Re: BTRFS doesn't handle USB device disconnect

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, 10 Dec 2013, Sarah Sharp wrote:

> In order to stress test the uas driver (next-gen USB storage driver), I
> decided to run some tests with a USB 3.0 storage device with four 10GB
> partitions: BTRFS, ext3, ext4, and fat32.
> 
> It seems that BTRFS doesn't handle unexpected USB disconnect very well.
> Is that expected behavior?
> 
> The BTRFS partition was created on an Ubuntu 13.10 system, with
> btrfs-tools version 0.19+20130705-1.
> 
> On 3.12-rc6, if all partitions are mounted, and I yank the USB cable,
> the BTRFS filesystem still shows up as mounted.  If I yank it multiple
> times, sometimes it's listed twice when the device is disconnected:
> 
> /dev/sdb3 on /media/sarah/9f21ef28-0eac-4736-9964-db5378b877e4 type btrfs (rw,nosuid,nodev,uhelper=udisks2)
> /dev/sdc3 on /media/sarah/9f21ef28-0eac-4736-9964-db5378b877e41 type btrfs (rw,nosuid,nodev,uhelper=udisks2)
> 
> Sometimes (but not always) when I plug it back in, I can get /dev/sdc3
> listed twice:
> 
> /dev/sdb3 on /media/sarah/9f21ef28-0eac-4736-9964-db5378b877e4 type btrfs (rw,nosuid,nodev,uhelper=udisks2)
> /dev/sdc3 on /media/sarah/9f21ef28-0eac-4736-9964-db5378b877e42 type btrfs (rw,nosuid,nodev,uhelper=udisks2)
> /dev/sdc1 on /media/sarah/ext3-part type ext3 (rw,nosuid,nodev,uhelper=udisks2)
> /dev/sdc2 on /media/sarah/ext4-part type ext4 (rw,nosuid,nodev,uhelper=udisks2)
> /dev/sdc4 on /media/sarah/fat32-part type vfat (rw,nosuid,nodev,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush,uhelper=udisks2)
> /dev/sdc3 on /media/sarah/9f21ef28-0eac-4736-9964-db5378b877e41 type btrfs (rw,nosuid,nodev,uhelper=udisks2)
> 
> On 3.13-rc1, the btrfs partion from the disconnected USB device
> continues to be listed as mounted.  Yanking the cable produces some
> additional oops messages.  It also produced a couple hard-hangs.
> Unfortunately, I didn't capture the dmesg during the hard-hangs, so I
> can't tell for sure which driver is to blame (uas, btrfs, or xhci).

Does this happen with usb-storage instead of uas?

What about with ehci-hcd instead of xhci-hcd?

And just to be exotic, what about with dummy-hcd and the uas or
g_mass_storage gadget driver?

Alan Stern

--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Linux IIO]     [Samba]     [Device Mapper]
  Powered by Linux