On Tue, Oct 30, 2012 at 01:10:32AM +0100, Rafael J. Wysocki wrote: > On Sunday, October 28, 2012 12:59:49 PM Linus Torvalds wrote: > > It's been a week, time for -rc3! > > > > Nothing particularly stands out here. Lots of small fixes, exemplified > > by the series of memory leak fixes in usb serial drivers. Just a lot > > of random stuff.. > > > > Most of it is drivers (all over: drm, wireless, staging, usb, sound), > > but there's a few filesystem updates (nfs, btrfs, ext4), arch updates > > (arm, x86 and m68k) and just random stuff. Shortlog appended. > > Unfortunately, s2disk is broken with this one and previous -rc. In the > majority of cases it just hangs the machine during hibernation, although > sometimes it returns to user space reporting freezing problems, suspicions > RCU usage and similar stuff, pretty much without any useful debug information. > > I'm quite confident that v3.6 was OK (and -stable based on that too), so > it most likely is a recent regression. The in-kernel hibernation > (ie. "echo disk > /sys/power/state") works no problem. So does suspend to > RAM on my test boxes. > > So far I have been able to reproduce this 100% of the time on two machines > with Intel CPUs and graphics driven by i915. I _suspect_ that this may be > related to VT switching, because s2disk does some ugly things in that area > which are not done by the in-kernel code. Dunno.
I've had this symptom on my laptop (Thinkpad Edge 13, Intel graphics & CPU; I can get details when I get back home in about 8 hours), but only with 3.7-rc2. It was definitely working in 3.6, and seems to be OK in 3.7-rc3, although I've only tried two cycles of that last night. When I did suspend to disk, I get a blank screen (but clearly with backlight still on), and a blinking text-mode cursor in the top left. I left it for half an hour once, and nothing changed, so I'm fairly sure it was properly hung. I've not seen it return to user space with errors at all -- just the hang. > Anyway, it looks like nothing short of bisection is going to help debug this, > but I'm afraid I won't have the time to bisect within the next two weeks, so > if > anyone can reproduce this issue and will be able to bisect it, please help > (openSUSE/Tumbleweed users anyone?). I can try to bisect the 3.6 -> 3.7-rc2 failure, if that helps? But as I said, I've got it working on -rc3, so I may not have the same problem. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- UNIX: Spanish manufacturer of fire extinguishers. ---
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