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Re: zio->io_cv deadlock

To: Peter Jeremy <peterjeremy_(_at_)_optushome_(_dot_)_com_(_dot_)_au>, Kevin Day <toasty_(_at_)_dragondata_(_dot_)_com>
Subject: Re: zio->io_cv deadlock
From: Goran Lowkrantz <glz_(_at_)_hidden-powers_(_dot_)_com>
Date: Thu, 12 Feb 2009 11:06:25 +0100
Cc: freebsd-fs_(_at_)_freebsd_(_dot_)_org
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--On February 12, 2009 5:07:43 +1100 Peter Jeremy<peterjeremy_(_at_)_optushome_(_dot_)_com_(_dot_)_au> wrote:

On 2009-Feb-08 22:59:31 -0600, Kevin Day <toasty_(_at_)_dragondata_(_dot_)_com> wrote:


I'm playing with a -CURRENT install from a couple of weeks ago.
Everything  seems okay for a few days, then eventually every process
ends up stuck in  zio->io_cv. If I go to the console, it's responsive
until I try logging in,  then login is stuck in zio->io_cv as well.
Ctrl-Alt-Esc drops me into ddb,  but then ddb hangs instantly.


I think I've seen this as well, though I can't be sure because X.org 7.4
had trashed my console output.  Definitely, I could enter DDB but the
crashdump I requested (blind) never appeared.  I don't believe I was
doing anything unusual (other than trying to use X.org 7.4).

I see this now and then in single-user mode during make installworld,ezjail-admin update -i or in multi-user when building a system in thebackground and updating ports at the same time.

I have an USB keyboard and have not been able to break into the debuggerwith that, have legacy mode enabled in the bios (award).


Anyone know how to send break from USB tgb?

/glz


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References:
- zio->io_cv deadlock
  - From: Kevin Day
- Re: zio->io_cv deadlock
  - From: Peter Jeremy

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