Hi Guilherme,

Thanks for the response. I have several (3) quad port ASMedia 2142
PCIe/USB 3.1 cards installed in a Dell R740 rack server.  I am using the
standard Ubuntu 18.04 kernel (Linux dell-PowerEdge-R740
4.15.0-36-generic #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 2018 x86_64
x86_64 x86_64 GNU/Linux).

For one of my applications, it runs a loop that opens and closes a high
speed connection to a USB device connected through the ASMedia board.
After this goes on for several minutes without any issues, I see this in
dmesg:

[Oct 5 10:12] xhci_hcd 0000:be:00.0: WARN Set TR Deq Ptr cmd failed due to 
incorrect slot or ep state.
[  +3.418076] xhci_hcd 0000:be:00.0: WARN Successful completion on short TX
[  +0.000035] xhci_hcd 0000:be:00.0: ERROR Transfer event TRB DMA ptr not part 
of current TD ep_index 12 comp_code 1
[  +0.000003] xhci_hcd 0000:be:00.0: Looking for event-dma 0000001fe9759610 
trb-start 0000001fe9759620 trb-end 0000001fe9759620 seg-start 0000001fe9759000 
seg-end 0000001fe9759ff0

This is then followed shortly after by several kernel dump messages, and
then the whole system starts behaving erratically, requiring a hard
reboot to recover.

The condition is easy for me to reproduce and I will happily provide any
logs that may be of use to help debug this.  Please just let me know
what you would like and how to get them (as I am not a kernel expert).

Thanks,
Roy

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https://bugs.launchpad.net/bugs/1749961

Title:
  xhci_hcd: TRB DMA errors reported with ASMedia ASM1142 USB 3.1
  Controller

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