>If you see a race in this my new patch, please let me know and probably
>you'll give me a good reason to reinsert mm_lock ;)
I spoke too soon. :(
With that latest patch I was still able to get lots of procs stuck in D,
but it was harder. ^_^;
I was playing with modules, trying to get it to hang that way (very
successful there). At the end of one experiment there was no crash but
rather a lot of D procs. Details:
Alpha PC164 (LX). 128M, egcs-1.1.1.
MSDOS configured as a module. Stick a floppy in the floppy drive.
# mount -o remount,ro /home ; be safe
# mount -o remount,ro /usr
# mformat a:
# mount -t msdos /dev/fd0 /tmp/mnt
now /proc/modules contains:
msdos 11600 1 (autoclean)
fat 33656 1 (autoclean) [msdos]
Run this script:
--- #! /bin/shwhile true; do cp -av /usr/src/linux/arch/ppc /tmp/mnt/ppc ls -lR /tmp/mnt rm -rf /tmp/mnt/ppc done
---In another window, make MAKE="make -j5" dep. Now normally, with msdos as a module, this causes the machine to hang (alt-sysrq unresponsive) after a few minutes (often after it has started to swap stuff out, but I'm having trouble narrowing it down more than that).
This last time, I got D procs. Again, this is with Andrea's latest patch. Without that patch, the make dep is guaranteed to fail almost right away, but with it I was able to do this about 4 times before it occured.
1188 1175 root 1496 664 end D 0.0 0.5 0:00 make 1213 1183 root 1208 664 end D 0.0 0.4 0:00 make 1224 1177 root 1320 664 end D 0.0 0.5 0:00 make 1226 1177 root 1256 664 end D 0.0 0.4 0:00 make 1247 1190 root 1272 664 end D 0.0 0.4 0:00 make
I'll try again with the earlier patch.
Dr. Tom Holroyd I would dance and be merry, Life would be a ding-a-derry, If I only had a brain. -- The Scarecrow
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