From: Garrick Staples <garrick@usc.edu>
Subject: Re: mountd segfault on itanium2
Date: Fri, 30 Apr 2004 20:07:30 -0700
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Message-ID: <20040501030730.GE23287@polop.usc.edu>
References: <20040430212414.GF22498@polop.usc.edu> <20040430234327.GM22498@polop.usc.edu>
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On Fri, Apr 30, 2004 at 04:43:27PM -0700, Garrick Staples alleged:
> I just spotted a pattern.  After collecting several strace samples, it al=
ways
> segfaults after read() or write() to fd 5.  And fd 5 is always:
>=20
>    open("/proc/net/rpc/nfsd.fh/channel", O_RDWR) =3D 5

I have an ugly work-around that seems to be working.  It seems that 2.6 has=
 a
new nfs interface for userspace.  By forcing mountd to use the older 2.4
interface, it doesn't segfault anymore.  So something in the new code paths=
 is
broken.

In support/nfs/cachio.c:
int
check_new_cache(void)
{
        struct stat stb;

        return 0;  /* DISABLE NEW 2.6 INTERFACE */

        return  (stat("/proc/fs/nfs/filehandle", &stb) =3D=3D 0) ||
                (stat("/proc/fs/nfsd/filehandle", &stb) =3D=3D 0);
}

Am I losing any functionality by doing this?  I can't actually find any
problems.

--=20
Garrick Staples, Linux/HPCC Administrator
University of Southern California

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