[Pkg-haskell-maintainers] Bug#786727: crashes with segfault when drawLineH is called

[Joey Hess]

John Millikin wrote:
> I've not been able to reproduce this on my workstation, which is running
> Jessie. Installed package versions:
> 
> ghc: [7.6.3, 7.8.4, 7.10.1]
> c2hs: [0.17.2]
> haskell-ncurses: [0.2.7, 0.2.11]
> libncursesw5-dev: [5.9+20140913-1+b1]
> 
> That stack trace posted in the OP is suspicious. It looks like drawBorder is
> being called somehow, but there is no path for the posted code snippet to reach
> drawBorder. This makes me believe the stack is getting corrupted.
> 
> The only change between 0.2.7 and 0.2.11 that seems related is
> 08137f194f66796a68bf38886d3944caf7b9d08e, which added support for c2hs>=0.18.2
> by adding ifdefs for some new pointer semantics. I believe this change is
> semantically a no-op, but there might be something going on in the FFI code
> that I'm not aware of.
> 
> What version of c2hs are you using? I'll try building with that to see if it
> triggers the issue for me.

c2hs is 0.25.2

I'll bet that if you debootstrap a chroot of debian unstable, you'll be
able to reproduce it in there.

Adding to the stack-smashing hypothesis, I got this backtrace just now:

#0  __memcpy_sse2_unaligned ()
    at ../sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S:33
#1  0x0000000000415ede in ckTj_info ()
#2  0x0000000000000000 in ?? ()

-- 
see shy jo
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 811 bytes
Desc: Digital signature
URL: <http://lists.alioth.debian.org/pipermail/pkg-haskell-maintainers/attachments/20150605/9553ab62/attachment.sig>