Bug#715212: incompatability with 2.6.32; eventfd() fails with "Function not implemented"

[Aurelien Jarno <aurelien@aurel32.net>]

On Sat, Jul 06, 2013 at 10:43:11PM -0400, Joey Hess wrote:
> Package: libc6
> Version: 2.17-7
> Severity: important
> 
> On a system with kernel 2.6.32 (forced by a hosting provider) and this
> libc6, any calls to eventfd() fail. This causes at least all nontrivial
> haskell programs to fail to run, since ghc uses eventfd in its
> runtime system when performing IO.
> 
> Here is an upstream bug report in ghc about this problem:
> http://ghc.haskell.org/trac/ghc/ticket/7926
> (According to the comments there, wheezy is also affected.)
> 
> Here is a report of this problem breaking git-annex:
> http://git-annex.branchable.com/bugs/hGetContents:_user_error/
> 
> Here is a simple test program I used to verify this problem is not specific to
> ghc:
> 
> #include <sys/eventfd.h>
> #include <errno.h>
> 
> main () {
>         int i;
>         i = eventfd(10, 0);
>         if (i == -1) {
>                 perror("err");
>         }
>         else {
>                 printf("hello, world\n");
>         }
> }

I am unable to reproduce the problem on a Debian 2.6.32-5 kernel. Could
it be that the kernel that you are using does not have CONFIG_EVENTFD
enabled? An strace of this test program could help to understand the
problem.

-- 
Aurelien Jarno	                        GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net