This is 10days old kernel panic, the same type I report before, but now I
use dont-sync-on-panic sysctl, so some stack trace finally available:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x24
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc017fdab
stack pointer = 0x10:0xcd36bb04
frame pointer = 0x10:0xcd36bb18
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 = 3 (g_up)
trap number = 12
panic: page fault
#0 0xc018a4bb in doadump ()
#1 0xc018ab44 in boot ()
#2 0xc018aee8 in panic ()
#3 0xc02992dc in trap_fatal ()
#4 0xc0298983 in trap ()
#5 0xc02897d8 in calltrap ()
#6 0xc01801f9 in _mtx_lock_sleep ()
#7 0xc01d3fac in bufdone ()
#8 0xc01d7e78 in cluster_callback ()
#9 0xc01d3f11 in bufdone ()
#10 0xc01d3d8e in bufdonebio ()
#11 0xc01d3b5c in biodone ()
#12 0xc01520ba in g_dev_done ()
#13 0xc01d3b5c in biodone ()
#14 0xc0154d28 in g_io_schedule_up ()
#15 0xc0154f38 in g_up_procbody ()
#16 0xc0173b51 in fork_exit ()
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