Re: Can't register existing backing devices anymore

[Eric Wheeler <bcache@lists.ewheeler.net>]

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On Mon, 14 Aug 2017, Jorg Bornschein wrote:

> August 13, 2017 4:44 PM, "Coly Li" <colyli@suse.de> wrote:
> 
> Hi Coly, 
> 
> 
> were you able to reproduce my problem?

Hi Jorg,

Can you convert those memory offsets to line numbers in the backtrace with 
something like `gdb vmlinuz` and `list *(bch_bucket_alloc+0xa5/0x350)` ? 
(Someone correct me if the gdb list command is slightly different, it has 
been a while.)

It sounds like a registration race, maybe a simple spinlock or mutex is 
appropriate here.

--
Eric Wheeler



> 
> 
>    j 
> 
> 
> > On 2017/8/13 下午11:40, Jorg Bornschein wrote:
> > 
> >> August 13, 2017 4:27 PM, "Coly Li" <colyli@suse.de> wrote:
> >> 
> >> Hi Coly,
> >> 
> >>> Could you please give me some hint how the /dev/dm- nodes are created ?
> >>> I will try to reproduce it on my hardware.
> >>> 
> >>> Thanks for the report.
> >> 
> >> I created them with 'cryptsetup luksFormat ...', IIRC. When I run 'cryptsetup luksDump' I get:
> >> 
> >> Version: 1
> >> Cipher name: aes
> >> Cipher mode: xts-plain64
> >> Hash spec: sha256
> >> Payload offset: 4096
> >> MK bits: 256
> >> MK digest: <STUFF>
> >> MK salt: <STUFF>
> >> MK iterations: 400000
> >> UUID: 81a8d12e-9309-4317-b447-ab3c86e2f7ea
> >> 
> >> Key Slot 0: ENABLED
> >> Iterations: 3200000
> >> Salt: <STUFF>
> >> Key material offset: 8
> >> AF stripes: 4000
> >> 
> >> and this is the contents of my /etc/crypttab:
> >> 
> >> # <name> <device> <password> <options>
> >> crypted-sdb /dev/sdb1 /etc/cryptfs.key
> >> crypted-sdc /dev/sdc1 /etc/cryptfs.key
> >> crypted-sdd /dev/sdd1 /etc/cryptfs.key
> >> crypted-sde /dev/sde1 /etc/cryptfs.key
> > 
> > Oh, I don't use cryptsetup before, let me try ... Thanks for the hint :-)
> > 
> > Coly Li
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