[dm-crypt] Kernel BUG (fs/bio.c:1499) when copying more files to an encrypted device

Luzipher McLeod luziphermcleod at yahoo.ie
Wed Jan 25 09:06:34 CET 2012


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 ...)

Regards,
Luzipher



--- On Wed, 25/1/12, Mandeep Singh Baines <msb at chromium.org> wrote:

> From: Mandeep Singh Baines <msb at chromium.org>
> Subject: Re: [dm-crypt] Kernel BUG (fs/bio.c:1499) when copying more files to an encrypted device
> To: "Luzipher McLeod" <luziphermcleod at yahoo.ie>
> Cc: dm-crypt at saout.de, "NeilBrown" <neilb at suse.de>
> Date: Wednesday, 25 January, 2012, 2:14
> Luzipher McLeod (luziphermcleod at yahoo.ie)
> 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
> 



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