[Bug 206923] lock order reversal, vfs_bio.c:3476 ufs_dirhash.c:281

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206923

            Bug ID: 206923
           Summary: lock order reversal, vfs_bio.c:3476 ufs_dirhash.c:281
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: freebsd at tim.thechases.com

I don't have an easy way to capture the back-trace and pull it from the machine
right now, so I've attached a screen-cap and hand-transcribed salient bits:

    witness_debugger+0x70
    witness_checkorder+0xe71
    _sx_xlock+0x72
    ufsdirhash_add+0x3d
    ufs_direnter+0x62f
    ufs_makeinode+0x5f3
    ufs_create+0x2d
    VOP_CREATE_APV+0xf1
    vn_open_cred+0x2f8
    kern_openat+0x25c
    amd64_syscall+0x2db
    Xfast_syscall+0xfb

The system was a fresh install of CURRENT downloaded last night, put on a Dell
Inspiron i1420 with pretty default configuration (one whole disk GPT partition
with a boot, / and swap configuration) mostly just to test some jail stuff. 
Only new packages installed were zip/unzip/bunzip/bunzip2 so I could uncompress
the Handbook (html-split).  It was triggered in /usr/share/doc/handbook/html
(the last two subdirectories being subdirectories I'd created to house the
handbook).  The error was triggered by executing "tar xf book.html-split.tar"

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