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geekuillaume

Member

Registered: 2019-07-15

Posts: 2

Bluetoothd random segfault on mouse connection

Hello,
On my Lenovo X1 Extreme Gen2, the bluetoothd process segfault frequently on mouse connection. The bluetooth chipset is integrated in the Intel Corporation Wi-Fi 6 AX200 card. I'm using the latest Linux kernel (5.5.4) and bluez-git (bluez-git-1:5.53.r4.g17516034a).
Here's the stacktrace from the coredump:

#0  queue_remove (queue=0x55e521458c90, data=data@entry=0x55e521454510) at src/shared/queue.c:258
#1  0x000055e51fde63fe in enable_ccc_callback (opcode=<optimized out>, pdu=<optimized out>, length=<optimized out>, user_data=0x55e521454510) at src/shared/gatt-client.c:1559
#2  0x000055e51fde157c in disc_att_send_op (data=0x55e521454b20) at src/shared/att.c:547
#3  0x000055e51fddd802 in queue_remove_all (queue=0x55e52144da10, function=function@entry=0x0, user_data=user_data@entry=0x0, destroy=destroy@entry=0x55e51fde1560 <disc_att_send_op>) at src/shared/queue.c:354
#4  0x000055e51fde285a in disconnect_cb (io=<optimized out>, user_data=0x55e521447330) at src/shared/att.c:576
#5  0x000055e51fded0d5 in watch_callback (channel=<optimized out>, cond=<optimized out>, user_data=<optimized out>) at src/shared/io-glib.c:170
#6  0x00007fbccc71726f in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#7  0x00007fbccc7191b1 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fbccc71a0c3 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#9  0x000055e51fded6d6 in mainloop_run () at src/shared/mainloop-glib.c:79
#10 0x000055e51fdedb58 in mainloop_run_with_signal (func=<optimized out>, user_data=0x0) at src/shared/mainloop-notify.c:201
#11 0x000055e51fd56909 in main (argc=<optimized out>, argv=<optimized out>) at src/main.c:756

The syslog also adds these line just before the segfault:

Feb 19 09:12:49 geekuillaume-laptop bluetoothd[1189]: Read Report Reference descriptor failed: Request attribute has encountered an unlikely error
Feb 19 09:12:49 geekuillaume-laptop bluetoothd[1189]: Read Report Reference descriptor failed: Request attribute has encountered an unlikely error
Feb 19 09:12:49 geekuillaume-laptop bluetoothd[1189]: Protocol Mode characteristic read failed: Request attribute has encountered an unlikely error

The mouse is a Logitech MX Master 2 which has no problem on Windows with the same laptop. I have a keyboard (Keychron K2) connected by Bluetooth before the crash. If I restart the bluetoothd process with systemctl, the mouse reconnects and it works fine.

There is another issue with the mouse that could be related: sometimes, the mouse stops working and a lot of "bt_uhid_send: Invalid argument (22)" are logged to the syslog. After 10 seconds it goes back to working fine.

What to do to debug this?

Thanks.