Date: Thu, 1 Feb 2007 10:58:17 GMT From: Arne Woerner<arne_woerner@yahoo.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/108655: messages from kernel are mixed (/dev/klog? syslog?) Message-ID: <200702011058.l11AwH5G022108@www.freebsd.org> Resent-Message-ID: <200702011100.l11B0own083068@freefall.freebsd.org>
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>Number: 108655 >Category: kern >Synopsis: messages from kernel are mixed (/dev/klog? syslog?) >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: Thu Feb 01 11:00:49 GMT 2007 >Closed-Date: >Last-Modified: >Originator: Arne Woerner >Release: 6.2-RELEASE >Organization: >Environment: FreeBSD neo.riddick.homeunix.org 6.2-RELEASE FreeBSD 6.2-RELEASE #2: Wed Jan 17 16:56:44 UTC 2007 aw@neo.riddick.homeunix.org:/usr/src/sys/i386/compile/NEO i386 >Description: When my box (UP) comes up, many kernel messages are generated. I would guess, that they are sent to /dev/klog or so. When I look at those messages I can see, that messages, that are generated almost at the same time but by different kernel threads are mixed. I would guess, that this problem becomes worse in case of a SMP box... It looks like this: Feb 1 07:00:54 neo ad3: 238475MB <Seagate ST3250824ACE 3.ACH> at ata1-slave UDMA100GEOM_RAID5: Device sys created (id=4051465007, stripesize=131072). Feb 1 07:00:54 neo GEOM_RAID5: Disk ad0s1a attached to sys. I think, that this problem should be fixed. -Arne >How-To-Repeat: Just generate many kernel messages by different threads quickly... >Fix: Ideas: 1. by one buffer per "klog-ing thread" (organized as a hash map possibly), that is flushed in case of a newline (<LF>) or so or 2. by preparing a kernel message in a piece of memory local to the thread and then writing that message somehow atomically to klog) >Release-Note: >Audit-Trail: >Unformatted:
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