[LEDE-DEV] [OpenWrt-Devel] Using kdump... persistent logs, etc.

[Philip Prindeville]

I built an x86_64 image and turned on crash logging, and then forced a crash with:

echo c >/proc/sysrq-trigger

it rebooted, but when it did there was nothing in /sys/kernel/debug/ (i.e. no crashlog file).

What am I missing?  Does this not work with x86_64?

-Philip


> On Feb 23, 2017, at 10:27 AM, Philip Prindeville <philipp_subx at redfish-solutions.com> wrote:
> 
> Thanks for that.
> 
> 
>> On Feb 22, 2017, at 11:44 PM, Syrone Wong <wong.syrone at gmail.com> wrote:
>> 
>> According to LEDE's source code:
>> 
>> config KERNEL_CRASHLOG
>> bool "Crash logging"
>> depends on !(arm || powerpc || sparc || TARGET_uml || i386 || x86_64)
>> default y
>> 
>> https://github.com/lede-project/source/blob/master/config/Config-kernel.in
>> 
>> It is enabled by default on some targets and will be available at
>> `/sys/kernel/debug/crashlog` on next boot after crash.
>> 
>> The implementation detail can be found here:
>> https://github.com/lede-project/source/blob/master/target/linux/generic/patches-4.9/930-crashlog.patch
>> 
>> 
>> Best Regards,
>> Syrone Wong
>> 
>> 
>> On Thu, Feb 23, 2017 at 10:05 AM, Philip Prindeville
>> <philipp_subx at redfish-solutions.com> wrote:
>>> Hi,
>>> 
>>> Has anyone managed to use kdump with OpenWRT/LEDE?
>>> 
>>> I have a box which periodically panics, and since /var is a link to /tmp/ there are no persistent logs.  Which reminds me: is it safe to configure a third partition on my CF card, format it as ext3, and mount that as /var/log in /etc/fstab?
>>> 
>>> And how would I modify the build process if I wanted to add additional partitions?
>>> 
>>> Thanks,
>>> 
>>> -Philip
>>> _______________________________________________
>>> openwrt-devel mailing list
>>> openwrt-devel at lists.openwrt.org
>>> https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
> 
> 
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