GNU bug report logs - #24908
Possible unboxing bug in master triggered by (format)

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Daniel Llorens <daniel.llorens <at> bluewin.ch>
Subject: bug#24908: closed (bug#24908: closing)
Date: Thu, 15 Dec 2016 12:00:03 +0000

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Your bug report

#24908: Possible unboxing bug in master triggered by (format)

which was filed against the guile package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 24908 <at> debbugs.gnu.org.

-- 
24908: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24908
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Daniel Llorens <daniel.llorens <at> bluewin.ch>
To: 24908-close <at> debbugs.gnu.org
Subject: bug#24908: closing
Date: Thu, 15 Dec 2016 12:59:44 +0100

Fixed in 2660c0b3c86bf76fab465c200a5ca20fb37cf811.

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From: Daniel Llorens <daniel.llorens <at> bluewin.ch>
To: bug-guile <at> gnu.org
Subject: Possible unboxing bug in master triggered by (format)
Date: Wed, 9 Nov 2016 14:17:04 +0100

(format #f "~2f" 9.9) fails in master. You can try different combinations, it doesn't fail when it rounds down or there're more spaces for example.

The first bad commit is 0f2f5949a21572fad8355473200c7adc6d74f882 'Better unboxing' on the master branch.

See the full error below. 18446744073709551615 is 2^64-1 of course so it looks like bad signedness somewhere.

Regards

	Daniel


> guile -c '(use-modules (ice-9 format)) (format #f "~2f" 9.9)'
Backtrace:./meta/guile -c '(use-modules (ice-9 format)) (format #f "~2f" 9.9)'
Backtrace:
           8 (apply-smob/1 #<catch-closure 1105c20>)
In ice-9/boot-9.scm:
    704:2  7 (call-with-prompt ("prompt") #<procedure 110a060 at ic…> …)
In ice-9/eval.scm:
    608:8  6 (_ #(#(#<directory (guile-user) 110cf30>)))
In ice-9/command-line.scm:
   181:18  5 (_ #<input: string 1119f50>)
In unknown file:
           4 (eval (format #f "~2f" 9.9) #<directory (guile-user) 11…>)
In ice-9/format.scm:
  1590:19  3 (format #f "~2f" 9.9)
   316:19  2 (format:format-work "~2f" (9.9))
  1142:30  1 (format:out-fixed #f _ _)
  1525:37  0 (format:fn-round _)

ice-9/format.scm:1525:37: In procedure format:fn-round:
ice-9/format.scm:1525:37: In procedure string-ref: Value out of range: 18446744073709551615

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