Date: Mon, 21 Apr 2014 16:52:28 -0400 (EDT) From: Benjamin Kaduk <kaduk@MIT.EDU> To: "R. Tyler Croy" <tyler@monkeypox.org> Cc: freebsd-current@freebsd.org Subject: Re: UFS lock order reversal stack trace with r264677 on i386 Message-ID: <alpine.GSO.1.10.1404211649570.21026@multics.mit.edu> In-Reply-To: <5353249E.60304@monkeypox.org> References: <5353249E.60304@monkeypox.org>
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On Sat, 19 Apr 2014, R. Tyler Croy wrote: > I've noticed this as of late on my i386 -CURRENT Thinkpad T43 when I perform > some file operations, but an exact reproduction case I've not yet stumbled > upon: > > Apr 20 01:29:32 lemon kernel: lock order reversal: > Apr 20 01:29:32 lemon kernel: 1st 0xc5832358 bufwait (bufwait) @ > /usr/home/tyler/source/github/freebsd/sys/kern/vfs_bio.c:3081 > Apr 20 01:29:32 lemon kernel: 2nd 0xc6f1d600 dirhash (dirhash) @ > /usr/home/tyler/source/github/freebsd/sys/ufs/ufs/ufs_dirhash.c:284 [...] > Apr 20 01:29:54 lemon kernel: lock order reversal: > Apr 20 01:29:54 lemon kernel: 1st 0xc699e388 ufs (ufs) @ > /usr/home/tyler/source/github/freebsd/sys/kern/vfs_subr.c:2101 > Apr 20 01:29:54 lemon kernel: 2nd 0xc5859e98 bufwait (bufwait) @ > /usr/home/tyler/source/github/freebsd/sys/ufs/ffs/ffs_vnops.c:262 > Apr 20 01:29:54 lemon kernel: 3rd 0xc7d27c68 ufs (ufs) @ > /usr/home/tyler/source/github/freebsd/sys/kern/vfs_subr.c:2101 These are "well known", #261 and #285 at http://sources.zabbadoz.net/freebsd/lor.html . -Ben Kaduk
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