-20 19:59:36,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:36,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1236135041] [2022-11-20 19:59:36,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:59:36,920 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:36,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:36,921 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:36,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2022-11-20 19:59:37,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:59:37,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:59:37,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 19:59:37,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:37,162 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:37,163 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:37,331 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:37,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:38,008 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:38,008 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:38,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1236135041] [2022-11-20 19:59:38,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1236135041] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:38,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2009678341] [2022-11-20 19:59:38,008 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:59:38,008 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:38,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:59:38,010 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:59:38,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2022-11-20 19:59:38,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:59:38,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:59:38,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 19:59:38,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:38,381 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:38,382 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:38,498 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:38,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:39,471 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:39,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2009678341] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:39,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456913822] [2022-11-20 19:59:39,471 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 19:59:39,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:59:39,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:59:39,475 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:59:39,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-20 19:59:39,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 19:59:39,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 19:59:39,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 19:59:39,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:39,771 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:39,772 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:39,866 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:39,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:40,116 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:40,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456913822] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:40,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:59:40,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 15 [2022-11-20 19:59:40,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829672379] [2022-11-20 19:59:40,116 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:59:40,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-20 19:59:40,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:40,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-20 19:59:40,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=182, Unknown=0, NotChecked=0, Total=272 [2022-11-20 19:59:40,118 INFO L87 Difference]: Start difference. First operand 295 states and 922 transitions. Second operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:45,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:45,011 INFO L93 Difference]: Finished difference Result 2317 states and 7311 transitions. [2022-11-20 19:59:45,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 19:59:45,013 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 19:59:45,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:45,026 INFO L225 Difference]: With dead ends: 2317 [2022-11-20 19:59:45,027 INFO L226 Difference]: Without dead ends: 2317 [2022-11-20 19:59:45,027 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=152, Invalid=268, Unknown=0, NotChecked=0, Total=420 [2022-11-20 19:59:45,028 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 1351 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1351 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:45,028 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1351 Valid, 54 Invalid, 826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-11-20 19:59:45,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2317 states. [2022-11-20 19:59:45,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2317 to 301. [2022-11-20 19:59:45,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 274 states have (on average 3.408759124087591) internal successors, (934), 300 states have internal predecessors, (934), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:45,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 934 transitions. [2022-11-20 19:59:45,057 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 934 transitions. Word has length 6 [2022-11-20 19:59:45,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:45,057 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 934 transitions. [2022-11-20 19:59:45,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:45,058 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 934 transitions. [2022-11-20 19:59:45,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 19:59:45,058 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:45,058 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:59:45,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:45,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:45,467 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-11-20 19:59:45,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:59:45,663 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:45,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:45,663 INFO L85 PathProgramCache]: Analyzing trace with hash 817303098, now seen corresponding path program 1 times [2022-11-20 19:59:45,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:45,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1047259457] [2022-11-20 19:59:45,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:45,663 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:45,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:45,664 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:45,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2022-11-20 19:59:45,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:45,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 19:59:45,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:45,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:45,815 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:45,815 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:45,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1047259457] [2022-11-20 19:59:45,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1047259457] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:45,816 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:45,816 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 19:59:45,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304419892] [2022-11-20 19:59:45,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:45,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 19:59:45,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:45,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 19:59:45,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-20 19:59:45,818 INFO L87 Difference]: Start difference. First operand 301 states and 934 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:46,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:46,119 INFO L93 Difference]: Finished difference Result 301 states and 884 transitions. [2022-11-20 19:59:46,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 19:59:46,120 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 19:59:46,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:46,122 INFO L225 Difference]: With dead ends: 301 [2022-11-20 19:59:46,123 INFO L226 Difference]: Without dead ends: 301 [2022-11-20 19:59:46,123 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-20 19:59:46,124 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 75 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:46,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 4 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 19:59:46,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2022-11-20 19:59:46,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 301. [2022-11-20 19:59:46,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 274 states have (on average 3.2262773722627736) internal successors, (884), 300 states have internal predecessors, (884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:46,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 884 transitions. [2022-11-20 19:59:46,134 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 884 transitions. Word has length 7 [2022-11-20 19:59:46,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:46,134 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 884 transitions. [2022-11-20 19:59:46,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:46,135 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 884 transitions. [2022-11-20 19:59:46,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 19:59:46,135 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:46,136 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:59:46,147 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (23)] Ended with exit code 0 [2022-11-20 19:59:46,347 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:46,347 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:46,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:46,348 INFO L85 PathProgramCache]: Analyzing trace with hash 817303873, now seen corresponding path program 1 times [2022-11-20 19:59:46,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:46,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2061674205] [2022-11-20 19:59:46,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:46,348 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:46,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:46,349 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:46,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2022-11-20 19:59:46,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:46,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 19:59:46,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:46,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:46,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:46,601 INFO L321 Elim1Store]: treesize reduction 49, result has 38.8 percent of original size [2022-11-20 19:59:46,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 38 [2022-11-20 19:59:46,616 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 12 [2022-11-20 19:59:46,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:46,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:47,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:47,135 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:47,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2061674205] [2022-11-20 19:59:47,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2061674205] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:47,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1976319857] [2022-11-20 19:59:47,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:47,135 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:47,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:59:47,136 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:59:47,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2022-11-20 19:59:47,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:47,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 19:59:47,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:47,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:47,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:47,508 INFO L321 Elim1Store]: treesize reduction 49, result has 33.8 percent of original size [2022-11-20 19:59:47,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 35 [2022-11-20 19:59:47,523 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 38 [2022-11-20 19:59:47,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:47,667 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:47,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1976319857] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:47,668 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:59:47,668 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 19:59:47,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607434984] [2022-11-20 19:59:47,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:47,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:47,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:47,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:47,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 19:59:47,669 INFO L87 Difference]: Start difference. First operand 301 states and 884 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:47,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:47,771 INFO L93 Difference]: Finished difference Result 300 states and 880 transitions. [2022-11-20 19:59:47,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:47,771 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 19:59:47,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:47,774 INFO L225 Difference]: With dead ends: 300 [2022-11-20 19:59:47,775 INFO L226 Difference]: Without dead ends: 300 [2022-11-20 19:59:47,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 19:59:47,776 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:47,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 30 Unchecked, 0.1s Time] [2022-11-20 19:59:47,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2022-11-20 19:59:47,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 300. [2022-11-20 19:59:47,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 273 states have (on average 3.2234432234432235) internal successors, (880), 299 states have internal predecessors, (880), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:47,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 880 transitions. [2022-11-20 19:59:47,787 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 880 transitions. Word has length 7 [2022-11-20 19:59:47,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:47,788 INFO L495 AbstractCegarLoop]: Abstraction has 300 states and 880 transitions. [2022-11-20 19:59:47,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:47,788 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 880 transitions. [2022-11-20 19:59:47,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 19:59:47,789 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:47,789 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:59:47,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:48,000 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (24)] Ended with exit code 0 [2022-11-20 19:59:48,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:48,193 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:48,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:48,193 INFO L85 PathProgramCache]: Analyzing trace with hash 817303731, now seen corresponding path program 1 times [2022-11-20 19:59:48,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:48,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [103666930] [2022-11-20 19:59:48,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:48,195 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:48,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:48,197 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:48,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2022-11-20 19:59:48,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:48,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 19:59:48,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:48,453 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:48,454 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:48,609 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:48,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:49,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:49,060 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:49,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [103666930] [2022-11-20 19:59:49,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [103666930] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:49,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1312354139] [2022-11-20 19:59:49,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:49,061 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:49,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:59:49,063 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:59:49,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2022-11-20 19:59:49,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:49,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 19:59:49,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:49,457 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:49,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:49,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:49,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1312354139] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:49,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434758423] [2022-11-20 19:59:49,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:49,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:59:49,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 19:59:49,742 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 19:59:49,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-20 19:59:49,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:49,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 19:59:49,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:49,910 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:49,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:49,938 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:49,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434758423] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:49,939 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 19:59:49,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 5, 5, 5, 5] total 18 [2022-11-20 19:59:49,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451812935] [2022-11-20 19:59:49,939 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 19:59:49,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-20 19:59:49,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:49,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-20 19:59:49,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-11-20 19:59:49,940 INFO L87 Difference]: Start difference. First operand 300 states and 880 transitions. Second operand has 20 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:53,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:53,619 INFO L93 Difference]: Finished difference Result 771 states and 2329 transitions. [2022-11-20 19:59:53,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 19:59:53,621 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 19:59:53,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:53,625 INFO L225 Difference]: With dead ends: 771 [2022-11-20 19:59:53,625 INFO L226 Difference]: Without dead ends: 771 [2022-11-20 19:59:53,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=250, Invalid=806, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 19:59:53,627 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 752 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 752 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:53,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [752 Valid, 27 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-20 19:59:53,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 771 states. [2022-11-20 19:59:53,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 771 to 601. [2022-11-20 19:59:53,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 601 states, 574 states have (on average 3.426829268292683) internal successors, (1967), 600 states have internal predecessors, (1967), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:53,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 601 states to 601 states and 1967 transitions. [2022-11-20 19:59:53,650 INFO L78 Accepts]: Start accepts. Automaton has 601 states and 1967 transitions. Word has length 7 [2022-11-20 19:59:53,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:53,650 INFO L495 AbstractCegarLoop]: Abstraction has 601 states and 1967 transitions. [2022-11-20 19:59:53,650 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:53,650 INFO L276 IsEmpty]: Start isEmpty. Operand 601 states and 1967 transitions. [2022-11-20 19:59:53,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 19:59:53,651 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:53,651 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:59:53,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:53,868 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (26)] Ended with exit code 0 [2022-11-20 19:59:54,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-11-20 19:59:54,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 19:59:54,262 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:54,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:54,262 INFO L85 PathProgramCache]: Analyzing trace with hash 817473219, now seen corresponding path program 1 times [2022-11-20 19:59:54,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:54,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [164401866] [2022-11-20 19:59:54,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:54,263 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:54,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:54,264 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:54,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2022-11-20 19:59:54,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:54,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 19:59:54,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:54,500 INFO L321 Elim1Store]: treesize reduction 105, result has 17.3 percent of original size [2022-11-20 19:59:54,501 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 15 treesize of output 29 [2022-11-20 19:59:54,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:54,529 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:54,529 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:54,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [164401866] [2022-11-20 19:59:54,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [164401866] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:54,530 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:54,530 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-20 19:59:54,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100541272] [2022-11-20 19:59:54,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:54,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:54,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:54,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:54,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:54,531 INFO L87 Difference]: Start difference. First operand 601 states and 1967 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:54,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:54,678 INFO L93 Difference]: Finished difference Result 555 states and 1820 transitions. [2022-11-20 19:59:54,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:54,679 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 19:59:54,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:54,684 INFO L225 Difference]: With dead ends: 555 [2022-11-20 19:59:54,684 INFO L226 Difference]: Without dead ends: 555 [2022-11-20 19:59:54,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 19:59:54,685 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 25 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:54,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 2 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 19:59:54,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2022-11-20 19:59:54,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 555. [2022-11-20 19:59:54,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 555 states, 533 states have (on average 3.4146341463414633) internal successors, (1820), 554 states have internal predecessors, (1820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:54,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 555 states to 555 states and 1820 transitions. [2022-11-20 19:59:54,702 INFO L78 Accepts]: Start accepts. Automaton has 555 states and 1820 transitions. Word has length 7 [2022-11-20 19:59:54,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:54,703 INFO L495 AbstractCegarLoop]: Abstraction has 555 states and 1820 transitions. [2022-11-20 19:59:54,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:54,703 INFO L276 IsEmpty]: Start isEmpty. Operand 555 states and 1820 transitions. [2022-11-20 19:59:54,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 19:59:54,704 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:54,704 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:59:54,716 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:54,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:54,916 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:54,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:54,918 INFO L85 PathProgramCache]: Analyzing trace with hash 817473220, now seen corresponding path program 1 times [2022-11-20 19:59:54,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:54,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1713286682] [2022-11-20 19:59:54,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:54,919 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:54,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:54,920 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:54,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2022-11-20 19:59:55,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:55,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 19:59:55,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:55,189 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:55,189 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 19:59:55,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:55,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:55,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 19:59:55,691 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:55,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1713286682] [2022-11-20 19:59:55,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1713286682] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:55,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1020819763] [2022-11-20 19:59:55,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:55,692 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:55,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:59:55,693 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:59:55,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2022-11-20 19:59:55,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:55,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 19:59:55,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:55,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:56,029 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 19:59:56,030 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 19:59:56,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:56,128 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:56,128 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1020819763] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:56,129 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:59:56,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 19:59:56,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822136587] [2022-11-20 19:59:56,129 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:56,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:56,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:56,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:56,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 19:59:56,130 INFO L87 Difference]: Start difference. First operand 555 states and 1820 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:56,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:56,219 INFO L93 Difference]: Finished difference Result 555 states and 1828 transitions. [2022-11-20 19:59:56,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:56,220 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 19:59:56,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:56,223 INFO L225 Difference]: With dead ends: 555 [2022-11-20 19:59:56,223 INFO L226 Difference]: Without dead ends: 555 [2022-11-20 19:59:56,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 19:59:56,224 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 2 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:56,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 4 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 28 Unchecked, 0.1s Time] [2022-11-20 19:59:56,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2022-11-20 19:59:56,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 555. [2022-11-20 19:59:56,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 555 states, 533 states have (on average 3.4296435272045027) internal successors, (1828), 554 states have internal predecessors, (1828), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:56,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 555 states to 555 states and 1828 transitions. [2022-11-20 19:59:56,240 INFO L78 Accepts]: Start accepts. Automaton has 555 states and 1828 transitions. Word has length 7 [2022-11-20 19:59:56,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:56,240 INFO L495 AbstractCegarLoop]: Abstraction has 555 states and 1828 transitions. [2022-11-20 19:59:56,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:56,240 INFO L276 IsEmpty]: Start isEmpty. Operand 555 states and 1828 transitions. [2022-11-20 19:59:56,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 19:59:56,241 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:56,241 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:59:56,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:56,451 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (30)] Ended with exit code 0 [2022-11-20 19:59:56,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:56,644 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:56,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:56,645 INFO L85 PathProgramCache]: Analyzing trace with hash -433383836, now seen corresponding path program 1 times [2022-11-20 19:59:56,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:56,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1062409082] [2022-11-20 19:59:56,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:56,645 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:56,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:56,646 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:56,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2022-11-20 19:59:56,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:56,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 19:59:56,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:56,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:56,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:56,900 INFO L321 Elim1Store]: treesize reduction 49, result has 38.8 percent of original size [2022-11-20 19:59:56,900 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 38 [2022-11-20 19:59:56,917 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 12 [2022-11-20 19:59:57,314 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:57,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 19:59:57,714 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:57,714 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:57,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1062409082] [2022-11-20 19:59:57,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1062409082] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 19:59:57,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2065991697] [2022-11-20 19:59:57,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:57,715 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 19:59:57,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 19:59:57,719 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 19:59:57,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2022-11-20 19:59:57,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:57,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-20 19:59:57,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:58,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:58,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 19:59:58,104 INFO L321 Elim1Store]: treesize reduction 49, result has 33.8 percent of original size [2022-11-20 19:59:58,105 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 35 [2022-11-20 19:59:58,119 INFO L350 Elim1Store]: Elim1 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 42 treesize of output 38 [2022-11-20 19:59:58,256 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 19:59:58,256 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:58,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2065991697] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:58,256 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 19:59:58,256 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [5, 5] total 11 [2022-11-20 19:59:58,256 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090764109] [2022-11-20 19:59:58,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:58,257 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 19:59:58,257 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:58,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 19:59:58,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 19:59:58,258 INFO L87 Difference]: Start difference. First operand 555 states and 1828 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:58,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:58,353 INFO L93 Difference]: Finished difference Result 554 states and 1827 transitions. [2022-11-20 19:59:58,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 19:59:58,354 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-20 19:59:58,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:58,357 INFO L225 Difference]: With dead ends: 554 [2022-11-20 19:59:58,357 INFO L226 Difference]: Without dead ends: 554 [2022-11-20 19:59:58,357 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 19:59:58,358 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:58,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 28 Unchecked, 0.1s Time] [2022-11-20 19:59:58,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2022-11-20 19:59:58,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 554. [2022-11-20 19:59:58,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 554 states, 533 states have (on average 3.427767354596623) internal successors, (1827), 553 states have internal predecessors, (1827), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:58,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 554 states to 554 states and 1827 transitions. [2022-11-20 19:59:58,374 INFO L78 Accepts]: Start accepts. Automaton has 554 states and 1827 transitions. Word has length 8 [2022-11-20 19:59:58,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:58,374 INFO L495 AbstractCegarLoop]: Abstraction has 554 states and 1827 transitions. [2022-11-20 19:59:58,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:58,375 INFO L276 IsEmpty]: Start isEmpty. Operand 554 states and 1827 transitions. [2022-11-20 19:59:58,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-20 19:59:58,375 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:58,375 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:59:58,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:58,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (32)] Ended with exit code 0 [2022-11-20 19:59:58,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:58,779 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:58,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:58,780 INFO L85 PathProgramCache]: Analyzing trace with hash -428138500, now seen corresponding path program 1 times [2022-11-20 19:59:58,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:58,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1242412059] [2022-11-20 19:59:58,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:58,780 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:58,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:58,781 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:58,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2022-11-20 19:59:58,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:58,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 19:59:58,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:58,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 19:59:58,978 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 19:59:58,978 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 19:59:58,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1242412059] [2022-11-20 19:59:58,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1242412059] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 19:59:58,978 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 19:59:58,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 19:59:58,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30577728] [2022-11-20 19:59:58,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 19:59:58,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 19:59:58,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 19:59:58,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 19:59:58,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-20 19:59:58,980 INFO L87 Difference]: Start difference. First operand 554 states and 1827 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:59,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 19:59:59,317 INFO L93 Difference]: Finished difference Result 808 states and 2668 transitions. [2022-11-20 19:59:59,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 19:59:59,318 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-20 19:59:59,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 19:59:59,323 INFO L225 Difference]: With dead ends: 808 [2022-11-20 19:59:59,324 INFO L226 Difference]: Without dead ends: 808 [2022-11-20 19:59:59,324 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-11-20 19:59:59,325 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 81 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 19:59:59,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 4 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 19:59:59,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 808 states. [2022-11-20 19:59:59,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 808 to 673. [2022-11-20 19:59:59,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 673 states, 652 states have (on average 3.605828220858896) internal successors, (2351), 672 states have internal predecessors, (2351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:59,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 673 states to 673 states and 2351 transitions. [2022-11-20 19:59:59,365 INFO L78 Accepts]: Start accepts. Automaton has 673 states and 2351 transitions. Word has length 8 [2022-11-20 19:59:59,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 19:59:59,366 INFO L495 AbstractCegarLoop]: Abstraction has 673 states and 2351 transitions. [2022-11-20 19:59:59,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 19:59:59,366 INFO L276 IsEmpty]: Start isEmpty. Operand 673 states and 2351 transitions. [2022-11-20 19:59:59,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 19:59:59,367 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 19:59:59,367 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 19:59:59,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2022-11-20 19:59:59,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:59,578 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 19:59:59,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 19:59:59,579 INFO L85 PathProgramCache]: Analyzing trace with hash -550203958, now seen corresponding path program 1 times [2022-11-20 19:59:59,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 19:59:59,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [50935474] [2022-11-20 19:59:59,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 19:59:59,579 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 19:59:59,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 19:59:59,580 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 19:59:59,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2022-11-20 19:59:59,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 19:59:59,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 19:59:59,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 19:59:59,894 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 19:59:59,895 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:00:00,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:00,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:00,428 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:00,428 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:00,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [50935474] [2022-11-20 20:00:00,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [50935474] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:00,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [919250399] [2022-11-20 20:00:00,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:00,429 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:00,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:00:00,430 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:00:00,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2022-11-20 20:00:00,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:00,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:00:00,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:00,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:00:00,858 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 20:00:00,858 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 20:00:01,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:01,010 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:00:01,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [919250399] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:00:01,010 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:00:01,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 20:00:01,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386634583] [2022-11-20 20:00:01,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:00:01,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:00:01,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:01,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:00:01,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:00:01,012 INFO L87 Difference]: Start difference. First operand 673 states and 2351 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:01,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:01,088 INFO L93 Difference]: Finished difference Result 663 states and 2306 transitions. [2022-11-20 20:00:01,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:00:01,088 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:00:01,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:01,093 INFO L225 Difference]: With dead ends: 663 [2022-11-20 20:00:01,093 INFO L226 Difference]: Without dead ends: 663 [2022-11-20 20:00:01,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:00:01,094 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:01,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 4 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 28 Unchecked, 0.1s Time] [2022-11-20 20:00:01,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 663 states. [2022-11-20 20:00:01,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 663 to 663. [2022-11-20 20:00:01,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 663 states, 642 states have (on average 3.5919003115264796) internal successors, (2306), 662 states have internal predecessors, (2306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:01,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 663 states to 663 states and 2306 transitions. [2022-11-20 20:00:01,114 INFO L78 Accepts]: Start accepts. Automaton has 663 states and 2306 transitions. Word has length 9 [2022-11-20 20:00:01,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:01,115 INFO L495 AbstractCegarLoop]: Abstraction has 663 states and 2306 transitions. [2022-11-20 20:00:01,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:01,115 INFO L276 IsEmpty]: Start isEmpty. Operand 663 states and 2306 transitions. [2022-11-20 20:00:01,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:00:01,115 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:01,116 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:01,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:01,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (35)] Ended with exit code 0 [2022-11-20 20:00:01,519 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:01,520 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:01,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:01,520 INFO L85 PathProgramCache]: Analyzing trace with hash -387388238, now seen corresponding path program 1 times [2022-11-20 20:00:01,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:01,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1425846161] [2022-11-20 20:00:01,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:01,520 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:01,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:01,521 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:01,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2022-11-20 20:00:01,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:01,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-20 20:00:01,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:01,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:01,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:01,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:01,782 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:01,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1425846161] [2022-11-20 20:00:01,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1425846161] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-20 20:00:01,782 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:00:01,782 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2022-11-20 20:00:01,782 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747964167] [2022-11-20 20:00:01,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:00:01,783 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:00:01,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:01,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:00:01,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-20 20:00:01,783 INFO L87 Difference]: Start difference. First operand 663 states and 2306 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:02,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:02,082 INFO L93 Difference]: Finished difference Result 663 states and 2188 transitions. [2022-11-20 20:00:02,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:00:02,083 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:00:02,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:02,087 INFO L225 Difference]: With dead ends: 663 [2022-11-20 20:00:02,088 INFO L226 Difference]: Without dead ends: 663 [2022-11-20 20:00:02,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:00:02,089 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:02,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 4 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:00:02,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 663 states. [2022-11-20 20:00:02,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 663 to 663. [2022-11-20 20:00:02,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 663 states, 642 states have (on average 3.4080996884735204) internal successors, (2188), 662 states have internal predecessors, (2188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:02,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 663 states to 663 states and 2188 transitions. [2022-11-20 20:00:02,120 INFO L78 Accepts]: Start accepts. Automaton has 663 states and 2188 transitions. Word has length 9 [2022-11-20 20:00:02,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:02,121 INFO L495 AbstractCegarLoop]: Abstraction has 663 states and 2188 transitions. [2022-11-20 20:00:02,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:02,121 INFO L276 IsEmpty]: Start isEmpty. Operand 663 states and 2188 transitions. [2022-11-20 20:00:02,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:00:02,124 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:02,124 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:02,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:02,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:02,337 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:02,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:02,337 INFO L85 PathProgramCache]: Analyzing trace with hash -387387463, now seen corresponding path program 1 times [2022-11-20 20:00:02,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:02,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [7612238] [2022-11-20 20:00:02,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:02,338 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:02,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:02,339 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:02,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2022-11-20 20:00:02,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:02,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:00:02,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:02,641 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:00:02,641 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:00:02,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:02,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:03,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:03,217 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:03,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [7612238] [2022-11-20 20:00:03,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [7612238] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:03,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1339534272] [2022-11-20 20:00:03,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:03,218 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:03,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:00:03,221 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:00:03,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2022-11-20 20:00:03,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:03,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:00:03,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:03,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:00:03,662 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 20:00:03,663 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 20:00:03,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:03,801 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:00:03,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1339534272] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:00:03,801 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:00:03,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 20:00:03,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693579699] [2022-11-20 20:00:03,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:00:03,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:00:03,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:03,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:00:03,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:00:03,803 INFO L87 Difference]: Start difference. First operand 663 states and 2188 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:03,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:03,893 INFO L93 Difference]: Finished difference Result 659 states and 2168 transitions. [2022-11-20 20:00:03,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:00:03,894 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:00:03,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:03,898 INFO L225 Difference]: With dead ends: 659 [2022-11-20 20:00:03,898 INFO L226 Difference]: Without dead ends: 659 [2022-11-20 20:00:03,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:00:03,899 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:03,900 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 4 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 28 Unchecked, 0.1s Time] [2022-11-20 20:00:03,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 659 states. [2022-11-20 20:00:03,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 659 to 659. [2022-11-20 20:00:03,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 659 states, 638 states have (on average 3.3981191222570533) internal successors, (2168), 658 states have internal predecessors, (2168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:03,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 659 states to 659 states and 2168 transitions. [2022-11-20 20:00:03,920 INFO L78 Accepts]: Start accepts. Automaton has 659 states and 2168 transitions. Word has length 9 [2022-11-20 20:00:03,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:03,921 INFO L495 AbstractCegarLoop]: Abstraction has 659 states and 2168 transitions. [2022-11-20 20:00:03,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:03,921 INFO L276 IsEmpty]: Start isEmpty. Operand 659 states and 2168 transitions. [2022-11-20 20:00:03,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:00:03,922 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:03,922 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:03,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:04,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:04,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:04,328 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:04,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:04,328 INFO L85 PathProgramCache]: Analyzing trace with hash -387387569, now seen corresponding path program 1 times [2022-11-20 20:00:04,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:04,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1803901346] [2022-11-20 20:00:04,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:04,329 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:04,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:04,330 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:04,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2022-11-20 20:00:04,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:04,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:00:04,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:04,593 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:00:04,593 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:00:04,810 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:04,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:05,321 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:05,321 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:05,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1803901346] [2022-11-20 20:00:05,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1803901346] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:05,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [904669293] [2022-11-20 20:00:05,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:05,321 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:05,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:00:05,322 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:00:05,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2022-11-20 20:00:05,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:05,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:00:05,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:05,766 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:05,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:06,056 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:06,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [904669293] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:06,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625014623] [2022-11-20 20:00:06,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:06,056 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:00:06,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:00:06,059 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:00:06,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-20 20:00:06,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:06,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-20 20:00:06,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:06,304 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:06,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:06,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:06,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625014623] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:06,335 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:00:06,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 5, 5, 5, 5] total 18 [2022-11-20 20:00:06,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350516352] [2022-11-20 20:00:06,335 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:00:06,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-20 20:00:06,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:06,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-20 20:00:06,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-11-20 20:00:06,336 INFO L87 Difference]: Start difference. First operand 659 states and 2168 transitions. Second operand has 20 states, 19 states have (on average 1.894736842105263) internal successors, (36), 19 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:10,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:10,078 INFO L93 Difference]: Finished difference Result 1082 states and 3673 transitions. [2022-11-20 20:00:10,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 20:00:10,079 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.894736842105263) internal successors, (36), 19 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:00:10,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:10,086 INFO L225 Difference]: With dead ends: 1082 [2022-11-20 20:00:10,086 INFO L226 Difference]: Without dead ends: 1082 [2022-11-20 20:00:10,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=250, Invalid=806, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 20:00:10,088 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 663 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 663 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:10,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [663 Valid, 29 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-20 20:00:10,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1082 states. [2022-11-20 20:00:10,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1082 to 955. [2022-11-20 20:00:10,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 955 states, 934 states have (on average 3.6349036402569594) internal successors, (3395), 954 states have internal predecessors, (3395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:10,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 955 states to 955 states and 3395 transitions. [2022-11-20 20:00:10,118 INFO L78 Accepts]: Start accepts. Automaton has 955 states and 3395 transitions. Word has length 9 [2022-11-20 20:00:10,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:10,119 INFO L495 AbstractCegarLoop]: Abstraction has 955 states and 3395 transitions. [2022-11-20 20:00:10,119 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.894736842105263) internal successors, (36), 19 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:10,119 INFO L276 IsEmpty]: Start isEmpty. Operand 955 states and 3395 transitions. [2022-11-20 20:00:10,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:00:10,120 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:10,120 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:10,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:10,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:10,535 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (40)] Ended with exit code 0 [2022-11-20 20:00:10,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:10,728 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:10,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:10,728 INFO L85 PathProgramCache]: Analyzing trace with hash -387234563, now seen corresponding path program 1 times [2022-11-20 20:00:10,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:10,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1525980261] [2022-11-20 20:00:10,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:10,729 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:10,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:10,730 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:10,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2022-11-20 20:00:10,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:10,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 20:00:10,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:10,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:10,940 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:00:10,940 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:10,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1525980261] [2022-11-20 20:00:10,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1525980261] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:00:10,941 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:00:10,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:00:10,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716971210] [2022-11-20 20:00:10,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:00:10,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:00:10,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:10,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:00:10,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:00:10,942 INFO L87 Difference]: Start difference. First operand 955 states and 3395 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:11,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:11,089 INFO L93 Difference]: Finished difference Result 797 states and 2758 transitions. [2022-11-20 20:00:11,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:00:11,089 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:00:11,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:11,094 INFO L225 Difference]: With dead ends: 797 [2022-11-20 20:00:11,094 INFO L226 Difference]: Without dead ends: 797 [2022-11-20 20:00:11,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:00:11,095 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 29 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:11,095 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 2 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:00:11,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 797 states. [2022-11-20 20:00:11,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 797 to 797. [2022-11-20 20:00:11,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 797 states, 780 states have (on average 3.5358974358974358) internal successors, (2758), 796 states have internal predecessors, (2758), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:11,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 797 states to 797 states and 2758 transitions. [2022-11-20 20:00:11,125 INFO L78 Accepts]: Start accepts. Automaton has 797 states and 2758 transitions. Word has length 9 [2022-11-20 20:00:11,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:11,126 INFO L495 AbstractCegarLoop]: Abstraction has 797 states and 2758 transitions. [2022-11-20 20:00:11,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:11,126 INFO L276 IsEmpty]: Start isEmpty. Operand 797 states and 2758 transitions. [2022-11-20 20:00:11,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-20 20:00:11,127 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:11,127 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:11,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:11,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:11,339 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:11,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:11,339 INFO L85 PathProgramCache]: Analyzing trace with hash -387234564, now seen corresponding path program 1 times [2022-11-20 20:00:11,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:11,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [965324403] [2022-11-20 20:00:11,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:11,339 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:11,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:11,340 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:11,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2022-11-20 20:00:11,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:11,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 20:00:11,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:11,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:11,489 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:00:11,489 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:11,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [965324403] [2022-11-20 20:00:11,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [965324403] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:00:11,490 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:00:11,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:00:11,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118367835] [2022-11-20 20:00:11,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:00:11,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:00:11,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:11,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:00:11,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:00:11,491 INFO L87 Difference]: Start difference. First operand 797 states and 2758 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:11,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:11,611 INFO L93 Difference]: Finished difference Result 639 states and 2121 transitions. [2022-11-20 20:00:11,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:00:11,611 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-20 20:00:11,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:11,614 INFO L225 Difference]: With dead ends: 639 [2022-11-20 20:00:11,614 INFO L226 Difference]: Without dead ends: 639 [2022-11-20 20:00:11,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 20:00:11,615 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 22 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:11,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 2 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:00:11,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2022-11-20 20:00:11,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 639. [2022-11-20 20:00:11,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 639 states, 626 states have (on average 3.3881789137380194) internal successors, (2121), 638 states have internal predecessors, (2121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:11,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 639 states to 639 states and 2121 transitions. [2022-11-20 20:00:11,630 INFO L78 Accepts]: Start accepts. Automaton has 639 states and 2121 transitions. Word has length 9 [2022-11-20 20:00:11,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:11,631 INFO L495 AbstractCegarLoop]: Abstraction has 639 states and 2121 transitions. [2022-11-20 20:00:11,631 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:11,631 INFO L276 IsEmpty]: Start isEmpty. Operand 639 states and 2121 transitions. [2022-11-20 20:00:11,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:00:11,632 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:11,632 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:11,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:11,843 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:11,844 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:11,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:11,844 INFO L85 PathProgramCache]: Analyzing trace with hash 123546543, now seen corresponding path program 1 times [2022-11-20 20:00:11,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:11,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1584194051] [2022-11-20 20:00:11,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:11,845 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:11,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:11,846 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:11,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2022-11-20 20:00:12,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:12,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 20:00:12,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:12,145 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:00:12,145 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:00:12,547 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:12,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:13,056 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:13,056 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:13,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1584194051] [2022-11-20 20:00:13,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1584194051] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:13,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1473211750] [2022-11-20 20:00:13,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:13,057 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:13,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:00:13,063 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:00:13,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2022-11-20 20:00:13,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:13,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:00:13,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:13,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:00:13,497 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 20:00:13,497 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 20:00:13,633 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:00:13,634 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:00:13,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1473211750] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:00:13,634 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:00:13,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [5, 5] total 11 [2022-11-20 20:00:13,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031805519] [2022-11-20 20:00:13,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:00:13,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:00:13,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:13,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:00:13,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:00:13,635 INFO L87 Difference]: Start difference. First operand 639 states and 2121 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:13,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:13,702 INFO L93 Difference]: Finished difference Result 635 states and 2113 transitions. [2022-11-20 20:00:13,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:00:13,702 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 20:00:13,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:13,705 INFO L225 Difference]: With dead ends: 635 [2022-11-20 20:00:13,705 INFO L226 Difference]: Without dead ends: 635 [2022-11-20 20:00:13,705 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:00:13,706 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:13,706 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 4 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 26 Unchecked, 0.1s Time] [2022-11-20 20:00:13,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 635 states. [2022-11-20 20:00:13,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 635 to 635. [2022-11-20 20:00:13,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 635 states, 622 states have (on average 3.397106109324759) internal successors, (2113), 634 states have internal predecessors, (2113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:13,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 635 states to 635 states and 2113 transitions. [2022-11-20 20:00:13,723 INFO L78 Accepts]: Start accepts. Automaton has 635 states and 2113 transitions. Word has length 10 [2022-11-20 20:00:13,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:13,724 INFO L495 AbstractCegarLoop]: Abstraction has 635 states and 2113 transitions. [2022-11-20 20:00:13,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:13,724 INFO L276 IsEmpty]: Start isEmpty. Operand 635 states and 2113 transitions. [2022-11-20 20:00:13,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-20 20:00:13,724 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:13,725 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:13,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:13,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:14,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:14,138 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:14,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:14,138 INFO L85 PathProgramCache]: Analyzing trace with hash 875890623, now seen corresponding path program 1 times [2022-11-20 20:00:14,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:14,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2045056613] [2022-11-20 20:00:14,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:14,139 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:14,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:14,140 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:14,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2022-11-20 20:00:14,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:14,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 20:00:14,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:14,474 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:00:14,475 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:00:14,896 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:14,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:15,438 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:15,438 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:15,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2045056613] [2022-11-20 20:00:15,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2045056613] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:15,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [531031959] [2022-11-20 20:00:15,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:15,439 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:15,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:00:15,439 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:00:15,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2022-11-20 20:00:15,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:15,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:00:15,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:15,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:00:15,948 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 20:00:15,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 20:00:16,099 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:00:16,099 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:00:16,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [531031959] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:00:16,099 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:00:16,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [5, 5] total 11 [2022-11-20 20:00:16,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231556185] [2022-11-20 20:00:16,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:00:16,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:00:16,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:16,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:00:16,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:00:16,101 INFO L87 Difference]: Start difference. First operand 635 states and 2113 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:16,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:16,177 INFO L93 Difference]: Finished difference Result 631 states and 2105 transitions. [2022-11-20 20:00:16,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:00:16,177 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-20 20:00:16,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:16,179 INFO L225 Difference]: With dead ends: 631 [2022-11-20 20:00:16,179 INFO L226 Difference]: Without dead ends: 631 [2022-11-20 20:00:16,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:00:16,180 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:16,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 4 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 26 Unchecked, 0.1s Time] [2022-11-20 20:00:16,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2022-11-20 20:00:16,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 631. [2022-11-20 20:00:16,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 631 states, 618 states have (on average 3.4061488673139158) internal successors, (2105), 630 states have internal predecessors, (2105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:16,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 631 states to 631 states and 2105 transitions. [2022-11-20 20:00:16,195 INFO L78 Accepts]: Start accepts. Automaton has 631 states and 2105 transitions. Word has length 10 [2022-11-20 20:00:16,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:16,195 INFO L495 AbstractCegarLoop]: Abstraction has 631 states and 2105 transitions. [2022-11-20 20:00:16,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:16,195 INFO L276 IsEmpty]: Start isEmpty. Operand 631 states and 2105 transitions. [2022-11-20 20:00:16,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:00:16,196 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:16,196 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:16,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:16,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:16,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:16,611 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:16,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:16,611 INFO L85 PathProgramCache]: Analyzing trace with hash -470064045, now seen corresponding path program 1 times [2022-11-20 20:00:16,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:16,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [461557745] [2022-11-20 20:00:16,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:16,611 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:16,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:16,612 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:16,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2022-11-20 20:00:16,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:16,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:00:16,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:16,943 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:00:16,944 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:00:17,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:17,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:17,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:17,487 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:17,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [461557745] [2022-11-20 20:00:17,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [461557745] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:17,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [39729282] [2022-11-20 20:00:17,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:17,487 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:17,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:00:17,490 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:00:17,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2022-11-20 20:00:17,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:17,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:00:17,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:17,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:00:17,959 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 20:00:17,959 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 20:00:18,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:18,123 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:00:18,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [39729282] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:00:18,124 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:00:18,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 20:00:18,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563322309] [2022-11-20 20:00:18,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:00:18,124 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:00:18,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:18,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:00:18,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:00:18,125 INFO L87 Difference]: Start difference. First operand 631 states and 2105 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:18,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:18,192 INFO L93 Difference]: Finished difference Result 614 states and 2014 transitions. [2022-11-20 20:00:18,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:00:18,193 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:00:18,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:18,195 INFO L225 Difference]: With dead ends: 614 [2022-11-20 20:00:18,196 INFO L226 Difference]: Without dead ends: 614 [2022-11-20 20:00:18,196 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:00:18,196 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:18,197 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 26 Unchecked, 0.1s Time] [2022-11-20 20:00:18,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2022-11-20 20:00:18,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 614. [2022-11-20 20:00:18,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 614 states, 601 states have (on average 3.35108153078203) internal successors, (2014), 613 states have internal predecessors, (2014), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:18,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 614 states to 614 states and 2014 transitions. [2022-11-20 20:00:18,213 INFO L78 Accepts]: Start accepts. Automaton has 614 states and 2014 transitions. Word has length 11 [2022-11-20 20:00:18,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:18,214 INFO L495 AbstractCegarLoop]: Abstraction has 614 states and 2014 transitions. [2022-11-20 20:00:18,214 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:18,214 INFO L276 IsEmpty]: Start isEmpty. Operand 614 states and 2014 transitions. [2022-11-20 20:00:18,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-20 20:00:18,215 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:18,215 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1] [2022-11-20 20:00:18,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (50)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:18,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:18,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:18,620 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:18,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:18,620 INFO L85 PathProgramCache]: Analyzing trace with hash 1311653956, now seen corresponding path program 2 times [2022-11-20 20:00:18,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:18,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [883156795] [2022-11-20 20:00:18,620 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:00:18,621 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:18,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:18,621 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:18,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2022-11-20 20:00:18,793 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:00:18,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:00:18,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:00:18,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:18,934 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:00:18,934 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:00:19,304 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:19,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:20,981 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:00:20,981 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:20,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [883156795] [2022-11-20 20:00:20,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [883156795] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:20,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1303839930] [2022-11-20 20:00:20,982 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:00:20,982 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:20,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:00:20,983 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:00:20,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2022-11-20 20:00:21,329 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:00:21,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:00:21,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:00:21,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:22,120 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:22,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:23,116 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:23,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1303839930] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:23,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092648194] [2022-11-20 20:00:23,117 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:00:23,117 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:00:23,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:00:23,118 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:00:23,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-20 20:00:23,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:00:23,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:00:23,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:00:23,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:23,621 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:23,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:23,910 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:23,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092648194] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:23,910 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:00:23,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 34 [2022-11-20 20:00:23,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255545991] [2022-11-20 20:00:23,911 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:00:23,911 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 20:00:23,911 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:23,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 20:00:23,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1049, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 20:00:23,912 INFO L87 Difference]: Start difference. First operand 614 states and 2014 transitions. Second operand has 35 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 34 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:56,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:56,316 INFO L93 Difference]: Finished difference Result 2517 states and 8106 transitions. [2022-11-20 20:00:56,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-20 20:00:56,318 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 34 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-20 20:00:56,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:56,325 INFO L225 Difference]: With dead ends: 2517 [2022-11-20 20:00:56,326 INFO L226 Difference]: Without dead ends: 2517 [2022-11-20 20:00:56,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1075 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=666, Invalid=4026, Unknown=0, NotChecked=0, Total=4692 [2022-11-20 20:00:56,328 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 794 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 3249 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 794 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 3582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 3249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 307 IncrementalHoareTripleChecker+Unchecked, 17.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:56,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [794 Valid, 269 Invalid, 3582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 3249 Invalid, 0 Unknown, 307 Unchecked, 17.5s Time] [2022-11-20 20:00:56,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2517 states. [2022-11-20 20:00:56,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2517 to 724. [2022-11-20 20:00:56,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 724 states, 711 states have (on average 3.39943741209564) internal successors, (2417), 723 states have internal predecessors, (2417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:56,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 724 states to 724 states and 2417 transitions. [2022-11-20 20:00:56,360 INFO L78 Accepts]: Start accepts. Automaton has 724 states and 2417 transitions. Word has length 11 [2022-11-20 20:00:56,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:56,361 INFO L495 AbstractCegarLoop]: Abstraction has 724 states and 2417 transitions. [2022-11-20 20:00:56,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 34 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:56,361 INFO L276 IsEmpty]: Start isEmpty. Operand 724 states and 2417 transitions. [2022-11-20 20:00:56,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:00:56,362 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:56,362 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:56,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:56,575 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (51)] Ended with exit code 0 [2022-11-20 20:00:56,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-11-20 20:00:56,967 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:00:56,967 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:56,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:56,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1687107630, now seen corresponding path program 1 times [2022-11-20 20:00:56,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:56,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1716603938] [2022-11-20 20:00:56,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:56,968 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:56,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:56,969 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:56,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2022-11-20 20:00:57,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:57,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 20:00:57,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:57,308 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:00:57,308 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:00:57,757 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:57,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:00:58,292 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:00:58,292 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:00:58,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1716603938] [2022-11-20 20:00:58,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1716603938] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:00:58,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1597841289] [2022-11-20 20:00:58,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:58,293 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:58,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:00:58,297 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:00:58,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2022-11-20 20:00:58,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:58,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:00:58,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:58,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:00:58,774 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 20:00:58,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 20:00:58,938 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:00:58,938 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:00:58,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1597841289] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:00:58,938 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:00:58,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [5, 5] total 11 [2022-11-20 20:00:58,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811121542] [2022-11-20 20:00:58,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:00:58,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:00:58,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:00:58,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:00:58,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:00:58,940 INFO L87 Difference]: Start difference. First operand 724 states and 2417 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:58,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:00:58,998 INFO L93 Difference]: Finished difference Result 719 states and 2402 transitions. [2022-11-20 20:00:58,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:00:58,998 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:00:58,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:00:59,001 INFO L225 Difference]: With dead ends: 719 [2022-11-20 20:00:59,001 INFO L226 Difference]: Without dead ends: 719 [2022-11-20 20:00:59,001 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:00:59,002 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:00:59,002 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 26 Unchecked, 0.1s Time] [2022-11-20 20:00:59,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 719 states. [2022-11-20 20:00:59,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 719 to 719. [2022-11-20 20:00:59,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 719 states, 706 states have (on average 3.4022662889518416) internal successors, (2402), 718 states have internal predecessors, (2402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:59,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 719 states to 719 states and 2402 transitions. [2022-11-20 20:00:59,013 INFO L78 Accepts]: Start accepts. Automaton has 719 states and 2402 transitions. Word has length 12 [2022-11-20 20:00:59,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:00:59,013 INFO L495 AbstractCegarLoop]: Abstraction has 719 states and 2402 transitions. [2022-11-20 20:00:59,013 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:00:59,013 INFO L276 IsEmpty]: Start isEmpty. Operand 719 states and 2402 transitions. [2022-11-20 20:00:59,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:00:59,014 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:00:59,014 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:00:59,026 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (54)] Ended with exit code 0 [2022-11-20 20:00:59,221 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (55)] Ended with exit code 0 [2022-11-20 20:00:59,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:00:59,419 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:00:59,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:00:59,419 INFO L85 PathProgramCache]: Analyzing trace with hash -1687083419, now seen corresponding path program 1 times [2022-11-20 20:00:59,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:00:59,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [197912900] [2022-11-20 20:00:59,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:00:59,420 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:00:59,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:00:59,421 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:00:59,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2022-11-20 20:00:59,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:00:59,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:00:59,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:00:59,772 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:00:59,773 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:01:00,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:00,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:01:00,357 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:00,357 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:01:00,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [197912900] [2022-11-20 20:01:00,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [197912900] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:01:00,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1640804660] [2022-11-20 20:01:00,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:01:00,358 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:01:00,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:01:00,359 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:01:00,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2022-11-20 20:01:00,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:01:00,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:01:00,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:01:00,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:01:00,870 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 20:01:00,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 20:01:01,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:01:01,058 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:01:01,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1640804660] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:01:01,058 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:01:01,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [3, 3] total 7 [2022-11-20 20:01:01,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161713615] [2022-11-20 20:01:01,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:01:01,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:01:01,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:01:01,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:01:01,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:01:01,060 INFO L87 Difference]: Start difference. First operand 719 states and 2402 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:01:01,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:01:01,119 INFO L93 Difference]: Finished difference Result 713 states and 2384 transitions. [2022-11-20 20:01:01,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:01:01,120 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:01:01,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:01:01,123 INFO L225 Difference]: With dead ends: 713 [2022-11-20 20:01:01,123 INFO L226 Difference]: Without dead ends: 713 [2022-11-20 20:01:01,123 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:01:01,124 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:01:01,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 26 Unchecked, 0.1s Time] [2022-11-20 20:01:01,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 713 states. [2022-11-20 20:01:01,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 713 to 713. [2022-11-20 20:01:01,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 713 states, 700 states have (on average 3.4057142857142857) internal successors, (2384), 712 states have internal predecessors, (2384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:01:01,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 713 states to 713 states and 2384 transitions. [2022-11-20 20:01:01,138 INFO L78 Accepts]: Start accepts. Automaton has 713 states and 2384 transitions. Word has length 12 [2022-11-20 20:01:01,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:01:01,138 INFO L495 AbstractCegarLoop]: Abstraction has 713 states and 2384 transitions. [2022-11-20 20:01:01,138 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:01:01,138 INFO L276 IsEmpty]: Start isEmpty. Operand 713 states and 2384 transitions. [2022-11-20 20:01:01,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:01:01,139 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:01:01,139 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2022-11-20 20:01:01,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2022-11-20 20:01:01,349 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (56)] Ended with exit code 0 [2022-11-20 20:01:01,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:01:01,541 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:01:01,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:01:01,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1920684431, now seen corresponding path program 1 times [2022-11-20 20:01:01,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:01:01,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [674363245] [2022-11-20 20:01:01,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:01:01,542 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:01:01,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:01:01,543 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:01:01,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2022-11-20 20:01:01,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:01:01,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:01:01,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:01:01,873 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:01:01,873 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:01:02,275 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:01:02,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:01:04,105 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:01:04,105 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:01:04,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [674363245] [2022-11-20 20:01:04,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [674363245] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:01:04,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [778322708] [2022-11-20 20:01:04,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:01:04,106 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:01:04,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:01:04,107 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:01:04,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2022-11-20 20:01:04,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:01:04,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:01:04,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:01:05,182 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:05,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:01:06,207 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:06,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [778322708] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:01:06,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196322183] [2022-11-20 20:01:06,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:01:06,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:01:06,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:01:06,209 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:01:06,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-11-20 20:01:06,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:01:06,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:01:06,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:01:06,837 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:06,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:01:06,913 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:06,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196322183] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:01:06,913 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:01:06,913 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 35 [2022-11-20 20:01:06,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143225246] [2022-11-20 20:01:06,914 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:01:06,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-20 20:01:06,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:01:06,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-20 20:01:06,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1118, Unknown=0, NotChecked=0, Total=1260 [2022-11-20 20:01:06,915 INFO L87 Difference]: Start difference. First operand 713 states and 2384 transitions. Second operand has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 35 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:01:39,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:01:39,996 INFO L93 Difference]: Finished difference Result 2661 states and 8900 transitions. [2022-11-20 20:01:39,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-20 20:01:39,998 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 35 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:01:39,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:01:40,007 INFO L225 Difference]: With dead ends: 2661 [2022-11-20 20:01:40,008 INFO L226 Difference]: Without dead ends: 2661 [2022-11-20 20:01:40,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1131 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=558, Invalid=4134, Unknown=0, NotChecked=0, Total=4692 [2022-11-20 20:01:40,009 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1109 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 3417 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1109 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 3845 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 3417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 393 IncrementalHoareTripleChecker+Unchecked, 20.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:01:40,010 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1109 Valid, 277 Invalid, 3845 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 3417 Invalid, 0 Unknown, 393 Unchecked, 20.3s Time] [2022-11-20 20:01:40,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2661 states. [2022-11-20 20:01:40,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2661 to 917. [2022-11-20 20:01:40,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 917 states, 904 states have (on average 3.5121681415929205) internal successors, (3175), 916 states have internal predecessors, (3175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:01:40,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 3175 transitions. [2022-11-20 20:01:40,046 INFO L78 Accepts]: Start accepts. Automaton has 917 states and 3175 transitions. Word has length 12 [2022-11-20 20:01:40,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:01:40,047 INFO L495 AbstractCegarLoop]: Abstraction has 917 states and 3175 transitions. [2022-11-20 20:01:40,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 35 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:01:40,047 INFO L276 IsEmpty]: Start isEmpty. Operand 917 states and 3175 transitions. [2022-11-20 20:01:40,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:01:40,048 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:01:40,048 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2022-11-20 20:01:40,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2022-11-20 20:01:40,263 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (59)] Ended with exit code 0 [2022-11-20 20:01:40,466 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2022-11-20 20:01:40,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:01:40,661 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:01:40,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:01:40,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1536815591, now seen corresponding path program 2 times [2022-11-20 20:01:40,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:01:40,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1611355497] [2022-11-20 20:01:40,662 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:01:40,662 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:01:40,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:01:40,663 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:01:40,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2022-11-20 20:01:40,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:01:40,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:01:40,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:01:40,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:01:40,990 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:01:40,990 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:01:41,344 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:01:41,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:01:42,929 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:01:42,929 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:01:42,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1611355497] [2022-11-20 20:01:42,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1611355497] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:01:42,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1251403284] [2022-11-20 20:01:42,930 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:01:42,930 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:01:42,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:01:42,931 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:01:42,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2022-11-20 20:01:43,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:01:43,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:01:43,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:01:43,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:01:43,999 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:43,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:01:44,894 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:44,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1251403284] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:01:44,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430722252] [2022-11-20 20:01:44,895 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:01:44,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:01:44,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:01:44,896 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:01:44,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-11-20 20:01:45,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:01:45,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:01:45,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:01:45,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:01:45,488 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:45,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:01:45,739 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:01:45,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430722252] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:01:45,739 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:01:45,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 34 [2022-11-20 20:01:45,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571157421] [2022-11-20 20:01:45,740 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:01:45,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 20:01:45,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:01:45,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 20:01:45,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1049, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 20:01:45,741 INFO L87 Difference]: Start difference. First operand 917 states and 3175 transitions. Second operand has 35 states, 35 states have (on average 1.4) internal successors, (49), 34 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:17,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:02:17,419 INFO L93 Difference]: Finished difference Result 3083 states and 9746 transitions. [2022-11-20 20:02:17,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-20 20:02:17,421 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4) internal successors, (49), 34 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:02:17,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:02:17,432 INFO L225 Difference]: With dead ends: 3083 [2022-11-20 20:02:17,433 INFO L226 Difference]: Without dead ends: 3083 [2022-11-20 20:02:17,434 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1300 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=718, Invalid=4538, Unknown=0, NotChecked=0, Total=5256 [2022-11-20 20:02:17,434 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 1351 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 3452 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1351 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 3752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 3452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 266 IncrementalHoareTripleChecker+Unchecked, 18.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:02:17,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1351 Valid, 280 Invalid, 3752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 3452 Invalid, 0 Unknown, 266 Unchecked, 18.3s Time] [2022-11-20 20:02:17,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3083 states. [2022-11-20 20:02:17,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3083 to 962. [2022-11-20 20:02:17,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 962 states, 949 states have (on average 3.512118018967334) internal successors, (3333), 961 states have internal predecessors, (3333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:17,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 962 states to 962 states and 3333 transitions. [2022-11-20 20:02:17,488 INFO L78 Accepts]: Start accepts. Automaton has 962 states and 3333 transitions. Word has length 12 [2022-11-20 20:02:17,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:02:17,489 INFO L495 AbstractCegarLoop]: Abstraction has 962 states and 3333 transitions. [2022-11-20 20:02:17,489 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4) internal successors, (49), 34 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:17,489 INFO L276 IsEmpty]: Start isEmpty. Operand 962 states and 3333 transitions. [2022-11-20 20:02:17,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 20:02:17,490 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:02:17,490 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1] [2022-11-20 20:02:17,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2022-11-20 20:02:17,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (61)] Forceful destruction successful, exit code 0 [2022-11-20 20:02:17,901 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (62)] Ended with exit code 0 [2022-11-20 20:02:18,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:02:18,098 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:02:18,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:02:18,098 INFO L85 PathProgramCache]: Analyzing trace with hash 33320481, now seen corresponding path program 3 times [2022-11-20 20:02:18,099 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:02:18,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2092972391] [2022-11-20 20:02:18,099 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:02:18,099 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:02:18,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:02:18,100 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:02:18,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2022-11-20 20:02:18,355 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 20:02:18,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:02:18,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:02:18,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:02:18,488 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:02:18,488 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:02:18,953 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:02:18,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:02:21,956 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:02:21,956 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:02:21,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2092972391] [2022-11-20 20:02:21,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2092972391] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:02:21,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1572961147] [2022-11-20 20:02:21,957 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:02:21,957 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:02:21,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:02:21,959 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:02:21,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2022-11-20 20:02:22,807 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 20:02:22,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:02:22,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:02:22,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:02:22,934 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:02:22,935 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:02:23,229 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:02:23,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:02:26,445 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:02:26,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1572961147] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:02:26,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1183847599] [2022-11-20 20:02:26,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:02:26,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:02:26,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:02:26,447 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:02:26,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-11-20 20:02:28,969 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 20:02:28,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:02:28,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:02:28,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:02:29,099 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:02:29,099 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:02:29,250 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:02:29,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:02:34,284 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:02:34,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1183847599] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:02:34,284 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:02:34,284 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11, 11] total 42 [2022-11-20 20:02:34,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701804310] [2022-11-20 20:02:34,284 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:02:34,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-20 20:02:34,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:02:34,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-20 20:02:34,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=490, Invalid=1402, Unknown=0, NotChecked=0, Total=1892 [2022-11-20 20:02:34,286 INFO L87 Difference]: Start difference. First operand 962 states and 3333 transitions. Second operand has 44 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 43 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:56,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:02:56,652 INFO L93 Difference]: Finished difference Result 9420 states and 33039 transitions. [2022-11-20 20:02:56,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-20 20:02:56,654 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 43 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-20 20:02:56,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:02:56,676 INFO L225 Difference]: With dead ends: 9420 [2022-11-20 20:02:56,676 INFO L226 Difference]: Without dead ends: 9420 [2022-11-20 20:02:56,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 20.5s TimeCoverageRelationStatistics Valid=841, Invalid=2021, Unknown=0, NotChecked=0, Total=2862 [2022-11-20 20:02:56,678 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 5658 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 3596 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5658 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 3631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 3596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.9s IncrementalHoareTripleChecker+Time [2022-11-20 20:02:56,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5658 Valid, 288 Invalid, 3631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 3596 Invalid, 0 Unknown, 0 Unchecked, 11.9s Time] [2022-11-20 20:02:56,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9420 states. [2022-11-20 20:02:56,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9420 to 974. [2022-11-20 20:02:56,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 974 states, 961 states have (on average 3.4932362122788763) internal successors, (3357), 973 states have internal predecessors, (3357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:56,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 974 states to 974 states and 3357 transitions. [2022-11-20 20:02:56,775 INFO L78 Accepts]: Start accepts. Automaton has 974 states and 3357 transitions. Word has length 12 [2022-11-20 20:02:56,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:02:56,775 INFO L495 AbstractCegarLoop]: Abstraction has 974 states and 3357 transitions. [2022-11-20 20:02:56,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 43 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:56,775 INFO L276 IsEmpty]: Start isEmpty. Operand 974 states and 3357 transitions. [2022-11-20 20:02:56,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:02:56,776 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:02:56,776 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:02:56,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2022-11-20 20:02:56,984 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2022-11-20 20:02:57,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (65)] Ended with exit code 0 [2022-11-20 20:02:57,377 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:02:57,377 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:02:57,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:02:57,377 INFO L85 PathProgramCache]: Analyzing trace with hash -760728890, now seen corresponding path program 1 times [2022-11-20 20:02:57,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:02:57,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [953694523] [2022-11-20 20:02:57,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:02:57,378 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:02:57,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:02:57,379 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:02:57,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2022-11-20 20:02:57,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:02:57,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 20:02:57,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:02:57,750 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:02:57,750 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:02:58,234 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:02:58,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:02:58,806 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:02:58,806 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:02:58,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [953694523] [2022-11-20 20:02:58,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [953694523] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:02:58,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [235435901] [2022-11-20 20:02:58,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:02:58,807 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:02:58,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:02:58,808 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:02:58,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2022-11-20 20:02:59,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:02:59,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-20 20:02:59,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:02:59,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 20:02:59,333 INFO L321 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2022-11-20 20:02:59,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2022-11-20 20:02:59,514 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:02:59,514 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:02:59,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [235435901] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:02:59,514 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:02:59,514 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [5, 5] total 11 [2022-11-20 20:02:59,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883138350] [2022-11-20 20:02:59,515 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:02:59,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 20:02:59,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:02:59,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 20:02:59,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:02:59,516 INFO L87 Difference]: Start difference. First operand 974 states and 3357 transitions. Second operand has 3 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:59,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:02:59,575 INFO L93 Difference]: Finished difference Result 973 states and 3356 transitions. [2022-11-20 20:02:59,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:02:59,575 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:02:59,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:02:59,577 INFO L225 Difference]: With dead ends: 973 [2022-11-20 20:02:59,577 INFO L226 Difference]: Without dead ends: 973 [2022-11-20 20:02:59,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2022-11-20 20:02:59,578 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:02:59,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 26 Unchecked, 0.1s Time] [2022-11-20 20:02:59,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 973 states. [2022-11-20 20:02:59,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 973 to 973. [2022-11-20 20:02:59,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 973 states, 961 states have (on average 3.4921956295525494) internal successors, (3356), 972 states have internal predecessors, (3356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:59,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 973 states to 973 states and 3356 transitions. [2022-11-20 20:02:59,596 INFO L78 Accepts]: Start accepts. Automaton has 973 states and 3356 transitions. Word has length 13 [2022-11-20 20:02:59,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:02:59,596 INFO L495 AbstractCegarLoop]: Abstraction has 973 states and 3356 transitions. [2022-11-20 20:02:59,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:02:59,597 INFO L276 IsEmpty]: Start isEmpty. Operand 973 states and 3356 transitions. [2022-11-20 20:02:59,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:02:59,598 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:02:59,598 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:02:59,606 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (67)] Ended with exit code 0 [2022-11-20 20:02:59,801 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (68)] Ended with exit code 0 [2022-11-20 20:02:59,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:02:59,999 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:02:59,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:02:59,999 INFO L85 PathProgramCache]: Analyzing trace with hash -530466923, now seen corresponding path program 1 times [2022-11-20 20:02:59,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:02:59,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1259455935] [2022-11-20 20:03:00,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:00,000 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:03:00,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:03:00,001 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:03:00,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2022-11-20 20:03:00,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:03:00,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:03:00,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:00,344 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:03:00,345 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:03:00,717 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:00,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:02,369 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:02,369 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:03:02,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1259455935] [2022-11-20 20:03:02,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1259455935] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:02,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1201250325] [2022-11-20 20:03:02,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:02,371 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:03:02,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:03:02,372 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:03:02,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2022-11-20 20:03:02,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:03:02,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:03:02,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:03,483 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:03,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:04,470 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:04,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1201250325] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:04,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195241515] [2022-11-20 20:03:04,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:03:04,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:04,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:04,472 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:04,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2022-11-20 20:03:04,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:03:04,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:03:04,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:05,091 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:05,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:05,166 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:05,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195241515] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:05,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:03:05,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 35 [2022-11-20 20:03:05,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652254755] [2022-11-20 20:03:05,167 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:05,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-20 20:03:05,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:03:05,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-20 20:03:05,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1118, Unknown=0, NotChecked=0, Total=1260 [2022-11-20 20:03:05,169 INFO L87 Difference]: Start difference. First operand 973 states and 3356 transitions. Second operand has 36 states, 36 states have (on average 1.4722222222222223) internal successors, (53), 35 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:24,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:03:24,080 INFO L93 Difference]: Finished difference Result 2081 states and 6826 transitions. [2022-11-20 20:03:24,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-20 20:03:24,081 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.4722222222222223) internal successors, (53), 35 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:03:24,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:03:24,085 INFO L225 Difference]: With dead ends: 2081 [2022-11-20 20:03:24,085 INFO L226 Difference]: Without dead ends: 2081 [2022-11-20 20:03:24,086 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 747 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=412, Invalid=2894, Unknown=0, NotChecked=0, Total=3306 [2022-11-20 20:03:24,086 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 597 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 2564 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 597 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 3536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 2564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 952 IncrementalHoareTripleChecker+Unchecked, 13.9s IncrementalHoareTripleChecker+Time [2022-11-20 20:03:24,087 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [597 Valid, 223 Invalid, 3536 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 2564 Invalid, 0 Unknown, 952 Unchecked, 13.9s Time] [2022-11-20 20:03:24,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2081 states. [2022-11-20 20:03:24,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2081 to 1022. [2022-11-20 20:03:24,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1022 states, 1010 states have (on average 3.485148514851485) internal successors, (3520), 1021 states have internal predecessors, (3520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:24,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1022 states to 1022 states and 3520 transitions. [2022-11-20 20:03:24,114 INFO L78 Accepts]: Start accepts. Automaton has 1022 states and 3520 transitions. Word has length 13 [2022-11-20 20:03:24,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:03:24,115 INFO L495 AbstractCegarLoop]: Abstraction has 1022 states and 3520 transitions. [2022-11-20 20:03:24,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.4722222222222223) internal successors, (53), 35 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:03:24,115 INFO L276 IsEmpty]: Start isEmpty. Operand 1022 states and 3520 transitions. [2022-11-20 20:03:24,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:03:24,116 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:03:24,116 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:03:24,120 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (70)] Ended with exit code 0 [2022-11-20 20:03:24,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2022-11-20 20:03:24,540 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (69)] Ended with exit code 0 [2022-11-20 20:03:24,717 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:03:24,718 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:03:24,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:03:24,718 INFO L85 PathProgramCache]: Analyzing trace with hash -338785205, now seen corresponding path program 2 times [2022-11-20 20:03:24,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:03:24,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [713644811] [2022-11-20 20:03:24,718 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:03:24,719 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:03:24,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:03:24,719 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:03:24,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2022-11-20 20:03:24,945 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:03:24,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:03:24,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:03:24,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:25,079 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:03:25,080 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:03:25,455 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:25,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:27,146 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:03:27,146 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:03:27,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [713644811] [2022-11-20 20:03:27,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [713644811] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:27,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [722899293] [2022-11-20 20:03:27,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:03:27,147 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:03:27,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:03:27,148 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:03:27,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2022-11-20 20:03:27,609 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:03:27,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:03:27,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:03:27,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:28,413 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:28,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:29,459 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:29,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [722899293] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:29,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188855195] [2022-11-20 20:03:29,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:03:29,459 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:03:29,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:03:29,460 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:03:29,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2022-11-20 20:03:29,718 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:03:29,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:03:29,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:03:29,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:03:29,928 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:29,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:03:30,216 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:03:30,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188855195] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:03:30,216 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:03:30,216 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 34 [2022-11-20 20:03:30,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596333476] [2022-11-20 20:03:30,216 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:03:30,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-20 20:03:30,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:03:30,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-20 20:03:30,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1049, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 20:03:30,218 INFO L87 Difference]: Start difference. First operand 1022 states and 3520 transitions. Second operand has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 34 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:05,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:04:05,302 INFO L93 Difference]: Finished difference Result 2219 states and 7005 transitions. [2022-11-20 20:04:05,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-20 20:04:05,305 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 34 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:04:05,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:04:05,309 INFO L225 Difference]: With dead ends: 2219 [2022-11-20 20:04:05,309 INFO L226 Difference]: Without dead ends: 2219 [2022-11-20 20:04:05,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 925 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=541, Invalid=3619, Unknown=0, NotChecked=0, Total=4160 [2022-11-20 20:04:05,310 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 891 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 2852 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 891 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 3158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 2852 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 284 IncrementalHoareTripleChecker+Unchecked, 19.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:04:05,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [891 Valid, 264 Invalid, 3158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 2852 Invalid, 0 Unknown, 284 Unchecked, 19.6s Time] [2022-11-20 20:04:05,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2219 states. [2022-11-20 20:04:05,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2219 to 1026. [2022-11-20 20:04:05,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1026 states, 1014 states have (on average 3.485207100591716) internal successors, (3534), 1025 states have internal predecessors, (3534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:05,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1026 states to 1026 states and 3534 transitions. [2022-11-20 20:04:05,339 INFO L78 Accepts]: Start accepts. Automaton has 1026 states and 3534 transitions. Word has length 13 [2022-11-20 20:04:05,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:04:05,339 INFO L495 AbstractCegarLoop]: Abstraction has 1026 states and 3534 transitions. [2022-11-20 20:04:05,339 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 34 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:05,339 INFO L276 IsEmpty]: Start isEmpty. Operand 1026 states and 3534 transitions. [2022-11-20 20:04:05,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:04:05,347 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:04:05,347 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:04:05,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2022-11-20 20:04:05,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (73)] Forceful destruction successful, exit code 0 [2022-11-20 20:04:05,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2022-11-20 20:04:05,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:04:05,948 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:04:05,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:04:05,949 INFO L85 PathProgramCache]: Analyzing trace with hash 917689251, now seen corresponding path program 2 times [2022-11-20 20:04:05,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:04:05,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [230276987] [2022-11-20 20:04:05,949 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:04:05,949 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:04:05,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:04:05,951 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:04:05,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2022-11-20 20:04:06,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:04:06,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:06,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:04:06,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:06,318 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:04:06,318 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:04:06,681 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:04:06,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:08,394 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:04:08,394 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:04:08,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [230276987] [2022-11-20 20:04:08,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [230276987] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:08,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [688840397] [2022-11-20 20:04:08,395 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:04:08,395 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:04:08,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:04:08,396 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:04:08,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (76)] Waiting until timeout for monitored process [2022-11-20 20:04:08,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:04:08,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:08,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:04:08,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:08,995 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:04:08,995 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:04:09,564 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:09,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:10,803 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:10,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [688840397] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:10,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226261646] [2022-11-20 20:04:10,804 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:04:10,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:04:10,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:04:10,805 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:04:10,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2022-11-20 20:04:11,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:04:11,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:11,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:04:11,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:11,205 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:04:11,206 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:04:11,520 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:11,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:11,840 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:11,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226261646] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:11,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:04:11,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 32 [2022-11-20 20:04:11,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396881956] [2022-11-20 20:04:11,840 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:04:11,841 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-20 20:04:11,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:04:11,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-20 20:04:11,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=892, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 20:04:11,842 INFO L87 Difference]: Start difference. First operand 1026 states and 3534 transitions. Second operand has 33 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:32,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:04:32,355 INFO L93 Difference]: Finished difference Result 2586 states and 8505 transitions. [2022-11-20 20:04:32,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-20 20:04:32,357 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:04:32,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:04:32,362 INFO L225 Difference]: With dead ends: 2586 [2022-11-20 20:04:32,362 INFO L226 Difference]: Without dead ends: 2586 [2022-11-20 20:04:32,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 775 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=440, Invalid=2212, Unknown=0, NotChecked=0, Total=2652 [2022-11-20 20:04:32,363 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 1122 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 1735 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1122 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 2315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 1735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 560 IncrementalHoareTripleChecker+Unchecked, 11.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:04:32,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1122 Valid, 174 Invalid, 2315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 1735 Invalid, 0 Unknown, 560 Unchecked, 11.4s Time] [2022-11-20 20:04:32,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2586 states. [2022-11-20 20:04:32,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2586 to 1266. [2022-11-20 20:04:32,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1266 states, 1254 states have (on average 3.5191387559808613) internal successors, (4413), 1265 states have internal predecessors, (4413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:32,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1266 states to 1266 states and 4413 transitions. [2022-11-20 20:04:32,394 INFO L78 Accepts]: Start accepts. Automaton has 1266 states and 4413 transitions. Word has length 13 [2022-11-20 20:04:32,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:04:32,394 INFO L495 AbstractCegarLoop]: Abstraction has 1266 states and 4413 transitions. [2022-11-20 20:04:32,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:32,395 INFO L276 IsEmpty]: Start isEmpty. Operand 1266 states and 4413 transitions. [2022-11-20 20:04:32,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:04:32,397 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:04:32,397 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:04:32,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (75)] Forceful destruction successful, exit code 0 [2022-11-20 20:04:32,614 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (76)] Ended with exit code 0 [2022-11-20 20:04:32,816 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2022-11-20 20:04:33,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:04:33,011 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:04:33,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:04:33,011 INFO L85 PathProgramCache]: Analyzing trace with hash 515926803, now seen corresponding path program 3 times [2022-11-20 20:04:33,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:04:33,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2056971708] [2022-11-20 20:04:33,012 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:04:33,012 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:04:33,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:04:33,013 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:04:33,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2022-11-20 20:04:33,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 20:04:33,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:33,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:04:33,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:33,540 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:04:33,540 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:04:33,640 INFO L350 Elim1Store]: Elim1 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 15 treesize of output 11 [2022-11-20 20:04:33,828 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:33,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:34,253 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:34,253 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:04:34,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2056971708] [2022-11-20 20:04:34,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2056971708] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:34,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1638192070] [2022-11-20 20:04:34,253 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:04:34,253 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:04:34,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:04:34,254 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:04:34,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (79)] Waiting until timeout for monitored process [2022-11-20 20:04:35,000 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 20:04:35,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:35,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-20 20:04:35,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:35,166 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:35,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:35,369 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:35,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1638192070] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:35,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215770887] [2022-11-20 20:04:35,369 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:04:35,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:04:35,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:04:35,370 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:04:35,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2022-11-20 20:04:35,642 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 20:04:35,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:35,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-20 20:04:35,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:35,781 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:35,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:35,957 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:35,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [215770887] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:35,958 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:04:35,958 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 21 [2022-11-20 20:04:35,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831294962] [2022-11-20 20:04:35,958 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:04:35,959 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-20 20:04:35,959 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:04:35,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-20 20:04:35,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2022-11-20 20:04:35,960 INFO L87 Difference]: Start difference. First operand 1266 states and 4413 transitions. Second operand has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:39,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:04:39,820 INFO L93 Difference]: Finished difference Result 1625 states and 5305 transitions. [2022-11-20 20:04:39,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 20:04:39,821 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:04:39,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:04:39,825 INFO L225 Difference]: With dead ends: 1625 [2022-11-20 20:04:39,825 INFO L226 Difference]: Without dead ends: 1625 [2022-11-20 20:04:39,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=266, Invalid=790, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 20:04:39,825 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 441 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 441 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-11-20 20:04:39,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [441 Valid, 77 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 872 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-11-20 20:04:39,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1625 states. [2022-11-20 20:04:39,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1625 to 1135. [2022-11-20 20:04:39,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1135 states, 1123 states have (on average 3.421193232413179) internal successors, (3842), 1134 states have internal predecessors, (3842), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:39,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1135 states to 1135 states and 3842 transitions. [2022-11-20 20:04:39,848 INFO L78 Accepts]: Start accepts. Automaton has 1135 states and 3842 transitions. Word has length 13 [2022-11-20 20:04:39,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:04:39,848 INFO L495 AbstractCegarLoop]: Abstraction has 1135 states and 3842 transitions. [2022-11-20 20:04:39,849 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:04:39,849 INFO L276 IsEmpty]: Start isEmpty. Operand 1135 states and 3842 transitions. [2022-11-20 20:04:39,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:04:39,850 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:04:39,850 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1] [2022-11-20 20:04:39,864 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (78)] Ended with exit code 0 [2022-11-20 20:04:40,070 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2022-11-20 20:04:40,268 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (79)] Ended with exit code 0 [2022-11-20 20:04:40,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:04:40,464 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:04:40,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:04:40,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1288777133, now seen corresponding path program 3 times [2022-11-20 20:04:40,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:04:40,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1726636607] [2022-11-20 20:04:40,465 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:04:40,465 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:04:40,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:04:40,466 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:04:40,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2022-11-20 20:04:40,845 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 20:04:40,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:40,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-20 20:04:40,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:41,019 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:04:41,019 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:04:41,590 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:04:41,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:44,870 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:04:44,870 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:04:44,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1726636607] [2022-11-20 20:04:44,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1726636607] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:44,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1211359801] [2022-11-20 20:04:44,870 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:04:44,871 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:04:44,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:04:44,872 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:04:44,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2022-11-20 20:04:46,447 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 20:04:46,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:46,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-20 20:04:46,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:46,622 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:04:46,623 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:04:47,031 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:47,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:51,383 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:04:51,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1211359801] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:51,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407326598] [2022-11-20 20:04:51,384 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:04:51,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:04:51,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:04:51,386 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:04:51,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2022-11-20 20:04:51,916 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 20:04:51,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:04:51,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-20 20:04:51,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:04:53,876 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:53,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:04:56,337 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:04:56,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407326598] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:04:56,338 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:04:56,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10, 11, 10, 10] total 50 [2022-11-20 20:04:56,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217141778] [2022-11-20 20:04:56,338 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:04:56,338 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-20 20:04:56,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:04:56,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-20 20:04:56,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=2297, Unknown=0, NotChecked=0, Total=2550 [2022-11-20 20:04:56,340 INFO L87 Difference]: Start difference. First operand 1135 states and 3842 transitions. Second operand has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 50 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:06:52,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:06:52,972 INFO L93 Difference]: Finished difference Result 3319 states and 10842 transitions. [2022-11-20 20:06:52,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-20 20:06:52,975 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 50 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:06:52,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:06:52,984 INFO L225 Difference]: With dead ends: 3319 [2022-11-20 20:06:52,984 INFO L226 Difference]: Without dead ends: 3319 [2022-11-20 20:06:52,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2190 ImplicationChecksByTransitivity, 79.5s TimeCoverageRelationStatistics Valid=1237, Invalid=7883, Unknown=0, NotChecked=0, Total=9120 [2022-11-20 20:06:52,989 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 1620 mSDsluCounter, 519 mSDsCounter, 0 mSdLazyCounter, 6456 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 44.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1620 SdHoareTripleChecker+Valid, 539 SdHoareTripleChecker+Invalid, 6844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 6456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 322 IncrementalHoareTripleChecker+Unchecked, 48.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:06:52,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1620 Valid, 539 Invalid, 6844 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [66 Valid, 6456 Invalid, 0 Unknown, 322 Unchecked, 48.0s Time] [2022-11-20 20:06:52,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3319 states. [2022-11-20 20:06:53,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3319 to 1459. [2022-11-20 20:06:53,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1459 states, 1447 states have (on average 3.567380787836904) internal successors, (5162), 1458 states have internal predecessors, (5162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:06:53,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1459 states to 1459 states and 5162 transitions. [2022-11-20 20:06:53,041 INFO L78 Accepts]: Start accepts. Automaton has 1459 states and 5162 transitions. Word has length 13 [2022-11-20 20:06:53,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:06:53,042 INFO L495 AbstractCegarLoop]: Abstraction has 1459 states and 5162 transitions. [2022-11-20 20:06:53,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 50 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:06:53,042 INFO L276 IsEmpty]: Start isEmpty. Operand 1459 states and 5162 transitions. [2022-11-20 20:06:53,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 20:06:53,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:06:53,044 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2022-11-20 20:06:53,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (81)] Forceful destruction successful, exit code 0 [2022-11-20 20:06:53,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2022-11-20 20:06:53,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (82)] Forceful destruction successful, exit code 0 [2022-11-20 20:06:53,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:06:53,659 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:06:53,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:06:53,659 INFO L85 PathProgramCache]: Analyzing trace with hash 265308004, now seen corresponding path program 4 times [2022-11-20 20:06:53,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:06:53,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1250522259] [2022-11-20 20:06:53,660 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:06:53,660 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:06:53,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:06:53,661 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:06:53,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (84)] Waiting until timeout for monitored process [2022-11-20 20:06:53,905 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:06:53,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:06:53,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:06:53,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:06:54,086 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:06:54,086 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:06:54,402 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:06:54,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:06:56,003 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:06:56,003 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:06:56,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1250522259] [2022-11-20 20:06:56,004 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1250522259] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:06:56,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [226409462] [2022-11-20 20:06:56,004 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:06:56,004 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:06:56,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:06:56,005 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:06:56,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (85)] Waiting until timeout for monitored process [2022-11-20 20:06:56,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:06:56,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:06:56,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 20:06:56,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:06:57,403 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:06:57,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:06:59,200 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:06:59,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [226409462] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:06:59,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248987109] [2022-11-20 20:06:59,201 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:06:59,201 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:06:59,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:06:59,203 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:06:59,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2022-11-20 20:06:59,444 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:06:59,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:06:59,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:06:59,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:07:00,070 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:07:00,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:07:00,165 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:07:00,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248987109] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:07:00,165 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:07:00,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 11, 11, 11, 11] total 41 [2022-11-20 20:07:00,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929232970] [2022-11-20 20:07:00,166 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:07:00,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-20 20:07:00,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:07:00,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-20 20:07:00,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2022-11-20 20:07:00,168 INFO L87 Difference]: Start difference. First operand 1459 states and 5162 transitions. Second operand has 43 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 42 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:07:30,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:07:30,903 INFO L93 Difference]: Finished difference Result 3786 states and 11935 transitions. [2022-11-20 20:07:30,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-20 20:07:30,904 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 42 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-20 20:07:30,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:07:30,911 INFO L225 Difference]: With dead ends: 3786 [2022-11-20 20:07:30,911 INFO L226 Difference]: Without dead ends: 3786 [2022-11-20 20:07:30,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2451 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=1511, Invalid=7045, Unknown=0, NotChecked=0, Total=8556 [2022-11-20 20:07:30,913 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 3435 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 5811 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3435 SdHoareTripleChecker+Valid, 472 SdHoareTripleChecker+Invalid, 5922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 5811 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:07:30,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3435 Valid, 472 Invalid, 5922 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [111 Valid, 5811 Invalid, 0 Unknown, 0 Unchecked, 13.1s Time] [2022-11-20 20:07:30,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3786 states. [2022-11-20 20:07:30,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3786 to 1631. [2022-11-20 20:07:30,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1631 states, 1619 states have (on average 3.596046942557134) internal successors, (5822), 1630 states have internal predecessors, (5822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:07:30,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1631 states to 1631 states and 5822 transitions. [2022-11-20 20:07:30,965 INFO L78 Accepts]: Start accepts. Automaton has 1631 states and 5822 transitions. Word has length 13 [2022-11-20 20:07:30,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:07:30,965 INFO L495 AbstractCegarLoop]: Abstraction has 1631 states and 5822 transitions. [2022-11-20 20:07:30,965 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.2380952380952381) internal successors, (52), 42 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:07:30,965 INFO L276 IsEmpty]: Start isEmpty. Operand 1631 states and 5822 transitions. [2022-11-20 20:07:30,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 20:07:30,966 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:07:30,966 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:07:30,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (84)] Forceful destruction successful, exit code 0 [2022-11-20 20:07:31,173 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2022-11-20 20:07:31,370 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (85)] Ended with exit code 0 [2022-11-20 20:07:31,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:07:31,567 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:07:31,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:07:31,568 INFO L85 PathProgramCache]: Analyzing trace with hash 1731820423, now seen corresponding path program 1 times [2022-11-20 20:07:31,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:07:31,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [718180042] [2022-11-20 20:07:31,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:07:31,568 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:07:31,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:07:31,569 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:07:31,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2022-11-20 20:07:31,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:07:31,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 20:07:31,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:07:31,843 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:07:31,843 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:07:31,843 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:07:31,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [718180042] [2022-11-20 20:07:31,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [718180042] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:07:31,843 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:07:31,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:07:31,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328650433] [2022-11-20 20:07:31,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:07:31,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:07:31,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:07:31,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:07:31,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:07:31,845 INFO L87 Difference]: Start difference. First operand 1631 states and 5822 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:07:31,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:07:31,989 INFO L93 Difference]: Finished difference Result 1602 states and 5743 transitions. [2022-11-20 20:07:31,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:07:31,990 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 20:07:31,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:07:31,993 INFO L225 Difference]: With dead ends: 1602 [2022-11-20 20:07:31,993 INFO L226 Difference]: Without dead ends: 1602 [2022-11-20 20:07:31,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:07:31,994 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 40 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:07:31,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 2 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:07:31,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1602 states. [2022-11-20 20:07:32,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1602 to 1602. [2022-11-20 20:07:32,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1602 states, 1593 states have (on average 3.605147520401758) internal successors, (5743), 1601 states have internal predecessors, (5743), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:07:32,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1602 states to 1602 states and 5743 transitions. [2022-11-20 20:07:32,043 INFO L78 Accepts]: Start accepts. Automaton has 1602 states and 5743 transitions. Word has length 14 [2022-11-20 20:07:32,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:07:32,043 INFO L495 AbstractCegarLoop]: Abstraction has 1602 states and 5743 transitions. [2022-11-20 20:07:32,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:07:32,044 INFO L276 IsEmpty]: Start isEmpty. Operand 1602 states and 5743 transitions. [2022-11-20 20:07:32,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 20:07:32,046 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:07:32,046 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:07:32,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (87)] Forceful destruction successful, exit code 0 [2022-11-20 20:07:32,246 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:07:32,247 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:07:32,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:07:32,247 INFO L85 PathProgramCache]: Analyzing trace with hash -1816804305, now seen corresponding path program 1 times [2022-11-20 20:07:32,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:07:32,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [839398891] [2022-11-20 20:07:32,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:07:32,247 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:07:32,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:07:32,248 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:07:32,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (88)] Waiting until timeout for monitored process [2022-11-20 20:07:32,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:07:32,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:07:32,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:07:32,609 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:07:32,610 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:07:33,082 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:07:33,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:07:34,827 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:07:34,828 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:07:34,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [839398891] [2022-11-20 20:07:34,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [839398891] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:07:34,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [537287686] [2022-11-20 20:07:34,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:07:34,828 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:07:34,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:07:34,831 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:07:34,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (89)] Waiting until timeout for monitored process [2022-11-20 20:07:35,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:07:35,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:07:35,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:07:35,990 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:07:35,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:07:37,032 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:07:37,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [537287686] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:07:37,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808359465] [2022-11-20 20:07:37,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:07:37,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:07:37,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:07:37,034 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:07:37,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2022-11-20 20:07:37,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:07:37,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:07:37,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:07:37,421 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:07:37,422 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:07:38,381 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:07:38,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:07:40,103 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:07:40,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808359465] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:07:40,103 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:07:40,103 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 45 [2022-11-20 20:07:40,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880588894] [2022-11-20 20:07:40,103 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:07:40,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-20 20:07:40,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:07:40,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-20 20:07:40,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=1848, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 20:07:40,105 INFO L87 Difference]: Start difference. First operand 1602 states and 5743 transitions. Second operand has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 45 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:08:10,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:10,009 INFO L93 Difference]: Finished difference Result 2552 states and 8670 transitions. [2022-11-20 20:08:10,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-20 20:08:10,011 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 45 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 20:08:10,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:10,016 INFO L225 Difference]: With dead ends: 2552 [2022-11-20 20:08:10,016 INFO L226 Difference]: Without dead ends: 2552 [2022-11-20 20:08:10,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=692, Invalid=4858, Unknown=0, NotChecked=0, Total=5550 [2022-11-20 20:08:10,017 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 646 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 2708 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 646 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 2800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2708 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 13.8s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:10,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [646 Valid, 319 Invalid, 2800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2708 Invalid, 0 Unknown, 57 Unchecked, 13.8s Time] [2022-11-20 20:08:10,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2552 states. [2022-11-20 20:08:10,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2552 to 1728. [2022-11-20 20:08:10,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1728 states, 1719 states have (on average 3.602675974403723) internal successors, (6193), 1727 states have internal predecessors, (6193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:08:10,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1728 states to 1728 states and 6193 transitions. [2022-11-20 20:08:10,060 INFO L78 Accepts]: Start accepts. Automaton has 1728 states and 6193 transitions. Word has length 14 [2022-11-20 20:08:10,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:10,060 INFO L495 AbstractCegarLoop]: Abstraction has 1728 states and 6193 transitions. [2022-11-20 20:08:10,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 45 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:08:10,060 INFO L276 IsEmpty]: Start isEmpty. Operand 1728 states and 6193 transitions. [2022-11-20 20:08:10,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-20 20:08:10,063 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:10,064 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:08:10,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2022-11-20 20:08:10,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (88)] Forceful destruction successful, exit code 0 [2022-11-20 20:08:10,476 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (89)] Ended with exit code 0 [2022-11-20 20:08:10,672 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:08:10,672 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:08:10,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:10,672 INFO L85 PathProgramCache]: Analyzing trace with hash 1599665143, now seen corresponding path program 2 times [2022-11-20 20:08:10,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:08:10,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [530907125] [2022-11-20 20:08:10,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:08:10,673 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:08:10,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:08:10,674 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:08:10,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (91)] Waiting until timeout for monitored process [2022-11-20 20:08:10,941 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:08:10,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:08:10,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:08:10,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:08:11,074 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:08:11,074 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:08:11,470 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:11,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:08:13,092 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:13,092 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:08:13,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [530907125] [2022-11-20 20:08:13,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [530907125] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:08:13,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1538007729] [2022-11-20 20:08:13,093 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:08:13,093 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:08:13,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:08:13,094 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:08:13,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (92)] Waiting until timeout for monitored process [2022-11-20 20:08:13,619 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:08:13,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:08:13,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:08:13,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:08:13,737 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:08:13,737 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:08:14,293 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:08:14,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:08:15,485 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:08:15,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1538007729] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:08:15,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024003794] [2022-11-20 20:08:15,485 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:08:15,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:08:15,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:08:15,486 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:08:15,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2022-11-20 20:08:15,781 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:08:15,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:08:15,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:08:15,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:08:15,931 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:08:15,932 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:08:16,223 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:08:16,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:08:16,517 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:08:16,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024003794] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:08:16,518 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:08:16,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 32 [2022-11-20 20:08:16,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615632641] [2022-11-20 20:08:16,518 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:08:16,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-20 20:08:16,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:08:16,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-20 20:08:16,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=892, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 20:08:16,519 INFO L87 Difference]: Start difference. First operand 1728 states and 6193 transitions. Second operand has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 32 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:08:32,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:32,840 INFO L93 Difference]: Finished difference Result 2445 states and 8206 transitions. [2022-11-20 20:08:32,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-20 20:08:32,842 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 32 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-20 20:08:32,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:32,846 INFO L225 Difference]: With dead ends: 2445 [2022-11-20 20:08:32,846 INFO L226 Difference]: Without dead ends: 2445 [2022-11-20 20:08:32,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=329, Invalid=1741, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 20:08:32,847 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 703 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 1286 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 703 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 1400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:32,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [703 Valid, 157 Invalid, 1400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1286 Invalid, 0 Unknown, 93 Unchecked, 8.7s Time] [2022-11-20 20:08:32,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2445 states. [2022-11-20 20:08:32,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2445 to 1727. [2022-11-20 20:08:32,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1727 states, 1718 states have (on average 3.60128055878929) internal successors, (6187), 1726 states have internal predecessors, (6187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:08:32,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1727 states to 1727 states and 6187 transitions. [2022-11-20 20:08:32,878 INFO L78 Accepts]: Start accepts. Automaton has 1727 states and 6187 transitions. Word has length 14 [2022-11-20 20:08:32,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:32,878 INFO L495 AbstractCegarLoop]: Abstraction has 1727 states and 6187 transitions. [2022-11-20 20:08:32,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 32 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:08:32,878 INFO L276 IsEmpty]: Start isEmpty. Operand 1727 states and 6187 transitions. [2022-11-20 20:08:32,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:08:32,880 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:32,881 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:08:32,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (91)] Forceful destruction successful, exit code 0 [2022-11-20 20:08:33,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (92)] Forceful destruction successful, exit code 0 [2022-11-20 20:08:33,301 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Ended with exit code 0 [2022-11-20 20:08:33,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:08:33,495 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:08:33,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:33,496 INFO L85 PathProgramCache]: Analyzing trace with hash 799441959, now seen corresponding path program 1 times [2022-11-20 20:08:33,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:08:33,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2029838668] [2022-11-20 20:08:33,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:33,496 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:08:33,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:08:33,497 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:08:33,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (94)] Waiting until timeout for monitored process [2022-11-20 20:08:33,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:33,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:08:33,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:08:33,889 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:08:33,889 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:08:34,299 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:34,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:08:36,052 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:08:36,052 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:08:36,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2029838668] [2022-11-20 20:08:36,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2029838668] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:08:36,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1092392905] [2022-11-20 20:08:36,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:36,053 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:08:36,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:08:36,054 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:08:36,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (95)] Waiting until timeout for monitored process [2022-11-20 20:08:36,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:36,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:08:36,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:08:37,222 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:08:37,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:08:38,219 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:08:38,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1092392905] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:08:38,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714473423] [2022-11-20 20:08:38,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:38,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:08:38,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:08:38,221 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:08:38,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2022-11-20 20:08:38,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:08:38,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:08:38,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:08:38,626 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:08:38,627 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:08:39,513 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:08:39,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:08:41,200 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:08:41,200 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714473423] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:08:41,200 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:08:41,200 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 45 [2022-11-20 20:08:41,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566941760] [2022-11-20 20:08:41,200 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:08:41,201 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-20 20:08:41,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:08:41,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-20 20:08:41,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=1848, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 20:08:41,202 INFO L87 Difference]: Start difference. First operand 1727 states and 6187 transitions. Second operand has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:09:30,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:09:30,175 INFO L93 Difference]: Finished difference Result 2569 states and 8213 transitions. [2022-11-20 20:09:30,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-20 20:09:30,178 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-20 20:09:30,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:09:30,182 INFO L225 Difference]: With dead ends: 2569 [2022-11-20 20:09:30,182 INFO L226 Difference]: Without dead ends: 2569 [2022-11-20 20:09:30,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2043 ImplicationChecksByTransitivity, 36.3s TimeCoverageRelationStatistics Valid=1000, Invalid=6656, Unknown=0, NotChecked=0, Total=7656 [2022-11-20 20:09:30,183 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1006 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 3367 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1006 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 3957 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 3367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 553 IncrementalHoareTripleChecker+Unchecked, 18.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:09:30,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1006 Valid, 331 Invalid, 3957 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 3367 Invalid, 0 Unknown, 553 Unchecked, 18.0s Time] [2022-11-20 20:09:30,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2569 states. [2022-11-20 20:09:30,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2569 to 1693. [2022-11-20 20:09:30,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1693 states, 1684 states have (on average 3.6045130641330165) internal successors, (6070), 1692 states have internal predecessors, (6070), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:09:30,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1693 states to 1693 states and 6070 transitions. [2022-11-20 20:09:30,255 INFO L78 Accepts]: Start accepts. Automaton has 1693 states and 6070 transitions. Word has length 15 [2022-11-20 20:09:30,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:09:30,255 INFO L495 AbstractCegarLoop]: Abstraction has 1693 states and 6070 transitions. [2022-11-20 20:09:30,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:09:30,256 INFO L276 IsEmpty]: Start isEmpty. Operand 1693 states and 6070 transitions. [2022-11-20 20:09:30,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:09:30,257 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:09:30,257 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:09:30,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Forceful destruction successful, exit code 0 [2022-11-20 20:09:30,468 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (95)] Ended with exit code 0 [2022-11-20 20:09:30,673 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (94)] Ended with exit code 0 [2022-11-20 20:09:30,865 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:09:30,865 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:09:30,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:09:30,866 INFO L85 PathProgramCache]: Analyzing trace with hash 751518365, now seen corresponding path program 2 times [2022-11-20 20:09:30,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:09:30,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1943103169] [2022-11-20 20:09:30,866 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:09:30,866 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:09:30,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:09:30,867 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:09:30,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (97)] Waiting until timeout for monitored process [2022-11-20 20:09:31,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:09:31,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:09:31,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:09:31,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:31,324 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:09:31,324 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:09:31,797 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:09:31,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:09:33,675 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:09:33,675 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:09:33,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1943103169] [2022-11-20 20:09:33,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1943103169] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:09:33,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1726124594] [2022-11-20 20:09:33,675 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:09:33,676 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:09:33,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:09:33,682 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:09:33,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (98)] Waiting until timeout for monitored process [2022-11-20 20:09:34,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:09:34,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:09:34,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:09:34,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:34,369 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:09:34,369 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:09:35,435 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:09:35,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:09:37,098 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:09:37,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1726124594] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:09:37,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090000121] [2022-11-20 20:09:37,099 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:09:37,099 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:09:37,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:09:37,100 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:09:37,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2022-11-20 20:09:37,420 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:09:37,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:09:37,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:09:37,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:37,554 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:09:37,555 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:09:38,089 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:09:38,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:09:39,009 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:09:39,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090000121] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:09:39,010 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:09:39,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 10, 10, 8, 8] total 41 [2022-11-20 20:09:39,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214764912] [2022-11-20 20:09:39,010 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:09:39,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-20 20:09:39,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:09:39,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-20 20:09:39,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=1474, Unknown=0, NotChecked=0, Total=1722 [2022-11-20 20:09:39,011 INFO L87 Difference]: Start difference. First operand 1693 states and 6070 transitions. Second operand has 42 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 41 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:10:07,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:10:07,845 INFO L93 Difference]: Finished difference Result 3332 states and 10689 transitions. [2022-11-20 20:10:07,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-20 20:10:07,847 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 41 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-20 20:10:07,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:10:07,852 INFO L225 Difference]: With dead ends: 3332 [2022-11-20 20:10:07,852 INFO L226 Difference]: Without dead ends: 3332 [2022-11-20 20:10:07,853 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1932 ImplicationChecksByTransitivity, 22.4s TimeCoverageRelationStatistics Valid=1098, Invalid=5222, Unknown=0, NotChecked=0, Total=6320 [2022-11-20 20:10:07,854 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 1174 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 1979 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1174 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 2617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1979 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 604 IncrementalHoareTripleChecker+Unchecked, 11.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:10:07,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1174 Valid, 144 Invalid, 2617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 1979 Invalid, 0 Unknown, 604 Unchecked, 11.6s Time] [2022-11-20 20:10:07,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3332 states. [2022-11-20 20:10:07,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3332 to 1842. [2022-11-20 20:10:07,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1842 states, 1833 states have (on average 3.569012547735952) internal successors, (6542), 1841 states have internal predecessors, (6542), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:10:07,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1842 states to 1842 states and 6542 transitions. [2022-11-20 20:10:07,925 INFO L78 Accepts]: Start accepts. Automaton has 1842 states and 6542 transitions. Word has length 15 [2022-11-20 20:10:07,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:10:07,926 INFO L495 AbstractCegarLoop]: Abstraction has 1842 states and 6542 transitions. [2022-11-20 20:10:07,926 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 41 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:10:07,926 INFO L276 IsEmpty]: Start isEmpty. Operand 1842 states and 6542 transitions. [2022-11-20 20:10:07,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:10:07,928 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:10:07,928 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:10:07,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (98)] Forceful destruction successful, exit code 0 [2022-11-20 20:10:08,142 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (97)] Ended with exit code 0 [2022-11-20 20:10:08,340 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2022-11-20 20:10:08,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:10:08,534 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:10:08,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:10:08,534 INFO L85 PathProgramCache]: Analyzing trace with hash -1978018581, now seen corresponding path program 1 times [2022-11-20 20:10:08,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:10:08,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1153863328] [2022-11-20 20:10:08,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:10:08,535 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:10:08,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:10:08,536 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:10:08,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (100)] Waiting until timeout for monitored process [2022-11-20 20:10:08,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:10:08,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:10:08,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:10:08,978 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:10:08,978 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:10:09,392 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:10:09,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:10:11,142 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:10:11,142 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:10:11,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1153863328] [2022-11-20 20:10:11,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1153863328] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:10:11,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [625084490] [2022-11-20 20:10:11,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:10:11,143 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:10:11,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:10:11,144 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:10:11,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (101)] Waiting until timeout for monitored process [2022-11-20 20:10:11,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:10:11,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-20 20:10:11,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:10:12,306 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:10:12,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:10:13,315 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:10:13,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [625084490] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:10:13,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480594204] [2022-11-20 20:10:13,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:10:13,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:10:13,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:10:13,317 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:10:13,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2022-11-20 20:10:13,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:10:13,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:10:13,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:10:13,742 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:10:13,742 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:10:14,660 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:10:14,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:10:16,245 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:10:16,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480594204] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:10:16,245 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:10:16,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 45 [2022-11-20 20:10:16,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855250792] [2022-11-20 20:10:16,246 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:10:16,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-20 20:10:16,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:10:16,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-20 20:10:16,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=1848, Unknown=0, NotChecked=0, Total=2070 [2022-11-20 20:10:16,247 INFO L87 Difference]: Start difference. First operand 1842 states and 6542 transitions. Second operand has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:11:01,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:11:01,842 INFO L93 Difference]: Finished difference Result 2695 states and 8787 transitions. [2022-11-20 20:11:01,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-20 20:11:01,844 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-20 20:11:01,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:11:01,856 INFO L225 Difference]: With dead ends: 2695 [2022-11-20 20:11:01,856 INFO L226 Difference]: Without dead ends: 2695 [2022-11-20 20:11:01,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2040 ImplicationChecksByTransitivity, 32.8s TimeCoverageRelationStatistics Valid=964, Invalid=6692, Unknown=0, NotChecked=0, Total=7656 [2022-11-20 20:11:01,858 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 975 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 3025 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 975 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 3324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 3025 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 256 IncrementalHoareTripleChecker+Unchecked, 18.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:11:01,858 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [975 Valid, 342 Invalid, 3324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 3025 Invalid, 0 Unknown, 256 Unchecked, 18.0s Time] [2022-11-20 20:11:01,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2695 states. [2022-11-20 20:11:01,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2695 to 1964. [2022-11-20 20:11:01,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1964 states, 1955 states have (on average 3.5764705882352943) internal successors, (6992), 1963 states have internal predecessors, (6992), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:11:01,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1964 states to 1964 states and 6992 transitions. [2022-11-20 20:11:01,901 INFO L78 Accepts]: Start accepts. Automaton has 1964 states and 6992 transitions. Word has length 15 [2022-11-20 20:11:01,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:11:01,901 INFO L495 AbstractCegarLoop]: Abstraction has 1964 states and 6992 transitions. [2022-11-20 20:11:01,901 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.7826086956521738) internal successors, (82), 45 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:11:01,902 INFO L276 IsEmpty]: Start isEmpty. Operand 1964 states and 6992 transitions. [2022-11-20 20:11:01,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:11:01,903 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:11:01,903 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:11:01,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2022-11-20 20:11:02,112 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (100)] Ended with exit code 0 [2022-11-20 20:11:02,307 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (101)] Ended with exit code 0 [2022-11-20 20:11:02,504 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:11:02,504 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:11:02,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:11:02,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1980397165, now seen corresponding path program 2 times [2022-11-20 20:11:02,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:11:02,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [610645305] [2022-11-20 20:11:02,505 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:11:02,505 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:11:02,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:11:02,506 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:11:02,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (103)] Waiting until timeout for monitored process [2022-11-20 20:11:02,816 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:11:02,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:11:02,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-20 20:11:02,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:11:02,968 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:11:02,968 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:11:03,378 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:11:03,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:11:05,103 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:11:05,103 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:11:05,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [610645305] [2022-11-20 20:11:05,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [610645305] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:11:05,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1874194181] [2022-11-20 20:11:05,107 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:11:05,107 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:11:05,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:11:05,108 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:11:05,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (104)] Waiting until timeout for monitored process [2022-11-20 20:11:05,679 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:11:05,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:11:05,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:11:05,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:11:05,815 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:11:05,815 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:11:06,469 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:11:06,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:11:07,752 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:11:07,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1874194181] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:11:07,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385967679] [2022-11-20 20:11:07,753 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 20:11:07,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:11:07,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:11:07,754 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:11:07,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2022-11-20 20:11:08,071 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 20:11:08,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:11:08,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:11:08,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:11:08,212 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:11:08,212 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:11:08,512 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:11:08,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:11:08,851 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:11:08,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385967679] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:11:08,852 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:11:08,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 32 [2022-11-20 20:11:08,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045008561] [2022-11-20 20:11:08,852 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:11:08,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-20 20:11:08,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:11:08,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-20 20:11:08,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=892, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 20:11:08,853 INFO L87 Difference]: Start difference. First operand 1964 states and 6992 transitions. Second operand has 33 states, 33 states have (on average 1.7878787878787878) internal successors, (59), 32 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:11:15,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:11:15,269 INFO L93 Difference]: Finished difference Result 2041 states and 7199 transitions. [2022-11-20 20:11:15,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-20 20:11:15,269 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7878787878787878) internal successors, (59), 32 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-20 20:11:15,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:11:15,273 INFO L225 Difference]: With dead ends: 2041 [2022-11-20 20:11:15,273 INFO L226 Difference]: Without dead ends: 2041 [2022-11-20 20:11:15,273 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=275, Invalid=1365, Unknown=0, NotChecked=0, Total=1640 [2022-11-20 20:11:15,274 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 263 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 548 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 684 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 115 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:11:15,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [263 Valid, 118 Invalid, 684 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 548 Invalid, 0 Unknown, 115 Unchecked, 3.1s Time] [2022-11-20 20:11:15,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2041 states. [2022-11-20 20:11:15,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2041 to 1964. [2022-11-20 20:11:15,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1964 states, 1955 states have (on average 3.575447570332481) internal successors, (6990), 1963 states have internal predecessors, (6990), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:11:15,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1964 states to 1964 states and 6990 transitions. [2022-11-20 20:11:15,312 INFO L78 Accepts]: Start accepts. Automaton has 1964 states and 6990 transitions. Word has length 15 [2022-11-20 20:11:15,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:11:15,313 INFO L495 AbstractCegarLoop]: Abstraction has 1964 states and 6990 transitions. [2022-11-20 20:11:15,313 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7878787878787878) internal successors, (59), 32 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:11:15,313 INFO L276 IsEmpty]: Start isEmpty. Operand 1964 states and 6990 transitions. [2022-11-20 20:11:15,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:11:15,315 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:11:15,316 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:11:15,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (103)] Forceful destruction successful, exit code 0 [2022-11-20 20:11:15,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (104)] Forceful destruction successful, exit code 0 [2022-11-20 20:11:15,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Forceful destruction successful, exit code 0 [2022-11-20 20:11:15,934 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:11:15,934 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:11:15,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:11:15,935 INFO L85 PathProgramCache]: Analyzing trace with hash 1239058863, now seen corresponding path program 3 times [2022-11-20 20:11:15,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:11:15,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [624123870] [2022-11-20 20:11:15,935 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:11:15,935 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:11:15,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:11:15,936 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:11:15,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (106)] Waiting until timeout for monitored process [2022-11-20 20:11:16,372 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 20:11:16,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:11:16,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 20:11:16,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:11:16,514 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:11:16,514 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:11:17,033 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:11:17,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:11:19,731 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:11:19,731 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:11:19,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [624123870] [2022-11-20 20:11:19,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [624123870] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:11:19,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [555570922] [2022-11-20 20:11:19,732 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:11:19,732 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:11:19,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:11:19,733 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:11:19,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (107)] Waiting until timeout for monitored process [2022-11-20 20:11:21,026 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 20:11:21,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:11:21,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-20 20:11:21,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:11:21,161 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:11:21,162 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:11:22,024 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:11:22,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:11:26,564 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:11:26,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [555570922] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:11:26,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605210432] [2022-11-20 20:11:26,564 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:11:26,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:11:26,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:11:26,565 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:11:26,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2022-11-20 20:11:27,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-20 20:11:27,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:11:27,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:11:27,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:11:27,331 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:11:27,331 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:11:28,840 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:11:28,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:11:31,622 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 20:11:31,622 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605210432] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:11:31,622 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:11:31,622 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10, 11, 10, 10] total 56 [2022-11-20 20:11:31,623 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854652624] [2022-11-20 20:11:31,623 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:11:31,623 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-20 20:11:31,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:11:31,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-20 20:11:31,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=2741, Unknown=0, NotChecked=0, Total=3192 [2022-11-20 20:11:31,624 INFO L87 Difference]: Start difference. First operand 1964 states and 6990 transitions. Second operand has 57 states, 57 states have (on average 1.4210526315789473) internal successors, (81), 56 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:12:10,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:12:10,190 INFO L93 Difference]: Finished difference Result 4972 states and 17563 transitions. [2022-11-20 20:12:10,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-20 20:12:10,191 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.4210526315789473) internal successors, (81), 56 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-20 20:12:10,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:12:10,201 INFO L225 Difference]: With dead ends: 4972 [2022-11-20 20:12:10,201 INFO L226 Difference]: Without dead ends: 4972 [2022-11-20 20:12:10,201 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2548 ImplicationChecksByTransitivity, 29.0s TimeCoverageRelationStatistics Valid=1104, Invalid=6552, Unknown=0, NotChecked=0, Total=7656 [2022-11-20 20:12:10,201 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1335 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 2405 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1335 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 3335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 2405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 867 IncrementalHoareTripleChecker+Unchecked, 20.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:12:10,202 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1335 Valid, 232 Invalid, 3335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 2405 Invalid, 0 Unknown, 867 Unchecked, 20.4s Time] [2022-11-20 20:12:10,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4972 states. [2022-11-20 20:12:10,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4972 to 2828. [2022-11-20 20:12:10,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2828 states, 2819 states have (on average 3.902802412202909) internal successors, (11002), 2827 states have internal predecessors, (11002), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:12:10,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2828 states to 2828 states and 11002 transitions. [2022-11-20 20:12:10,277 INFO L78 Accepts]: Start accepts. Automaton has 2828 states and 11002 transitions. Word has length 15 [2022-11-20 20:12:10,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:12:10,277 INFO L495 AbstractCegarLoop]: Abstraction has 2828 states and 11002 transitions. [2022-11-20 20:12:10,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.4210526315789473) internal successors, (81), 56 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:12:10,278 INFO L276 IsEmpty]: Start isEmpty. Operand 2828 states and 11002 transitions. [2022-11-20 20:12:10,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:12:10,279 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:12:10,279 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:12:10,286 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Ended with exit code 0 [2022-11-20 20:12:10,489 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (106)] Ended with exit code 0 [2022-11-20 20:12:10,685 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (107)] Ended with exit code 0 [2022-11-20 20:12:10,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt [2022-11-20 20:12:10,880 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:12:10,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:12:10,881 INFO L85 PathProgramCache]: Analyzing trace with hash 401576643, now seen corresponding path program 4 times [2022-11-20 20:12:10,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:12:10,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [999415732] [2022-11-20 20:12:10,881 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:12:10,881 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:12:10,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:12:10,882 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:12:10,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (109)] Waiting until timeout for monitored process [2022-11-20 20:12:11,195 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:12:11,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:12:11,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:12:11,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:12:11,327 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:12:11,328 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:12:11,649 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:12:11,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:12:13,038 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:12:13,038 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:12:13,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [999415732] [2022-11-20 20:12:13,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [999415732] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:12:13,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [813761829] [2022-11-20 20:12:13,039 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:12:13,039 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:12:13,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:12:13,040 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:12:13,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (110)] Waiting until timeout for monitored process [2022-11-20 20:12:13,546 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:12:13,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:12:13,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-20 20:12:13,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:12:14,380 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:12:14,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:12:15,873 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:12:15,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [813761829] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:12:15,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488253810] [2022-11-20 20:12:15,874 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:12:15,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:12:15,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:12:15,875 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:12:15,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2022-11-20 20:12:16,182 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:12:16,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:12:16,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:12:16,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:12:16,761 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:12:16,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:12:16,869 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:12:16,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488253810] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:12:16,870 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:12:16,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 11, 11, 11, 11] total 41 [2022-11-20 20:12:16,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630143438] [2022-11-20 20:12:16,870 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:12:16,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-20 20:12:16,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:12:16,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-20 20:12:16,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2022-11-20 20:12:16,871 INFO L87 Difference]: Start difference. First operand 2828 states and 11002 transitions. Second operand has 43 states, 42 states have (on average 1.4285714285714286) internal successors, (60), 42 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:12:46,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:12:46,137 INFO L93 Difference]: Finished difference Result 4481 states and 15098 transitions. [2022-11-20 20:12:46,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-20 20:12:46,139 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.4285714285714286) internal successors, (60), 42 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-20 20:12:46,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:12:46,148 INFO L225 Difference]: With dead ends: 4481 [2022-11-20 20:12:46,148 INFO L226 Difference]: Without dead ends: 4481 [2022-11-20 20:12:46,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2633 ImplicationChecksByTransitivity, 20.8s TimeCoverageRelationStatistics Valid=1629, Invalid=7491, Unknown=0, NotChecked=0, Total=9120 [2022-11-20 20:12:46,149 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 3200 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 4908 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3200 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 5028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 4908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.9s IncrementalHoareTripleChecker+Time [2022-11-20 20:12:46,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3200 Valid, 434 Invalid, 5028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 4908 Invalid, 0 Unknown, 0 Unchecked, 11.9s Time] [2022-11-20 20:12:46,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4481 states. [2022-11-20 20:12:46,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4481 to 2382. [2022-11-20 20:12:46,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2382 states, 2373 states have (on average 3.708386009270965) internal successors, (8800), 2381 states have internal predecessors, (8800), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:12:46,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2382 states to 2382 states and 8800 transitions. [2022-11-20 20:12:46,226 INFO L78 Accepts]: Start accepts. Automaton has 2382 states and 8800 transitions. Word has length 15 [2022-11-20 20:12:46,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:12:46,227 INFO L495 AbstractCegarLoop]: Abstraction has 2382 states and 8800 transitions. [2022-11-20 20:12:46,227 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.4285714285714286) internal successors, (60), 42 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:12:46,227 INFO L276 IsEmpty]: Start isEmpty. Operand 2382 states and 8800 transitions. [2022-11-20 20:12:46,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-20 20:12:46,230 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:12:46,230 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:12:46,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (109)] Forceful destruction successful, exit code 0 [2022-11-20 20:12:46,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (110)] Ended with exit code 0 [2022-11-20 20:12:46,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Forceful destruction successful, exit code 0 [2022-11-20 20:12:46,843 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:12:46,844 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:12:46,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:12:46,844 INFO L85 PathProgramCache]: Analyzing trace with hash 1942109264, now seen corresponding path program 1 times [2022-11-20 20:12:46,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:12:46,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1522584772] [2022-11-20 20:12:46,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:12:46,845 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:12:46,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:12:46,846 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:12:46,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (112)] Waiting until timeout for monitored process [2022-11-20 20:12:47,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:12:47,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 20:12:47,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:12:47,220 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:12:47,220 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:12:47,220 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:12:47,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1522584772] [2022-11-20 20:12:47,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1522584772] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:12:47,220 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:12:47,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:12:47,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279687213] [2022-11-20 20:12:47,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:12:47,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:12:47,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:12:47,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:12:47,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:12:47,222 INFO L87 Difference]: Start difference. First operand 2382 states and 8800 transitions. Second operand has 4 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:12:47,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:12:47,371 INFO L93 Difference]: Finished difference Result 2353 states and 8724 transitions. [2022-11-20 20:12:47,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 20:12:47,372 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-20 20:12:47,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:12:47,380 INFO L225 Difference]: With dead ends: 2353 [2022-11-20 20:12:47,380 INFO L226 Difference]: Without dead ends: 2353 [2022-11-20 20:12:47,382 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:12:47,386 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 31 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:12:47,387 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 2 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:12:47,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2353 states. [2022-11-20 20:12:47,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2353 to 2353. [2022-11-20 20:12:47,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2353 states, 2348 states have (on average 3.7155025553662693) internal successors, (8724), 2352 states have internal predecessors, (8724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:12:47,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2353 states to 2353 states and 8724 transitions. [2022-11-20 20:12:47,483 INFO L78 Accepts]: Start accepts. Automaton has 2353 states and 8724 transitions. Word has length 19 [2022-11-20 20:12:47,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:12:47,484 INFO L495 AbstractCegarLoop]: Abstraction has 2353 states and 8724 transitions. [2022-11-20 20:12:47,484 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:12:47,484 INFO L276 IsEmpty]: Start isEmpty. Operand 2353 states and 8724 transitions. [2022-11-20 20:12:47,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-20 20:12:47,488 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:12:47,488 INFO L195 NwaCegarLoop]: trace histogram [10, 5, 1, 1, 1, 1, 1] [2022-11-20 20:12:47,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (112)] Forceful destruction successful, exit code 0 [2022-11-20 20:12:47,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:12:47,701 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 36 more)] === [2022-11-20 20:12:47,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:12:47,702 INFO L85 PathProgramCache]: Analyzing trace with hash -1060461155, now seen corresponding path program 5 times [2022-11-20 20:12:47,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2022-11-20 20:12:47,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [998790193] [2022-11-20 20:12:47,702 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-20 20:12:47,702 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2022-11-20 20:12:47,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat [2022-11-20 20:12:47,703 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-11-20 20:12:47,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2022-11-20 20:12:48,176 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2022-11-20 20:12:48,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:12:48,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-20 20:12:48,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:12:48,326 INFO L321 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2022-11-20 20:12:48,326 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 44 [2022-11-20 20:12:49,196 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 24 proven. 43 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:12:49,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:12:53,848 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:12:53,848 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2022-11-20 20:12:53,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [998790193] [2022-11-20 20:12:53,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleMathsat [998790193] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:12:53,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1356727564] [2022-11-20 20:12:53,848 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-20 20:12:53,848 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-11-20 20:12:53,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 [2022-11-20 20:12:53,849 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-11-20 20:12:53,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2022-11-20 20:12:54,958 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2022-11-20 20:12:54,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:12:54,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 20:12:54,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:12:56,969 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 30 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:12:56,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:13:00,052 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 30 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:13:00,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1356727564] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:13:00,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469739909] [2022-11-20 20:13:00,052 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-11-20 20:13:00,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:13:00,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:13:00,053 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:13:00,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd59d9a1-f073-489e-b851-10ced61ff555/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2022-11-20 20:13:01,770 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2022-11-20 20:13:01,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:13:01,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:13:01,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:13:04,207 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 30 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:13:04,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:13:06,255 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 30 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-20 20:13:06,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [469739909] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:13:06,255 INFO L184 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2022-11-20 20:13:06,256 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 14, 14, 14, 14] total 78 [2022-11-20 20:13:06,256 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468712252] [2022-11-20 20:13:06,256 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2022-11-20 20:13:06,256 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-20 20:13:06,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2022-11-20 20:13:06,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-20 20:13:06,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=581, Invalid=5581, Unknown=0, NotChecked=0, Total=6162 [2022-11-20 20:13:06,257 INFO L87 Difference]: Start difference. First operand 2353 states and 8724 transitions. Second operand has 79 states, 79 states have (on average 1.139240506329114) internal successors, (90), 78 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)