Messages in this thread |  | | Date | Sun, 27 Aug 2000 13:52:50 -0400 (EDT) | From | William Stearns <> | Subject | kernel 2.4 status page - loopback mount option still has problems even in 2.4.0-test7-final. |
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Good day, Ted and all, The loopback mount option is still not 100% there for me in 2.4.0-test7; there appears to be some kind of deadlock still there (thenks arjan and cesarb!). Here's the line from your 2.4 status page:
- Loop device hangs (Peter Enderborg can duplicate by writing large file to dosfs mounted via loop device; Steve Dodd reports deadlock issues; Linus says fixed in test6)
I do quite a bit of work with creating a 50-200M file, making an ext2 filesystem on it, then loading it with rpms for User Mode Linux. On a 256M machine with other apps running, I find I can do this 3 to 5 times before the machine hangs (no oops, some apps still run, nothing from dmesg, apps stuck in the "D" state according to ps, unable to shutdown or halt, unable to unmount the loopback'ed filesystem).
I should briefly add that my two most recent kernels have been 2.4.0-test7-pre4 with Rik's vm patch and 2.4.0-test7-final with Ingo's low latency patch, but this problem has existed for a long time; I'd say at least as long as the 2.4.0-test series. I'll try to come up with a pristine 2.4.0-test7 as another test, but I'm not terribly optimistic. The problem shows up whether X is running or not.
Here's a simplified version of the script I use. This one can reliably hang the system up to and including 2.4.0-test7. If it doesn't hang the system on first pass, keep running it a few times. Make sure you've saved your work first. :-)
---- [snip] ---- #!/bin/bash
if [ ! -d mnt ]; then mkdir mnt ; fi
dd if=/dev/zero of=testroot bs=$((1024 * 1024)) count=130 || exit 1 sudo mke2fs -F testroot || exit 1
sudo umount mnt || true sudo mount -o loop testroot mnt || exit 1
cd mnt df cp -pR /usr/src/linux . df cd .. sudo umount mnt || exit 1 ---- [snip] ----
I would sincerely like to hear if this is repeatable on anyone else's system. Please: 1) save your work first, and 2) let me know off-list if you can reproduce the problem or not. I'll summarize to the list in a few days. Cheers, - Bill
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