Messages in this thread | | | Date | Fri, 3 Dec 2010 08:53:50 +0100 | From | Michael Leun <> | Subject | Re: kernel BUG at mm/truncate.c:475! |
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On Thu, 2 Dec 2010 11:57:22 +0100 Michael Leun <lkml20101129@newton.leun.net> wrote:
> > 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 [...] > 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 > [...]
Additional note: Happens also WITHOUT that "two unionfs mounts use the same branch dir" stuff.
Really seems to happen much more often in 2.6.36.1 than in 2.6.36.
> I observed that unionfs process takes much more cpu power than usual > before fault happens.
This also happens without that "two unionfs mounts use the same branch dir" stuff.
-- MfG,
Michael Leun
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