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Subject: [Bug 224176] Lock Order Reversals somewhere in VFS/UFS
Date: Sun, 17 Dec 2017 10:16:48 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224176

Wolfram Schneider <wosch@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wosch@FreeBSD.org

--- Comment #5 from Wolfram Schneider <wosch@FreeBSD.org> ---
I must admit that these LOR kernel message looks scary if you see them for =
the
first time.

But if these messages are mostly harmless, why doesn't we say this?

My proposed change request:

instead:

lock order reversal:
 1st 0xfffffe0000cbf2c0 bufwait (bufwait) @
/home/projects/freebsd/sys/kern/vfs_bio.c:3564
 2nd 0xfffff8001c445800 dirhash (dirhash) @
/home/projects/freebsd/sys/ufs/ufs/ufs_dirhash.c:289
stack backtrace:

we display

lock order reversal (mostly harmless, see
https://www.freebsd.org/doc/handbook/freebsd-glossary.html#lor-glossary )
 1st 0xfffffe0000cbf2c0 bufwait (bufwait) @
/home/projects/freebsd/sys/kern/vfs_bio.c:3564
 2nd 0xfffff8001c445800 dirhash (dirhash) @
/home/projects/freebsd/sys/ufs/ufs/ufs_dirhash.c:289
stack backtrace:

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