On 12/08/2010 06:19 AM, Stanislaw Gruszka wrote: > On Tue, Dec 07, 2010 at 11:24:46AM -0800, Yinghai Lu wrote: >> On 12/07/2010 02:50 AM, Stanislaw Gruszka wrote: >>> On Fri, Dec 03, 2010 at 12:54:01PM -0500, Neil Horman wrote: >>>> On Fri, Dec 03, 2010 at 06:11:48PM +0100, Stanislaw Gruszka wrote: >>>>> On Fri, Dec 03, 2010 at 06:46:09PM +0300, Maxim Uvarov wrote: >>>>>> 2010/12/3 Stanislaw Gruszka <sgruszka at redhat.com>: >>>>>>> On my T-60 laptop, i686 system with 2.6.37-rc4 kernel, >>>>>>> "echo c > /proc/sysrq-trigger" just hung the system. Kdump >>>>>>> works on 2.6.36. Is this known issue? If not, what info >>>>>>> I should provide to solve it (I think the easiest way >>>>>>> to solve the problem would be bisect) ? >>>>>>> >>>>>>> Stanislaw >>>>>>> >>>>>> >>>>>> I tested x86 QEMU yesterday with the latest git. It worked. >>>>>> Might be something target specific.., What does console print? >>>>> >>>>> Here is the photo >>>>> http://people.redhat.com/sgruszka/20101203_005.jpg >>>>> >>>>> There are two BUGs, first "sleeping function called from invalid >>>>> context" and then "unable to handle null pointer dereference". >>>>> >>>> The warning about sleeping is an artifact of the fact that we panic the box with >>>> irqs disabled I think (although I would think the fault handler would have >>>> re-enabled them properly). Not sure what the NULL pointer is from >>> >>> NULL pointer dereferece is ok, that's the way sysrq_handle_crash >>> trigger a crash. Problem here is that secondary kdump kernel hung at >>> start. >>> >>> Bisection shows that bad commit is >>> >>> commit 72d7c3b33c980843e756681fb4867dc1efd62a76 >>> Author: Yinghai Lu <yinghai at kernel.org> >>> Date: Wed Aug 25 13:39:17 2010 -0700 >> >> please check debug patches, and boot first kernel and kexec second kernel with "ignore_loglevel debug earlyprintk...." > > Second kernel does not print anything, so maybe it not even start. > Dmesg from primary kernel attached. > > Stanislaw please try attached debug patch. Thanks Yinghai -------------- next part -------------- A non-text attachment was scrubbed... Name: lmb_x86_back_9_x.patch Type: text/x-patch Size: 3229 bytes Desc: not available URL: <http://lists.infradead.org/pipermail/kexec/attachments/20101208/89adb2a9/attachment.bin>
