[GHC] #14433: Windows10 GHCI Crash, it can't run correctly

[GHC]

#14433: Windows10 GHCI Crash, it can't run correctly
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        Reporter:  Shizumi        |                Owner:  (none)
            Type:  bug            |               Status:  closed
        Priority:  normal         |            Milestone:  8.4.1
       Component:  GHCi           |              Version:  8.2.1
      Resolution:  duplicate      |             Keywords:
Operating System:  Windows        |         Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |            Test Case:
      Blocked By:                 |             Blocking:
 Related Tickets:  #14168 #14398  |  Differential Rev(s):
       Wiki Page:                 |
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Changes (by Phyx-):

 * status:  new => closed
 * resolution:   => duplicate
 * related:   => #14168 #14398


Comment:

 Let's continue this at #14398.

 This is locale related, it's having trouble converting char to a widechar,
 and seems to have some issues under what looks like a Chinese locale.

 8.0 works because it doesn't have support for import libraries, so it
 doesn't have this call.

 The function that fails is `mbstowcs` and the documentation states: `If
 mbstowcs encounters an invalid multibyte character, it returns –1`

 So something is corrupting the path. This corruption was either introduced
 in 8.2 or always existed but we never knew it because the paths weren't
 being validated.

 Judging from #14168 which seems to indicate that there's some path
 corruption long before it hits the rts.

 Shizumi, can you as well try the steps in
 https://ghc.haskell.org/trac/ghc/ticket/14398#comment:3

 there's a big possibility that 8.4 fixes the memory corruption by an
 unrelated commit, which is why it's working. but without the path I can't
 figure it out.. I'll have to make a special build of 8.2 with the
 aggressive error handlers turned off for the monitor to work.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14433#comment:3>
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