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newruntime: error when modifying a sequence #11524

bpr opened this issue Jun 17, 2019 · 1 comment


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commented Jun 17, 2019

proc creates a new sequence, modifies the first value, and then prints it. When compiled with newruntime modifying the value crashes it.


proc main() =
  var a = @[1,2,3]
  a[0] = 4
  echo "a: ", a

when isMainModule:

Current Output when compiled with nim c --newruntime

Traceback (most recent call last)
/Users/bpr/src/nim/nim-examples/nr_bug00.nim(7) nr_bug00
/Users/bpr/src/nim/nim-examples/nr_bug00.nim(3) main
SIGBUS: Illegal storage access. (Attempt to read from nil?)

Expected Output compiled with nim c -d:danger

a: @[4, 2, 3]

Additional Information

$ nim -v
Nim Compiler Version 0.20.99 [MacOSX: amd64]
Compiled at 2019-06-17
Copyright (c) 2006-2019 by Andreas Rumpf

git hash: c8268330be4de61541aa34eb82f7a93dc62e627c
active boot switches: -d:release

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commented Jun 19, 2019

Reason: We move the const sequence into a which then points to a readonly data section.

@Araq Araq closed this in 79c721d Jun 21, 2019

narimiran added a commit that referenced this issue Jun 27, 2019

[bugfix] fixes #11524
(cherry picked from commit 79c721d)
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