Re: LVM2 test breakage

[Zdenek Kabelac <zdenek.kabelac@gmail.com>]

Dne 19. 05. 25 v 13:07 Yu Kuai napsal(a):
> Hi,
> 
> 在 2025/05/19 18:45, Zdenek Kabelac 写道:
>> Dne 19. 05. 25 v 12:10 Mikulas Patocka napsal(a):
>>> On Mon, 19 May 2025, Yu Kuai wrote:
>>>
>>>> Hi,
>>>>
>>>> 在 2025/05/19 9:11, Yu Kuai 写道:
>>>>> Hi,
>>>>>
>>>>> 在 2025/05/17 0:00, Mikulas Patocka 写道:
>>>>>> Hi
>>>>>>
>>>>>> The commit e879a0d9cb086c8e52ce6c04e5bfa63825a6213c breaks the test
>>>>>> shell/lvcreate-large-raid.sh in the lvm2 testsuite.
>>>>>>
>>>>>> The breakage is caused by removing the line "read_bio->bi_opf = op |
>>>>>> do_sync;"
>>>>>>
>>>> Do I need some special setup to run this test? I got following
>>>> result in my VM, and I don't understand why it failed.
>>>>
>>>> Ask Zdenek Kabelac - he is expert in the testsuite.
>>>>
>>>> Mikulas
>>
>>
>> Hi
>>
>>
>> Lvm2 test suite is creating 'virtual' disk setup - it usually tries first 
>> build something with 'brd' - if this device is 'in-use' it fallback to 
>> create some files in LVM_TEST_DIR.
>>
>> This dir however must allow creation of device - by default nowdays /dev/shm 
>> & /tmp are mounted with  'nodev' mount option.
>>
>> So a dir which does allow dev creation must be passed to the test - so 
>> either remount dir without 'nodev' or set LVM_TEST_DIR to the filesystem 
>> which allows creation of devices.
> 
> Yes, I know that, and I set LVM_TEST_DIR to a new mounted nvme, as use
> can see in the attached log:
> 
> [ 0:02.335] ## DF_H:    /dev/nvme0n1     98G   64K   93G   1% /mnt/test

Hi

Please  check the output of 'mount' command whether your mount point /mnt/test
allows creation of devices  (i.e. does not use 'nodev' as setting for this 
mountpoint)


> 
>>
>> In 'lvm2/test'   run  'make help'  to see all possible settings - useful one 
>> could be LVM_TEST_AUX_TRACE  to expose shell traces from test internals - 
>> helps with debugging...
> The log do have shell trace, I think, it stoped here, I just don't know
> why :(
> 
> [ 0:01.709] ## - /root/lvm2/test/shell/lvcreate-large-raid.sh:31
> [ 0:01.710] ## 1 STACKTRACE() called from /root/lvm2/test/shell/lvcreate- 
> large-raid.sh:31
> 


Run:

   'make check_local T=lvcreate-large-raid LVM_TEST_AUX_TRACE=1  VERBOSE=1'

for more closer look why it is failing when preparing devices.
My best guess is the use of 'nodev' flag   (thus mount with '-o dev')


Regards

Zdenek