[CentOS-virt] USB card reader causing qemu-kvm SEGV's

Philip Prindeville philipp_subx at redfish-solutions.com
Sun Mar 12 22:41:27 UTC 2017


Hi.

I have a Supermicro 5018D-FN4T (Xeon D-1541 based SBC) that I use for virtualization.  I’m running Centos 7.3 on it (updated), with the CentOS-QEMU-EV.repo repository as the source for virtualization packages.

I run an Ubuntu 16.04-2 guest VM on it, which is ordinary enough.  What’s perhaps less ordinary is that I’ve attached a Lexar Media, Inc. “Lexar Professional Workflow CR1 CFast 2.0 USB 3.0 Reader” (LRWCR1TBNA) as well as a WEme Superspeed Aluminum USB 3.0 Multi-in-1 Card Reader … for CF/SD/TF Micro SD.  Here’s the relevant lsusb output:

Bus 004 Device 004: ID 0bda:0309 Realtek Semiconductor Corp. 
Bus 004 Device 025: ID 05dc:ba04 Lexar Media, Inc.

and both are hanging off of an Amazon Basics 4-port USB 3.0 hub:

Bus 004 Device 002: ID 2109:8110 VIA Labs, Inc. Hub

The Ubuntu VM I use for doing buildroot cross builds of an embedded Linux environment, which I then burn the image of onto a CFast card, having attached the Lexar card reader to the guest VM.

Problem is that the card reader is extremely dodgy, and sometimes I guess a flurry of messages on the virtualization host complaining about the device:

Mar 11 15:52:46 kvm1 kernel: usb 4-2.2: Disable of device-initiated U1 failed.
Mar 11 15:52:46 kvm1 kernel: usb 4-2.2: Disable of device-initiated U2 failed.
Mar 11 15:52:46 kvm1 kernel: usb 4-2.2: Set SEL for device-initiated U1 failed.
Mar 11 15:52:46 kvm1 kernel: usb 4-2.2: Set SEL for device-initiated U2 failed.
Mar 11 15:52:47 kvm1 kernel: usb 4-2.2: reset SuperSpeed USB device number 25 using xhci_hcd
Mar 11 15:52:47 kvm1 kernel: scsi host13: uas
Mar 11 15:52:47 kvm1 kernel: scsi 13:0:0:0: Direct-Access     Lexar    WorkflowCR1      0    PQ: 0 ANSI: 6
Mar 11 15:52:47 kvm1 kernel: sd 13:0:0:0: [sda] 30198988 512-byte logical blocks: (15.4 GB/14.3 GiB)
Mar 11 15:52:47 kvm1 kernel: sd 13:0:0:0: Attached scsi generic sg0 type 0
Mar 11 15:52:47 kvm1 kernel: sd 13:0:0:0: [sda] Write Protect is off
Mar 11 15:52:47 kvm1 kernel: sd 13:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
Mar 11 15:52:47 kvm1 kernel: sda: sda1 sda2
Mar 11 15:52:47 kvm1 kernel: sd 13:0:0:0: [sda] Attached SCSI removable disk
Mar 11 15:52:48 kvm1 kernel: usb 4-2.2: usbfs: process 4354 (CPU 3/KVM) did not claim interface 0 before use
Mar 11 15:52:48 kvm1 kernel: usb 4-2.2: usbfs: process 4354 (CPU 3/KVM) did not claim interface 0 before use
Mar 11 15:53:21 kvm1 kernel: usb 4-2.2: usbfs: process 4355 (CPU 4/KVM) did not claim interface 0 before use
Mar 11 15:53:21 kvm1 kernel: usb 4-2.2: reset SuperSpeed USB device number 25 using xhci_hcd
Mar 11 15:53:21 kvm1 kernel: usb 4-2.2: reset SuperSpeed USB device number 25 using xhci_hcd


but lately it just kills my VM when I’m writing to the device.  So from annoying to a serious potential for losing work.

I run “yum update” a couple of times a week but now I’m thinking that was a mistake, since this has gone from being ultra-reliable to being a hazard.

Is there a workaround?  Would I be better off plugging the USB 3.0 card-reader into a USB 2.0 hub and settling for slower throughput… but not crashing?

Below, for instance, I was doing a “dd if=xyzzy of=/dev/sda bs=1M” where /dev/sda is the device assigned to the USB card storage device.

Thanks,

-Philip


URL for ABRT report:  https://da.gd/emJO




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