From: Garrick Staples <garrick@usc.edu>
Subject: Re: mountd segfault on itanium2
Date: Mon, 3 May 2004 11:24:01 -0700
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Message-ID: <20040503182401.GP23287@polop.usc.edu>
References: <20040430212414.GF22498@polop.usc.edu> <20040430234327.GM22498@polop.usc.edu> <20040501030730.GE23287@polop.usc.edu>
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On Fri, Apr 30, 2004 at 08:07:30PM -0700, Garrick Staples alleged:
> On Fri, Apr 30, 2004 at 04:43:27PM -0700, Garrick Staples alleged:
> > I just spotted a pattern.  After collecting several strace samples, it =
always
> > 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 was able to insert some printf()'s after the write() to fd 5, which means=
 it
is segfaulting after that file.

The segfault is inside svc_getreqset() in utils/mountd/svc_run.c:
                switch (selret) {
                case -1:
                        if (errno =3D=3D EINTR || errno =3D=3D ECONNREFUSED
                         || errno =3D=3D ENETUNREACH || errno =3D=3D EHOSTU=
NREACH)
                                continue;
                        xlog(L_ERROR, "my_svc_run() - select: %m");
                        return;

                default:
                        selret -=3D cache_process_req(&readfds);
                        if (selret)
                                svc_getreqset(&readfds);
                }

Either glibc has a bug or the kernel is doing something fugly to the readfd=
s?

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

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