Date: Wed, 11 Jan 2006 15:51:47 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: TSaplin Mikhail <tsmm@list.ru> Cc: freebsd-hackers@freebsd.org Subject: Re: devfs Message-ID: <20060111154939.S28748@fledge.watson.org> In-Reply-To: <200601031847.22199.tsmm@list.ru> References: <200601031847.22199.tsmm@list.ru>
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On Tue, 3 Jan 2006, TSaplin Mikhail wrote: > Hi all i have a problem with devfs device hiding. > My system is FreeBSD 6.0 (i386 and amd64, compiled from last sunday source > (RELENG_6)) > > After mounting defs: > #mount -t devfs devfs /tmp/proba > > first devfs command: > # devfs -m /tmp/proba rule add type disk hide > devfs rule: ioctl DEVFSIO_RADD: Input/output error > > the second command hangs: > # devfs -m /tmp/proba rule add type disk hide > > command doesnt responds on HUP and TERM signals A week or two ago I fixed a bug in devfs where an error condition results in a lock leak, followed by hanging processes and a deadlock. I merged the change to RELENG_6 this morning having returned from India yesterday night. If a fair number of people are running into this, we may want to merge it to RELENG_6_0 and do an errata announcement for it. The change you want is this one: revision 1.21 date: 2006/01/03 09:49:10; author: rwatson; state: Exp; lines: +4 -2 When returning EIO from DEVFSIO_RADD ioctl, drop the exclusive rule lock. Otherwise the system comes to a rather sudden and grinding halt. MFC after: 1 week I ran into it while on travel, as I was trying to get devfs to make /dev/bpf* readable by the operator group, and typed the command wrong. The RELENG_6 revision is devfs_rule.c:1.14.2.3. Robert N M Watson
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