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Date: Sun, 8 Mar 2026 17:16:43 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Nils Reuter <nils.reuter@gmx.net>
Cc: linux-usb@vger.kernel.org
Subject: Re: [BUG] UAS protocol hangs on Realtek RTL9210B (0bda:9210,
 bcdDevice f0.01)
Message-ID: <2026030817-cupping-reason-0bb9@gregkh>
References: <151d1ec4-275a-43d6-bc06-26e013695b7b@gmx.net>
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On Sun, Mar 08, 2026 at 03:10:54PM +0100, Nils Reuter wrote:
> Hello,
> 
> I would like to report a persistent UAS protocol issue with a Realtek
> RTL9210B based M.2 enclosure.
> 
> *Hardware Environment:*
> 
>  *
> 
>    Enclosure: Ugreen SKU 15813 (Model CM767)
> 
>  *
> 
>    Bridge Chip: Realtek RTL9210B (ID 0bda:9210, bcdDevice f0.01)
> 
>  *
> 
>    Drive: Transcend TS512GMTS430S (SATA M.2)
> 
>  *
> 
>    System: Debian / OpenMediaVault (Linux omv 6.18.12+deb13-amd64)
> 
>  *
> 
>    Kernel: 6.18.12-amd64
> 
> *Problem Description:* Under heavy I/O load (e.g., backup operations), the
> device experience UAS protocol hangs. The kernel log shows multiple
> |uas_eh_abort_handler| events, followed by SCSI read/write errors and a
> device reset (error -71). Eventually, the device is offlined or remounted as
> read-only.
> 
> SMART logs show incrementing UDMA CRC errors (Attribute 199) during these
> events, even though the hardware (cable/SSD) tests fine on other platforms.
> 
> *Logs:*
> 
> |[timestamp] sd 1:0:0:0: [sdb] tag#18 uas_eh_abort_handler 0 uas-tag 15
> inflight: CMD IN [timestamp] usb 2-1-port3: cannot reset (err = -71)
> [timestamp] sd 1:0:0:0: Device offlined - not ready after error recovery |
> 
> *Workaround:* The device works perfectly stable when UAS is disabled via
> usb-storage quirks: |options usb-storage quirks=0bda:9210:u|
> 
> *Request:* Please consider adding this device (0bda:9210 with bcdDevice
> f0.01) to the kernel's UAS quirks list to ensure out-of-the-box stability
> for other users.

Can you submit a patch that adds this quirk to the kernel so you get
credit for adding it?

thanks,

greg k-h