[Bug 231884] x11-drivers/xf86-video-ati stops working after update to 18.1.0,1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231884

--- Comment #21 from johan van Zanten <johanvz816 at giantfoo.org> ---
dejacque:/var/crash # pkg info | grep drm
drm-kmod-g20180930             Metaport of DRM modules for the linuxkpi-based
KMS components
drm-stable-kmod-g20180822      DRM modules for the linuxkpi-based KMS
components
libdrm-2.4.93,1                Userspace interface to kernel Direct Rendering
Module services

I've discovered an unpleasant side effect of the fix -- the kernel panics when
i shutdown or reboot.  It's after the "syncing disks" message.


I can upload the vmcore from the crash if that'd be useful. This crash happens
with the GENERIC kernel and a custom kernel i normally run (that removes a lot
of devices not in my laptop). Below is the core.txt from one of the custom
kernel crashes (the traceback is the same with both kernels).  I can upload the
kernel crash dump if that would be helpful.




panic: page fault

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Unread portion of the kernel message buffer:
<118>Stopping devd.
<118>Waiting for PIDS: 352.
<118>Writing entropy file:.
<118>Writing early boot entropy file:.
<118>.
<118>Terminated
<118>Oct  9 22:10:56 dejacque syslogd: exiting on signal 15
Waiting (max 60 seconds) for system process `vnlru' to stop... done
Waiting (max 60 seconds) for system process `bufdaemon' to stop... done
Waiting (max 60 seconds) for system process `syncer' to stop... 
Syncing disks, vnodes remaining... 5 5 4 0 0 done
All buffers synced.
Uptime: 1h22m15s
[drm:cypress_dpm_set_power_state]
rv770_restrict_performance_levels_before_switch failed
VT: Switching back from "fb" to "vga".
vgapci0: REPOSTing


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x2c0
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff8063f042
stack pointer           = 0x28:0xfffffe01e7ce9770
frame pointer           = 0x28:0xfffffe01e7ce9780
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1 (init)
trap number             = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff8064e277 at kdb_backtrace+0x67
#1 0xffffffff80607b97 at vpanic+0x177
#2 0xffffffff80607a13 at panic+0x43
#3 0xffffffff8090447f at trap_fatal+0x35f
#4 0xffffffff809044d9 at trap_pfault+0x49
#5 0xffffffff80903ca7 at trap+0x2c7
#6 0xffffffff808e596c at calltrap+0x8
#7 0xffffffff8184cf50 at backlight_device_unregister+0x150
#8 0xffffffff8166c0e8 at radeon_enc_destroy+0x58
#9 0xffffffff817d0e0b at drm_mode_config_cleanup+0x3b
#10 0xffffffff816fb88b at radeon_modeset_fini+0x11b
#11 0xffffffff81709a8d at radeon_driver_unload_kms+0x3d
#12 0xffffffff817dd229 at drm_dev_unregister+0x39
#13 0xffffffff817dd1c0 at drm_put_dev+0x30
#14 0xffffffff81845249 at linux_pci_shutdown+0x39
#15 0xffffffff80641d0a at bus_generic_shutdown+0x5a
#16 0xffffffff80641d0a at bus_generic_shutdown+0x5a
#17 0xffffffff80641d0a at bus_generic_shutdown+0x5a
Uptime: 1h22m21s
Dumping 496 out of 8034 MB:..4%..13%..23%..33%..42%..52%..62%..71%..81%..91%

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