Re: ont out of 6 bcache devices does not register automatically

Stefan Priebe - Profihost AG
2017-11-22T14:16:58Z

Hi Coly,
Am 22.11.2017 um 14:29 schrieb Coly Li:
> On 22/11/2017 9:14 PM, Stefan Priebe - Profihost AG wrote:
>> Am 22.11.2017 um 13:57 schrieb Coly Li:
>>> On 22/11/2017 8:26 PM, Stefan Priebe - Profihost AG wrote:
>>>>
>>>> Am 22.11.2017 um 13:16 schrieb Coly Li:
>>>>> On 22/11/2017 7:23 PM, Stefan Priebe - Profihost AG wrote:
>>>>>> Hello,
>>>>>>
>>>>>> i've 6 bcache blk devices attached to 3 caching ssds (2 each). One fails
>>>>>> to register automatically at boot time.
>>>>>>
>>>>>> After reboot i always need to execute:
>>>>>> echo /dev/sdf1 >/sys/fs/bcache/register
>>>>>>
>>>>>> to bring up the bcache device.
>>>>>>
>>>>>> Any idea?
>>>>>
>>>>> Hi Stefan,
>>>>>
>>>>> Is there any clue from kernel message ?
>>>>
>>>> Sadly not.
>>>>
>>>> Working one:
>>>> ]# dmesg | grep sdi
>>>> [ 1.060377] sd 5:0:0:0: [sdi] 1953525168 512-byte logical blocks:
>>>> (1.00 TB/932 GiB)
>>>> [ 1.060393] sd 5:0:0:0: [sdi] Write Protect is off
>>>> [ 1.060396] sd 5:0:0:0: [sdi] Mode Sense: 00 3a 00 00
>>>> [ 1.060425] sd 5:0:0:0: [sdi] Write cache: enabled, read cache:
>>>> enabled, doesn't support DPO or FUA
>>>> [ 1.104341] sdi: sdi1
>>>> [ 1.104644] sd 5:0:0:0: [sdi] Attached SCSI disk
>>>> [ 2.005452] bcache: register_bdev() registered backing device sdi1
>>>> [ 2.045211] bcache: bch_cached_dev_attach() Caching sdi1 as bcache0
>>>> on set 76b95bf8-9cc7-407f-9f9e-a42b6d1bcb27
>>>>
>>>>
>>>> not working one:
>>>> # dmesg | grep sdf
>>>> [ 0.946107] sd 0:0:5:0: [sdf] 1953525168 512-byte logical blocks:
>>>> (1.00 TB/932 GiB)
>>>> [ 1.400267] sd 0:0:5:0: [sdf] Write Protect is off
>>>> [ 1.400267] sd 0:0:5:0: [sdf] Mode Sense: 00 00 00 00
>>>> [ 1.401347] sd 0:0:5:0: [sdf] Write cache: enabled, read cache:
>>>> enabled, supports DPO and FUA
>>>> [ 1.902910] sdf: sdf1
>>>> [ 2.341289] sd 0:0:5:0: [sdf] Attached SCSI disk
>>>> [ 295.458804] bcache: register_bdev() registered backing device sdf1
>>>> [ 295.506656] bcache: bch_cached_dev_attach() Caching sdf1 as bcache5
>>>> on set 76b95bf8-9cc7-407f-9f9e-a42b6d1bcb27
>>>>
>>>> At 295s i registeeed it manually.
>>>
>>> Hi Stefan,
>>>
>>> Hmm, I don't have idea here. Anyway, is the cache mode set as writeback?
>>> Recently I post a patch to fix a potential deadlock between writeback
>>> rate update kworker and register code, I am not sure whether it is
>>> relative to your issue, but at least we can have a try. the patch title is:
>>> [RFC] bcache: fix a circular dead locking with dc->writeback_lock and
>>> bch_register_lock
>>>
>>> Just for your information.
>>
>> i can try that one - can you please resend? I can't find that mail and
>> don't know how to grab that one our of the web html archives to apply
>> correctly.
>
> Hi Stefan,
>
> Can you download the patch from following URL:
> https://git.kernel.org/pub/scm/linux/kernel/git/colyli/bcache-patches.git/plain/for-test/0001-bcache-fix-a-circular-dead-locking-with-dc-writeback.patch

thanks, sadly it does not help. More ideas? Is there an easy way to
debug the calls to probe-bcache and bcache-register from udev?

Greets,
Stefan

> Coly Li
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