[Bug 287165] drm/pseudofs panic in radeonkms.ko

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287165

--- Comment #5 from Steve Kargl <kargl@FreeBSD.org> ---
Looking for closely at dmesg.boot, one finds the initial
reporting for loading radeonkms.ko

  [drm] radeon kernel modesetting enabled.
  drmn0: <drmn> on vgapci0
  vgapci0: child drmn0 requested pci_enable_io
  vgapci0: child drmn0 requested pci_enable_io
  sysctl_add_oid: can't re-use a leaf (hw.dri.debug)!
  [drm] initializing kernel modesetting (CAICOS 0x1002:0x6779 0x1092:0x6450
0x00).

Hmmm, that looks suspicious, and now looking at the qinitial part of core.txt.1

  panic: pfs_add_node(): homonymous siblings

  Reading symbols from /usr/lib/debug//boot/kernel/cpuctl.ko.debug...
  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57
  57              __asm("movq %%gs:%c1,%0" : "=r" (td)
  (kgdb) #0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57

Learned a new word today.

  homonymous /hō-mŏn′ə-məs, hə-/
  adjective

  Having the same name.

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