Date: Mon, 22 Jan 2007 14:25:09 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/fs/deadfs dead_vnops.c src/sys/kern vfs_lookup.c Message-ID: <20070122122509.GB71333@deviant.kiev.zoral.com.ua> In-Reply-To: <20070122115230.J82671@maildrop.int.zabbadoz.net> References: <200701221125.l0MBPMS4041567@repoman.freebsd.org> <20070122115230.J82671@maildrop.int.zabbadoz.net>
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--neYutvxvOLaeuPCA Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jan 22, 2007 at 11:53:50AM +0000, Bjoern A. Zeeb wrote: > On Mon, 22 Jan 2007, Konstantin Belousov wrote: >=20 > >kib 2007-01-22 11:25:22 UTC > > > > FreeBSD src repository > > > > Modified files: > > sys/fs/deadfs dead_vnops.c > > sys/kern vfs_lookup.c > > Log: > > Below is slightly edited description of the LOR by Tor Egge: > > > > -------------------------- > > [Deadlock] is caused by a lock order reversal in vfs_lookup(), where > > [some] process is trying to lock a directory vnode, that is the parent > > directory of covered vnode) while holding an exclusive vnode lock on > > covering vnode. > >.... > > To fix the LOR, ups@ noted that when crossing the mount point, ni_dvp > > is actually not used by the callers of namei. Thus, placeholder deadfs > > vnode vp_crossmp is introduced that is filled into ni_dvp. >=20 > which of the LOR #s on "The LOR page" can be marked "patched" with > this commit? >=20 > http://sources.zabbadoz.net/freebsd/lor.html None, your page lists only LORs that are detectable by WITNESS. This one is between lockmgr lock and vfs_busy(), both of them are invisible to WITNESS. --neYutvxvOLaeuPCA Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQFFtK0lC3+MBN1Mb4gRAv6HAJ0cN41/ijkzx+k+izWdJQlUu9JcOgCcDxU2 AUNqBy9O8NEBorGBB1HqspA= =3jUK -----END PGP SIGNATURE----- --neYutvxvOLaeuPCA--
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