On Thu, 02 Dec 2010 10:42:51 +0100 Miklos Szeredi <miklos@xxxxxxxxxx> wrote: > On Thu, 2 Dec 2010, Michael Leun wrote: > > > Kernel compile 2.6.36.1 with that .page_mkwrite commented out > > > running now, will reboot really soon now (TM). > > > > OK - that happened very fast again in 2.6.36.1. > > > > Sorry for that tainted kernel, but cannot afford to additionally > > have graphics lockups all the time - I've shown that it happens with > > untainted kernel also (long run without fault yesterday also was > > with nvidia.ko driver). > > > > Until I've another suggestion what to try I'll swich back to 2.6.36 > > to see if it really happens less frequent there. > > Can you please describe in detail the workload that's causing this to > happen? Thats rather complicated, but I'll try. Basically it boils down to: unshare -n -m /bin/bash unionfs -o cow,suid,allow_other,max_files=65536 /home/netenv/user1-union=RW:/=RO /home/netenv/user1 mount -n -t proc none /home/netenv/user1/proc mount -n -t sysfs none /home/netenv/user1/sys mount -n -t devtmpfs devtmpfs /home/netenv/user1/dev mount -n -t devpts devpts /home/netenv/user1/dev/pts chroot /home/netenv/user1 /bin/su - user1 Then run some shell-scripts in this shell running as user1. Of course there is some more stuff as getting network connectivity in this new namespace and so on, but I guess thats not important for the fuse problem. Then there are some (up to 6 at the moment) more setups like the above one with different users (user2, user3 and so on) running concurrent. In some of this setups two or more environments share the same writable branch, so the files in this environments changed against real root of the machine are the same, e.g.: [...] unionfs -o cow,suid,allow_other,max_files=65536 /home/netenv/commondir=RW:/=RO /home/netenv/user1 [...] and another one [...] unionfs -o cow,suid,allow_other,max_files=65536 /home/netenv/commondir=RW:/=RO /home/netenv/user2 [...] I observed that unionfs process takes much more cpu power than usual before fault happens. elektra:~ # unionfs --version unionfs-fuse version: 0.24 FUSE library version: 2.8.5 fusermount version: 2.8.5 using FUSE kernel interface version 7.12 -- MfG, Michael Leun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>