DatagramCahnnel scatter/gather problem on diablo 1.6.0_07-b02

[Joe Lin]

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 = NULL;
    m.msg_namelen = 0;
    m.msg_iov = iov;
    m.msg_iovlen = len;
#ifdef __solaris__
    m.msg_accrights = NULL;
    m.msg_accrightslen = 0;
#endif

#ifdef __linux__
    m.msg_control = NULL;
    m.msg_controllen = 0;
#endif

-----Original Message-----
From: Pieter de Goeje [mailto:pieter at degoeje.nl] 
Sent: Monday, February 01, 2010 5:08 PM
To: freebsd-java at 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 seems 
that java passes bogus data in msg_flags and possibly msg_control and 
msg_controllen fields of struct msghdr:

(gdb) p *m
$4 = {msg_name = 0x0, msg_namelen = 0, msg_iov = 0x5dee4e00, msg_iovlen = 2, 
msg_control = 0x29012e74, msg_controllen = 10480328, msg_flags = 740777920}


>
> -----Original Message-----
> From: Pieter de Goeje [mailto:pieter at degoeje.nl]
> Sent: Monday, February 01, 2010 3:08 AM
> To: freebsd-java at freebsd.org
> Cc: Joe Lin
> Subject: Re: DatagramCahnnel scatter/gather problem on diablo 1.6.0_07-b02
>
> 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 the
> > 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/what
> > 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 does
> > not return an EINVAL. So the Diablo port must be calling a writev(). But
> > 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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-- 
Pieter de Goeje

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