Re: #16201: ghci063 failing on Darwin
"GHC" <[email protected]>
| Newsgroups | gmane.comp.lang.haskell.glasgow.bugs |
|---|---|
| Message-ID | <[email protected]> |
#16201: ghci063 failing on Darwin
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Reporter: bgamari | Owner: (none)
Type: bug | Status: new
Priority: highest | Milestone: 8.8.1
Component: Compiler | Version: 8.6.3
Resolution: | Keywords: ci-breakage
Operating System: MacOS X | Architecture: Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by int-index):
I figured it out, `touch -r` leads to precision loss:
{{{
ghc(master)*$ echo "" > file
ghc(master)*$ /nix/store/acnfbicd84bnya2l2dq868b5l482qihw-
coreutils-8.30/bin/stat file
File: file
Size: 1 Blocks: 8 IO Block: 4096 regular file
Device: 1000004h/16777220d Inode: 14905419 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 501/int-index) Gid: ( 20/ staff)
Access: 2019-02-25 01:11:23.807505116 +0300
Modify: 2019-02-25 01:11:23.807627350 +0300
Change: 2019-02-25 01:11:23.807627350 +0300
Birth: 2019-02-25 01:11:23.807505116 +0300
ghc(master)*$ touch -r file file
ghc(master)*$ /nix/store/acnfbicd84bnya2l2dq868b5l482qihw-
coreutils-8.30/bin/stat file
File: file
Size: 1 Blocks: 8 IO Block: 4096 regular file
Device: 1000004h/16777220d Inode: 14905419 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 501/int-index) Gid: ( 20/ staff)
Access: 2019-02-25 01:11:23.807505000 +0300
Modify: 2019-02-25 01:11:23.807627000 +0300
Change: 2019-02-25 01:11:39.159813166 +0300
Birth: 2019-02-25 01:11:23.807505116 +0300
}}}
The test passes nondeterministically when the last three digits are zero
even before `touch`, I think. I was lucky to observe this locally after
only a few runs, otherwise I would probably not even attempt to debug
this!
The solution is to do `touch -r B.hs B.hs` to nullify the digits before we
run other `touch -r` commands.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16201#comment:4>