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From: Sam Lawrance <boris@brooknet.com.au>
To: Dan Nelson <dnelson@allantgroup.com>
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Date: Mon, 13 Sep 2004 00:32:26 +1000
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cc: Vladimir Grebenschikov <vova@fbsd.ru>
cc: "current@freebsd.org" <current@freebsd.org>
Subject: Re: sysutils/strace wilderness on 6-CURRENT
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On Wed, 2004-09-01 at 01:14, Dan Nelson wrote:
> In the last episode (Aug 31), Vladimir Grebenschikov said:
> > (fresh -CURREMT and fresh strace from ports, UP machine)
> > 
> > It silmple does nothing - sleeps foreaver in suspended:
> > 
> > # strace /bin/ls
> > ^T
> > load: 0.14  cmd: strace 98957 [suspended] 0.00u 0.00s 0% 760k
> > ^C
> > #
> 
> This has happened on 5.x for ages.  The quick fix is to ^Z, then fg, or
> kill -CONT the hung strace process from another vty.  I don't know what
> strace does different from truss that makes it hang.  Nowadays, truss
> does almost as good a job as strace, so I don't use it as often as I
> used to.  The only thing I miss is strace's ability to print the name
> of blocking syscalls (read or sleep for example) as it waits.

When I do "truss -f make install" on a port (I used palm/synce-serial),
the process being traced seems to hang (^T shows [stopevent], I haven't
looked further than that).

If I run without -f, the process doesn't hang. It looks like the process
is hanging at a call to vfork(). Maybe it's not just an strace problem?

-Sam