[Bug 291002] ZFS error created on otherwise running and sane system.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291002

--- Comment #6 from David Gilbert <dave@daveg.ca> ---
I'm continuing to see crashes.  Here's a bit of the core dump (so people don't
have to open the file) from core dump #1:

#5  0xffffffff8107bb98 in trap_fatal (frame=0xfffffe015c0dd910, 
    eva=<optimized out>) at /usr/src/sys/amd64/amd64/trap.c:969
        type = <optimized out>
        handled = <optimized out>
#6  <signal handler called>
No locals.
#7  pctrie_node_load (p=p@entry=0x80000000000048, smr=0x0, 
    access=PCTRIE_LOCKED) at /usr/src/sys/kern/subr_pctrie.c:123
No locals.
#8  pctrie_root_load (ptree=ptree@entry=0x80000000000048, smr=0x0, 
    access=PCTRIE_LOCKED) at /usr/src/sys/kern/subr_pctrie.c:164
No locals.
#9  _pctrie_lookup_node (ptree=ptree@entry=0x80000000000048, node=0x0, 
    index=16045693110842147038, smr=0x0, access=PCTRIE_LOCKED, 
    parent_out=<optimized out>) at /usr/src/sys/kern/subr_pctrie.c:299
        parent = 0x0
        slot = <optimized out>

Now... Core dump #2 has something that might mean it's a different bug.  It
might just be the system trying to deal with zfs corruption caused by #1.

However, this just occurred last night (uploaded as core dump #3):

#5  0xffffffff81079b98 in trap_fatal (frame=0xfffffe015c0dd910, 
    eva=<optimized out>) at /usr/src/sys/amd64/amd64/trap.c:969
        type = <optimized out>
        handled = <optimized out>
#6  <signal handler called>
No locals.
#7  pctrie_node_load (p=p@entry=0x80000000000048, smr=0x0, 
    access=PCTRIE_LOCKED) at /usr/src/sys/kern/subr_pctrie.c:123
No locals.
#8  pctrie_root_load (ptree=ptree@entry=0x80000000000048, smr=0x0, 
    access=PCTRIE_LOCKED) at /usr/src/sys/kern/subr_pctrie.c:164
No locals.
#9  _pctrie_lookup_node (ptree=ptree@entry=0x80000000000048, node=0x0, 
    index=16045693110842147038, smr=0x0, access=PCTRIE_LOCKED, 
    parent_out=<optimized out>) at /usr/src/sys/kern/subr_pctrie.c:299
        parent = 0x0
        slot = <optimized out>

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