From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Liu Subject: Re: HVM bug: system crashes after offline online a vcpu Date: Wed, 19 Dec 2012 17:52:23 +0000 Message-ID: <1355939543.10526.30.camel@iceland> References: <1355411537.8376.52.camel@iceland> <20121219160455.GA12077@phenom.dumpdata.com> <1355936517.10526.28.camel@iceland> <20121219174000.GA28570@phenom.dumpdata.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20121219174000.GA28570@phenom.dumpdata.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Konrad Rzeszutek Wilk Cc: wei.liu2@citrix.com, "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org On Wed, 2012-12-19 at 17:40 +0000, Konrad Rzeszutek Wilk wrote: > On Wed, Dec 19, 2012 at 05:01:57PM +0000, Wei Liu wrote: > > On Wed, 2012-12-19 at 16:04 +0000, Konrad Rzeszutek Wilk wrote: > > > On Thu, Dec 13, 2012 at 03:12:17PM +0000, Wei Liu wrote: > > > > Hi Konrad > > > > > > > > I encountered a bug when trying to bring offline a cpu then online it > > > > again in HVM. As I'm not very familiar with HVM stuffs I cannot come up > > > > with a quick fix. > > > > > > I took your two patches that you posted and they are in v3.8 now. > > > > > > It seems that there are bugs in the offline/online code thought. > > > > > > I did this: > > > # echo 0 > /sys/devices/system/cpu/cpu3/online > > > # echo 1 > /sys/devices/system/cpu/cpu3/online > > > > > > With a PV guest and it blows up (with or without your patches). > > > > > > Have you seen something similar to this: > > > > > > [ 106.166795] BUG: scheduling while atomic: swapper/2/0/0x00000000 > > > [ 106.167168] microcode: CPU2 sig=0x206a7, pf=0x2, revision=0x17 > > > [ 106.167566] Modules linked in: sg sd_mod dm_multipath dm_mod xen_evtchn iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi scsi_mod libcrc32c crc32c radeon fbcon tileblit font bitblit softcursor ttm drm_kms_helper crc32c_intel xen_blkfront xen_netfront xen_fbfront fb_sys_fops sysimgblt sysfillrect syscopyarea xen_kbdfront xenfs xen_privcmd [last unloaded: dump_dma] > > > [ 106.169286] Pid: 0, comm: swapper/2 Tainted: G O 3.5.0-rc3upstream-00139-gb1849b3-dirty #1 > > > > Can you tell me which tree you're using? I cannot find cs:gb1849b3 in my > > repository. > > Oh, .. that might have been me messing around. I would just do v3.7 and > try that out. > > Just played with 3.7 several times, no oops so far. Wei.