On 16.5.2019 16.56, Johan Hovold wrote:
On Thu, May 16, 2019 at 03:35:42PM +0200, StarostaCZ@xxxxxxxxx wrote:
Hello,
when I try to read EEPROM memory from FT232R chip (USB to serial
converter), system crash after a seconds.
You should mention that you're using libusb and the vendor's ftdi
library. Specifically, the kernels ftdi_sio driver is not involved.
1) Configuration
ASUS PRIME A320M-K, latest bios version 4801, default settings.
Ubuntu server 19.04 with kernel 5.1.1-050101-generic:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1.1/
2) lsusboutput
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 04f3:0103 Elan Microelectronics Corp. ActiveJet
K-2024 Multimedia Keyboard
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 0403:6001 Future Technology Devices
International, Ltd FT232 Serial (UART) IC
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
3) kern.log with IOMMU disabled
https://paste.ee/p/nuCPp
Good that you were able to rule out the iommu, but you forgot to CC the
xhci maintainer (added Mathias again).
It could be good idea to include a link to thread with your initial
report as well:
https://lkml.kernel.org/r/04503197-a0a9-8b35-6c65-c10f296aab57@xxxxxxxxx
4) Notes
- problem is, when FT232R is connected to USB2.0 port, when is connected
to USB3 port, this works fine
- another test - same hardware, Debian 9.8 with kernel 4.19 - system
crash too
-- starosta
Including only the obviously relevant part of your log below.
May 16 15:06:45 test-ubnt kernel: [ 0.000000] Linux version 5.1.1-050101-generic (kernel@kathleen) (gcc version 8.3.0 (Ubuntu 8.3.0-12ubuntu1)) #201905110631 SMP Sat May 11 06:33:50 UTC 2019
...
May 16 15:07:03 test-ubnt kernel: [ 30.042564] usbserial: USB Serial deregistering driver FTDI USB Serial Device
May 16 15:07:03 test-ubnt kernel: [ 30.042759] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
May 16 15:07:03 test-ubnt kernel: [ 30.042792] usbcore: deregistering interface driver ftdi_sio
May 16 15:07:03 test-ubnt kernel: [ 30.042842] ftdi_sio 1-9:1.0: device disconnected
May 16 15:07:54 test-ubnt kernel: [ 81.751630] xhci_hcd 0000:01:00.0: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state.
logs and traces from xhci could tell more details about what is going on,
This line indicates a URB cancellation issues.
To get xhci traces and logs please do:
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
< read EEPROM using the usb serial converter >
Send output of dmesg
Send content of /sys/kernel/debug/tracing/trace
-Mathias
