panic in drm or vt or deadlock on mutex or ...

[Alastair Hogge]

Sorry, please ignore previous reply, the modified sysctl is still
running,
the output earlier, was from the stock binary.

On 2021-02-09 14:25, Alastair Hogge wrote:
> On 2021-02-08 21:01, Hans Petter Selasky wrote:
>> On 2/8/21 1:53 PM, Alastair Hogge wrote:
>>> Boot to multi-user; login (getty):
>>> $ doas kldload /boot/modules/amdgpu.ko
>>> $ sysctl
>>> [panic]
>>>
>>> ..is a guaranteed way to panic my system.
>>
>> Hi,
>>
>> Maybe you could do a hack and edit the sysctl source code:
>>
>> 1) print the sysctl before it is queried.
>> 2) sleep 1 second between print and query.
>>
>> Should be easy to nail this down!
> 
> This is all I am able to catch via the ssh session:
> vm.uma.sackhole.size: 32
> vm.uma.hostcache.stats.xdomain: 0
> vm.uma.hostcache.stats.fails: 0
> vm.uma.hostcache.stats.frees: 0
> vm.uma.hostcache.stats.allocs: 0
> vm.uma.hostcache.stats.current: 0
> vm.uma.hostcache.domain.0.wss: 0
> vm.uma.hostcache.domain.0.imin: 0
> vm.uma.hostcache.domain.0.imax: 0
> vm.uma.hostcache.domain.0.nitems: 0
> vm.uma.hostcache.limit.bucket_max: 7680
> vm.uma.hostcache.limit.sleeps: 0
> vm.uma.hostcache.limit.sleepers: 0
> vm.uma.hostcache.limit.max_items: 15360
> vm.uma.hostcache.limit.items: 0
> vm.uma.hostcache.keg.domain.0.free_items: 0
> vm.uma.hostcache.keg.domain.0.pages: 0
> vm.uma.hostcache.keg.efficiency: 98
> vm.uma.hostcache.keg.reserve: 0
> vm.uma.hostcache.keg.align: 7
> vm.uma.hostcache.keg.ipers: 42
> vm.uma.hostcache.keg.ppera: 1
> vm.uma.hostcache.keg.rsize: 96
> vm.uma.hostcache.keg.name: hostcache
> vm.uma.hostcache.bucket_size_max: 120
> vm.uma.hostcache.bucket_size: 120
> vm.uma.hostcache.flags: 0x43010000<TRASH,LIMIT,CTORDTOR,FIRSTTOUCH>
> vm.uma.hostcache.size: 96
> vm.uma.syncache.stats.xdomain: 0
> vm.uma.syncache.stats.fails: 0
> vm.uma.syncache.stats.frees: 1
> vm.uma.syncache.stats.allocs: 1
> vm.uma.syncache.stats.current: 0
> vm.uma.syncache.domain.0.wss: 3
> vm.uma.syncache.domain.0.imin: 0
> vm.uma.syncache.domain.0.imax: 0
> vm.uma.syncache.domain.0.nitems: 0