Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: Warning in during hotplug on 2.6.27-rc2-git5 | Date | Sat, 16 Aug 2008 23:34:12 +0200 |
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On Saturday, 16 of August 2008, Greg KH wrote: > On Sat, Aug 16, 2008 at 09:28:24PM +0200, Rafael J. Wysocki wrote: > > On Thursday, 14 of August 2008, Langsdorf, Mark wrote: > > > > On Thu, Aug 14, 2008 at 05:53:57PM +0200, Rafael J. Wysocki wrote: > > > > > On Wednesday, 13 of August 2008, Mark Langsdorf wrote: > > > > > > I'm seeing the following error message when I hotunplug and replug > > > > > > a cpu in 2.6.27-rc2-git5. The system becomes unstable almost > > > > > > immediately afterwards. > > > > > > > > > > Hm, it seems that MCE is involved somehow. Andi, can you > > > > have a look at this, > > > > > please? > > > > > > > > FWIW the mce code here actually hasn't changed for a long time. > > > > > > > > > > > > > > ------------[ cut here ]------------ > > > > > > WARNING: at fs/sysfs/dir.c:463 sysfs_add_one+0x33/0x39() > > > > > > sysfs: duplicate filename 'machinecheck4' can not be created > > > > > > > > The only way I could see that happening if CPU_DEAD/CPU_ONLINE > > > > is not properly balanced. > > > > > > I'm still seeing it on 2.6.27-rc2, even with the > > > patch here http://lkml.org/lkml/2008/7/30/171 and the > > > wbinvd_halt code patch applied. Maybe something else > > > broke in some of the recent hotplug changes? > > > > My guess is that MCE does somthing that is not allowed by sysfs any more. > > Hm, sysfs hasn't changed any in 2.6.27-rcX that I know of.
Hmm. Mark, what kind of a system is this? Is it a 2 quad-core CPU system or similar ('machinecheck4' in your trace seems to imply something like this)?
Rafael
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