I found it is quite easy to panic a -current kernel with 2 login windows.

In window 1 do a "tail -f /tmp/world.out"
In window 2 do a "tail -f /tmp/world.out"
In window 2 do "^C" to break out of tail -f
In window 1 do "^C" to break out of tail -f
The box panic immediately.

I can't get a coredump at the moment because the kernel just stops while
doing the "syncing disks... 7 7"...

Maybe it is related to kern/25309?

Fatal trap 12: page fault while in kernel mode
cpuid = 1; lapic.id = 00000000
fault virtual address   = 0x0
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc023175a
stack pointer           = 0x10:0xc8fe5db4
frame pointer           = 0x10:0xc8fe5dc0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 347 (tail)
trap number             = 12
panic: page fault
cpuid = 1; lapic.id = 00000000
boot() called on cpu#1

syncing disks... 7 7 

c02312e8 t ufs_advlock
c0231310 T ufs_vinit
c02313bc t ufs_makeinode
c023159c t ufs_missingop
c02315b4 t ufs_kqfilter
c02316d4 t filt_ufsdetach
c02317dc t filt_ufsread
c0231808 t filt_ufsvnode
c023182c T ufs_vnoperate


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