10.0_BETA/amd64 panic in inteldrm

["John D. Baker" <jdbaker%consolidated.net@localhost>]

This just happened about a half hour ago (01:30 CDT, 24 Sep 2023).
I had updated to the latest 10.0_BETA just a few hours before.
The panic message was still in the message buffer when the machine
rebooted:

[...]
[ 16820.184971] panic: kernel diagnostic assertion "!(((tail) & ~(uintmax_t)((64) - 1)) == ((ring->head) & ~(uintmax_t)((64) - 1)) && tail < ring->head)" failed: file "/x/netbsd-10/src/sys/external/bsd/drm2/dist/drm/i915/gt/intel_ring.h", line 110 
[ 16820.184971] cpu1: Begin traceback...
[ 16820.184971] vpanic() at netbsd:vpanic+0x183
[ 16820.184971] kern_assert() at netbsd:kern_assert+0x4b
[ 16820.184971] i9xx_submit_request() at netbsd:i9xx_submit_request+0xd1
[ 16820.184971] submit_notify() at netbsd:submit_notify+0x5e
[ 16820.184971] __i915_sw_fence_complete() at netbsd:__i915_sw_fence_complete+0x3a
[ 16820.184971] i915_request_add() at netbsd:i915_request_add+0xe7
[ 16820.184971] i915_gem_do_execbuffer() at netbsd:i915_gem_do_execbuffer+0x15e5
[ 16820.184971] i915_gem_execbuffer2_ioctl() at netbsd:i915_gem_execbuffer2_ioctl+0x1f9
[ 16820.194972] drm_ioctl() at netbsd:drm_ioctl+0x23d
[ 16820.194972] drm_ioctl_shim() at netbsd:drm_ioctl_shim+0x37
[ 16820.194972] sys_ioctl() at netbsd:sys_ioctl+0x56d
[ 16820.194972] syscall() at netbsd:syscall+0x196
[ 16820.194972] --- syscall (number 54) ---
[ 16820.194972] netbsd:syscall+0x196:
[ 16820.194972] cpu1: End traceback...

[ 16820.194972] dumping to dev 0,1 (offset=16867127, size=2086023):
[ 16820.194972] dump <<new dmesg begins>>


I have the core dump if more info is needed.

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