Date: Tue, 7 Oct 2008 12:16:13 GMT From: pluknet <pluknet@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/127917: [patch] dumpon rejects on start with physmem>swap even with minidump=1 Message-ID: <200810071216.m97CGDHm014430@www.freebsd.org> Resent-Message-ID: <200810071220.m97CK2jU095867@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 127917 >Category: misc >Synopsis: [patch] dumpon rejects on start with physmem>swap even with minidump=1 >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 Oct 07 12:20:02 UTC 2008 >Closed-Date: >Last-Modified: >Originator: pluknet >Release: 6.2-R >Organization: RIPN >Environment: FreeBSD jaw.ripn.net 6.2-RELEASE-p12 FreeBSD 6.2-RELEASE-p12 #86: Tue Oct 7 15:43:58 MSD 2008 root@jaw.ripn.net:/usr/obj/usr/src/sys/JAW i386 >Description: Minidump feature allows to dump kcore even with physical memory less than size of a swap device. $ sysctl debug.minidump=0 debug.minidump: 1 -> 0 $ /etc/rc.d/dumpon start /dev/ad0s1b is smaller than physical memory $ sysctl debug.minidump=1 debug.minidump: 0 -> 1 $ /etc/rc.d/dumpon start kernel dumps on /dev/ad0s1b All right. But it does not always work on boot (of course, with properly set debug.minidump=1 in /etc/sysctl.conf) and we have on boot: /dev/ad0s1b is smaller than physical memory. >How-To-Repeat: Get a lesser swap slice then phys memory size. Set sysctl debug.minidump=1 in /etc/sysctl.conf Place dumpdev="/dev/ad0s1b" (according to your setup) in /etc/rc.conf Reboot. >Fix: That's because /etc/rc.d/dumpon starts before /etc/rc.d/sysctl. To be fixed. ----------- --- /etc/rc.d/dumpon.orig Tue Oct 7 16:09:52 2008 +++ /etc/rc.d/dumpon Tue Oct 7 15:49:42 2008 @@ -5,6 +5,7 @@ # PROVIDE: dumpon # BEFORE: disks savecore initrandom +# REQUIRE: sysctl # KEYWORD: nojail . /etc/rc.subr ----------- After fix (dmesg -a): --- /dev/ad0s1d: clean, 417342 free (694 frags, 52081 blocks, 0.1% fragmentation) net.inet6.ip6.auto_linklocal: 1 -> 0 hw.syscons.bell: 1 -> 0 debug.minidump: 0 -> 1 kernel dumps on /dev/ad0s1b Entropy harvesting: --- >Release-Note: >Audit-Trail: >Unformatted:
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200810071216.m97CGDHm014430>