Re: [UDL] general protection fault in fb_deferred_io_mkwrite()

[Bernie Thompson <bernie@xxxxxxxxxxxx>]

On Sun, Aug 12, 2012 at 3:34 AM, Thomas Meyer <thomas@xxxxxxxx> wrote:

guilty driver is probably udl_fb.c
any ideas?

Hi Thomas,

We were seeing similar issues in udlfb (the original fbdev version of this driver), which were fixed earlier this year by getting all rendering operations out of probe/disconnect -- those which might trigger fb_defio page faults in an inappropriate context, or be long-running. Here's some more detail:

http://plugable.com/2012/06/21/displaylink-usb-devices-on-linux-kernel-3-4-0/comment-page-1/#comment-5896 

Unfortunately, I haven't had time to get going with udl myself, so haven't been able to port and confirm.  Thanks for raising and staying on this.

Best wishes,

Bernie 

[   45.633336] RIP  [<ffffffff8123becc>] fb_deferred_io_mkwrite+0xdc/0xf0
[   45.633336]  RSP <ffff880126559c98>
[   45.711547] ---[ end trace d4732d5a0bf375fb ]---
[   45.720961] released /dev/fb1 user=1 count=0

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