Luzipher McLeod (luziphermcleod@xxxxxxxx) wrote: > Hi Mandeep, > > Thanks fpr your quick answer. So, what can be done about this ? Should I try to apply that patch you linked to ? (but I guess a patch from 2007 won't apply cleanly ...) > Hi Luzipher, I wouldn't apply the patch directly. Just copy bio_multi_split (might need to do some forward porting) and then modify linear_make_request to use bio_multi_split instead of bio_split. But I'm not really an expert on this particular code. I'm hoping someone else will confirm that this is in fact the bug and not a side effect of something else. Its seem reasonble that you could get a bio that is multi-page and falls on a boundary (spans two or more devices). So I suspect this is the bug. Regards, Mandeep > Regards, > Luzipher > > > > --- On Wed, 25/1/12, Mandeep Singh Baines <msb@xxxxxxxxxxxx> wrote: > > > From: Mandeep Singh Baines <msb@xxxxxxxxxxxx> > > Subject: Re: Kernel BUG (fs/bio.c:1499) when copying more files to an encrypted device > > To: "Luzipher McLeod" <luziphermcleod@xxxxxxxx> > > Cc: dm-crypt@xxxxxxxx, "NeilBrown" <neilb@xxxxxxx> > > Date: Wednesday, 25 January, 2012, 2:14 > > Luzipher McLeod (luziphermcleod@xxxxxxxx) > > wrote: > > > Hi :-) > > > > > > A few days ago I encountered a kernel bug while copying > > files to an encrypted filesystem. The specific stack for the > > filesystem is: btrfs-on-crypt-on-mdraid. Vasts amounts of > > data copied without problems (about 6.3TB with 1.1 TB > > remaining), but when copying a certain directory, the kernel > > bug surfaces. I repeatedly deleted the affected directory > > and tried to re-copy it, but it always fails at the same > > point (or close to that). More recent test showed that I > > could copy a few more files to the filesystem to a different > > directory, but it very quickly failed there as well (a few > > megabytes later). > > > After talking to the btrfs devs on freenode (as btrfs > > is the most experimental thing in the stack, they came to > > the conclusion that it's most probably the crypto layer. > > > > > > Some details: > > > gentoo kernel 3.2.1 (custom config and ubuntu config) > > > mdraid: linear, 4 disks, each 2TB (total 8TB) > > > crypt: setup via cryptsetup -c aes-xts-plain64 -h plain > > -s 512 -d - create tempraid /dev/md/tempraid_lin > > > > > > I'd appreciate any help with this and would be happy to > > test patches or provide more debug info. > > > > > > Thanks and Regards, > > > Luzipher > > > > > > > > > > > > > > > The kernel bug output retrieved by netconsole (also at > > http://pastebin.com/sjJy7QE4 ): > > > [ 294.538422] netconsole: > > local port 6666 > > > [ 333.423583] SysRq : > > Changing Loglevel > > > [ 333.423609] Loglevel > > set to 9 > > > [ 424.248405] > > ------------[ cut here ]------------ > > > [ 424.248447] kernel BUG > > at fs/bio.c:1499! > > > > Hi Luzipher, > > > > Looks like the BUG is because bio_split only works on > > single-page iovecs. > > > > I see a relevant (old) patch from Neil Brown here: > > > > https://lkml.org/lkml/2007/7/30/496 > > > > Regards, > > Mandeep > > > _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
