Re: [Xen-devel] HVM bug: system crashes after offline online a vcpu

[Wei Liu <Wei.Liu2@xxxxxxxxxx>]

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.


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