DragonFlyBSD

:This problem also occured in preview from dec. 28 or so, but I thought recent updates fixed it, I am on the development branch as of 2007-01-22, and it occurs there as well, on every shutdown/reboot. The pictures of the crash are here:
:
:http://rnrdoctor.sytes.net/~szg/dfcrash/20070123/
:
:I haven't made core dumps, I will provide some if needed, I'll also provide dmesg etc. on request.
:TIA for looking into the issue.
:
:--
:Gergo Szakal <bastyaelvtars@gmail.com>

It is possible that this is related to Vincent's NFS mount bug report.
    I have just committed a fix for that.

If you could update head (you should get rev 1.112 of
    /usr/src/sys/kern/vfs_syscals.c) and try again, I would appreciate it.

If it still fails I will need a crash dump.

-Matt

On Tue, 23 Jan 2007 17:26:56 -0800 (PST)
Matthew Dillon <dillon@apollo.backplane.com> wrote:

No, that does not fix the issue. :-(

Picture of crash and tar'd dump available at:

http://rnrdoctor.sytes.net/~szg/dfcrash/20070124/

(Please, please, implement minidumps from freebsd :-P j/k)

:No, that does not fix the issue. :-(
:
:>
:> If it still fails I will need a crash dump.
:
:Picture of crash and tar'd dump available at:
:
:http://rnrdoctor.sytes.net/~szg/dfcrash/20070124/
:
:(Please, please, implement minidumps from freebsd :-P j/k)
:
:--
:Gergo Szakal <bastyaelvtars@gmail.com>
:University Of Szeged, HU
:Faculty Of General Medicine

The problem is that the init process is still runnable when the
    shutdown code gets to the point where it removes all remaining filesystem
    references.  The init process then seg-faults and tries to core dump,
    but there is no longer any current directory for it.

Please try this hack and tell me if it works.  The real solution is
    a bit more complex.

-Matt
                    Matthew Dillon 
                    <dillon@backplane.com>

Index: kern_shutdown.c ===================================================================
RCS file: /cvs/src/sys/kern/kern_shutdown.c,v
retrieving revision 1.47
diff u -r1.47 kern_shutdown.c
-- kern_shutdown.c 5 Jan 2007 22:16:28 0000 1.47
++ kern_shutdown.c 24 Jan 2007 19:14:16 -0000
@ -282,8 +282,13 @
if (panicstr == NULL) {
shutdown_cleanup_proc(curproc);
shutdown_cleanup_proc(&proc0);
if (initproc)
if (initproc) {
+ if (initproc != curproc) {
+ ksignal(initproc, SIGSTOP);
+ tsleep(boot, 0, "shutdn", hz / 20);
+ }
shutdown_cleanup_proc(initproc);
+ }
vfs_cache_setroot(NULL, NULL);
}

On Wed, 24 Jan 2007 11:19:12 -0800 (PST)
Matthew Dillon <dillon@apollo.backplane.com> wrote:

Your patch fixes the problem. Thank you!

oooh. evil. can't we just kill init?

cheers
simon

:oooh. evil. can't we just kill init?
:
:cheers
: simon

We'd probably panic in the the child process reparenting code 
    without init, so no.  I'd rather just stop it.

-Matt
                    Matthew Dillon 
                    <dillon@backplane.com>

Hack committed:
http://leaf.dragonflybsd.org/mailarchive/commits/2007-01/msg00339.html