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To: "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org>
From: Eugene Grosbein <eugen@grosbein.net>
Subject: insmntque: non-locked vp
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Date: Fri, 20 Nov 2015 01:45:52 +0700
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Hi!

I'm trying to use mount_nullfs with MIPS32 having option UNIONFS in the kernel.

# mount -t unionfs /mnt/tmp /usr/local
KDB: stack backtrace:
db_trace_thread+30 (?,?,?,?) ra c3b176c000000018 sp 0 sz 0
db_trace_self+1c (?,?,?,?) ra c3b176d800000018 sp 0 sz 0
8008e560+34 (?,?,?,?) ra c3b176f0000001a0 sp 0 sz 0
kdb_backtrace+44 (?,?,?,?) ra c3b1789000000018 sp 0 sz 0
80229860+34 (?,?,?,?) ra c3b178a800000020 sp 0 sz 0
assert_vop_elocked+78 (?,?,?,?) ra c3b178c800000028 sp 0 sz 0
insmntque1+74 (?,?,?,?) ra c3b178f000000028 sp 0 sz 0
insmntque+18 (?,?,?,?) ra c3b1791800000018 sp 0 sz 0
unionfs_nodeget+2c8 (?,?,81794ca8,?) ra c3b1793000000048 sp 0 sz 1
800f9b54+744 (?,?,?,?) ra c3b17978000001b0 sp 0 sz 0
vfs_donmount+1550 (?,?,?,?) ra c3b17b2800000238 sp 0 sz 0
sys_nmount+14c (?,?,?,?) ra c3b17d6000000050 sp 0 sz 0
trap+83c (?,?,?,?) ra c3b17db0000000d0 sp 0 sz 0
MipsUserGenException+e8 (?,?,?,4046bb10) ra c3b17e8000000000 sp 0 sz 0
pid 747
insmntque: non-locked vp: 0x82602438 is not exclusive locked but should be
KDB: enter: lock violation
[ thread pid 747 tid 100048 ]
Stopped at      kdb_enter+0x4c: lui     at,0x8044

Here /mnt/tmp is distinct UFS mounted from USB and /usr/local is just mount point.

Does option UNIONFS require PSEUDOFS? I do not have later in the kernel and
it build and boot just fine, but who known?..