I sent the instructions to one of the users in the bug tracker. Here is the download link for his logs: https://www.sendspace.com/file/413hlj
- Bernhard Am 03.10.19 um 12:23 schrieb Mathias Nyman: > On 2.10.2019 15.28, Bernhard Gebetsberger wrote: >> Hi, >> >> There has been a regression in the xhci driver since kernel version 4.20, on >> some systems some usb devices won't work until the system gets rebooted. >> The error message in dmesg is "WARN Set TR Deq Ptr cmd failed due to >> incorrect slot or ep state", although for some reason there are some usb >> devices that are affected by this issue but don't throw the error >> message(including the device I'm using, I got the error in previous kernel >> versions though). >> It seems like this bug can also lead to system instability, one user >> reported in the bug >> tracker(https://bugzilla.kernel.org/show_bug.cgi?id=202541#c58) that he got >> a system freeze because of this when using kernel 5.3.1. >> > > Ok, lets take a look at this. > Some of the symptoms vary a bit in the report, so lets focus on ones that > show: "WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state" > >> When looking at the responses in the bug tracker, it looks like it mostly >> affects Ryzen based systems with 300 series motherboards, although there are >> some other affected systems as well. It doesn't only affect wifi/bluetooth >> sticks, some users even got this issue when connecting their smartphone or >> their external hard drive to their PC. > >> >> I have uploaded the whole dmesg file and the tracing file to transfer.sh: >> https://transfer.sh/zYohl/dmesg and https://transfer.sh/KNbFL/xhci-trace > > Hmm, trying to download these just shows "Not Found" > > Could someone with a affected system enable tracing and dynamic debug on a > recent kernel, take logs and traces of one failing instance where the message > "WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state" is seen. > > mount -t debugfs none /sys/kernel/debug > echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control > echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control > echo 81920 > /sys/kernel/debug/tracing/buffer_size_kb > echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable > > < Trigger the issue > > > Send output of dmesg > Send content of /sys/kernel/debug/tracing/trace > >> >> The issues occur since commit f8f80be501aa2f10669585c3e328fad079d8cb3a >> "xhci: Use soft retry to recover faster from transaction errors". I think >> this commit should be reverted at least until a workaround has been found, >> especially since the next two kernel versions will be used by a lot of >> distributions(5.4 because it's a LTS kernel and 5.5 will probably be used in >> Ubuntu 20.04) so more users would be affected by this. >> > > There some time left before 5.4 is out, lets see if we can find the root > cause first. > > -Mathias >
