Seeing lock order reversal
attilio at freebsd.org
Tue Mar 18 11:45:49 PDT 2008
2008/3/18, pluknet <pluknet at gmail.com>:
> On 18/03/2008, Alex Goncharov <alex-goncharov at comcast.net> wrote:
> > [ Sorry if this is old news or not useful ]
> > I am trying to source-upgrade one of my 7.0 systems to 8.0-CURRENT.
> > In the following, when I say "build", it means "csup and build right
> > away".
> > The very first 8.0 build (this morning) gave me the kernel that didn't
> > boot. Built it again, finishing about 15 minutes ago. This one
> > booted all right but I see this in `/var/log/messages':
> [there was stripped LORs]
> It's due to recent WITNESS lockmgr support that unhides existing LORs.
> Thought taking that into account I could obtain a new one yesterday. I
> didn't see this before.
> Mar 17 03:17:14 pl sudo: pluknet : TTY=ttyv1 ; PWD=/usr/home/pluknet
> ; USER=root ; COMMAND=/usr/libexec/getty 3wire.9600 ttyd0
> Mar 17 03:17:14 pl kernel: lock order reversal:
> Mar 17 03:17:14 pl kernel: 1st 0xc07e9274 proctree (proctree) @
> Mar 17 03:17:14 pl kernel: 2nd 0xc2fc49e8 devfs (devfs) @
This one seems interesting.
Next time you experience it can you please drop in DDB and print-out
the correct order revealed by WITNESS?
Peace can only be achieved by understanding - A. Einstein
More information about the freebsd-current