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SubjectRe: [REGRESSION] 6.7.1: md: raid5 hang and unresponsive system; successfully bisected
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Date
Hi,

在 2024/01/31 9:26, Song Liu 写道:
>> Scenario:
>> 1. Create raid10:
>> mdadm --create /dev/md/r10d4s128-15_A --level=10 --chunk=128
>> --raid-devices=4 /dev/nvme6n1 /dev/nvme2n1 /dev/nvme3n1 /dev/nvme0n1
>> --size=7864320 --run
>> 2. Create FS
>> mkfs.ext4 /dev/md/r10d4s128-15_A
>> 3. Set faulty one raid member:
>> mdadm --set-faulty /dev/md/r10d4s128-15_A /dev/nvme3n1
> With a failed drive, md_thread calls md_check_recovery() and kicks
> off mddev->sync_work, which is md_start_sync().
> md_check_recovery() also sets MD_RECOVERY_RUNNING.
>
> md_start_sync() calls mddev_suspend() and waits for
> mddev->active_io to become zero.
>
>> 4. Stop raid devies:
>> mdadm -Ss
> This command calls stop_sync_thread() and waits for
> MD_RECOVERY_RUNNING to be cleared.
>
> Given we need a working file system to reproduce the issue, I
> suspect the problem comes from active_io.

I'll look into this. But I don't understand the root cause yet.
Who grab the 'active_io' and why doesn't release it?

Thanks,
Kuai

>
> Yu Kuai, I guess we missed this case in the recent refactoring.
> I don't have a good idea to fix this. Please also take a look into
> this.


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