Re: System hangs when using USB 3.0 HD with on Ubuntu

Jonas Schwertfeger
2010-05-11T06:54:57Z

On 05/07/2010 05:03 PM, Alan Stern wrote:
> Hmm. I'm not sure I believe this data. For a while (starting with
> 2.6.33) the usbmon implementation didn't work right with EHCI -- it
> looked in the transfer buffer before the DMA-unmapping was done, so on
> a system with>= 4 GB of memory it wouldn't always see the data. The
> fix for this was merged only within the last week or so.
>
> Can you repeat the USB-2.0 test but this time doing "rmmod ehci-hcd"
> beforehand?

I could not remove that module (I assume it is compiled into the kernel)
so I limited the memory the kernel can see to 1GB. You were right, now
there is actually useful data in the trace. Here it is:

ffff88001bb82840 685088867 S Bo:1:003:2 -115 31 = 55534243 c9000000
00020000 80001085 082e0000 00010000 00000000 40ec00
ffff88001bb82840 685088982 C Bo:1:003:2 0 31 >
ffff88001bbc3d80 685089045 S Bi:1:003:1 -115 512 <
ffff88001bbc3d80 685094708 C Bi:1:003:1 0 512 = 4000ff3f 37c81000
00000000 3f000000 00000000 32534d35 394a5a30 30313237
ffff88001bb82840 685094763 S Bi:1:003:1 -115 13 <
ffff88001bb82840 685094814 C Bi:1:003:1 0 13 = 55534253 c9000000 00000000 00
ffff88001bb82840 685095024 S Bo:1:003:2 -115 31 = 55534243 ca000000
00020000 80001085 082e0000 00010000 00000000 40a100
ffff88001bb82840 685095207 C Bo:1:003:2 0 31 >
ffff88001bbc3d80 685095260 S Bi:1:003:1 -115 512 <
ffff88001bbc3d80 685095457 C Bi:1:003:1 -32 0
ffff88001bb82840 685095509 S Co:1:003:0 s 02 01 0000 0081 0000 0
ffff88001bb82840 685095561 C Co:1:003:0 0 0
ffff88001bb82840 685095614 S Bi:1:003:1 -115 13 <
ffff88001bb82840 685095699 C Bi:1:003:1 0 13 = 55534253 ca000000 00020000 01
ffff88001bb82840 685095768 S Bo:1:003:2 -115 31 = 55534243 cb000000
60000000 80000603 00000060 00000000 00000000 000000
ffff88001bb82840 685095817 C Bo:1:003:2 0 31 >
ffff88001bbc3d80 685095885 S Bi:1:003:1 -115 96 <
ffff88001bbc3d80 685096082 C Bi:1:003:1 0 96 = 720b0000 0000000e
090c0004 00010000 00000000 40510000 00000000 00000000
ffff88001bb82840 685096136 S Bi:1:003:1 -115 13 <
ffff88001bb82840 685096207 C Bi:1:003:1 0 13 = 55534253 cb000000 00000000 00
ffff88001bb82840 685097822 S Bo:1:003:2 -115 31 = 55534243 cc000000
00100000 80000a28 00000000 00000008 00000000 000000
ffff88001bb82840 685097947 C Bo:1:003:2 0 31 >
ffff880010e52a80 685098002 S Bi:1:003:1 -115 4096 <
ffff880010e52a80 685106944 C Bi:1:003:1 0 4096 = fab80010 8ed0bc00
b0b80000 8ed88ec0 fbbe007c bf0006b9 0002f3a4 ea210600
ffff88001bb82840 685106999 S Bi:1:003:1 -115 13 <
ffff88001bb82840 685107075 C Bi:1:003:1 0 13 = 55534253 cc000000 00000000 00

-Jonas