Date: Tue, 23 Jan 2001 23:24:55 -0800 (PST) From: "Crist J. Clark" <cjc@rfx-216-196-73-168.users.reflexcom.com> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/24592: dmesg.boot Gets Overwritten without Reboot Message-ID: <200101240724.f0O7Otw46375@rfx-216-196-73-168.users.reflexcom.com>
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>Number: 24592
>Category: bin
>Synopsis: dmesg.boot Gets Overwritten without Reboot
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jan 23 23:30:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Crist J. Clark
>Release: FreeBSD 4.2-STABLE i386
>Organization:
>Environment:
Observed on FreeBSD 4.2-STABLE, but older versions and
5.0-CURRENT are also affected.
>Description:
The file containing the kernel boot messages,
/var/run/dmesg.boot, will be overwritten when a user drops into
single-user mode and comes back up into multi-user without a reboot.
>How-To-Repeat:
Drop into single-user mode and then go right back to
multi-user. Do not reboot.
# ls -l /var/run/dmesg.boot
-rw-r--r-- 1 root wheel 3623 Jan 17 19:35 /var/run/dmesg.boot
# shutdown now
<shutdown messages>
Enter full pathname of shell or RETURN for /bin/sh:
# exit
<startup, NOT boot, output>
# ls -l /var/run/dmesg.boot
-rw-r--r-- 1 root wheel 11188 Jan 23 22:05 /var/run/dmesg.boot
>Fix:
Writing dmesg.boot is in the clean_var funnction of /etc/rc. I
am not familiar enough with init(8) and rc(8) to figure out how to let
/etc/rc know if we are going into multi-user after a fresh reboot or
from single-user without a recent reboot. I see a problem in telling
the difference between,
reboot -> single-user -> multi-user
Versus,
multi-user -> single-user -> multi-user
That is, what state information can survive the single-user stage.
>Release-Note:
>Audit-Trail:
>Unformatted:
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