[DRBD-user] drbd-9.0.18-1 : BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0

[Rob van der Wal]

Hi,

Great! Nice to hear that the problem area is found. Can I download the 
updated source? Or can you provide me with the patch on the source file? 
Then I'm able to test it.

Regards,
Rob van der Wal


On 6/12/19 3:43 PM, Lars Ellenberg wrote:
> On Wed, Jun 12, 2019 at 10:39:14AM +0200, Joel Colledge wrote:
>> Hi Rob,
>>
>> This message indicates that mounting with DAX is failing here:
>> https://github.com/openSUSE/kernel/blob/SLE12-SP4/drivers/dax/super.c#L131
>>
>> But DRBD performs the corresponding check here:
>> https://github.com/LINBIT/drbd-9.0/blob/drbd-9.0.18-1/drbd/drbd_dax_pmem.c#L57
> Hm.
> Unfortunately ((unsigned long)-ENOTSUP < 1) is false,
> we simply did not notice error returns :-(
> Fixed now.
>
> Still, a block device claiming to support it,
> but then returning "sorry, not supported"
> once you actually try to use it, is ... not very friendly either.
>
>>> [525370.955135] dm-16: error: dax access failed (-95)

-- 
Rob van der Wal
Supercomputing | SURFsara | Science Park 140 | 1098 XG Amsterdam | T +31 
20 800  1300 | Rob.vanderWal at surfsara.nl | www.surfsara.nl |

             We are ISO 27001 certified and meet the high requirements 
for information security.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20190613/efa82814/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: SURFsara
Type: image/png
Size: 2515 bytes
Desc: not available
URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20190613/efa82814/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ISO27001
Type: image/png
Size: 1742 bytes
Desc: not available
URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20190613/efa82814/attachment-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 3704 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20190613/efa82814/attachment.bin>