dmesg synchronizing error when removing closed flash drive

[Colin Law]

On Sun, 27 Jul 2025, 14:21 Mike Marchywka, <marchywka at hotmail.com> wrote:

> I have been using flash drives via a USB extender and recently noticed
> an error on 2 systems now, most recently Ubuntu 25. The data seem ok
> and no messages occur during umount or remount that suggest a problem.
> Then I turn off the power ( the USB extended has switches for each slot )
> or pull the flash drive I get something like this, see the last 2 entries,
>

Did you unmount the drive before pulling it?

Colin L.


>
>
> [10715.226456] usb 2-1.1.1.1: new SuperSpeed USB device number 6 using
> xhci_hcd
> [10717.466704] usb 2-1.1.1.1: New USB device found, idVendor=0781,
> idProduct=55a3, bcdDevice= 1.00
> [10717.466715] usb 2-1.1.1.1: New USB device strings: Mfr=1, Product=2,
> SerialNumber=3
> [10717.466718] usb 2-1.1.1.1: Product:  SanDisk 3.2Gen1
> [10717.466720] usb 2-1.1.1.1: Manufacturer:  USB
> [10717.466722] usb 2-1.1.1.1: SerialNumber: 03021519072324025456
> [10717.474732] scsi host6: uas
> [10717.476123] scsi 6:0:0:0: Direct-Access      USB      SanDisk 3.2Gen1
> 1.00 PQ: 0 ANSI: 7
> [10717.578498] sd 6:0:0:0: Attached scsi generic sg0 type 0
> [10717.584154] sd 6:0:0:0: [sda] 488570880 512-byte logical blocks: (250
> GB/233 GiB)
> [10717.585106] sd 6:0:0:0: [sda] Write Protect is off
> [10717.585111] sd 6:0:0:0: [sda] Mode Sense: 43 00 00 00
> [10717.585520] sd 6:0:0:0: [sda] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [10717.610632] sd 6:0:0:0: [sda] Preferred minimum I/O size 4096 bytes
> [10717.624011]  sda: sda1
> [10717.624115] sd 6:0:0:0: [sda] Attached SCSI removable disk
> [10887.613788]  sda: sda1
> [10887.627333]  sda: sda1
> [10943.835928] EXT4-fs (sda1): mounted filesystem
> 547cd32d-bffe-4dcd-94ef-d76fc25acaab r/w with ordered data mode. Quota
> mode: none.
> [10968.105138] EXT4-fs (sda1): unmounting filesystem
> 547cd32d-bffe-4dcd-94ef-d76fc25acaab.
> [10975.611623] usb 2-1.1.1.1: USB disconnect, device number 6
> [10975.634286] sd 6:0:0:0: [sda] Synchronizing SCSI cache
> [10975.797285] sd 6:0:0:0: [sda] Synchronize Cache(10) failed: Result:
> hostbyte=DID_ERROR driverbyte=DRIVER_OK
>
>
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