Re: [issue2039] Sometimes, DragonFly 2.9 systems can not reboot

[Sepherosa Ziehau <sepherosa@xxxxxxxxx>]

On Wed, Apr 6, 2011 at 2:16 PM, Matthew Dillon
<dillon@apollo.backplane.com> wrote:
> :I have found a reliable way to trigger it:
> :switch to single user mode
> :mount -a
> :cd /usr/src
> :make installworld && make upgrade && reboot
> :
> :print_uptime() has not been called in my case.
> :
> :Best Regards,
> :sephe
>
>    Hmm.  If the uptime is not displayed this implies that the
>    vfs_unmountall() call is getting stuck.

Yes, vfs_unmountall() blocks the rebooting.

With the following patch:
http://leaf.dragonflybsd.org/~sephe/umountall_print.diff

In single user mode:
make installworld && make upgrade && reboot
. ..
. ..
hammer callback start
<---------- ("nobusy callback done" is not logged, and reboot stops here)

Best Regards,
sephe

>
>    Try with the latest master, I made some adjustments that might effect
>    raw device closes.  If swapcache is turned on try turning it off
>    (though my latest patch turns it off on shutdown automatically, too).
>
>    So far I cannot replicate the issue on my test box.  I did have
>    reboot issues in past related to swapcache but those are gone now
>    w/my recent commits.
>
>    Other possible causes: tmpfs, vn, usb mounts, procfs, etc.
>
>    If you can reliably replicate the problem you may have to add a bunch
>    of kprintf()'s to the umountall iterator to track down which filesystem
>    is getting stuck.  I have included a df of my test box below.
>
>                                                -Matt
>
>
> Filesystem                         1K-blocks       Used      Avail Capacity  Mounted on
> ROOT                                195452928  64848560  130604368    33%    /
> devfs                                       1         1          0   100%    /dev
> /dev/serno/L41K2H5G.s1a                774094    216628     495540    30%    /boot
> /pfs/@@-1:00001                     195452928  64848560  130604368    33%    /var
> /pfs/@@-1:00002                     195452928  64848560  130604368    33%    /tmp
> /pfs/@@-1:00003                     195452928  64848560  130604368    33%    /usr
> /pfs/@@-1:00004                     195452928  64848560  130604368    33%    /home
> /pfs/@@-1:00005                     195452928  64848560  130604368    33%    /usr/obj
> /pfs/@@-1:00006                     195452928  64848560  130604368    33%    /var/crash
> /pfs/@@-1:00007                     195452928  64848560  130604368    33%    /var/tmp
> BUILD                               104398848  42510688   61888160    41%    /build3
> procfs                                      4         4          0   100%    /proc
> apollo.backplane.com:/usr/src      1934024704 292436496 1641588208    15%    /usr/src
> apollo.backplane.com:/usr/src-misc 1934024704 292436496 1641588208    15%    /usr/src-misc
> apollo.backplane.com:/usr/pkgsrc   1934024704 292436496 1641588208    15%    /usr/pkgsrc
> apollo.backplane.com:/netboot1     1934024704 292436496 1641588208    15%    /netboot1
> test29#
>
>



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