radeonkms on A8-5500 - crashes all the time

Hello.

FreeBSD ratat0sk 12.0-STABLE FreeBSD 12.0-STABLE r349985 MIN  amd64

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 10
fault virtual address   = 0x1728
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff81a7d564
stack pointer           = 0x28:0xfffffe0083258fe0
frame pointer           = 0x28:0xfffffe0083259010
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 3
current process         = 892 (X:rcs0)
trap number             = 12
panic: page fault
cpuid = 0
time = 1563301761
KDB: stack backtrace:
#0 0xffffffff803f1cf7 at kdb_backtrace+0x67
#1 0xffffffff803a861d at vpanic+0x19d
#2 0xffffffff803a8473 at panic+0x43
#3 0xffffffff80677554 at trap_fatal+0x394
#4 0xffffffff806775a9 at trap_pfault+0x49
#5 0xffffffff80676b9f at trap+0x29f
#6 0xffffffff80653f45 at calltrap+0x8
#7 0xffffffff81a95c11 at radeon_sa_bo_new+0x201
#8 0xffffffff81a84b1f at radeon_ib_get+0x2f
#9 0xffffffff81a6f445 at radeon_cs_ioctl+0x295
#10 0xffffffff81b72715 at drm_ioctl_kernel+0xf5
#11 0xffffffff81b729aa at drm_ioctl+0x27a
#12 0xffffffff81bb6e4f at linux_file_ioctl+0x32f
#13 0xffffffff8040f6d7 at kern_ioctl+0x277
#14 0xffffffff8040f3e8 at sys_ioctl+0x158
#15 0xffffffff80678114 at amd64_syscall+0x364
#16 0xffffffff8065482d at fast_syscall_common+0x101

#0  doadump () at src/sys/amd64/include/pcpu.h:234
234             __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" 
(OFFSETOF_CURTHREAD));
(kgdb) #0  doadump () at src/sys/amd64/include/pcpu.h:234
#1  0xffffffff803a8217 in kern_reboot (howto=260)
     at /usr/src/sys/kern/kern_shutdown.c:451
#2  0xffffffff803a8679 in vpanic (fmt=<value optimized out>,
     ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:877
#3  0xffffffff803a8473 in panic (fmt=<value optimized out>)
     at /usr/src/sys/kern/kern_shutdown.c:804
#4  0xffffffff80677554 in trap_fatal (frame=<value optimized out>,
     eva=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:943
#5  0xffffffff806775a9 in trap_pfault (frame=0xfffffe0083258f20, usermode=0)
     at src/sys/amd64/include/pcpu.h:234
#6  0xffffffff80676b9f in trap (frame=0xfffffe0083258f20)
     at /usr/src/sys/amd64/amd64/trap.c:443
#7  0xffffffff80653f45 in calltrap ()
     at /usr/src/sys/amd64/amd64/exception.S:232
#8  0xffffffff81a7d564 in evergreen_default_size ()
    from /boot/kernel/radeonkms.ko
#9  0x0000000000000000 in ?? ()
Current language:  auto; currently minimal

Crash reason: no reason, sitting in slim login slim can grant crash too.

Thanks in advance,

-- 
Sphynx of black quartz judge my vow.
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