[Bug 266098] dtrace: error on enabled probe ID 2 (ID 79710: io:kernel:none:start): invalid address (0x20) in action #4 at DIF offset 16

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 29 Aug 2022 17:21:07 UTC

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
                 CC|                            |markj@FreeBSD.org
           Assignee|bugs@FreeBSD.org            |markj@FreeBSD.org

--- Comment #1 from Mark Johnston <markj@FreeBSD.org> ---
It's because there is a io:::start probe in devstat_start_transaction(), but
there is no BIO to reference.  I'll commit a patch to remove those probes,
since I don't think they're very useful.

BTW, this script isn't going to give you much information on FreeBSD.  The io
probes are too "deep" in the I/O path to retain any association with the
process that initiated the I/O.  That is, "execname" will not tell you much. 
In some cases it might, but that depends on the filesystem and GEOM providers
in use.

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