bug#29826: nondeterministic Broken pipe

[Alex Vong]

Hello,

I get the following error when running ``guix --version | head -n 1''. I
can get similar after replacing ``--version'' with ``--help''. Also, the
error is nondeterministic. Any idea?


$ LC_ALL=C guix --version | head -n 1
guix (GNU Guix) 91213c384b62bc422896d39005efa922e4fa75f2
Backtrace:
In ice-9/boot-9.scm:
 160: 14 [catch #t #<catch-closure 5628460c6140> ...]
In unknown file:
   ?: 13 [apply-smob/1 #<catch-closure 5628460c6140>]
In ice-9/boot-9.scm:
  66: 12 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 11 [eval # #]
In ice-9/boot-9.scm:
2404: 10 [save-module-excursion #<procedure 5628460e8900 at 
ice-9/boot-9.scm:4051:3 ()>]
4056: 9 [#<procedure 5628460e8900 at ice-9/boot-9.scm:4051:3 ()>]
1727: 8 [%start-stack load-stack ...]
1732: 7 [#<procedure 5628460fdb40 ()>]
In unknown file:
   ?: 6 [primitive-load "/usr/local/bin/guix"]
In guix/ui.scm:
 390: 5 [show-version-and-exit "guix"]
In ice-9/format.scm:
1593: 4 [format #t "Copyright ~a 2017 ~a" "(C)" "the Guix authors\n"]
 766: 3 [format:format-work "Copyright ~a 2017 ~a" ("(C)" "the Guix authors\n")]
 264: 2 [tilde-dispatch]
  73: 1 [format:out-obj-padded #f "the Guix authors\n" #f ()]
In unknown file:
   ?: 0 [display "the Guix authors\n" #<output: file 1>]

ERROR: In procedure display:
ERROR: In procedure scm_flush: Broken pipe
Backtrace:
In ice-9/boot-9.scm:
 160: 1 [catch #t #<catch-closure 562846cd3020> ...]
In unknown file:
   ?: 0 [apply-smob/1 #<catch-closure 562846cd3020>]

ERROR: In procedure apply-smob/1:
ERROR: In procedure scm_flush: Broken pipe


Cheers,
Alex

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