sudo gdb -p 4495
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Attaching to process 4495
[New LWP 4496]
[New LWP 4497]
[New LWP 4498]
[New LWP 4499]
[New LWP 4500]
[New LWP 4501]
[New LWP 4502]
[New LWP 4503]
[New LWP 4504]
[New LWP 4505]
[New LWP 4506]
[New LWP 4507]
[New LWP 4508]
[New LWP 4509]
[New LWP 4510]
[New LWP 4511]
[New LWP 4512]
[New LWP 4513]
[New LWP 4514]
[New LWP 4515]
[New LWP 4516]
[New LWP 4517]
[New LWP 4518]
[New LWP 4519]
[New LWP 4520]
[New LWP 4521]
[New LWP 4522]
[New LWP 4523]
[New LWP 4524]
[New LWP 4525]
[New LWP 4526]
[New LWP 4527]
[New LWP 4528]
[New LWP 4529]
[New LWP 4530]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
0x00007f5e987b641e in epoll_wait () from /usr/lib/libc.so.6
(gdb) break drmModeConnectorSetProperty
Breakpoint 1 at 0x7f5e988bde20
(gdb) break drmModeObjectSetProperty
Breakpoint 2 at 0x7f5e988be9d0
(gdb) continue
Continuing.

Thread 1 "Xorg" hit Breakpoint 2, 0x00007f5e988be9d0 in drmModeObjectSetProperty () from /usr/lib/libdrm.so.2
(gdb) bt
#0  0x00007f5e988be9d0 in drmModeObjectSetProperty () at /usr/lib/libdrm.so.2
#1  0x00007f5e993043f0 in  () at /usr/lib/xorg/modules/drivers/amdgpu_drv.so
#2  0x00007f5e99305a44 in  () at /usr/lib/xorg/modules/drivers/amdgpu_drv.so
#3  0x00007f5e99305af5 in  () at /usr/lib/xorg/modules/drivers/amdgpu_drv.so
#4  0x0000558a8b1709db in  ()
#5  0x0000558a8b142e7a in  ()
#6  0x0000558a8b080da5 in  ()
#7  0x0000558a8b04b899 in  ()
#8  0x0000558a8b04e16d in  ()
#9  0x0000558a8b052473 in  ()
#10 0x00007f5e986e0ee3 in __libc_start_main () at /usr/lib/libc.so.6
#11 0x0000558a8b01575e in _start ()
(gdb)