On Wednesday 09 June 2010, Alan Jenkins wrote: > Rafael J. Wysocki wrote: > > On Tuesday 08 June 2010, Alan Jenkins wrote: > > > >> I found this bug 2.6.34 on my Asus EeePC 701 (x86_32 arch). It didn't > >> happen to me before, when I was running nearly-2.6.33 or 2.6.32-release. > >> > >> I used git-bisect, but unfortunately the result isn't very helpful. My > >> next step will be to try to narrowing down the culprits by disabling > >> individual CONFIG options. Here are my results so far, in case anyone > >> is interested. > >> > >> > >> == Steps to reproduce == > >> > >> I) Boot off mains power, with battery removed. Login to KDE4 session, > >> with Konsole as the only running application. > >> II) Run "sudo pm-hibernate" > >> > >> 1. When the system switches to text mode (a.k.a the console), > >> immediately insert the battery. > >> 2. Once the system has fully hibernated, remove the battery. > >> 3. Press the power button to resume. The backtrace below is generated > >> during resume. > >> > > > > You're not supposed to be doing that. > > > > Rafael > > > > I take it you mean "don't plug devices in during hibernation; you'll run > out of memory, Bad Things will happen, and you can expect resume to > fail". Pity. It wasn't an artificial test case, just an unusual usage > pattern of mine[1]. > > I guess it wouldn't be guaranteed safe even if I was plugging the device > in first. The battery connection could take a few seconds to stabilize, > and there's software equivalents in things like the usb-storage delay. > > I can't complain about safety margins; other people might want to do > similar things with an entire docking station... > > Any chance of a big screaming warning? It is possible, but certainly not a priority. > IIRC there's one global flag to > fail userspace call-outs while userspace is frozen. Would it be > acceptable to document this in code & behaviour by aborting the > hibernation on hot-plug? (hot-*un*plug would presumably be allowed). Ditto. Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
