Comment 18 for bug 1749961

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