[BUG] I/O timeouts and system freezes on Kingston A2000 NVME with BCACHEFS

[Jens Axboe]

On 1/19/24 2:34 PM, Kent Overstreet wrote:
> On Fri, Jan 19, 2024 at 02:22:04PM -0700, Jens Axboe wrote:
>> On 1/19/24 5:25 AM, Mia Kanashi wrote:
>>> This issue was originally reported here: https://github.com/koverstreet/bcachefs/issues/628
>>>
>>> Transferring large amounts of files to the bcachefs from the btrfs
>>> causes I/O timeouts and freezes the whole system. This doesn't seem to
>>> be related to the btrfs, but rather to the heavy I/O on the drive, as
>>> it happens without btrfs being mounted. Transferring the files to the
>>> HDD, and then from it to the bcachefs on the NVME sometimes doesn't
>>> make the problem occur. The problem only happens on the bcachefs, not
>>> on btrfs or ext4. It doesn't happen on the HDD, I can't test with
>>> other NVME drives sadly. The behaviour when it is frozen is like this:
>>> all drive accesses can't process, when not cached in ram, so every app
>>> that is loaded in the ram, continues to function, but at the moment it
>>> tries to access the drive it freezes, until the drive is reset and
>>> those abort status messages appear in the dmesg, after that system is
>>> unfrozen for a moment, if you keep copying the files then the problem
>>> reoccurs once again.
>>>
>>> This drive is known to have problems with the power management in the
>>> past:
>>> https://wiki.archlinux.org/title/Solid_state_drive/NVMe#Troubleshooting
>>> But those problems where since fixed with kernel workarounds /
>>> firmware updates. This issue is may be related, perhaps bcachefs does
>>> something different from the other filesystems, and workarounds don't
>>> apply, which causes the bug to occur only on it. It may be a problem
>>> in the nvme subsystem, or just some edge case in the bcachefs too, who
>>> knows. I tried to disable ASPM and setting latency to 0 like was
>>> suggested, it didn't fix the problem, so I don't know. If this is
>>> indeed related to that specific drive it would be hard to reproduce.
>>
>> From a quick look, looks like a broken drive/firmware. It is suspicious
>> that all failed IO is 256 blocks. You could try and limit the transfer
>> size and see if that helps:
>>
>> # echo 64 > /sys/block/nvme0n1/queue/max_sectors_kb
>>
>> Or maybe the transfer size is just a red herring, who knows. The error
>> code seems wonky:
> 
> Does nvme have a blacklist/quirks mechanism, if that ends up resolving
> it?

It does, in fact this drive is already marked as having broken suspend.
So not too surprising if it's misbehaving in other ways too, I guess.

-- 
Jens Axboe