Messages in this thread | | | Date | Thu, 5 Nov 2009 14:21:09 +0100 | Subject | Re: OOM killer, page fault | From | Norbert Preining <> |
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Hi Kim, hi all,
(still please Cc)
sorry for the late reply. I have two news, one good and one bad: The good being that I can reproduce the bug by running VirtualBox with some W7 within. Anyway, I don't have a trace or better debug due to the bad news: Both 2.6.32-rc5 and 2.6.32-rc6 do *not* boot with the patch below. Don't ask me why, please, and I don't have a serial/net console so that I can tell you more, but the booting hangs badly at: [ 6.657492] usb 4-1: Product: Globetrotter HSDPA Modem [ 6.657494] usb 4-1: Manufacturer: Option N.V. [ 6.657496] usb 4-1: SerialNumber: Serial Number [ 6.657558] usb 4-1: configuration #1 chosen from 1 choice [ 6.837364] input: PS/2 Mouse as /devices/platform/i8042/serio2/input/input6 [ 6.853693] input: AlpsPS/2 ALPS GlidePoint as /devices/platform/i8042/serio2/input/input7
Normally it continues like that, but with the patch below it hangs here and does not continue. I need to Sysrq-s/u/b out of it.
[ 6.904119] usb 8-2: new full speed USB device using uhci_hcd and address 2 [ 7.075524] usb 8-2: New USB device found, idVendor=044e, idProduct=3017
> diff --git a/mm/memory.c b/mm/memory.c > index 7e91b5f..47e4b15 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -2713,7 +2713,11 @@ static int __do_fault(struct mm_struct *mm, > struct vm_area_struct *vma, > vmf.page = NULL; > > ret = vma->vm_ops->fault(vma, &vmf); > - if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE))) > + if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE))) { > + printk(KERN_DEBUG "vma->vm_ops->fault : 0x%lx\n", > vma->vm_ops->fault); > + WARN_ON(1); > + > + } > return ret; > > if (unlikely(PageHWPoison(vmf.page))) {
I know it sounds completely crazy, the patch only does harmless things afais. But I tried it. Several times. rc6+patch never did boot, while rc5 without path did boot. Then I patched it into -rc5, recompiled, and boom, no boot. booting into .31.5, recompiling rc6 and rc5 without that patch and suddenly rc6 boots (and I am sure rc5, too).
Sorry that I cannot give more infos, please let me know what else I can do.
Ah yes, I can reproduce the original strange bug with oom killer!
Best wishes
Norbert
------------------------------------------------------------------------------- Dr. Norbert Preining Associate Professor JAIST Japan Advanced Institute of Science and Technology preining@jaist.ac.jp Vienna University of Technology preining@logic.at Debian Developer (Debian TeX Task Force) preining@debian.org gpg DSA: 0x09C5B094 fp: 14DF 2E6C 0307 BE6D AD76 A9C0 D2BF 4AA3 09C5 B094 ------------------------------------------------------------------------------- MELTON CONSTABLE (n.) A patent anti-wrinkle cream which policemen wear to keep themselves looking young. --- Douglas Adams, The Meaning of Liff
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