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Subject: Re: seldom crashes on Dell E6330 with 12-CURRENT
To: Matthias Apitz <guru@unixarea.de>, freebsd-current@freebsd.org
References: <20160723072128.GA2136@c720-r292778-amd64>
From: Eric van Gyzen <vangyzen@FreeBSD.org>
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Date: Mon, 25 Jul 2016 10:11:23 -0500
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On 07/23/16 02:21 AM, Matthias Apitz wrote:
> 
> Hello,
> 
> I own since July 15 a new laptop and faced 3 crashes, details see below.
> What can I do to gather more information? Thanks
> 
> 
> notes in general:
> - hardware: Dell E6330, amd64, 4 cores i5-3360M, 8 GByte RAM, 250 GByte SSD w/ TRIM
> - WLAN: urtwn0: MAC/BB RTL8188CUS, RF 6052 1T1R
> - kernel: GENERIC r302904 (July 15)
> - poudriere 3.2-pre: compiling ~1800 ports in 4 builders
> - swap as plain file in /usr/swap01, 8 GByte
> - apart of the crashes below, no crash during buildworld, buildkernel and
>   ~48 hours of poudriere fetching distfiles and making ~1800 ports
> - no errors on 'memtest 1G'
> 
> crashes/observations:
> 
> 16.07.2016 07:12 
> - on shutdown swap device (plain file in /usr) could not be detached
> - drop to kdb
> - nothing in /var/log/messages
> 
> 17.07.2016 19:41
> - hard locked, had to power-off
> - last command issued on console (no X11): cp -p * /usr/PKGDIR (around 1700 files, 2 GByte)
> - nothing in /var/log/messages
> 
> 20.07.2016 19:27
> - hard locked, had to power-off
> - last command issued in xterm: fgrep mra... ~/*
> - nothing in /var/log/messages

What file system are you using?

Do a full fsck (or zfs scrub).

Try moving swap to a raw (freebsd-swap) partition so that you might get
a kernel core dump.  That will be the essential next step.

Without more details from a core dump or debugger, your best option is
to try a release or an older build.  If that works, try to find the
commit that introduced the behavior.  This will be very tedious and
time-consuming for your scenario, so definitely try getting a core dump
first.

Eric