[Bug 248250] Witness Warning: 'Exclusive Sleep Mutex vtdev locked' warning on arm64 (RPi4b)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248250

            Bug ID: 248250
           Summary: Witness Warning: 'Exclusive Sleep Mutex vtdev locked'
                    warning on arm64 (RPi4b)
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: gbe at FreeBSD.org

While booting the RPi4b I get the following warning:

uma_zalloc_debug: zone "kenv" with the following non-sleepable locks held:
exclusive sleep mutex vtdev (vtdev) r = 0 (0xffff0000009b4280) locked @
/tank/nfs_public/tiny/src/sys/dev/vt/vt_core.c:2818
stack backtrace:
#0 0xffff00000048f2d8 at witness_debugger+0x64
#1 0xffff0000004902e8 at witness_warn+0x3f0
#2 0xffff000000690620 at uma_zalloc_debug+0x2c
#3 0xffff000000690088 at uma_zalloc_arg+0x2c
#4 0xffff0000003d3498 at getenv_string_buffer+0x40
#5 0xffff0000003d3bb4 at getenv_quad+0x14
#6 0xffff0000003d3b84 at getenv_int+0x14
#7 0xffff0000002d40a4 at vt_fb_init+0xbc
#8 0xffff0000002d8f50 at vt_replace_backend+0x10c
#9 0xffff0000002d41dc at vt_fb_attach+0x14
#10 0xffff00000019de28 at fbd_register+0xec
#11 0xffff00000045c850 at device_attach+0x400
#12 0xffff00000045c3b8 at device_probe_and_attach+0x7c
#13 0xffff0000006eefa8 at bcm_fb_attach+0x280
#14 0xffff00000045c850 at device_attach+0x400
#15 0xffff00000045c3b8 at device_probe_and_attach+0x7c
#16 0xffff00000045e59c at bus_generic_new_pass+0xf8
#17 0xffff00000045e54c at bus_generic_new_pass+0xa8
fb0: 1824x984(1824x984 at 0,0) 32bpp

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