login: df4515mod: loaded (DF-4515/DF-4516 primitive driver)
dma_buf_attach: stub
df4515mod: [6] dma_buf_attach -> 0 IS_ERR=0
dma_buf_map_attachment: stub
df4515mod: [6] dma_buf_map_attachment -> -22
df4515mod: [6] goto fail_detach -> dma_buf_detach (drm_prime.c:758): expect panic
panic: dma_buf_attach is not implemented
cpuid = 0
Trace beginning at frame 0xfffff80117adf728
sysctl_fire() at sysctl_fire+0x173 0xffffffff826911c3 
sysctl_fire() at sysctl_fire+0x173 0xffffffff826911c3 
sysctl_root.isra.5() at sysctl_root.isra.5+0x166 0xffffffff80683d06 
userland_sysctl() at userland_sysctl+0x111 0xffffffff806840a1 
sys___sysctl() at sys___sysctl+0x74 0xffffffff80684204 
syscall2() at syscall2+0x11e 0xffffffff80bd6a0e 
Debugger("panic")

CPU0 stopping CPUs: 0x0000003e
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>