Date: Mon, 1 Feb 2010 19:13:56 -0600 From: Joe Lin <jlin@maxiscale.com> To: "freebsd-java@freebsd.org" <freebsd-java@freebsd.org> Cc: Pieter de Goeje <pieter@degoeje.nl> Subject: RE: DatagramCahnnel scatter/gather problem on diablo 1.6.0_07-b02 Message-ID: <8B6860326495B2438DCBEA74AA981C7A78B224DE@MBX01.exg5.exghost.com> In-Reply-To: <201002020207.30685.pieter@degoeje.nl> References: <8B6860326495B2438DCBEA74AA981C7A78B220E0@MBX01.exg5.exghost.com> <201002011207.57163.pieter@degoeje.nl> <8B6860326495B2438DCBEA74AA981C7A78B22476@MBX01.exg5.exghost.com> <201002020207.30685.pieter@degoeje.nl>
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I think that is the problem. As I looked at the code in DatagramDispatcher.=
c:writev0(), these fields only got zeroed out in solaris or linux:
m.msg_name =3D NULL;
m.msg_namelen =3D 0;
m.msg_iov =3D iov;
m.msg_iovlen =3D len;
#ifdef __solaris__
m.msg_accrights =3D NULL;
m.msg_accrightslen =3D 0;
#endif
#ifdef __linux__
m.msg_control =3D NULL;
m.msg_controllen =3D 0;
#endif
-----Original Message-----
From: Pieter de Goeje [mailto:pieter@degoeje.nl]=20
Sent: Monday, February 01, 2010 5:08 PM
To: freebsd-java@freebsd.org
Cc: Joe Lin
Subject: Re: DatagramCahnnel scatter/gather problem on diablo 1.6.0_07-b02
On Monday 01 February 2010 23:42:27 Joe Lin wrote:
> Did a struss and the error happened with sendmsg call:
>
> sendmsg(0x4,0x7fffffbfe580,0x0,0x1,0x2,0x830c17de8) ERR#22 'Invalid
> argument'
The struss output is broken because sendmsg only takes 3 arguments. It seem=
s=20
that java passes bogus data in msg_flags and possibly msg_control and=20
msg_controllen fields of struct msghdr:
(gdb) p *m
$4 =3D {msg_name =3D 0x0, msg_namelen =3D 0, msg_iov =3D 0x5dee4e00, msg_io=
vlen =3D 2,=20
msg_control =3D 0x29012e74, msg_controllen =3D 10480328, msg_flags =3D 7407=
77920}
>
> -----Original Message-----
> From: Pieter de Goeje [mailto:pieter@degoeje.nl]
> Sent: Monday, February 01, 2010 3:08 AM
> To: freebsd-java@freebsd.org
> Cc: Joe Lin
> Subject: Re: DatagramCahnnel scatter/gather problem on diablo 1.6.0_07-b0=
2
>
> On Monday 01 February 2010 02:08:55 Joe Lin wrote:
> > Thanks for the reply. I looked at JDK source code and it appears that t=
he
> > JNI call should be in
> >
> > J2se/src/solaris/native/sun/nio/ch/DatagramDispatcher.c:write0():
> >
> >
> > There's only linux and solaris #ifdef but not for BSD. I wonder how/wha=
t
> > BSD is calling. Since I'm getting a "IOException:Invalid argument" so I
> > guess this should correspond to a EINVAL. And a sendmsg() in FreeBSD do=
es
> > not return an EINVAL. So the Diablo port must be calling a writev(). Bu=
t
> > I could not locate the source code. Wish I can find out what went wrong
> > with dialblo VM.
>
> You could use ktrace/kdump to find out what it (not?) calls and why it
> dies.
>
> - Pieter
>
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--=20
Pieter de Goeje
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Checked by AVG - www.avg.com=20
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