From: Wei Liu <Wei.Liu2@citrix.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: wei.liu2@citrix.com, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: HVM bug: system crashes after offline online a vcpu
Date: Thu, 20 Dec 2012 17:48:21 +0000 [thread overview]
Message-ID: <1356025701.24056.3.camel@iceland> (raw)
In-Reply-To: <20121219192405.GA24729@phenom.dumpdata.com>
On Wed, 2012-12-19 at 19:24 +0000, Konrad Rzeszutek Wilk wrote:
> #
> #
> # # echo 0 > /sys/devices/system/cpu/cpu3/online^[[J^[[44Decho 0\b > /sys/devices/system/cpu/cpu3/online ^[[39D1 > /sys/devices/system/cpu/cpu3/online^[[38D > /sys/devices/system/cpu/cpu3/online
> [ 73.324141] installing Xen timer for CPU 3
> [ 73.324236] cpu 3 spinlock event irqc_intel fbcon scsi_mod tileblit font bitblit softcursor atl1c drm_kms_helper video xen_blkfront xen_netfront fb_sys_fops sysimgblt sysfillrect syscopyarea xenfs xen_privcmd mperf
> [ 73.325026] Pid: 0, comm: swapper/3 Not tainted 3.7.0upstream #1
> [ 73.325033] Call Trace:
> [ 73.325047] [<ffffffff810c2d1d>] __schedule_bug+0x4d/0x60
> [ 73.325058] [<ffffffff816359e2>] __schedule+0x6b2/0x7c0
> [ 73.325074] [<ffffffff81043d5d>] ? xen_force_evtchn_callback+0xd/0x10
> [ 73.325086] [<ffffffff81635bb4>] schedule+0x24/0x70
> [ 73.325097] [<ffffffff81056de9>] cpu_idle+0xc9/0xe0
> [ 73.325112] [<ffffffff810445b9>] ? xen_irq_enable_direct_reloc+0x4/0x4
> [ 73.325116] BUG: unable to handle kernel NULL pointer dereference[ 73.325122] [<ffffffff8162572b>] cpu_bringup_and_idle+0xe/0x10
>
The thread is a bit off-topic now since we're talking about PV at the
moment...
Please see cs 41bd956de3dfdc3a43708fe2e0c8096c69064a1e, it seems that
the imbalance still exists with CONFIG_PREEMPT_COUNT=y.
And I didn't manage to reproduce the NULL pointer deference.
Wei.
prev parent reply other threads:[~2012-12-20 17:48 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-13 15:12 HVM bug: system crashes after offline online a vcpu Wei Liu
2012-12-19 16:04 ` Konrad Rzeszutek Wilk
2012-12-19 16:18 ` Wei Liu
2012-12-19 17:01 ` Wei Liu
2012-12-19 17:40 ` Konrad Rzeszutek Wilk
2012-12-19 17:52 ` Wei Liu
2012-12-19 19:24 ` Konrad Rzeszutek Wilk
2012-12-20 17:48 ` Wei Liu [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1356025701.24056.3.camel@iceland \
--to=wei.liu2@citrix.com \
--cc=konrad.wilk@oracle.com \
--cc=xen-devel@lists.xen.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).