Messages in this thread | | | Date | Tue, 16 Sep 2008 12:11:49 +0400 | From | Michael Tokarev <> | Subject | PARAVIRT_GUEST bug? [was: Stable regression: usb-storage is stuck in 2.6.26.5] |
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Michael Tokarev wrote:
[usb-storage hangs on asus M2NPV-VM (nVidia GeForce 6150/nForce 430) motherboard with latest bios]
> Ok, it turned out to be pretty.. interesting. > > It's not a regression within -stable kernel series. The problem > happens when BOTH are true: > > - using latest BIOS for this mobo (1401), AND > - enabling KVM_GUEST in kernel. > > The only difference in my kernel config between .1 and .5 was > to enable KVM_GUEST and KVM_CLOCK, and also I2C_HELPER_AUTO > which was added by kernel update. > > Going with previous BIOS (1201) OR disabling PARAVIRT_GUEST > fixes the problem. I'll try to figure out which config > option is at problem here.
After seeing similar situation on another motherboard, I become curious.
Here's the result: M3A78-EM motherboard (also from Asus), AMD780G/SB700 etc. Updating to one of the latest bios makes the system unbootable. Kernel hangs on boot right after displaying
SLUB: Genslabs=12, HWalign=64, Order=0-1, MinObjects=4, CPUs=2, Nodes=1
Reverting to the older BIOS or disabling PARAVIRT_GUEST in kernel fixes this (turning off KVM_GUEST isn't enough), and kernel happily boots further, with next line being
hpet clockevent registered ...
Reportedly, another Asus motherboard (M2N-SLI DELUXE) also hangs with new BIOS and KVM_GUEST optimizations turned on, but not on older BIOS.
So it's quite.. funny. At least SOME latest BIOSes from Asustec, together with PARAVIRT_GUEST, -- a problem. Don't do either of those, and it's all ok.
The question is if Asus introduced the same bug in quite.. some of their recent BIOSes, or PARAVIRT_GUEST code is somehow buggy and the bug is exposed by new BIOS code.
Any hints on this? ;)
Thanks!
/mjt
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