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Date:      Wed, 5 Sep 2001 13:50:40 -0700
From:      Marcel Moolenaar <marcel@xcllnt.net>
To:        John Baldwin <jhb@FreeBSD.org>
Cc:        current@FreeBSD.org
Subject:   Re: Linuxulator: possible Giant pushdown victim
Message-ID:  <20010905135040.A398@athlon.pn.xcllnt.net>
In-Reply-To: <XFMail.010905110404.jhb@FreeBSD.org>
References:  <20010905100651.A5560@gauss.cup.hp.com> <XFMail.010905110404.jhb@FreeBSD.org>

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On Wed, Sep 05, 2001 at 11:04:04AM -0700, John Baldwin wrote:
> 
> On 05-Sep-01 Marcel Moolenaar wrote:
> > Hi,
> > 
> > I get consistent locks when trying to run Mozilla for Linux (RH 7.1).
> > 
> > Breaking into the debugger, I see it hangs in fork_exit()+180. This
> > is should be the PROC_LOCK(p) in the source file (kern_fork.c).
> 
> Can you do 'show locks <pid>' where <pid> is the pid of the mozilla process?
> Also, what does a 'trace' of the pid in question show?  (I take it this is how
> you know where it locked up?)

show locks <pid> gives nothing for all cloned mozilla processes. This
strikes me as odd. Another strange thing is that it seems to have a
local effect at first (ie only mozilla hangs), but when trying to
compose an email on the same machine (for example), it locks up hard.

I give you a complete trace when I call it a day at the office. In the
mean time, this is roughly it (warning, from memory):

Debugger
...
intr...kbd
intr...isa
ithread_loop
fork_exit
fork_trampoline

My guess is that everything beginning with ithread_loop is related to
me breaking into the debugger with CA-ESC.

When I get back home again, I'll try this on Alpha as well. The Alpha
has already got a serial console, so it's easier to experiment at this
time.

Please standby... :-)

-- 
 Marcel Moolenaar	  USPA: A-39004		 marcel@xcllnt.net

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