Lock order reversal [ newbie ] report [2nd one]

Benjamin Kaduk kaduk at mit.edu
Thu Feb 23 03:06:45 UTC 2017


Hi Jeffrey,

Thank you for your enthusiasm in reporting these.
Unfortunately, it is very likely that these two are "well-known" and
believed to be harmless, so you have not discovered something
terribly exciting.

An old and no-longer particularly maintained listing of these and
other LORs is at: http://sources.zabbadoz.net/freebsd/lor.html

-Ben

On Wed, Feb 22, 2017 at 06:20:08PM -0800, Jeffrey Bouquet wrote:
> This one at boot:
> #0 to #10
> bufwait
> /usr/src/sys/kern/vfs_bio.c:3500
> dirhash
> /usr/src/sys/ufs/ufs/ufs_dirhash.c:201
> 
> r313487   12.0-CURRENT Feb 13 2017 
> 1200020  FWIW 
> both the above and the below reports...
> 
> 
> 
> 
> On Wed, 22 Feb 2017 15:37:21 -0800 (PST), "Jeffrey Bouquet" <jbtakk at iherebuywisely.com> wrote:
> 
> > #0 #16 follow:
> > jotted down :
> > 
> > 1. ufs /usr/src/sys/kern/vfs_syscalls.c:3364
> > 2. bufwait /usr/src/sys/ufs/ffs/ffs_vnops.c:280
> > 3. ufs /usr/src/sys/kern/vfs_subr.c:2600
> > 
> > [ took roxterm out of the xinitrc, system stable seems more than yesterday...  too
> > early to tell, which is/was a 2nd issue...  put in urxvt and st... based on TOP memory... ] 
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> 
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