solaris assert: (dn->dn_id_flags & DN_ID_NEW_EXIST) == 0

[Xin Li]

Not sure how this was triggered (yet; this is mostly an idle system) but
will try to find out.

Known good revision: r352698M FreeBSD clang version 8.0.1
(tags/RELEASE_801/final 366581) (based on LLVM 8.0.1)

Current revision that exhibits the issue: r353450M FreeBSD clang version
9.0.0 (tags/RELEASE_900/final 372316) (based on LLVM 9.0.0)

===

Unread portion of the kernel message buffer:
panic: solaris assert: (dn->dn_id_flags & DN_ID_NEW_EXIST) == 0, file:
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c, line: 524
cpuid = 7
time = 1570907936
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame
0xfffffe01021e4230
vpanic() at vpanic+0x1c7/frame 0xfffffe01021e42a0
panic() at panic+0x43/frame 0xfffffe01021e4300
assfail() at assfail+0x1a/frame 0xfffffe01021e4310
dnode_destroy() at dnode_destroy+0x56/frame 0xfffffe01021e4350
dnode_hold_impl() at dnode_hold_impl+0x1467/frame 0xfffffe01021e4450
dmu_object_alloc_impl() at dmu_object_alloc_impl+0x438/frame
0xfffffe01021e4550
zfs_mknode() at zfs_mknode+0x2e3/frame 0xfffffe01021e46a0
zfs_freebsd_create() at zfs_freebsd_create+0x95f/frame 0xfffffe01021e4780
VOP_CREATE_APV() at VOP_CREATE_APV+0x8b/frame 0xfffffe01021e47b0
vn_open_cred() at vn_open_cred+0x521/frame 0xfffffe01021e4910
kern_openat() at kern_openat+0x2f3/frame 0xfffffe01021e4a90
filemon_wrapper_openat() at filemon_wrapper_openat+0x20/frame
0xfffffe01021e4ac0
amd64_syscall() at amd64_syscall+0x44b/frame 0xfffffe01021e4bf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe01021e4bf0
--- syscall (499, FreeBSD ELF64, filemon_wrapper_openat), rip =
0x80047ee4a, rsp = 0x7fffffffa868, rbp = 0x7fffffffadb0 ---
Uptime: 43m42s
Dumping 3805 out of 32709
MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

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