JoinHandle polled after completion

[lifeRobot]

Version
tokio 1.36.0

Platform
Windows Server2012 R2
Windows 11

Description
I don't know which part of the code is problematic, but my program is experiencing panic!

error msg

thread 'tokio-runtime-worker' panicked at C:\Users\admin\.cargo\registry\src\ind
ex.crates.io-6f17d22bba15001f\tokio-1.36.0\src\runtime\task\core.rs:375:22:
JoinHandle polled after completion
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'tokio-runtime-worker' panicked at C:\Users\admin\.cargo\registry\src\ind
ex.crates.io-6f17d22bba15001f\tokio-1.36.0\src\runtime\task\state.rs:461:9:
assertion failed: prev.ref_count() >= 1
stack backtrace:
   0:     0x7ff764f82e92 - <unknown>
   1:     0x7ff764f9e2dd - <unknown>
   2:     0x7ff764f7f2a1 - <unknown>
   3:     0x7ff764f82cba - <unknown>
   4:     0x7ff764f84f09 - <unknown>
   5:     0x7ff764f84bc5 - <unknown>
   6:     0x7ff764f85434 - <unknown>
   7:     0x7ff764f852cb - <unknown>
   8:     0x7ff764f83539 - <unknown>
   9:     0x7ff764f84fd2 - <unknown>
  10:     0x7ff7651c61d7 - <unknown>
  11:     0x7ff7651c62b2 - <unknown>
  12:     0x7ff764eeada2 - <unknown>
  13:     0x7ff76477caeb - <unknown>
  14:     0x7ff7647812cd - <unknown>
  15:     0x7ff76494d27b - <unknown>
  16:     0x7ff764f0fb77 - <unknown>
  17:     0x7ff764eea03c - <unknown>
  18:     0x7ff764ed25ce - <unknown>
  19:     0x7ff764e833a1 - <unknown>
  20:     0x7fffe9bf1030 - <unknown>
  21:     0x7fffe9bf4a52 - is_exception_typeof
  22:     0x7fffe9bfe7f4 - _C_specific_handler
  23:     0x7fffe9bf3cc8 - is_exception_typeof
  24:     0x7fffe9bff131 - _CxxFrameHandler3
  25:     0x7ffff7b52fbd - _chkstk
  26:     0x7ffff7b150ec - RtlUnwindEx
  27:     0x7fffe9bfecbe - _C_specific_handler
  28:     0x7fffe9bf2955 - is_exception_typeof
  29:     0x7fffe9bf2d81 - is_exception_typeof
  30:     0x7fffe9bf3dc4 - is_exception_typeof
  31:     0x7fffe9bff131 - _CxxFrameHandler3
  32:     0x7ffff7b52f3d - _chkstk
  33:     0x7ffff7b14557 - RtlRaiseException
  34:     0x7ffff7b1377d - RtlRaiseException
  35:     0x7ffff4f4873c - RaiseException
  36:     0x7fffe9bf6220 - CxxThrowException
  37:     0x7ff764f8c5de - <unknown>
  38:     0x7ff764f85799 - <unknown>
  39:     0x7ff764f8549d - <unknown>
  40:     0x7ff764f852cb - <unknown>
  41:     0x7ff764f83539 - <unknown>
  42:     0x7ff764f84fd2 - <unknown>
  43:     0x7ff7651c61d7 - <unknown>
  44:     0x7ff7648ca8b4 - <unknown>
  45:     0x7ff7648c6732 - <unknown>
  46:     0x7ff76477eb54 - <unknown>
  47:     0x7ff76494b06e - <unknown>
  48:     0x7ff764f0fb45 - <unknown>
  49:     0x7ff764e828aa - <unknown>
  50:     0x7ff764e82b89 - <unknown>
  51:     0x7ff764e81c5d - <unknown>
  52:     0x7ff764e81a58 - <unknown>
  53:     0x7ff764e853ff - <unknown>
  54:     0x7ff764e7f2b3 - <unknown>
  55:     0x7ff764e878f6 - <unknown>
  56:     0x7ff764e89b13 - <unknown>
  57:     0x7ff764e871bb - <unknown>
  58:     0x7ff764e7f4eb - <unknown>
  59:     0x7ff764e84f36 - <unknown>
  60:     0x7ff764e857e6 - <unknown>
  61:     0x7ff764e85cd3 - <unknown>
  62:     0x7ff764e8494b - <unknown>
  63:     0x7ff764f0fa96 - <unknown>
  64:     0x7ff764f11e82 - <unknown>
  65:     0x7ff764f020da - <unknown>
  66:     0x7ff764f01eb4 - <unknown>
  67:     0x7ff764f01825 - <unknown>
  68:     0x7ff764f01525 - <unknown>
  69:     0x7ff764f3976b - <unknown>
  70:     0x7ff764f08cb6 - <unknown>
  71:     0x7ff764f27d72 - <unknown>
  72:     0x7ff764f26b0e - <unknown>
  73:     0x7ff764f08c73 - <unknown>
  74:     0x7ff764f013e1 - <unknown>
  75:     0x7ff764ef6382 - <unknown>
  76:     0x7ff764f011ac - <unknown>
  77:     0x7ff764f0109e - <unknown>
  78:     0x7ff764f04feb - <unknown>
  79:     0x7ff764f240db - <unknown>
  80:     0x7ff764f23fc8 - <unknown>
  81:     0x7ff764f263df - <unknown>
  82:     0x7ff764f16ad3 - <unknown>
  83:     0x7ff764f3be96 - <unknown>
  84:     0x7ff764f3ca93 - <unknown>
  85:     0x7ff764f3ba5b - <unknown>
  86:     0x7ff764edbfdb - <unknown>
  87:     0x7ff764f26236 - <unknown>
  88:     0x7ff764f25766 - <unknown>
  89:     0x7ff764f25653 - <unknown>
  90:     0x7ff764f0fd1b - <unknown>
  91:     0x7ff764f0fa96 - <unknown>
  92:     0x7ff764f11f38 - <unknown>
  93:     0x7ff764f12325 - <unknown>
  94:     0x7ff764f13ff6 - <unknown>
  95:     0x7ff764f13d91 - <unknown>
  96:     0x7ff764eccbd9 - <unknown>
  97:     0x7ff764f29861 - <unknown>
  98:     0x7ff764f16a91 - <unknown>
  99:     0x7ff764f3bfa5 - <unknown>
 100:     0x7ff764f3ca93 - <unknown>
 101:     0x7ff764f3b724 - <unknown>
 102:     0x7ff764f29684 - <unknown>
 103:     0x7ff764ecd6de - <unknown>
 104:     0x7ff764f89dbc - <unknown>
 105:     0x7ffff5381412 - BaseThreadInitThunk
 106:     0x7ffff7ad5504 - RtlUserThreadStart

[Darksonn]

The panic message "JoinHandle polled after completion" means that you tried to use a JoinHandle after you already got the value from it.

This can happen when used together with tokio::select! in a loop, where the JoinHandle triggers, and then afterwards, the tokio::select! tries to wait on the JoinHandle again.

[Darksonn]

Closing because the panic message reveals an issue in your code. It's not an issue in Tokio.

[Darksonn]

Actually, this also has the assertion failed: prev.ref_count() >= 1 panic.

[Darksonn]

Please move discussion to #6424.

[Noah-Kennedy]

@lifeRobot please hop over to the new issue if you can, we are looking for more information from folks to try and narrow down what it might be.