On Thu, 11 Jan 2007 21:34:12 -0800 Randy Dunlap <randy.dunlap@xxxxxxxxxx> wrote: > (resending for wider audience) > > Date: Wed, 10 Jan 2007 16:03:51 -0800 > To: linux-ext4@xxxxxxxxxxxxxxx > > > On Tue, 9 Jan 2007 15:11:23 -0800 Randy Dunlap wrote: > > > Hi, > > > > (2.6.20-rc4, x86_64 1-proc on SMP kernel, 1 GB RAM) > > > > I'm running fsx-linux (akpm ext3-tools version) on an ext3 fs > > with data=journal and fs blocksize=2048. I've been trying to > > get some kind of kernel messages from it but I can't get any > > debug IO done successfully. > > > > It has hung on me 3 times in a row today. I'm using this command: > > fsx-linux -l 100M -N 50000 -S 0 fsxtestfile > > > > This is run in a new partition on a IDE drive (/dev/hda7, > > using legacy IDE drivers). > > > > Any suggestions for debug output? I can see SysRq output on-screen > > (sometimes) but it doesn't make it to my serial console. > > > > Any patches to test? :) > > More notes: > Fails (hangs) with fs blocksize of 1024, 2048, or 4096. > On data=journal mode hangs. writeback and ordered run fine. > > After several runs (hangs), I was able to get some sysrq output > to the serial console. > > kernel config: http://oss.oracle.com/~rdunlap/configs/config-2620-rc4-hangs > message log: http://oss.oracle.com/~rdunlap/logs/fsx-capture.txt > > Can anyone see what fsx-linux is waiting on there? > Everybody got stuck in balance_dirty_pages(). The new thing in there is that an nscd instance got stuck in balance_dirty_pages() on the pagefault's new set_page_dirty_balance() path, so an mmap_sem is stuck, which causes lots of other things to get stuck. But I don't see why this should happen, really. It all seems OK here. Is any IO happening at all? You don't have any shells at all? If you do, try running /bin/sync, see if the disk lights up. Run `watch -n1 cat /proc/meminfo' when testing to see what dirty memory is doing. And `vmstat 1'. Try sysrq-S, see if that gets things unstuck. I guess it's consistent with the disk system losing its brains, too. - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
