Peter Jeremy wrote:
> On Thu, 2005-Nov-17 00:00:03 -0800, Rob wrote:
>
>>The only way I know of how to trigger the deadlock, is to compile
>>a new kernel and the 'linking kernel' stage will lock-up the PC.
>>With a regular kernel, this takes 2.5 hours until deadlock, but with
>>a fully equipped debug kernel it takes about 8 hours....
>
>
> When the first deadlock occurs, you have a fully populated set of kernel
> objects (though possibly some of them are in the buffer case rather than
> on disk). You should be able to quickly reproduce the panic by running:
> # cd /usr/obj/usr/src/sys/<<KERNEL>>
> # make
I'm doing this right now...
Although I have not got into the deadlock yet, I do get these lines
in the serial console:
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 12333, size: 4096
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 22990, size: 4096
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 22928, size: 4096
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 22625, size: 8192
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 22990, size: 4096
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 22784, size: 8192
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 23233, size: 4096
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 23404, size: 4096
swap_pager: indefinite wait buffer: bufobj: 0, blkno: 23154, size: 4096
A typical snapshot of 'swapinfo' at this time is:
Device 1K-blocks Used Avail Capacity
/dev/ad0s1b 39848 39840 39848 100%
/dev/md0 131072 54136 131072 41%
Total 170920 93976 76944 55%
(By the way, notice that the 'Avail' column of /dev/ad0s1b and
/dev/md0 is wrong; for Total it's correct.
Is this a general bug in 6 or only on my PC? )
Googling on the above swap_pager lines, I found this conversation:
http://lists.freebsd.org/pipermail/freebsd-current/2005-September/055550.html
which claims that DragonFly has fixed this problem.
Regards,
Rob.
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