Parse failure

[ndmitchell]

The attached file gives the error endOfInput

main.zip

[maoe]

Thanks for reporting. The profiling report seems to be broken at the line 802 and 803:

        fromGroup                 System.Console.CmdArgs.Explicit.Type         System\Console\CmdArgs\Explicit\Type.hs:60:1-51                5988          3    0.0    0.0     0.0    0.0      0       448
        modeGroupModes            System.Console.CmdArgs.Explicit.Type         System\Console\CmdArgs\Explicit\Type.hs:82:6-19                5985          3    0.0    0.0     0.0    0.0      0         0
sole\CmdArgs\Explicit\Type.hs:82:6-19                5991          3    0.0    0.0     0.0    0.0      0         0
eneral.Util                                 src\General\Util.hs:360:1-61                                   6201          0    0.0    0.0     0.0    0.0      0       112
 CAF:lvl32_r2mdh                                  General.Store                                <no location info>                                             3306          0    0.0    0.0     0.0    0.0      0         0
  verString                                       General.Store                                src\General\Store.hs:41:1-94                                   6198          0    0.0    0.0     0.0    0.0      0       680

Maybe it's a bug in GHC RTS?

[ndmitchell]

Quite possibly - but it was remarkably persistent with GHC 8.6.3 on Windows running Hoogle. I think I got 10 corrupt profiles in a row.

[maoe]

#12 seems to be the same issue.

Do you get the same issue with other GHC versions? I think it's time to file a ticket upstream.

Unfortunately I don't think there's a good way to workaround this issue in ghc-prof. The missing parts (cost center names and module names) are crucial to reconstruct the cost center stack. Would it be better if the library failed with a descriptive error message?

[ndmitchell]

The ticket #12 was about 8.2.2 - seems like a persistent bug to me, happening across multiple versions. I was using -N as well. Sounds like something that might be the culprit.

[ndmitchell]

I think preparing a ticket for upstream GHC would be very valuable.