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  1. Core Server
  2. SERVER-73805

mongos in 6.0.4 hangs under load

    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Minor - P4 Minor - P4
    • None
    • Affects Version/s: 6.0.4
    • Component/s: None
    • Labels:
      None
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      start mongos, wait for a while during very busy times..

       

      Show
      start mongos, wait for a while during very busy times..  

      Environment:

      • Ubuntu 22.04 latest patches
      • 128GB ram machine, AMD Epic, as well as Intel machines

      We just upgraded from 5.0.14 to 6.0.4. The upgrade went smoothly last night. Today during peak hours, our app servers that were getting most of our traffic would have mongos randomly hang.    The mongos process looks like it is still running,  however mongosh cannot connect to it.  

       

      I managed to attached gdb to the running process, and here is the backtrace:

      gdb --pid=458174
      GNU gdb (Ubuntu 12.1-0ubuntu1~22.04) 12.1
      Copyright (C) 2022 Free Software Foundation, Inc.
      License GPLv3+: GNU GPL version 3 or later <[http://gnu.org/licenses/gpl.html]>
      This is free software: you are free to change and redistribute it.
      There is NO WARRANTY, to the extent permitted by law.
      Type "show copying" and "show warranty" for details.
      This GDB was configured as "x86_64-linux-gnu".
      Type "show configuration" for configuration details.
      For bug reporting instructions, please see:
      <[https://www.gnu.org/software/gdb/bugs/]>.
      Find the GDB manual and other documentation resources online at:
          <[http://www.gnu.org/software/gdb/documentation/]>.
      
      For help, type "help".
      Type "apropos word" to search for commands related to "word".
      Attaching to process 458174
      [New LWP 458175]
      [New LWP 458176]
      [New LWP 458177]
      [New LWP 458178]
      [New LWP 458179]
      [New LWP 458181]
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      [New LWP 458184]
      [New LWP 458186]
      [New LWP 458187]
      [New LWP 458188]
      [New LWP 458194]
      [New LWP 458196]
      [New LWP 458197]
      [New LWP 458199]
      [New LWP 458200]
      [New LWP 458201]
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      [New LWP 458204]
      [New LWP 458205]
      [New LWP 458206]
      [New LWP 458207]
      [New LWP 458208]
      [New LWP 458209]
      [New LWP 458211]
      [New LWP 458212]
      [New LWP 458213]
      [New LWP 458214]
      [New LWP 458215]
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      [New LWP 458218]
      [New LWP 458219]
      [New LWP 458220]
      [New LWP 458221]
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      [New LWP 458224]
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      [New LWP 458226]
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      [New LWP 458229]
      [New LWP 458230]
      [New LWP 458231]
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      [New LWP 458236]
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      [New LWP 458241]
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      [New LWP 458251]
      [New LWP 458252]
      [New LWP 458275]
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      [New LWP 458285]
      [New LWP 458286]
      [New LWP 458287]
      [New LWP 458288]
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      [New LWP 458299]
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      [New LWP 458310]
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      [New LWP 458410]
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      [New LWP 458480]
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      [New LWP 458483]
      [New LWP 458484]
      [New LWP 458485]
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      [New LWP 458510]
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      [New LWP 458565]
      [New LWP 458566]
      [New LWP 458567]
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      [New LWP 458570]
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      [New LWP 458573]
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      [New LWP 458575]
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      [New LWP 458578]
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      [New LWP 458585]
      [New LWP 458586]
      [New LWP 458587]
      [New LWP 458588]
      [New LWP 458589]
      [New LWP 458619]
      [New LWP 458620]
      [New LWP 458621]
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      [New LWP 458623]
      [New LWP 458624]
      [New LWP 458625]
      [New LWP 458626]
      [New LWP 458627]
      [New LWP 458628]
      [New LWP 458629]
      [New LWP 458630]
      [New LWP 458631]
      [New LWP 458632]
      [New LWP 458633]
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      [New LWP 458635]
      [New LWP 458636]
      [New LWP 458637]
      [New LWP 458638]
      [New LWP 458639]
      [New LWP 458640]
      [New LWP 458641]
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      [New LWP 458646]
      [New LWP 458647]
      [New LWP 458648]
      [New LWP 458649]
      [New LWP 458654]
      [New LWP 458669]
      [New LWP 458676]
      [New LWP 458685]
      [New LWP 458704]
      [New LWP 458705]
      [New LWP 458706]
      [New LWP 458717]
      [New LWP 458729]
      [New LWP 458765]
      [New LWP 458766]
      [New LWP 458767]
      [New LWP 458768]
      [New LWP 458769]
      [New LWP 458770]
      [New LWP 458771]
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      [New LWP 458773]
      [New LWP 458774]
      [New LWP 458775]
      [New LWP 458776]
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      [New LWP 458778]
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      [New LWP 458780]
      [New LWP 458783]
      [New LWP 458784]
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      [New LWP 458787]
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      [New LWP 458799]
      [New LWP 458800]
      [New LWP 458801]
      [New LWP 458802]
      [New LWP 458803]
      [New LWP 458804]
      [New LWP 458805]
      [New LWP 458806]
      [New LWP 458807]
      [New LWP 458816]
      [New LWP 460155]
      [New LWP 460156]
      [New LWP 460157]
      [New LWP 460158]
      [New LWP 460159]
      [New LWP 460160]
      [New LWP 460161]
      [New LWP 460162]
      [New LWP 460179]
      [New LWP 460902]
      [Thread debugging using libthread_db enabled]
      Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
      __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55a549d8c668 <mongo::(anonymous namespace)::shutdownTasksComplete+40>) at ./nptl/futex-internal.c:57
      57    ./nptl/futex-internal.c: No such file or directory.
      (gdb) bt
      #0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0,
          futex_word=0x55a549d8c668 <mongo::(anonymous namespace)::shutdownTasksComplete+40>) at ./nptl/futex-internal.c:57
      #1  __futex_abstimed_wait_common (cancel=true, private=0, abstime=0x0, clockid=0, expected=0,
          futex_word=0x55a549d8c668 <mongo::(anonymous namespace)::shutdownTasksComplete+40>) at ./nptl/futex-internal.c:87
      #2  _{_}GI{_}__futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55a549d8c668 <mongo::(anonymous namespace)::shutdownTasksComplete+40>,
          expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at ./nptl/futex-internal.c:139
      #3  0x00007fd183046ac1 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55a54bb04d10,
          cond=0x55a549d8c640 <mongo::(anonymous namespace)::shutdownTasksComplete>) at ./nptl/pthread_cond_wait.c:503
      #4  ___pthread_cond_wait (cond=0x55a549d8c640 <mongo::(anonymous namespace)::shutdownTasksComplete>, mutex=0x55a54bb04d10) at ./nptl/pthread_cond_wait.c:627
      #5  0x000055a548c6ac4c in std::condition_variable::wait(std::unique_lock<std::mutex>&) ()
      #6  0x000055a548abc487 in mongo::waitForShutdown() ()
      #7  0x000055a546cd1939 in mongo::mongos_main(int, char**) ()
      #8  0x000055a546b80bfc in main ()
      

       

            Assignee:
            yuan.fang@mongodb.com Yuan Fang
            Reporter:
            amit.gupta@opensense.com Amit Gupta
            Votes:
            0 Vote for this issue
            Watchers:
            5 Start watching this issue

              Created:
              Updated:
              Resolved: